WorldWideScience

Sample records for ambiente estuarial rasgos

  1. Rasgos a grandes rasgos: aspectos generales de las experiencias de comunicación y desarrollo sobre medio ambiente en la región Andina de Colombia

    Directory of Open Access Journals (Sweden)

    Eliana Herrera Huérfano

    2010-01-01

    Full Text Available Este artículo propone una caracterización de las experiencias de comunicación y desarrollo sobre medio ambiente en la región Andina de Colombia, a partir de la identificación que se logró mediante un proceso de mapeo en el marco de la investigación interinstitucional del mismo nombre. Inicialmente se presenta un preámbulo de orden metodológico que da cuenta del proceso de recolección y sistematización de la información, seguido de una tipificación a partir del análisis e interpretación de los resultados, para concluir con una reflexión prospectiva sobre la segunda etapa de este proyecto.

  2. rasgos funcionales

    Directory of Open Access Journals (Sweden)

    J.P. González-Varo

    2015-01-01

    Full Text Available Muchas especies de mamíferos carnívoros (Orden Carnivora consumen frutos carnosos, transportan semillas en sus tractos digestivos y las defecansin dañarlas en condiciones apropiadas para la germinación. En este artículo, revisamos el conocimiento adquirido sobre este mutualismo en lasúltimas tres décadas, desde que tres trabajos pioneros revelaron la importancia de los carnívoros como dispersores de semillas en ecosistemastemplados. Nos centramos en los rasgos funcionales de los carnívoros consumiendo frutos y diseminando semillas, haciendo especial énfasis ensus diferencias con las aves, el principal grupo de vertebrados frugívoros en ecosistemas templados. Los carnívoros no están sujetos a las restriccionesfenológicas o morfológicas que típicamente limitan el consumo de determinados frutos en muchas especies de aves. Consumen preferentementefrutos cuyos atributos son compartidos con muchas especies de frutos cultivados por el hombre, lo que explica el consumo frecuente deéstos en paisajes antrópicos. Sus amplios requerimientos espaciales favorecen la dispersión de semillas a larga distancia, mientras que su generalismoen relación al hábitat favorece el flujo de semillas entre hábitats contrastados. De este modo, los carnívoros promueven la conectividadentre poblaciones vegetales y la colonización. Estas funciones ecológicas son clave para las comunidades vegetales nativas, especialmente en escenariosde cambios de uso de suelo. Sin embargo, estos patrones de dispersión de semillas pueden contribuir a la invasión de plantas exóticas.Aún ignoramos en gran medida el papel de los carnívoros en términos cuantitativos de la dispersión de semillas y las diferencias funcionales entreespecies dentro del gremio. La integración de muestreos clásicos e innovadoras técnicas moleculares y de análisis espacial promete aportar conocimientoinédito en estas cuestiones.

  3. Rasgos postmodernos de la educación ambiental. Una formación pertinente con las nuevas corrientes de pensamiento

    Directory of Open Access Journals (Sweden)

    Francisco Javier Perez Rodriguez

    2015-02-01

    Full Text Available Los problemas ambientales que se suscitan a escala global son evidencia de una crisis, la cual es expresión de una coyuntura más profunda que trastoca los fundamentos del pensamiento de la humanidad en toda una era. Esta situación tiene sus causas primigenias en el modo general de conocer que desde el Renacimiento se implantó en gran parte del mundo occidental y que erigió al desarrollo y al progreso como idearios, hecho que finalmente se tradujo en una relación insostenible entre los humanos y la naturaleza. Esto expone la necesidad que desde las canteras de la educación se dé apertura a una formación ambiental cónsona con las nuevas corrientes de pensamiento. Es por ello que este ensayo pretende esgrimir los rasgos postmodernos de la Educación Ambiental como proceso pedagógico formal y no escolarizado en los planos epistemológicos, ontológicos y axiológicos, estableciendo la pertinencia del estudio de los problemas ambientales a partir de la crítica a los logos de la ciencia clásica, dando a su vez apertura a la concatenación de ideas y tópicos para la generación de un pensamiento complejo, un conocimiento interdisciplinario y saberes con grandes cimientos éticos que garanticen el cumplimiento de los propósitos de la Educación Ambiental.

  4. La comprensión de las organizaciones empresariales y su ambiente como sistemas de complejidad creciente: rasgos e implicaciones

    OpenAIRE

    Luz Esperanza Bohórquez

    2016-01-01

    Contexto: la complejidad creciente de las organizaciones empresariales, y del entorno en el que actúan, ha llevado a que la corriente de pensamiento dominante para la comprensión de las organizaciones se torne insuficiente para dar respuesta a las condiciones cambiantes, y a la vez genere lentitud, inflexibilidad y fragilidad en la toma de decisiones, así como externalidades negativas tanto en el medio ambiente como en la sociedad. Una corriente alternativa con fundamento en las ciencias de l...

  5. RASGOS DE PERSONALIDAD EN PACIENTES CON OBESIDAD

    Directory of Open Access Journals (Sweden)

    Alejandra Bravo Del Toro

    2011-01-01

    Full Text Available El presente estudio analizó los rasgos de personalidad con mayor incidencia en una población mexicana con obesidad. Se distinguieron los rasgos que intervienen en el funcionamiento diario de los sujetos. La muestra estuvo conformada por 60 pacientes: 31 hombres y 29 mujeres, con edades de 30 a 40 años, casados, con nivel educativo básico y que acudían a consulta médica en un centro de diagnóstico clínico, con antecedentes de obesidad. Se utilizó el perfil-inventario de la personalidad de Gordon, según el cual se comprobó que los pacientes con obesidad tienden a mostrar rasgos de personalidad por debajo de la norma. Los análisis demostraron relaciones significativas entre la gente obesa y cada uno de los rasgos de personalidad con menor prevalencia que mide la escala.

  6. Rasgos culturales y desarrollo de las PYMES

    Directory of Open Access Journals (Sweden)

    José Luis Rocha

    1999-09-01

    Full Text Available El hecho de que la fluidez de la información, la confianza y la gobernabilidad sean difícilmente calculables y que no puedan por tanto ser incluidas entre las variables de los modelos econométricos, les ha marginado de los análisis económicos. Según el economista italiano Andrea Saba, el excluir esos rasgos de los estudios económicos es un error gravísimo que difunde una forma de falsa cultura economicista que pretende explicar el complejo fenómeno del desarrollo con base únicamente en variables de naturaleza económica que permitan un tratamiento modelístico (Saba, 1997:31-32. Este artículo se ocupa de otro tipo de variables, como son los rasgos culturales, para reseñar de manera sucinta su impacto sobre el desarrollo de las PYMES. Aborda algunos rasgos culturales que han sido tenidos como adversos. Pero la tesis esencial es que los rasgos culturales, calificados como adversos o no, o en ocasiones tenidos como elementos folklóricos improductivos, pueden ser transformados en recursos económicos mediante innovaciones empresariales.

  7. ambiental

    Directory of Open Access Journals (Sweden)

    Roque Leal Salcedo

    2008-01-01

    Full Text Available El derecho internacional ambiental es un conocimiento de carácter transversal, que entre otras consideraciones refleja las preocupaciones de la sociedad por la implementación de un modelo de desarrollo sustentable para el respeto a las reglas del medio natural que garantizan la integridad y renovación de los sistemas naturales. El presente artículo enfoca esta visión a través del análisis de material documental revisado, entre ellos tratados internacionales que permiten distinguir el desarrollo del derecho internacional ambiental y el papel de Organización de las Naciones Unidas (ONU, en el propósito común del derecho individual y colectivo de disfrutar de una vida, un ambiente seguro, sano y ecológicamente equilibrado. En función a estas disertaciones las consideraciones finales exponen parte de la visión que ha estructurado la ONU y que representan un aporte considerable en el fomento de la conciencia mundial sobre la necesidad de establecer vínculos entre las naciones para el continuo desarrollo de esta rama del derecho.

  8. Distimia: estudio descriptivo y rasgos de personalidad.

    OpenAIRE

    Sergio Ocio León; Graciano Fernández García

    1994-01-01

    Se exponen los resultados de una investigación sobre una muestra de pacientes distímicos, diagnosticados siguiendo criterios CIE-10, Ya los que se realizó la sección E (Depresión) de la CIDI Medular (primera versión autorizada de la Entrevista Diagnóstica Compuesta). Los datos en que se ha centrado el estudio son: sociodemografía, antecedentes de trastorno psiquiátrico, características clínicas y rasgos de personalidad (según el cuestionario de personalidad 16-PF). Los resultados nos acercaro...

  9. Distimia: estudio descriptivo y rasgos de personalidad.

    Directory of Open Access Journals (Sweden)

    Sergio Ocio León

    1994-01-01

    Full Text Available Se exponen los resultados de una investigación sobre una muestra de pacientes distímicos, diagnosticados siguiendo criterios CIE-10, Ya los que se realizó la sección E (Depresión de la CIDI Medular (primera versión autorizada de la Entrevista Diagnóstica Compuesta. Los datos en que se ha centrado el estudio son: sociodemografía, antecedentes de trastorno psiquiátrico, características clínicas y rasgos de personalidad (según el cuestionario de personalidad 16-PF. Los resultados nos acercaron al conocimiento del trastorno distímico, así como al manejo de la CIE-10. Destaca el carácter objetivamente moderado de la sintomatología distímica, su frecuente asociación a lo largo de la evolución con otro trastorno depresivo, y la existencia de unos rasgos de personalidad predominantes en este tipo de pacientes

  10. The discrepancy in concentration of metals (Cu, Pb and Zn) in oyster tissue (Saccostrea glomerata) and ambient bottom sediment (Sydney estuary, Australia).

    Science.gov (United States)

    Birch, G F; Melwani, A; Lee, J-H; Apostolatos, C

    2014-03-15

    The current study aimed to examine the relationship between metals in sediments and metal bioaccumulation in oyster tissue in a highly-modified estuary (Sydney estuary, Australia). While extensive metal contamination was observed in surficial sediments, suspended particulate matter and oyster tissue, a significant relationship between these media could not be established. No relationship was determined between sediment quality guidelines and oyster size or weight, nor with human consumption levels for metals in oyster tissue. Moreover, oyster tissue metal concentrations varied greatly at a single locality over temporal scales of years. Oyster tissue at all 19 study sites exceeded consumptions levels for Cu. Bioaccumulation of metals in oyster tissue is a useful dynamic indicator of anthropogenic influence within estuaries, however oysters cannot be used in Sydney estuary as a valid biomonitor due to overriding internal regulation (homoestasis) by the animal, or by external natural (sediment resuspension) and anthropogenic (sewer/stormwater discharges) pressures, or both.

  11. Cuestionario de rasgos de personalidad obsesiva (CRPO): resultados preliminares

    OpenAIRE

    Vallejo Ruiloba, Julio; Marcos, Teodor; Salamero, Manel

    1996-01-01

    Se presentan los resultados preliminares del cuestionario de rasgos de personalidad obsesiva (CRPO) en tres muestras de población (pacientes obsesivos, pacientes depresivos con melancolía y controles sanos). cuestionario, de 31 ítems, ha demostrado ser útil y válido para discriminar el trastorno obsesivo-compulsivo personalidad.

  12. Trazos de método para detectar los rasgos institucionales en académicos de universidades públicas mexicanas ante los estímulos federales

    OpenAIRE

    Rosalía S. Lastra B.; Domingo Herrera G.

    2008-01-01

    El contenido del presente artículo esboza los rasgos más generales detectados como subyacentes en el ambiente universitario mexicano en torno al sistema público de evaluación y estímulos federales a académicos. Dichos rasgos se presentan a partir de la depuración de información que resultó relevante en la revisión sociohistórica de la educación superior, apoyados en el enfoque del Nuevo Institucionalismo Sociológico (NIS). A continuación se establecen las preguntas esenciales que resultaron s...

  13. Rasgos comunes entre el poder punitivo y el poder patriarcal

    Directory of Open Access Journals (Sweden)

    Diana Restrepo Rodríguez

    2016-01-01

    Full Text Available El poder punitivo manifestado especialmente en la existencia y el uso de las prisiones, pero expresión también del castigo en general (en la relación consigo misma y las demás personas, en la familia, la escuela, las empresas, etc., se encuentra en una íntima relación con el patriarcado: surge de él y para él. Al ser analizado minuciosamente revela también muchas características propias del sistema de opresión patriarcal, el cual es universal y se encuentra en toda la historia conocida de la humanidad. La prisión como eje simbólico, así como todo el complejo entramado de lo que denominamos justicia penal, se entienden mejor en relación con los elementos que conforman el patriarcado, así mismo, este último se puede comprender más a fondo analizando la lógica del castigo. Estos son los temas que se tratan en este texto, que buscan integrar las visiones que ofrecen el abolicionismo y el feminismo, las cuales concluyen que es necesario un cambio cultural general, civilizatorio. En ese sentido, el artículo expone, luego de una breve introducción, por qué el poder punitivo es un poder patriarcal, posteriormente se profundiza en tal tesis a partir de la exposición de seis rasgos comunes: 1 el desprecio por la vida, 2 la generación de siervas (víctimas, incapaces, infantilizadas, 3 la utilización amañada de las ciencias, 4 el interés en la ruptura de los lazos de solidaridad, 5 el fundamento en la lógica dualista y 6 la relación entre el concepto “culpa de la punición” y el concepto “eres mía” del patriarcado. Finalmente se esbozan algunas conclusiones, en las que se recalca la necesidad de un cambio cultural que renuncie al castigo, eliminando también el patriarcado y, se llama a las mujeres a jalonar tales transformaciones, no sin antes lanzar algunas ideas para avanzar en ese camino.

  14. Computation of dilution discharge and mean concentration of effluents in Beypore Estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    DineshKumar, P.K.; Josanto, V.; Sankaranarayanan, V.N.

    Tide dominated Beypore estuary along the west coast of India was studied to estimate the mean flow available for diluting the conservative effluents based on the distribution of ambient salinity as a guide through one dimensional analysis...

  15. Prediction in Ungauged Estuaries

    NARCIS (Netherlands)

    Gisen, J.I.A.

    2015-01-01

    Estuaries have been used for settlement by humans since 5000-9000 years ago [Day et al., 2012]. The calm environment and nutrient-rich soil encouraged the development of ports and agriculture. Over-development however has put estuaries in unhealthy condition, where the water is polluted (excessive n

  16. Estuary Classification Revisited

    CERN Document Server

    Guha, Anirban

    2012-01-01

    The governing equations of a tidally averaged, width averaged, rectangular estuary has been investigated. It's theoretically shown that the dynamics of an estuary is entirely controlled by three parameters: (i) the Estuarine Froude number, (ii) the Tidal Froude number and (iii) the Estuarine Aspect ratio. The momentum, salinity and integral salt balance equations can be completely expressed in terms of these control variables. The estuary classification problem has also been reinvestigated. It's found that these three control variables can completely specify the estuary type. Comparison with real estuary data shows very good match. Additionally, we show that the well accepted leading order estuarine integral salt balance equation is inconsitent with the leading order salinity equation in an order of magnitude sense.

  17. Rasgos del temperamento de los perros domésticos (Canis familiaris: evaluaciones conductuales

    Directory of Open Access Journals (Sweden)

    ADRIANA JAKOVCEVIC

    2009-01-01

    Full Text Available Los rasgos del temperamento se definen como tendencias conductuales estables entre situaciones similares y a lo largo del tiempo. En el presente trabajo se revisan las pruebas conductuales diseñadas para la evaluación de rasgos aislados del temperamento en los perros domésticos. Para cada dimensión se describen los estímulos empleados, las respuestas evaluadas y el correlato psiológico de las mismas. Los rasgos más estudiados fueron la temerosidad, la agresividad y la sociabilidad. Sin embargo, sólo la primera cuenta con correlatos psiológicos bien establecidos. Finalmente, las evaluaciones conductuales resultan de suma importancia para la selección de los perros para las distintas funciones que cumplen en la sociedad humana: detección de drogas, compañía, guardia, rescate de personas, etc.

  18. Rasgos funcionales y plasticidad fenotípica de plantas exóticas invasoras

    OpenAIRE

    Godoy del Olmo, Óscar

    2009-01-01

    Premio Extraordinario de Doctorado 2012 Esta Tesis Doctoral se centra en el estudio de los rasgos funcionales y la plasticidad fenotípica que se asocian con el potencial invasor de las plantas exóticas y sus impactos sobre los ecosistemas mediterráneos. Los objetivos principales fueron: i) buscar diferencias de fenotipo entre especies invasoras y nativas para un amplio grupo de rasgos morfológicos y fisiológicos, ii) determinar si una elevada plasticidad fenotípica se asocia con el potenci...

  19. El docente investigador: su génesis teórica y sus rasgos

    Directory of Open Access Journals (Sweden)

    Natalia Campos Saborío

    2003-01-01

    Full Text Available El propósito de este artículo es enunciar los rasgos que caracterizan al docente investigador. Para ello, me ubico en el contexto teórico, desde dónde conceptualizo sus calidades, a saber: visión de mundo, de paradigma curricular, y de investigación educativa

  20. Bibliography on Alaska estuaries

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This bibliography was compiled to assist in working up “profiles” for the estuaries in Alaska. The purpose of the profiles is to list in a narrative form the...

  1. Penobscot Estuary (Maine) Monitoring

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's NEFSC collects fisheries data from the Penobscot Estuary using several types of fishing gear. The data is used to determine species presence, relative...

  2. Rasgos de personalidad y autoestima en víctimas de acoso laboral

    Directory of Open Access Journals (Sweden)

    John Alcides Camargo

    2010-01-01

    Full Text Available La investigación describe las conductas de acoso psicológico laboral, rasgos de personalidad y autoestima de personas que han denunciado acoso laboral ante instancias legales. Participaron cuatro mujeres, entre 45 y 57 años de edad, con tiempo de vinculación mayor a 15 años en organizaciones públicas. Se aplicó el cuestionario Lipt-60, la prueba BFQ, la escala de autoestima de Rosenberg y una entrevista semiestructurada. Los resultados reflejan la presencia de acoso psicológico laboral vertical descendente, cada caso es diferente al no presentar semejanzas en las acciones hostigadoras percibidas y difieren en la intensidad y frecuencia de las estrategias utilizadas por el acosador hacia la víctima. En los rasgos de personalidad todos los casos presentan puntuaciones bajas en afabilidad y estabilidad emocional

  3. La influencia de los rasgos psicológicos en las actitudes hacia el empleo

    Directory of Open Access Journals (Sweden)

    Antonia Mercedes García Cabrera

    2008-01-01

    Full Text Available Esta investigación explica la influencia que el rasgo psicológico locus de control, conjuntamente con las variables que definen el capital humano de un país -género, edad y educación-, ejercen sobre las actitudes hacia el empleo en la República de Cabo Verde. De entre estos rasgos demográficos del individuo, el género es analizado más profundamente debido al interés actual por reducir las desigualdades en razón de género en el mercado laboral. Los 448 cuestionarios recabados muestran que, en este país, los atributos demográficos edad y nivel de estudios, así como el rasgo de personalidad locus de control, son importantes determinantes de las actitudes hacia el empleo de la población activa. Los resultados ofrecen las bases sobre las que redirigir las políticas de empleo en Cabo Verde para afrontar los puntos débiles que limitan el desarrollo del mercado de trabajo y amenazan la integración social.

  4. Ambient Space and Ambient Sensation

    DEFF Research Database (Denmark)

    Schmidt, Ulrik

    The ambient is the aesthetic production of the sensation of being surrounded. As a concept, 'ambient' is mostly used in relation to the music genre 'ambient music' and Brian Eno's idea of environmental background music. However, the production of ambient sensations must be regarded as a central...... aspect of the aesthetization of modern culture in general, from architecture, transport and urbanized lifeforms to film, sound art, installation art and digital environments. This presentation will discuss the key aspects of ambient aesthetization, including issues such as objectlessness...

  5. EPISTEMOLOGIA AMBIENTAL

    OpenAIRE

    2012-01-01

    O livro Epistemologia Ambiental traz uma rica discussão sobre a questão ambiental, abordando teorias relevantes para o entendimento e interpretação da crise atual, orientando para a construção de novas racionalidades e a constituição de um saber ambiental. A obra vem compartimentada em cinco capítulos distribuídos em 240 páginas. 

  6. La comprensión de las organizaciones empresariales y su ambiente como sistemas de complejidad creciente: rasgos e implicaciones

    Directory of Open Access Journals (Sweden)

    Luz Esperanza Bohórquez

    2016-10-01

    Método: en el documento se revisan las características de los sistemas de complejidad creciente y se identifican los elementos que explican su capacidad de auto-organización. A partir de esta revisión se plantean las implicaciones de comprender a las organizaciones como sistemas de complejidad creciente, las cuales se articulan con recientes investigaciones que en ingeniería organizacional y gestión buscan incrementar la capacidad de adaptación del sistema. Resultados: se desarrolla una apreciación sobre las implicaciones en la ingeniería organizacional de diseñar organizaciones empresariales con mayor capacidad para auto-organizarse y de manera amplia de aprovechar la complejidad creciente del entorno. Conclusiones: la comprensión de las organizaciones empresariales como sistemas de complejidad creciente ofrece una perspectiva notoriamente distinta al paradigma tradicional el cual se han caracterizado por el enfoque reduccionista. A la fecha la investigación al respecto se encuentra en etapas tempranas y no existen modelos o evidencias empíricas que permitan corroborar de manera amplia y completa la fuerza de tales ideas. Sin embargo, los altos niveles de agilidad, flexibilidad y robustez que exhiben los sistemas auto-organizados permiten proyectar importantes campos de investigación alrededor del diseño de estructuras organizacionales flexibles, formas de gobernanza, toma decisiones en ausencia de controlador central, etc.

  7. Det ambiente

    DEFF Research Database (Denmark)

    Schmidt, Ulrik

    Om begrebet "det ambiente", der beskriver, hvad der sker, når vi fornemmer baggrundsmusikkens diskrete beats, betragter udsigten gennem panoramavinduet eller tager 3D-brillerne på og læner os tilbage i biografsædet. Bogen analyserer, hvorfan ambiente oplevelser skabes, og hvilke konsekvenser det...

  8. Ambient Sensors

    NARCIS (Netherlands)

    Börner, Dirk; Specht, Marcus

    2014-01-01

    This software sketches comprise two custom-built ambient sensors, i.e. a noise and a movement sensor. Both sensors measure an ambient value and process the values to a color gradient (green > yellow > red). The sensors were built using the Processing 1.5.1 development environment. Available under th

  9. Derecho Ambiental

    OpenAIRE

    2014-01-01

    Es indudable la relevancia para la vida del planeta proteger el ambiente. De ahí que a lo largo de las últimas decadas el derecho ambiental se ha consolidado como una nueva y vital rama del derecho público.

  10. RASGOS DEL TEMPERAMENTO DE LOS PERROS DOMÉSTICOS (CANIS FAMILIARIS: EVALUACIONES CONDUCTUALES

    Directory of Open Access Journals (Sweden)

    ADRIANA JAKOVCEVIC

    2009-08-01

    Full Text Available

    Los rasgos del temperamento se definen como tendencias conductuales estables entre situaciones similares y a lo largo del tiempo. En el presente trabajo se revisan las pruebas conductuales diseñadas para la evaluación de rasgos aislados del temperamento en los perros domésticos. Para cada dimensión se describen los estímulos empleados, las respuestas evaluadas y el correlato fisiológico de las mismas. Los rasgos más estudiados fueron la temerosidad, la agresividad y la sociabilidad. Sin embargo, sólo la primera cuenta con correlatos fisiológicos bien establecidos. Finalmente, las evaluaciones conductuales resultan de suma importancia para la selección de los perros para las distintas funciones que cumplen en la sociedad humana: detección de drogas, compañía, guardia, rescate de personas, etc.

  11. Explorando los rasgos de personalidad en adolescentes que manifiestan conductas problemáticas

    OpenAIRE

    Molina Martín, Susana; Inda Caro, Mª de las Mercedes; Fernández García, Carmen María

    2009-01-01

    El objetivo de esta investigación es doble. En primer lugar, estudiamos la adecuación de los datos al modelo de cinco factores, y, en segundo lugar, identificamos los rasgos de personalidad que manifiestan aquellos adolescentes que dicen tener ciertas problemáticas en su vida cotidiana. Para ello utilizamos dos instrumentos de evaluación: el Cuestionario de Personalidad para Adolescentes (16PF-APQ ) y el Cuestionario Autoaplicado de Síntomas que elaboramos a pa...

  12. Rasgos de personalidad y autoestima en víctimas de acoso laboral

    OpenAIRE

    John Alcides Camargo; Alexandra Puentes Suárez

    2010-01-01

    La investigación describe las conductas de acoso psicológico laboral, rasgos de personalidad y autoestima de personas que han denunciado acoso laboral ante instancias legales. Participaron cuatro mujeres, entre 45 y 57 años de edad, con tiempo de vinculación mayor a 15 años en organizaciones públicas. Se aplicó el cuestionario Lipt-60, la prueba BFQ, la escala de autoestima de Rosenberg y una entrevista semiestructurada. Los resultados reflejan la presencia de acoso psicológico laboral vertic...

  13. Rasgos psicológicos y percepción del dolor en pacientes con fibromalgia

    OpenAIRE

    2016-01-01

    La fibromialgia es un sindrome complejo que lleva asociado diferentes síntomas. Esta patología se caracteriza por dolor generalizado y persistente, mayor sentsibilidad al dolor y otros síntomas, como fatiga, sueño no reparador, y alteraciones del estado de ánimo.El objeto de este estudio es conocer la posible relación existente entre diferentes rasgos psicológicos y la percepción de dolor en general, interesándose particularmente aquellas personas con fibromialgia, y también la capacidad de e...

  14. Especies leñosas nativas claves para la restauración ecológica del Embalse de Chisacá, Colombia, con base en rasgos importantes de su historia de vida

    Directory of Open Access Journals (Sweden)

    Rodríguez Ramírez Natalia

    2006-12-01

    Full Text Available Se determinaron cinco especies nativas leñosas, como claves para la restauración de plantaciones de Pinus patula
    y Corredor ripario potrerizado del embalse de Chisacá (localidad de Usme, Bogotá, Colombia 3.000-3.250
    msnm; 4°08’59’’ N; 74°17’62’’ W, con base en Rasgos de de Historia de Vida (RHV y otras características de
    especies presentes en estas áreas. Teniendo en cuenta el objetivo del estudio y las características de las áreas
    degradadas se seleccionaron y analizaron 23 rasgos a cada una de las especies evaluadas en los distintos ambientes. En la zona de pinos se estudiaron 23 especies, 21 en el corredor ripario potrerizado y 20 en el Matorral Bajo. Se estableció un sistema de calificación para las posibles respuestas de cada uno de los rasgos según su incidencia en la restauración ecológica de las áreas a restaurar. Posteriormente, se calificaron los resultados de los rasgos de cada una de las especies y se calculó una calificación final de éstas. Se recomiendan como especies claves para la restauración las cinco especies que obtuvieron mayor calificación final. Teniendo en cuenta lo anterior se recomiendan como especies claves para la restauración de la zona de pinos las especies Hesperomeles goudotiana (72,41%, Vallea stipularis (67,82%, Symplocos s theiformis (67,82%, Holodiscus argenteus (65,52%, y Myrcianthes leucoxyla (65,52% y para el corredor ripario potrerizado las especies Hesperomeles goudotiana (75,86%, Brugmansia sanguinea (74,71%, Myrcianthes leucoxyla (68,97%, Berberis goudotii (65,48% y Vallea stipularis (64,37%. La selección de especies claves para la restauración con base en RHV parece ser una metodología adecuada, siempre y cuando la selección de rasgos se haga cuidadosamente, teniendo en cuenta
    los objetivos del estudio y que las especies consideradas se estudien en cada ambiente donde se desarrollen. En
    efecto, se observó que los rasgos responden de

  15. Mangroves and estuaries

    OpenAIRE

    2001-01-01

    Mangroves are forests of salt-tolerant trees and shrubs that grow in the shallow tidal waters of estuaries and coastal areas in tropical regions. They require slow currents, no frost and plenty of fine sediment in which to set their roots. Their muddy waters, rich in nutrients from decaying leaves and wood, are home to sponges, worms, crustaceans, molluscs and algae, and provide shelter for marine mammals, snakes and crocodiles. They act as fish nurseries and help feed life fur...

  16. Det Ambiente

    DEFF Research Database (Denmark)

    Schmidt, Ulrik

    Det ambiente er iscenesættelsen af en karakteristisk sanseoplevelse, der er kendetegnet ved fornemmelsen af at være omgivet. I dag bliver begrebet om det ambiente mest anvendt i forbindelse med musikgenren ’ambient musik’. Det ambiente er dog ikke essentielt knyttet til det musikalske, men må...... forstås som et betydeligt bredere fænomen i den moderne æstetiske kultur, der spiller en væsentlig rolle i oplevelsen af moderne transportformer, arkitektur, film, lydkunst, installationskunst og digitale multimedieiscenesættelser. En forståelse af det ambiente er derfor centralt for forståelsen af en...... moderne æstetiseret oplevelseskultur i almindelighed. Da det ambiente ikke hidtil har været gjort til genstand for en mere indgående teoretisk behandling, er der dog stor usikkerhed omkring, hvad fænomenet overhovedet indebærer. Hovedformålet med Det ambiente – Sansning, medialisering, omgivelse er derfor...

  17. RELACIÓN ENTRE LOS RASGOS DE PERSONALIDAD Y NIVELES DE AGRESIVIDAD EN ALUMNOS DE LA ESCUELA TÉCNICO SUPERIOR PNP CHARCANI - AREQUIPA 2015

    OpenAIRE

    RODAS MÁLAGA, MILAGROS FRANCIS

    2016-01-01

    RASGOS DE PERSONALIDAD METAS MOTIVACIONALES MODOS COGNITIVOS COMPORTAMIENTOS INTERPERSONALES AGRESIVIDAD ORIGEN DE LA AGRESIVIDAD TEORÍAS?SOBRE?LA?AGRESIVIDAD COMPONENTES DE LA AGRESIVIDAD ANTECEDENTES INVESTIGATIVOS RESULTADOS

  18. RASGOS DE PERSONALIDAD, INTELIGENCIA Y RENDIMIENTO ACADÉMICO EN ESTUDIANTES DE LA CARRERA DE MÉDICO CIRUJANO

    OpenAIRE

    R Sánchez de Tagle-Herrera; L Osornio-Castillo; S Valadez-Nava; L Heshiki-Nakandakari; L García-Monroy; ZY Zárate-Gutiérrez

    2010-01-01

    Objetivo: Identificar los rasgos de personalidad e inteligencia asociados al rendimiento académico en estudiantes de la carrera de médico cirujano. Material y Métodos: Se conformó una muestra aleatoria con 230 estudiantes de la generación 2007, a quienes se dividieron en estudiantes regulares y estudiantes no regulares, según su situación académica. Los rasgos de personalidad se midieron a través de los 16 factores que plantea Cattell y para el cociente de inteligencia (CI) se utilizó el Test...

  19. Validación del Inventario de Ansiedad Rasgo-Estado para Niños en adolescentes cubanos

    OpenAIRE

    Lorenzo Ruiz, Alexis; Hospital Pediátrico de Tarará; Grau Abalo, Jorge; Instituto Nacional de Oncología y Radiobiología (INOR); Fumero Madam, Angelina; Hospital Pediátrico de Tarará; Vizcaíno Londián, María de los A.; Hospital Universitario “William Soler”; Martín Carbonell, Martha; Instituto de Angiología y Cirugía Vascular; Prado Torres, Francisco C.; Instituto Superior Politécnico “J. A. Echevarría”

    2014-01-01

    Existe una amplia variedad de conceptualizaciones e instrumentos sobre la ansiedad. Fue Charles D. Spielberger, en 1966, quien destacó la necesidad de distinguir entre la ansiedad como un estado emocional transitorio (ansiedad-estado) y como un rasgo de personalidad relativamente estable (ansiedad-rasgo). De conformidad con esta distinción, desarrolló el State-Trait Anxiety Inventory for Children (STAIC) para el estudio de la ansiedad en niños estadounidenses. En el presente trabajo se utiliz...

  20. Rasgos de personalidad como variables mediadoras en la edad de inicio del juego patológico y su severidad

    OpenAIRE

    Angulo Brunet, Ariadna

    2015-01-01

    El objetivo de este estudio es evaluar el rol de los rasgos de personalidad como variables mediadoras en la edad del juego patológico y su perfil clínico. Se administran diversas pruebas que evalúan los rasgos de personalidad a una muestra clínica de 1632 pacientes y se realiza un SEM para establecer las variables mediadoras. El modelo muestra unos buenos índices de ajuste así como una capacidad predictiva global buena. La edad de inicio es una variable mediadora de la severidad del juego pat...

  1. Personalidad, ansiedad estado-rasgo e ingreso a la universidad en alumnos preuniversitarios

    Directory of Open Access Journals (Sweden)

    Isabel Niño de Guzmán

    2000-12-01

    Full Text Available Estudio correlacional que identifica las dimensiones de personalidad, el tipo de ansiedad y las características sociodemográficas de alumnos de un centropreuniversitario. Se trabajó con 318 participantes de ambos sexos (43.8% mujeres y 56.2% hombres, que entre 16 y 19 años. Se los evaluó con los siguientes instrumentos: (a NEO PI-R de Costa y McCrae (1992, (b Inventario de Ansiedad Estado-Rasgo de Spielberger (IDARE, 1975 y (c reporte de los tutores. Los resultados confirman la presencia de una estructura factorial básica de cinco dimensiones. Asimismo, revelan correlaciones significativas entre el C.I., características de personalidad asociadas al factor conciencia e ingreso a la universidad. Entre las facetas que correlacionan con el ingreso destaca la autodisciplina. Finalmente, se discuten los resultados.

  2. Transformaciones actuales del poder punitivo. Caracterización de sus principales rasgos

    Directory of Open Access Journals (Sweden)

    Ricardo Antonio Cita Triana

    2012-12-01

    Full Text Available El documento aborda el tema de las recientes transformaciones del poder punitivo, a partir de dos niveles de análisis: el primero se ocupa de la descripción de los principales elementos contextuales en los que se insertan los cambios; el segundo desarrolla los rasgos generales que caracterizan estas transformaciones del poder punitivo en este momento. El propósito central es desarrollar un diagnóstico que permita detectar los principales y actuales problemas que enfrenta el discurso jurídico-penal y político criminal y, de este modo, contribuir a la determinación de nuevos escenarios de investigación de relevancia en la actualidad.

  3. A growth model of the cockle (Cerastoderma edule L.) tested in the Ooosterschelde estuary (The Netherlands)

    NARCIS (Netherlands)

    Rueda, J.; Smaal, A.C.; Scholten, H.

    2005-01-01

    The authors present an ecophysiological model of the bivalve Cerastoderma edule that simulates individual growth and reproduction under ambient conditions in temperature and food availability in the Oosterschelde estuary, SW Netherlands. The model contains feedback loops in the uptake and metabolism

  4. Ambient intelligence

    OpenAIRE

    Sanders, David; Gegov, Alexander

    2006-01-01

    This paper considers some history and the state of the art of Ambient Intelligence and from that seeks to identify new topics and future work. Ubiquitous computing, communications, human-centric computer interaction, embedded systems, context awareness, adaptive systems and distributed device networks are considered.

  5. Trazos de método para detectar los rasgos institucionales en académicos de universidades públicas mexicanas ante los estímulos federales

    Directory of Open Access Journals (Sweden)

    Rosalía S. Lastra B.

    2008-01-01

    Full Text Available El contenido del presente artículo esboza los rasgos más generales detectados como subyacentes en el ambiente universitario mexicano en torno al sistema público de evaluación y estímulos federales a académicos. Dichos rasgos se presentan a partir de la depuración de información que resultó relevante en la revisión sociohistórica de la educación superior, apoyados en el enfoque del Nuevo Institucionalismo Sociológico (NIS. A continuación se establecen las preguntas esenciales que resultaron significativas, y la propuesta de un método para detectar los componentes institucionales que se afirma, permiten acceder al conocimiento de la percepción -armónica o contradictoria con la visión oficial- de los integrantes de cada ápice académico universitario.1 El fin último es establecer dispositivos comunicacionales que faciliten el logro de consensos universitarios, mejoren el funcionamiento organizacional y el análisis de la consciencia con que desde el sector educativo público superior son emitidas señales axiológicas a la sociedad.

  6. Efectos de un ambiente de trabajo basado en facetas de la responsabilidad produce sobre la mejora contínua: el orden y el cumplimiento de estándares

    OpenAIRE

    Hernández-Flores, J.R. (José Roberto); Mateo-Dueñas, R. (Ricardo)

    2013-01-01

    Esta tesis doctoral tiene como objetivo conocer los efectos que un ambiente de trabajo basado en facetas de la Responsabilidad puede producir sobre la Mejora Continua y las personas. La Responsabilidad (Conscientiousness, en inglés), es un rasgo de la personalidad. Numerosos estudios han demostrado que dicho rasgo es importante para el desempeño de las tareas. La Responsabilidad está compuesta por seis facetas. Los ambientes de trabajo que hemos investigado se basan en dos de estas facetas: e...

  7. FLORA OF MOLOCHNYI ESTUARY COASTS

    Directory of Open Access Journals (Sweden)

    Kolomiychuk V.P.

    2013-09-01

    Full Text Available Present-day characteristic of the coastal flora of Molochnyi eastury is given, that is one of the largest estuaries in Ukraine, the shores and waters of which in 2009 became a part of the Pryazov’ya National Nature Park. The analysis of the main parameters of the flora is made. Rare component of the estuary coastal flora is characterized, further steps to conserve the nature of Pryazov’ya are proposed.

  8. Dispersion in alluvial convergent estuaries

    Science.gov (United States)

    Zhang, Zhilin; Savenije, Hubert H. G.

    2016-04-01

    The Van der Burgh's equation for longitudinal effective dispersion is a purely empirical method with practical implications. Its application to the effective tidal average dispersion under equilibrium conditions appears to have excellent performance in a wide range of alluvial estuaries. In this research, we try to find out the physical meaning of Van der Burgh's coefficient. Researchers like MacCready, Fischer, Kuijper, Hansen and Rattray have tried to split up dispersion into its constituents which did not do much to explain overall behaviour. In addition, traditional literature on dispersion is mostly related to flumes with constant cross-section. This research is about understanding the Van der Burgh's coefficient facing the fact that natural estuaries have exponentially varying cross-section. The objective is to derive a simple 1-D model considering both longitudinal and lateral mixing processes based on field observations (theoretical derivation). To that effect, we connect dispersion with salinity using the salt balance equation. Then we calculate the salinity along the longitudinal direction and compare it to the observed salinity. Calibrated dispersion coefficients in a range of estuaries are then compared with new expressions for the Van der Burgh's coefficient K and it is analysed if K varies from estuary to estuary. The set of reliable data used will be from estuaries: Kurau, Perak, Bernam, Selangor, Muar, Endau, Maputo, Thames, Corantijn, Sinnamary, Mae Klong, Lalang, Limpopo, Tha Chin, Chao Phraya, Edisto and Elbe.

  9. Rasgos de personalidad, bienestar psicologico y rendimiento academico en adolescentes argentinos

    Directory of Open Access Journals (Sweden)

    Alejandro Castro Solano

    2001-01-01

    Full Text Available Las diferencias individuales en el rendimiento escolar obedecen a tres tipos de factores: los intelectuales, los de aptitud para el estudio y los de personalidad. Los dos primeros han sido ampliamente estudiados. Recientemente comenzaron a surgir investigaciones que señalan que los factores exclusivamente intelectuales son pobres predictores del rendimiento académico a largo plazo y del éxito laboral fuera de los entornos educativos. Una gran cantidad de estudios revela que las variables de personalidad son importantes predictores de las adaptaciones que las personas realizan a los diferentes contextos en los cuales les toca vivir. El enfoque de los cinco factores de personalidad ha sido ampliamente estudiado, sin embargo casi no existen estudios con este enfoque en población adolescente, específicamente estudios locales. El presente trabajo tiene como objetivo replicar la estructura pentafactorial de los rasgos de personalidad en adolescentes de 13 a 19 años. Asimismo se analiza cuales son los rasgos de personalidad que están más relacionados con el logro académico y si existe alguna asociación entre el rendimiento académico y el bienestar autopercibido derivado de la adaptación efectiva a determinados contextos vitales relevantes para los jóvenes. Participaron de este estudio 337 jóvenes que vivían en la Ciudad de Buenos Aires y en el conurbano bonaerense (Argentina. Se aplicó el Cuestionario de los Cinco Factores de Personalidad (BFI de John (1990, como así también una encuesta sobre rendimiento esco- lar y otra sobre satisfacción vital por áreas (Escala D-1 de Andrews y Withey, 1976. Los resultados señalan que en adolescentes argentinos se verifica la misma estructura pentafactorial que en jóvenes estadounidenses. La dimensión conciencia apareció como el componente más relacionado con el mejor rendimiento. La dimensión neuroticismo no diferenciaba entre jóvenes con alto y bajo rendimiento.

  10. Rasgos de personalidad asociados con la ejecucion de determinados instrumentos musicales

    Directory of Open Access Journals (Sweden)

    Viviana Noemí Lemos de Ciuffardi

    2000-01-01

    Full Text Available El presente estudio tuvo como objetivo evaluar la relación existente entre la ejecución de determinados instrumentos musicales y los rasgos recurrentes de personalidad, en una muestra compuesta por 222 músicos profesionales y alumnos avanzados en el estudio de un instrumento musical. Se utilizó el Revised NEO Personality Inventory (NEO-PI-R de Costa y McCrae (1992, que permite evaluar diferentes rasgos de personalidad basándose en el modelo teórico de los cinco grandes factores de personalidad. Los resultados indicaron que existe una relación significativa entre las familias de instrumentos musicales (cuerdas, vientos bronce, vientos madera y las distintas facetas de personalidad contempladas por el NEO-PI-R (F de Hotelling = .97; P = .017. Esta relación significativa también se observó en los instrumentos específicamente seleccionados: (a flauta traversa, (b clarinete, (c trompeta, (d piano, (e guitarra, y (f saxofón; (F de Hotelling = 2.07; P = .002 Ylos cinco"grandes factores de personalidad que operacionaliza el NEO-PI-R. También se encontró una asociación significativa entre el sexo de los sujetos y la elección de ejecutar determinados instrumentos musicales. Los resultados por familias de instrumentos musicales dieron X2 (4, N~ 208 = 2.23; P = .000 y los resultados por instrumentos específicos elegidos dieron X2 (5, N=76 = 5.37 ; P = .000. Los factores cuyas relaciones resultaron significativas fueron: 1.- Extraversión: (cantidad e intensidad de las interacciones interpersonales. Dentro de este factor las facetas cuyas relaciones puntuaron estadísticamente significativas fueron: (a Sentimiento Gregario, (b Asertividad, (c Búsqueda de Excitación, y (d Emociones Positivas. Los instrumentistas que obtuvieron puntajes más altos en estas facetas fueron los ejecutantes de vientos bronces y quienes obtuvieron los puntajes más bajos fueron los ejecutantes de cuerdas, especialmente la guitarra y también al piano. 2

  11. SEDIMENT TRANSPORT IN THE YANGTZE RIVER ESTUARY

    Institute of Scientific and Technical Information of China (English)

    SHEN Zhigang

    2001-01-01

    The hydrodynamic and the sediment transport patterns within the estuary of the Yangtze River are complex because of interaction of fluvial and the tidal forces, depending on freshwater discharge and tidal range. Based on the data measured in recent years, this paper discusses the characteristics of flow and sediment movement in the Yangtze River Estuary and their influences on the evolution of the estuary.

  12. Detección de rasgos en imágenes binarias mediante procesos puntuales espaciales marcados

    OpenAIRE

    MATEU, JORGE; Lorenzo, Gil

    2002-01-01

    En este trabajo consideramos el problema de la detección de rasgos bajo la presencia de ruido en imágenes que tras un cierto tratamiento se reducen a binarias, por la presencia de dos tipos de elementos. Podemos encontrar ejemplos de este problema en la detección de minas por medio de imágenes de avión o satélite, en la búsqueda de rasgos en imágenes microscópicas de células, o en la caracterización de fallas en zonas de terremotos. En primer lugar revisamos algunos métodos de detección je...

  13. Los Pirineos en el contexto de las montañas del mundo: rasgos generales y peculiaridades

    OpenAIRE

    Comín, F.; Martínez Rica, J. P.

    2007-01-01

    Este trabajo introductorio intenta presentar la cordillera de los Pirineos, y especialmente sus características naturales dominantes, señalando en particular aquellas que comparte con otras cordilleras del globo, y aquellas que son peculiares de esta cadena, o compartidas con pocos sistemas montañosos similares. Veamos pues, en primer lugar, algunos rasgos generales de la mayor parte de las cordilleras.

  14. Indicadores de ansiedad en el DFH y rasgos de personalidad en niños: un estudio de validez

    Directory of Open Access Journals (Sweden)

    Marcos Antonio Batista

    2014-01-01

    Full Text Available Este estudio tuvo como objetivo la búsqueda de evidencias de validez por medio del análisis de correlación entre los indicadores de ansie - dad de Dibujo de la Figura Humana – DFH - de Karen Machover y la Escala de Rasgos de Personalidad para Niños (ETPPC . Participaron 240 niños, de ambos sexos, con edades comprendidas entre 8 y 10 años, estudiantes de enseñanza básica de la red pública de Brasil. Por medio de los análisis de correlación se demostró que cuando los indicadores DFH son agrupados, existen correlaciones significativas con los rasgos de personalidad, y corroborado con lo esperado, se puede inferir que hay características que convergen una vez que la ansiedad es apenas parte del constructo de rasgos de personalidad como el neuroticismo y la extroversión.

  15. Rasgos psicopáticos infanto-juveniles: evaluación e implicaciones en un estudio prospectivo

    Directory of Open Access Journals (Sweden)

    Estrella Romero

    2016-01-01

    Full Text Available En este trabajo se analizan los datos de un estudio longitudinal a largo plazo con el objetivo de examinar las implicaciones de los rasgos psicopáticos infanto-juveniles, evaluados a través de la mCPS (modified Child Psychopathy Scale, en la conducta antisocial en la adolescencia. Se analizan los datos recogidos en 141 niños (edad media = 7.80, que fueron seguidos seis y diez años más tarde. Los resultados muestran que los niños con altas puntuaciones en rasgos psicopáticos presentan en la adolescencia temprana niveles relativamente altos de problemas de conducta. Además, a lo largo de la adolescencia se produce en ellos un mayor incremento en implicación con amigos antisociales, consumo de cannabis y agresión proactiva. Así, los resultados muestran que los rasgos psicopáticos medidos en la niñez se asocian con un desarrollo más desfavorable, particularmente en indicadores que, como la agresión proactiva, se han vinculado clásicamente a la personalidad psicopática en adultos.

  16. Rasgos Pedagógicos de los Objetos de Aprendizaje Pedagogical Features of Learning Objects

    Directory of Open Access Journals (Sweden)

    Chiappe Laverde Andres

    2008-07-01

    Full Text Available Los objetos de aprendizaje (OA son considerados hoy como una alternativa viable e interesante para el desarrollo de contenidos para programas educativos mediados por las Tecnologías de la Información y la Comunicación (TIC. No obstante la pertinencia del tema para el momento actual de la educación superior en toda Latinoamérica, es preciso reflexionar más en profundidad acerca de lo que significan los OA y su impacto en el proceso educativo. El estudio de los rasgos pedagógicos de los objetos de aprendizaje coloca a la comunidad académica frente a un escenario que requiere la pronta identificación de sus retos y limitaciones de cara a la inminente ejecución de procesos de incorporación de los OA en las dinámicas de las instituciones educativas. Learning objects (LO are regarded today as a viable and interesting alternative for development of content for educational programs mediated by information and communication technologies (ICT. Attending the relevance of this topic just for this historic moment of higher education throughout Latin America, we need to think more deeply about what LO means and its impact on the educational process. The study of the pedagogical features of learning objects placed to the academic community in front of a scenario that requires prompt identification of their challenges and constraints facing the imminent execution of incorporation processes of LO in educational institutions dynamics.

  17. The Mandovi and Zuari estuaries

    Digital Repository Service at National Institute of Oceanography (India)

    Shetye, S.R.; DileepKumar, M.; Shankar, D.

    , MZ near the mouths of the two estuaries. “T” in a circle shows location up to which tidal influence is felt in the rivers Kushavati, Uguem, Guloli, Khandepar, and Mandovi. xii June 22, 2007 12:51 RPS rpb001_fm 73°48'E 74°00'E 74°12'E 15°12'N 15°24'N...

  18. heterokonta de ambientes estuariales y salinos de la Argentina

    Directory of Open Access Journals (Sweden)

    Silvina M. Rosa

    2006-01-01

    Full Text Available Se presentan y describen cinco cepas de Thraustochytriales aisladas de dos ambientes: uno salino continental y otro estuarial. Debido a que las observaciones no coincidieron exactamente con las descripciones originales, tanto en lo morfológico como en lo ecológico, las cepas se determinaron como Thraustochytrium aff. antarcticum, Ulkenia aff. radiata y U. aff. visurgensis. Estos registros constituyen las primeras citas de Labyrinthulomycetes para Argetnina.

  19. Estuary-wide genetic stock distribution - Columbia River Estuary Tidal Habitats

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The goal of the tidal-fluvial estuary study is to determine the estuary's contribution to the spatial structure and life history diversity of Columbia River salmon...

  20. Salmon habitat use, tidal-fluvial estuary - Columbia River Estuary Tidal Habitats

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The goal of the tidal-fluvial estuary study is to determine the estuary's contribution to the spatial structure and life history diversity of Columbia River salmon...

  1. In-stream PIT detection, estuary wetlands - Columbia River Estuary Tidal Habitats

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The goal of the tidal-fluvial estuary study is to determine the estuary's contribution to the spatial structure and life history diversity of Columbia River salmon...

  2. Conciencia ambiental y conducta sustentable relacionada con el uso de energía para iluminación

    Directory of Open Access Journals (Sweden)

    Graciela Lucía Tonello

    2015-06-01

    Full Text Available La conciencia ambiental es definida como un concepto multidimensional que constituye la dimensión actitudinal del comportamiento pro ambiental. En un contexto global y local de crisis energética, el presente trabajo tuvo como objetivos investigar las interrelaciones entre las diferentes dimensiones de la conciencia ambiental y la posible sustentabilidad detrás de conductas relacionadas con el uso de la iluminación, en una muestra de estudiantes universitarios. La metodología incluyó el desarrollo y administración de una encuesta con diferentes secciones para estimar la conciencia ambiental mediante escalas clasificatorias y preguntas sobre percepción de problemas ambientales, la atribución de responsabilidades, escalas estandarizadas de preocupación ambiental, conocimientos ambientales y la propensión al futuro como un rasgo de la personalidad sustentable. Los resultados en general muestran que la temática energética, al menos la referida a la iluminación tomada en este estudio, no es percibida como problemática ambiental sino como una problemática que afecta a nivel individual, y la perspectiva temporal de futuro evidenciada por la muestra está referida al tiempo futuro en sí mismo, más que como rasgo de personalidad sustentable.

  3. Perfeccionismo socialmente prescrito y los cinco grandes rasgos de la personalidad en niños españoles

    Directory of Open Access Journals (Sweden)

    María Vicent

    2016-08-01

    Full Text Available El objetivo de este estudio consistió en examinar la relación entre el Perfeccionismo Socialmente Prescrito (PSP y los cinco grandes rasgos de la personalidad en una muestra compuesta por 804 alumnos de Educación Primaria entre 8 y 11 años de edad (M = 9.57; SD = 1.12. Se empleó la subescala PSP de la Child and Adolescent Perfectionism Scale (CAPS y el Cuestionario Big Five de Personalidad para Niños (BFQ-N que mide los rasgos de Neuroticismo, Extraversión, Apertura a la experiencia, Cordialidad y Conciencia. Los resultados del análisis de diferencia de medias mostraron que los alumnos con alto PSP puntuaron significativamente más alto en Conciencia, Cordialidad, Extraversión y Apertura a la experiencia que sus iguales con bajos niveles de PSP, con tamaños del efecto pequeños en todos los casos. Por el contrario, no se observaron diferencias significativas en Neuroticismo. Los análisis de regresión logística revelaron que todos los rasgos de la personalidad, a excepción del Neuroticismo, cuyos resultados no alcanzaron la significación estadística, predijeron significativa y positivamente altas puntuaciones en PSP, con niveles de OR que oscilaron entre 1.01 (para Conciencia y Cordialidad y 1.03 (para Apertura a la experiencia y Extraversión.

  4. Rasgos instrumentales (masculinos y expresivos (femeninos, normativos (típicos e ideales en México

    Directory of Open Access Journals (Sweden)

    Rolando Díaz Loving

    2001-01-01

    Full Text Available Diversas investigaciones han demostrado reiteradamente que los rasgos instrumentales (masculinos y expresivos (femeninos, asignados tradicionalmente de manera diferencial a hombres y mujeres, en realidad se derivan de procesos de socialización y endoculturación que en la actualidad y en algunas culturas ha hecho que estos rasgos.se presenten intensiva e indistintamente en ambos sexos. El desarrollo de instrumentos de medición de estas características y su validación en diversas culturas ha mostrado lo robusto de un constructo teórico multidimensional y dualista que permite no sólo describir de manera clara a las personas, sino que además, demuestra el papel central que juega la normatividad sociocultural en el desarrollo de dichas características. Estos conocimientos y la teoría que los sustenta, han permitido el desarrollo de medidas nuevas de masculinidad y feminidad, que por demostrar el predominio de factores sociales sobre los genéticos, pudieran manifestarse a través de distintas definidoras al ir de una cultura a otra. Con el objeto de identificar los atributos instrumentales y expresivos que describen a hombres y mujeres mexicanas, se realizaron una serie de grupos de enfoque de donde se derivaron 323 adjetivos correspondientes a estas dos dimensiones. Posteriormente, para obtener la normatividad de cada atributo, se aplicó un inventario en el que se pidió a 856 sujetos divididos por sexo y nivel educativo que indicaran qué tan típico e ideal era que hombres y mujeres poseyeran dichos rasgos. Los resultados muestran listados de características expresivas e instrumentales típicas e ideales que fueron reportadas como socialmente deseables o indeseables tanto para hombres como para mujeres. Las listas obtenidas se discuten en términos de género y cultura.

  5. Competencias y rasgos de la ética profesional en los posgrados de la Universidad Iberoamericana-Puebla

    OpenAIRE

    J. Martín López Calva; Isabel Royo Sorrosal; Celine Armenta Olvera; Guadalupe Barradas Guevara; Nora Guajardo Santos; Edith Huesca Ramírez

    2009-01-01

    En este artículo presentamos los avances de la investigación sobre las competencias y los rasgos de la ética profesional entre los docentes y estudiantes de posgrado de la Universidad Iberoamericana-Puebla, que constituyen los resultados parciales de un proyecto interuniversitario en el que participan quince instituciones mexicanas de educación superior. El objetivo es llegar a proponer lineamientos para la formación de una profesionalidad ética en los posgrados de las universidades del país....

  6. Influencia de los rasgos de personalidad en la aplicación de la Terapia de Juego no Directiva

    OpenAIRE

    Luna, María Augusta

    2013-01-01

    Esta investigación nace de la necesidad de estudiar la aplicación del Modelo Integrativo en el ámbito infantil. Específicamente, busca analizar y relacionar la influencia de los rasgos de personalidad en la aplicación de la terapia de juego no directiva centrada en el niño, como lo sostiene la Psicoterapia Integrativa focalizada en la personalidad. La metodología utilizada es el análisis de casos, que resultó efectiva para poder concluir que la terapia de juego no directiva centrada en el niñ...

  7. Rasgos funcionales en el género Quercus: estrategias adquisitivas frente a conservativas en el uso de recursos

    Directory of Open Access Journals (Sweden)

    E. G. de la Riva

    2014-01-01

    Full Text Available Las especies del género Quercus constituyen uno de los grupos más abundantes e importantes de plantas leñosas de la Península Ibérica, estando su distribución determinada por la disponibilidad de agua, el tipo de suelo y la historia del manejo. El conocimiento de la variación de sus características morfo-funcionales puede ayudarnos a comprender el grado de diversificación de las especies del mismo género y los mecanismos que controlan sus patrones de distribución. Los objetivos principales de este estudio son: (i analizar las relaciones existentes entre los diferentes rasgos funcionales dentro del género Quercus y testar cómo se ajustan a las estrategias de captación de recursos; y (ii comprobar si existe coordinación entre los rasgos medidos a nivel de hoja, tallo y raíz. El muestreo se llevó a cabo en Sierra Morena (Córdoba y la Sierra del Aljibe (Cádiz, cuantificándose rasgos funcionales claves a nivel de hoja, tallo, raíz, tamaño de planta y fisiología en cinco especies de Quercus (Q. canariensis, Q. coccifera, Q. faginea, Q. ilex y Q. suber. Los resultados muestran que las diferentes especies de Quercus presentan claros patrones en sus estrategias funcionales que están relacionados con su distribución, encontrando un gradiente desde especies más conservativas en el uso de recursos en condiciones de menor disponibilidad de agua a especies más adquisitivas en zonas más húmedas. A su vez, se aprecia una coordinación entre los patrones de rasgos funcionales encontrados a nivel de hoja, tallo y de raíz que apoya la existencia de un “espectro de economía” a nivel de la planta entera.

  8. Estudio de los rasgos de la personalidad en población normal con el cuestionario Salamanca

    OpenAIRE

    Caldero Alonso, Amaya

    2014-01-01

    [ES]Existe un aumento del interés en los trastornos de personalidad exigido por la clínica diaria dado que supone un 50% de la comorbilidad en salud mental. Las pruebas diagnósticas actuales se caracterizan por ser largas y farragosas. Por eso, en 2004 se crea el Cuestionario Salamanca, una prueba de screening para evaluar los rasgos/trastornos de personalidad en el contexto clínico diario. En 2007 aparece la versión modificada del Cuestionario Salamanca después de su validación con la ...

  9. La semántica del adjetivo y su representación mediante estructura de rasgos

    OpenAIRE

    Climent Roca, Salvador

    1995-01-01

    Por el trabajo que se describe se ha formulado un marco general de representación semántica de los adjetivos en una base de conocimiento léxica basada en estructuras de rasgos en la que operan la herencia y la unificación. Como principales aportaciones cabe destacar el propio diseño de un marco representativo suficientemente expresivo como para abarcar múltiples aspectos del significado del adjetivo, tales como orden superficial, restricciones selectivas, semántica léxica y semántica formal. ...

  10. Competencias y rasgos de la ética profesional en los posgrados de la Universidad Iberoamericana-Puebla

    Directory of Open Access Journals (Sweden)

    J. Martín López Calva

    2009-01-01

    Full Text Available En este artículo presentamos los avances de la investigación sobre las competencias y los rasgos de la ética profesional entre los docentes y estudiantes de posgrado de la Universidad Iberoamericana-Puebla, que constituyen los resultados parciales de un proyecto interuniversitario en el que participan quince instituciones mexicanas de educación superior. El objetivo es llegar a proponer lineamientos para la formación de una profesionalidad ética en los posgrados de las universidades del país.

  11. Depresión y ansiedad estado/rasgo en internos adscritos al "Programa de Inducción al Tratamiento Penitenciario" en Bucaramanga, Colombia

    Directory of Open Access Journals (Sweden)

    Ana Fernanda Uribe Rodríguez

    2012-12-01

    Full Text Available El artículo describe las características de la depresión y la ansiedad estado/rasgo y su prevalencia en internos adscritos al "Programa de Inducción al Tratamiento Penitenciario" del Instituto Nacional Penitenciario y Carcelario -INPEC- en Bucaramanga, Colombia. La muestra comprendió 112 internos con un promedio de edad de 33 años, a quienes se les aplicó el Inventario de Depresión Estado Rasgo (IDER y el Inventario de Ansiedad Estado Rasgo (STAI. Los resultados indican que un 43,1% realizó su primera transgresión a la norma entre los 8 y 18 años de edad, y un 74,1% presentó consumo de sustancias psicoactivas, mientras los registros de manifestaciones depresivas revelan que el 16,7% la calificó como estado y un 43,68% como rasgo. Por su parte, la afectación ansiosa se mostró en un 8,03% como estado y en un 85,7% como rasgo. De acuerdo con esto, hubo mayor proporción de personas con experiencias previas que desarrollaron cuadros sintomatológicos, que aquellas en las que la situación de encarcelamiento constituye un causante o detonante.

  12. Los rasgos de la lírica del exilio en la poética de Luis Cernuda

    Directory of Open Access Journals (Sweden)

    Ana Martínez García

    2015-01-01

    Full Text Available La obra literaria creada en el destierro por los españoles tuvo ciertos caracteres esenciales que le llevan a formar parte de una tendencia distinta, a no ligarse a los movimientos literarios coetáneos que se manifestaban en la península. La lírica fue el género más influenciado por la situación que los exiliados estaban experimentando, razón por la que sus textos pueden dividirse en periodos, con diferentes rasgos, dependientes de la situación histórica que experimentaban: Segunda Guerra Mundial, final de la guerra y afianzamiento del Franquismo, etc. Entre los muchos autores exiliados, Luis Cernuda fue uno de los más reconocidos, donde los rasgos de la poética del destierro estaban presentes, de una forma velada, trágica y sucinta, como era propio de toda su producción.

  13. Competencias y rasgos de ética profesional en estudiantes y profesores de posgrado de la UNAM

    Directory of Open Access Journals (Sweden)

    Ana Hirsch Adler

    2009-01-01

    Full Text Available En este artículo se describen los resultados obtenidos con estudiantes y profesores de posgrado de la Universidad Nacional Autónoma de México (UNAM en relación con la ética profesional. La información se basa en la aplicación de un instrumento expresamente diseñado para el proyecto de investigación sobre Ética Profesional de la unam.1 Lo coincidente en el instrumento aplicado a las muestras de estudiantes y profesores es la pregunta abierta acerca de cuáles son los cinco principales rasgos de "ser un buen profesional" y una escala de actitudes, que cuenta con 55 proposiciones.2 La muestra de los estudiantes de los 40 posgrados de la unam fue de 1 086 y la de los profesores, de 719, únicamente de los niveles de maestría y doctorado. Este artículo se centra en la comparación de los resultados obtenidos con los estudiantes y los profesores. Se presentan, además, algunas ideas sobre las competencias en educación, con fines de reflexión, ya que la clasificación en competencias (cognitivas, éticas, sociales, afectivo-emocionales y técnicas y sus respectivos rasgos3 fue utilizada para codificar todas las respuestas a la pregunta abierta y las proposiciones de la escala.

  14. Trapping of sediment in tidal estuaries

    NARCIS (Netherlands)

    Chernetsky, A.

    2012-01-01

    An estuary is an ideal habitat for various aquatic species. At the same time, estuaries and adjacent rivers are used as fast navigation routes between the coastal and inland territories. The fast industrial development and the subsequent growth of cities and trade have led to large-scale anthropogen

  15. Prediction in ungauged estuaries: An integrated theory

    NARCIS (Netherlands)

    Savenije, H.H.G.

    2015-01-01

    Many estuaries in the world are ungauged. The International Association of Hydrological Sciences completed its science decade on Prediction in Ungauged Basins (PUB) in 2012 (Hrachowitz et al., 2013). Prediction on the basis of limited data is a challenge in hydrology, but not less so in estuaries, w

  16. Ansiedad estado y ansiedad rasgo en bailarines según el tipo de danza que practican y su condición como bailarín

    OpenAIRE

    Valle, María Liliana; Universidad de Lima (Perú)

    2014-01-01

    Se determinó comparativamente la ansiedad estado y la ansiedad rasgo en bailarines según el tipo de danza escogido (clásica y contemporánea) y su condición como bailarín (profesional y amateur). Se trabajó con 58 bailarines de Lima Metropolitana, de los cuales el 24,1 % fueron bailarines clásicos amateur; el 27,6 %, bailarines clásicos profesionales; el 20,7 %, bailarines contemporáneos amateur, y 27,6 %, bailarines contemporáneos profesionales. Se utilizó el Inventario de Ansiedad Rasgo-Esta...

  17. Validación de la versión mexicana del inventario de expresión de ira estado-rasgo (staxi-2)

    OpenAIRE

    FÉLIX JESÚS OLIVA MENDOZA; MARÍA DEL ROCÍO HERNÁNDEZ POZO; NAZIRA CALLEJA BELLO

    2010-01-01

    Esta investigacion busca determinar las propiedades psicometricas de la version mexicana del Inventario de Expresion de la ira estado-rasgo (STAXI-2; Miguel-Tobal, Casado, Can-Vindel Spielberger, 2001). En el participaron 865 personas, entre los 12 y 60 anos de edad de las cuales 54.9% eran hombres y 45.1%, mujeres., Entre ellos habia estudiantes (46%), deportistas (42.4%) y poblacion general (11.6%). Se presento una similitud en la estructura factorial de las escalas estado, rasgo y expres...

  18. El papel del mercado del suelo en la configuración de algunos rasgos socioespaciales de las ciudades latinoamericanas

    Directory of Open Access Journals (Sweden)

    Samuel Jaramillo

    1999-01-01

    Full Text Available Una interrogación central orienta la exploración adelantada en este artículo, ¿existen peculiaridades en el funcionamiento de los mercados de tierra en las ciudades latinoamericanas? En contra de lo que suele pensarse entre los especialistas de este tema, este trabajo sostiene que las formas de operación del mercado del suelo urbano en las ciudades latinoamericanas obedece a los patrones generales encontrados en ciudades capitalistas. No obstante, a causa de la presencia de condiciones sociales, políticas y económicas muy particulares de la ciudad latinoamericana, la organización socioespacial de esta ciudad tiene rasgos muy peculiares, presentes a lo largo y ancho del continente. Estos rasgos derivan en parte de las especificidades del proceso de acumulación latinoamericano, caracterizado por ser un régimen de bajos salarios, con grandes desigualdades sociales, un acelerado crecimiento urbano, debilidad estructural del aparato estatal, con presencia de significativos obstáculos a la homogeneización capitalista de la producción de espacio construído. A pesar de la diversidad nacional latinoamericana, sus ciudades han ido configurándose en torno de ciertos rasgos comunes, muy específicos de la región: alejamiento permanente de las élites en una misma dirección, cada vez más lejana del centro histórico, una aparente decadencia socioeconómica de este mismo centro, y una secular segregación socioespacial y heterogeneidad en la producción del espacio. En cada uno de estos casos el mercado ha operado como uno de los reguladores centrales del comportamiento económico, contribuyendo a la gestación de las características mencionadas. No obstante, en algunos casos, sus formas de operación han sido opuestas a las comunmente aceptadas: la salida de las elites del centro sería en parte voluntaria y en parte obligada por la competencia impuesta por otros usos, más populares, altamente rentables; esta salida esta léjos de

  19. Rasgos de historia de vida de especies pioneras en la Reserva Natural Ibanasca (Ibagué, Tolima, Colombia

    Directory of Open Access Journals (Sweden)

    Gómez Ruíz, Pilar Angélica

    2006-12-01

    Full Text Available Los rasgos de historia de vida (RHV son cualidades o atributos propios de cada individuo que representan
    respuestas en aspectos fisiológicos, morfológicos, anatómicos y ecológicos ante las condiciones ambientales
    presentes. En la Reserva Natural Ibanasca se seleccionaron 17 especies de plantas leñosas pioneras y en cada una se evaluaron 18 rasgos relacionados con las fases de dispersión, establecimiento y persistencia con el fin de establecer agrupaciones entre las especies. Con base en un Análisis de Conglomerados se obtuvieron cinco
    grupos en los análisis general y morfológico y cuatro grupos en el análisis de semilla. Además, se estableció
    las correlaciones entre algunas variables obteniendo que altura-área foliar y número de semillas por fruto-área
    foliar se correlacionaban positivamente. Solanum sycophanta, Croton magdalenesis y Brunellia colombiana se agruparon por ser las especies de mayor altura mientras que Inga sp. y Citharexylum subflavecens son las especies de semillas más grandes y pesadas, también están Montanoa quadrangularis y Bocconia frutescens como las especies de mayor tase relativa de crecimiento al tener las mayores áreas específicas foliares y siempre aparte se encontró a Cecropia cf. mutisiana por ser de las más altas, mayor área foliar y mayor producción de semillas. Con
    base en los resultados obtenidos se considera que los rasgos que mejor caracterizan a este grupo de especies son: abundante producción de semillas de fácil dispersión, tasa de crecimiento rápida representada en un área específica foliar grande, tamaños de hoja grandes manifestados en áreas foliares grandes, capacidad de
    regeneración vegetativa, abundante producción de hojarasca y ser heliófilas (tolerantes a la luz. Con base en
    lo anterior pueden proponerse las siguientes especies para una futura restauración ecológica de la Reserva:
    Cecropia cf. mutisiana, Bocconia

  20. ambientes mediterráneos

    Directory of Open Access Journals (Sweden)

    G. Escribano-Ávila

    2015-01-01

    Full Text Available A nivel global, dos tendencias opuestas gobiernan el uso de la tierra: la intensificación y el abandono. Esta última supone una oportunidad para larecuperación de los ecosistemas, una necesidad urgente dada la actual crisis ambiental. La comunidad de dispersores frugívoros es determinantepara recuperar la estructura y complejidad de la vegetación en campos abandonados, ya que éstos suelen estar desprovistos de propágulos.Recientes estudios han resaltado la especial relevancia de los mamíferos frugívoros en el proceso de dispersión de semillas en ambientesdegradados como los campos abandonados. Esto es debido a una serie de rasgos morfológicos y de comportamiento que caracterizan a losfrugívoros mamíferos y que les hace ser dispersores especialmente efectivos. Generalmente los mamíferos frugívoros tienen un mayor tamañocorporal, mayores áreas de campeo y distancias de dispersión, frecuente uso de hábitats abiertos, movilizando así más semillas hasta los camposabandonados que otros grupos de frugívoros (e.g. aves. Una vez que una semilla ha sido depositada tiene que superar las sucesivas etapas hastael establecimiento (depredación post-dispersiva, germinación, supervivencia y crecimiento. Los mamíferos frugívoros favorecen todo este procesoen mayor medida que otros dispersores. A nivel interespecífico pueden dispersar mayor diversidad de especies al estar generalmente menoslimitados por el tamaño de fruto, y a nivel intra-especifico no seleccionan semillas de pequeño tamaño. Además, suelen depositar las semillas enmicrohábitats que resultan especialmente adecuados para el reclutamiento. En consecuencia, los mamíferos son un elemento clave en los ensamblesde frugívoros que propician la regeneración de los campos abandonados y su función ecológica debe ser considerada en la restauración y manejode hábitats degradados.Palabras clave: áreas degradadas; bosque remanente; cambio de los usos del suelo; dispersi

  1. El lenguaje de los niños ciegos y la cuestión de los rasgos autistas

    Directory of Open Access Journals (Sweden)

    Miguel Pérez Pereira

    2000-12-01

    Full Text Available Hobson et al. (Brown, Hobson. Lee y Stevenson, 1997; Hobson, Brown, Minter y Lee, 1997 han investigado la similitud entre el autismo y la ceguera congénita. En este artículo se revisa la evidencia empírica a favor de la existencia de rasgos autistas en el lenguaje de los niños ciegos de nacimiento, a la vez que se aportan nuevos datos de investigaciones del autor. Se centra el interés en (a el uso de los pronombres personales, (b el uso de imitaciones y habla formuláica, (c el uso egocéntrico del lenguaje, y (d la capacidad de iniciar conversaciones y de contingencia conversacional. El análisis pone en cuestión la supuesta similitud entre los niños ciegos y los autistas, además parece refutar la teoría de Hobson.

  2. Rasgos de sentido de vida del enfoque de resiliencia en personas mayores entre 65 y 75 años

    Directory of Open Access Journals (Sweden)

    Jiménez Segura, Flor

    2004-12-01

    Full Text Available La resiliencia es la capacidad para activar las fortalezas y proteger la integridad personal al enfrentar adversidades, construyendo a partir de éstas. En este estudio se identificaron los ocho rasgos de sentido de vida según el enfoque de resiliencia (Intereses especiales, Metas, Motivación para el logro, Aspiraciones educativas, Optimismo, Persistencia, Fe y Espiritualidad y Sentido de propósito, que han presentado personas adultas mayores de 65 a 75 años durante sus vidas. Los principios teórico-metodológicos utilizados son los del paradigma cualitativo. Se efectuaron entrevistas en profundidad a cuatro mujeres y cuatro hombres que pertenecen al grupo de Envejecimiento Integral de la Universidad de Costa Rica o a la Asociación Gerontológica Costarricense. Aunque la mayoría de las personas adultas mayores participantes en el estudio no identificaron metas claras en la actualidad, durante sus vidas contaron con las condiciones y herramientas personales que contribuyeron con el desarrollo de los rasgos de sentido de vida del enfoque de resiliencia. The concept of resilience centers around the human capacity to rise from adversities and to be strengthened by them. Traits of the Sense of Purpose component of a resilience model (Special interests, Goal directedness, Achievement motivation, Educational aspirations, Hopefulness, Persistence, Faith and Spirituality, and Meaningfulness were identified in older persons 65 to 75 years of age. In-depth interviews were conducted with four women and men who participate in programs that promote healthy development in older adults. Although most of the persons interviewed had difficulty specifying present goals, during their lives and currently they have had the environmental and personal conditions for the strengthening of the traits identified with the presence of a sense of purpose.

  3. Análisis ontogénico de rasgos craneofaciales robustos en poblaciones humanas de Patagonia

    Directory of Open Access Journals (Sweden)

    González, Paula N.

    2007-01-01

    Full Text Available Las poblaciones humanas que habitaron el sur de Patagonia durante el Holoceno tardío presentan rasgos craneofaciales robustos que las diferencian del resto de los humanos modernos. El estudio de los factores causales de la robustez se ha basado en el análisis de individuos adultos, por lo tanto los mecanismos ontogénicos involucrados en la diferenciación de estas poblaciones son aún desconocidos. El objetivo de este trabajo es analizar la ontogenia de la robustez craneofacial en diversas poblaciones humanas. Se analizaron 5 muestras de individuos subadultos (Sad, de 5 a 15 años y adultos (Ad, procedentes del Noroeste Argentino y Patagonia (n=201. Se emplearon landmarks y semilandmarks con el fin de describir la glabela, los procesos frontal y zigomático, y el mastoides. Para establecer si los rasgos poblacionales específicos se encuentran presentes en Sad se compararon los patrones de ordenación de Ad y Sad obtenidos mediante un análisis de PROTEST. Los resultados indican que el patrón de variación morfológica se establece tempranamente en Sad. Se evaluó si la diferenciación en los Ad de las diversas poblaciones es atribuible al escalamiento ontogénico o a diferencias en las trayectorias. Los resultados muestran que si bien las poblaciones del sur alcanzan un mayor tamaño, las trayectorias ontogénicas entre las poblaciones estudiadas difieren significativamente. Por lo tanto, la robustez se establece tempranamente en la ontogenia postnatal y es modificada por la divergencia en los patrones de cambio en forma asociados a los cambios en tamaño.

  4. Water Column Methylation in Estuaries

    Science.gov (United States)

    Schartup, A. T.; Calder, R.; Soerensen, A. L.; Mason, R. P.; Balcom, P. H.; Sunderland, E. M.

    2014-12-01

    Methylmercury (MeHg) is a neurotoxin that bioaccumulates in aquatic food webs and affects humans and wildlife through fish consumption. Many studies have measured active methylation/demethylation in ocean margin sediments but few have reported similar rates for the marine water column. This presentation will review available evidence for water column methylation in estuaries, including new experimental measurements of methylation/demethylation rates from a deep subarctic fjord in Labrador Canada collected in Spring and Fall of 2012-2013. We used these and other data to construct a mass budget for MeHg in the estuary and show that water column methylation (with rates ranging from 1.5 to 2.8 % day-1), is the largest contributor, followed by inputs from rivers (4.9 mol year-1), to the in situ pool of MeHg available for uptake by biota. By contrast, the sediment in this system is a net sink for MeHg (-1.5 mol year-1). We discuss the relationship between observed MeHg and other ancillary environmental factors (organic carbon, sulfur and nutrients) as well as implications for the response time of fish to future changes in mercury inputs.

  5. La mineralización aurífera en Cuba: clasificación y rasgos geológico-geoquímicos para la prospección

    Directory of Open Access Journals (Sweden)

    Roberto Díaz-Martínez

    2001-03-01

    Full Text Available En Cuba existe una gran diversidad de yacimientos y manifestaciones minerales auríferos, de tipo oro epitermal, asociados a VMS, relacionados con pórfidos, residuales, placeres, etc.; sin embargo, no existe aún una clasificación de los mismos que considere el tipo de depósito y sus diferentes estilos, los rasgos esenciales del marco geológico, las particularidades de la mineralización, los tipos de alteraciones acompañantes, los indicadores geoquímicos y mineralógicos, entre otros aspectos de interés. En este artículo se propone una clasificación para los depósitos auríferos cubanos, tomando como referencia la clasificación propuesta por Corbett y Leach (1995, en la cual se integran criterios de numerosos autores. Especial atención se le presta a algunos distritos poco estudiados y con una mineralización aurífera muy particular, como son los distritos Santa Clara, Holguín y Sagua-Baracoa, desarrollados fundamentalmente dentro de un ambiente geológico con predominio de los complejos de la asociación ofiolítica

  6. Psicologia do Ambiente

    OpenAIRE

    Antunes, Dalila; Bernardo, Fátima; Palma-Oliveira, José-Manuel

    2011-01-01

    Na aplicação da Psicologia à área do AMBIENTE importa em primeiro lugar definir o que se entende, neste contexto, por ambiente. O conceito é entendido como toda a envolvente que rodeia o ser humano. Referimo-nos pois ao espaço físico e aos estímulos que nele existem (som, ar, paisagem…), dirigindo-se a Psicologia do Ambiente ao estudo e intervenção sobre a forma como o ambiente influencia o indivíduo ou grupos, e sobre o modo como o comportamento dos indivíduos e grupos influenciam o ambiente...

  7. Atmosphere and Ambient Space

    DEFF Research Database (Denmark)

    Schmidt, Ulrik

    Atmosphere and Ambient Space This paper explores the relation between atmosphere and ambient space. Atmosphere and ambient space share many salient properties. They are both ontologically indeterminate, constantly varying and formally diffuse and they are both experienced as a subtle, non......-signifying property of a given space. But from a certain point of view, the two concepts also designate quite dissimilar experiences of space. To be ’ambient’ means to surround. Accordingly, ambient space is that space, which surrounds something or somebody. (Gibson 1987: 65) Since space is essentially...... of a surrounding character, all space can thus be described as having a fundamentally ambient character. So what precisely is an ambient space, then? As I will argue in my presentation, ambient space is a sensory effect of spatiality when a space is experienced as being particularly surrounding: a ‘space effect...

  8. Birds of Mahi River estuary, Gujarat, India

    Directory of Open Access Journals (Sweden)

    P.J. Pandya

    2010-06-01

    Full Text Available The Mahi river estuary is one of the major estuaries of Gujarat. This paper presents a comprehensive list of birds of the Mahi river estuary (nearly 50 km stretch and the adjacent banks/ravines and defines the avian diversity at three major estuarine gradations with a brief check of similarity and diversity within the three. The present observation is the outcome of a 3 year period from August 2006 to July 2009. A sum total of 118 species belonging to 42 families were reported and listed as on Upstream, Midstream, and Downstream of estuary. No significant difference was seen in the species richness at the three zones; a change in avian composition at upstream and downstream was notable.

  9. National Estuary Program Study Area Boundaries

    Data.gov (United States)

    U.S. Environmental Protection Agency — There are 28 National Estuary Programs (NEPs) in the U.S.that implement habitat protection and restoration projects with their partners. This work takes place within...

  10. Carbon isotope geochemistry in the Yalujiang estuary

    Institute of Scientific and Technical Information of China (English)

    吴莹; 张经

    2001-01-01

    The distribution of particulate organic carbon (POC) along the lower reaches is similar between the dry season and the flood season in the Yalujiang Estuary, North China. However, the values of particulate organic carbon of the upperstream in the dry season are one magnitude lower than the concentrations in the flood season. Stable carbon isotope ratios have been used to study the sources of particulate organic carbon in the Yalujiang Estuary. The isotopic composition of POC shows a range from -23.1‰ to -29.4‰ with a little seasonal variation. The isotopic evidence indicates that the POC in the Yalujiang Estuary is predominantly of terrestrial origin rather than a result of in situ plankton. The study of the ratio of POC: Chla shows that the turbidity maximum plays an important role in POC cycle in the Yalujiang Estuary. Organic detritus and soil erosion are the main contributions to POC in the turbidity maximum, especially in the flood season.

  11. The Outer Thames Estuary Regional Environmental Characterisation

    OpenAIRE

    Sturt, Fraser; Dix, Justin K.; EMU Ltd.; University of Southampton

    2009-01-01

    The Outer Thames Estuary Regional Environmental Characterisation (REC) provides an environmental reference statement defining marine and seabed conditions within the study area. Prior to this study, regional environmental assessment of the Outer Thames Estuary was based upon dispersed data acquired over several decades. The Marine Aggregate Levy Sustainability Fund (MALSF) has provided the opportunity to acquire and interpret an integrated physical and biological dataset for the first time in...

  12. Diet-induced developmental plasticity in life histories and energy metabolism in a beetle La dieta induce plasticidad del desarrollo en los rasgos de historia de vida y metabolismo energético en un escarabajo

    Directory of Open Access Journals (Sweden)

    SERGIO URREJOLA

    2011-12-01

    Full Text Available Adaptive phenotypic plasticity, has been recognized as an important strategy by which organisms maximize fitness in variable environments, which vary through development. A disassociation among stages should represent a null effect of the environment experienced during early ontogeny in the expression of adult traits. Food quality greatly influences survival, development and reproduction in many arthropod herbivores. We examined the effects of diet protein in physiological and life-history traits in the yellow mealworm beetle Tenebrio molitor through ontogeny. We established four experimental treatments: Low Protein (LP, Low Protein Control (LPC, High Protein (HP, and High Protein Control (HPC with recently eclosioned larvae each. Individuals were maintained on the same diet or transferred to the opposite diet for all pupae period and almost all adult period. Contrary to the expected, the duration of life-cycle, larval growth rate and body mass in T. molitor were similar in diet treatments. We found intra-individual trade-offs between environmental diet (rich or poor in protein content during larval phase and egg number. Larvae fed on a protein-deficient diet exhibited significantly higher respiratory rates than larvae fed on a rich protein diet. Compensatory feeding could act in T. molitor larvae indicating differences in metabolism but not in growth rate, body mass and life-cycle characteristics. Our results demonstrate the plasticity of reproductive and metabolic traits and life-cycle characteristics of T. molitor and how changes that occur in relation to diet can have profound effects on progeny and female fitness.La plasticidad fenotípica adaptativa ha sido reconocida como una estrategia importante por el cual los organismos maximizan su adecuación biológica en ambientes variables y la cual varía a lo largo del desarrollo. En los organismos la plasticidad fenotípica generalmente se refiere a como los diferentes tipos de rasgos pueden

  13. ANSIEDAD, DEPRESIÓN Y RASGOS DE PERSONALIDAD EN PACIENTES CON INSUFICIENCIA VENOSA CRÓNICA PERIFÉRICA

    Directory of Open Access Journals (Sweden)

    L A Carmona-López

    2016-07-01

    Full Text Available Introducción: La Insuficiencia Venosa Crónica Periférica (IVCP es un cambio clínico que se produce como resultado de la dilatación patológica de las venas en los miembros inferiores, de la incompetencia de sus válvulas y de la hipertensión venosa resultante. Pudiera cursar dentro de la categoría de trastornos sistémicos que producen depresión y ansiedad, las cuales a su vez son alteraciones psiquiátricas relacionadas con toda la esfera cardiovascular. Objetivo: Determinar la frecuencia de ansiedad, depresión y su relación con los rasgos de personalidad, en pacientes con Insuficiencia Venosa Crónica Periférica. Metodología: Se realizó un trabajo de tipo descriptivo, de corte transversal. Se utilizó la escala de Hamilton para ansiedad y depresión; la personalidad fue evaluada con el cuestionario Factorial de Personalidad 16 FP de Catell además de otras variables sociodemográficas. Resultados: Se evaluaron 30 pacientes; 93% (N=28 de sexo femenino, 7% (N=2 de sexo masculino diagnosticados. Con edades entre 25 y 74 años; encontrándose 36,7% (N=11 ansiedad severa, seguida de ansiedad menor en 33,3% (N=10. 50% de los pacientes no presentó depresión, y 50% se distribuyó de forma homogénea en leve, moderada y severa. Predominando personalidad que se le dificulta manejar las frustraciones, suelen ser nerviosos o ansiosos ante ciertas circunstancias, suspicaces, inteligentes y leales a nivel grupal. El rasgo de personalidad que predominó en el grupo de estudio es el de tipo ansioso. Conclusión: Los pacientes con insuficiencia venosa crónica periférica tienen inclinación a la ansiedad con dificultades para manejar la frustración. Palabras claves: Insuficiencia venosa, Ansiedad, Depresión, Personalidad

  14. DERECHO AMBIENTAL EN ARGENTINA

    OpenAIRE

    2014-01-01

    El objetivo de la presente publicación es brindar un panorama general, introductorio y actualizado del derecho ambiental argentino. Entendiendo que el derecho ambiental es un signo de nuestra era y que por la dinamicidad de la cuestión ambiental requiere de permanente actualización regularoria. La autora desarrolla en forma objetiva su postura en relación con la necesidad de hacer sostenible al derecho ambiental. Para luego analizar brevemente la situación actual del derecho vigente en Argent...

  15. Rasgos socioculturales de los jóvenes en México: bienestar, cultura y política

    Directory of Open Access Journals (Sweden)

    Luz María Ortega Villa

    2016-01-01

    Full Text Available Con base en dos encuestas nacionales aplicadas por el gobierno mexicano, se presenta un análisis secundario de las bases de datos de la Encuesta Nacional de Juventud 2010 y la Encuesta Nacional de Cultura Política de 2012, para analizar la situación de los jóvenes mexicanos en algunos aspectos de su bienestar y sexualidad, consumo y acceso a bienes culturales, sus interacciones con otros, y la cultura política que practican. A pesar de las limitaciones de la Encuesta Nacional de Juventud 2010 y su aplicación, se delinean algunos rasgos que permiten conocer a las y los jóvenes mexicanos: condición laboral y educativa, patrones de interacción específicos según edad, un marcado sedentarismo, escasas expresiones de la subjetividad, muy poco interés y participación en la política institucional, y la desconfianza hacia sus protagonistas.

  16. Skagit IMW - Skagit River Estuary Intensively Monitored Watershed Project

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study evaluates system-level effects of several estuary restoration projects on juvenile Chinook salmon production in the Skagit River estuary. The monitoring...

  17. Radiactividad y medio ambiente

    OpenAIRE

    Sánchez León, José Guillermo

    1993-01-01

    En los medios de comunicación frecuentemente aparecen noticias que hacen referencia a la radiactividad y al medio ambiente y, sin embargo, lo que es la radiactividad y como influye ésta sobre el medio ambiente suele ser poco conocido, incluso por personas de formación científica.

  18. Teoría de los rasgos: contribución a la teoría del comportamiento del empresario

    Directory of Open Access Journals (Sweden)

    Manuel Gutiérrez Roa

    1992-01-01

    Full Text Available El autor propone un nuevo punto de vista que relaciona la sicología con la Administración de Empresas. Se da una nueva explicación sobre el comportamiento del empresario mediante la formulación de hipótesis basadas en las teorías del comportamiento y en los hechos y actitudes que caracterizan al industrial en su actividad cotidiana. Las hipótesis son: - El empresario tiene una formación valorativa fruto de un proceso de interiorización y maduración del yo, a partir de una formación temprana en este sentido. - El conjunto de valores derivados de la anterior, determina en el individuo un conjunto de rasgos, que orientan su actuación y predominan en su personalidad. Un solo rasgo no tiene valor, es el conjunto el que interesa y explica su comportamiento.

  19. DERECHO AMBIENTAL EN ARGENTINA

    Directory of Open Access Journals (Sweden)

    Silvia Nonna

    2014-05-01

    Full Text Available El objetivo de la presente publicación es brindar un panorama general, introductorio y actualizado del derecho ambiental argentino. Entendiendo que el derecho ambiental es un signo de nuestra era y que por la dinamicidad de la cuestión ambiental requiere de permanente actualización regulatoria. La autora desarrolla en forma objetiva su postura en relación con la necesidad de hacer sostenible al derecho ambiental. Para luego analizar brevemente la situación actual del derecho vigente en Argentina, haciendo un rápido y resumido recorrido desde la última reforma de la Constitución Nacional hasta la consideración especial de cada una de las nuevas normas de presupuestos mínimos de protección ambiental.

  20. Metas de elección de carrera: contribución de los intereses vocacionales, la autoeficacia y los rasgos de personalidad

    OpenAIRE

    Marcos Cupani; Edgardo R. Pérez

    2006-01-01

    En todo proceso de asesoramiento vocacional, incrementar el autoconocimiento en variables psicológicas relevantes en este dominio (intereses, habilidades, rasgos de personalidad) ayuda a los orientados a realizar elecciones satisfactorias. En Argentina se han construido varios instrumentos tales como el Cuestionario de Intereses Profesionales (CIP) de Fogliatto (1991), el Inventario de Autoeficacia para Inteligencias Múltiples (IAMI) de Pérez (2001) y el Sistema de Orient...

  1. Relaciones entre ansiedad escolar, ansiedad rasgo, ansiedad estado y depresión en una muestra de adolescentes españoles

    OpenAIRE

    Martínez-Monteagudo, Mari Carmen; García-Fernández, José Manuel; Cándido J. Inglés

    2013-01-01

    Diferentes estudios han analizado la ansiedad escolar como un constructo unitario sin atender a las diferentes situaciones y sistemas de respuesta que conforman este constructo. El presente estudio considera la ansiedad escolar como un constructo multidimensional y su objetivo fue analizar las relaciones y capacidad predictiva de las situaciones y sistemas de respuesta de la ansiedad escolar sobre la ansiedad rasgo, la ansiedad estado y la depresión. El Inventario de Ansiedad Escolar (IAES), ...

  2. Rasgo dental pliegue acodado en el grupo étnico Wayuú Península de la Guajira - norte de Colombia

    Directory of Open Access Journals (Sweden)

    Luis Alberto Valbuena Guariyú

    2009-07-01

    El rasgo Pliegue Acodado (Deflecktíng WrlnkJe, se manifiesta en el primer molar inferior permanente en la cúspide mesolingual. También se presenta en el segundo y tercer molar, pero su morfología se altera tal como sucede con la morfología de las demás cúspídes.

  3. Prediction in ungauged estuaries: An integrated theory

    Science.gov (United States)

    Savenije, Hubert H. G.

    2015-04-01

    Many estuaries in the world are ungauged. The International Association of Hydrological Sciences completed its science decade on Prediction in Ungauged Basins (PUB) in 2012 (Hrachowitz et al.). Prediction on the basis of limited data is a challenge in hydrology, but not less so in estuaries, where data on fundamental processes are often lacking. In this paper, relatively simple, but science-based, methods are presented that allow researchers, engineers, and water managers to obtain first-order estimates of essential process parameters in estuaries, such as the estuary depth, the tidal amplitude, the tidal excursion, the phase lag, and the salt water intrusion, on the basis of readily obtainable information, such as topographical maps and tidal tables. These apparently simple relationships are assumed to result from the capacity of freely erodible water bodies to adjust themselves to external drivers and to dissipate the free energy from these drivers as efficiently as possible. Thus, it is assumed that these systems operate close to their thermodynamic limit, resulting in predictable patterns that can be described by relatively simple equations. Although still much has to be done to develop an overall physics-based theory, this does not prevent us from making use of the empirical "laws" that we observe in alluvial estuaries.

  4. Tampa Bay Estuary Program and Restore Americas Estuaries to Receive Third Place Gulf Guardian Award in the Partnerships Category

    Science.gov (United States)

    ATLANTA - Today the Gulf of Mexico Program announced that Tampa Bay Estuary Program & Restore America's Estuaries will receive a Third Place 2015 Gulf Guardian Award in the Partnerships Category. The award will be given tonight at an awards ceremony at

  5. Hydrodynamic and Sediment Modelling within a Macro Tidal Estuary: Port Curtis Estuary, Australia

    Directory of Open Access Journals (Sweden)

    Ryan J. K. Dunn

    2015-07-01

    Full Text Available An understanding of sediment transport processes and resultant concentration dynamics in estuaries is of great importance to engineering design awareness and the management of these environments. Predictive modelling approaches provide an opportunity to investigate and address potential system responses to nominated events, changes, or conditions of interest, often on high temporal and spatial resolution scales. In this study, a three-dimensional hydrodynamic model and wave model were validated and applied to generate forcing conditions for input into a sediment transport model for the period 7 May 2010–30 October 2010 within a macro tidal estuary, Port Curtis estuary (Australia. The hydrodynamic model was verified against surface and near-bottom current measurements. The model accurately reproduced the variations of surface and near-bottom currents at both a mid-estuary and upper-estuary location. Sediment transport model predictions were performed under varying meteorological conditions and tidal forcing over a 180-day period and were validated against turbidity data collected at six stations within Port Curtis estuary. The sediment transport model was able to predict both the magnitudes of the turbidity levels and the modulation induced by the neap and spring tides and wind-wave variations. The model-predicted (converted turbidity levels compared favourably with the measured surface water turbidity levels at all six stations. The study results have useful practical application for Port Curtis estuary, including providing predictive capabilities to support the selection of locations for monitoring/compliance sites.

  6. Diferencias en ansiedad estado-rasgo y en atención selectiva en Trastorno por Déficit de Atención con Hiperactividad (TDAH

    Directory of Open Access Journals (Sweden)

    Paloma González-Castro

    2015-01-01

    Full Text Available Uno de los trastornos que más afecta al rendimiento escolar es el Trastorno por Déficit de Atención con Hiperactividad (TDAH. El criterio establecido por el DSM diferencia tres subtipos: inatento, hiperactivo-impulsivo y combinado. Sin embargo, el perfil de este trastorno podría verse alterado por la asociación con otros como la ansiedad. El objetivo de esta investigación es determinar si hay diferentes patrones de atención (selectiva y sostenida y ansiedad (estado y rasgo en los tres subtipos de TDAH. Además, el objetivo es analizar cómo la ansiedad predice el rendimiento de los estudiantes con TDAH en una tarea de atención selectiva. La muestra estaba formada por 220 estudiantes (6-12 años: 56 en el grupo control, 54 con TDAH-Inatento, 53 con TDAH-Hiperactivo impulsivo y 56 con el subtipo combinado. Los resultados obtenidos mostraron que los cuatro grupos resultaban significativamente diferentes en las variables atencionales y en los niveles de ansiedad estado y rasgo. Al mismo tiempo, la ansiedad rasgo predijo el rendimiento en la variable de concentración analizada. Los resultados revelan un nuevo patrón de gran interés de cara a la evaluación diagnóstica objetiva y fiable en el TDAH.

  7. La pluralidad: Rasgo de la subjetividad política y condición para construir el sentido del “entre-nos”

    Directory of Open Access Journals (Sweden)

    Ángela María Urrego Tovar

    2014-11-01

    Full Text Available En el presente artículo se abordará la pluralidad como uno de los rasgos constitutivos y constituyentes de la subjetividad política, desde la tesis central que señala que esta se configura en experiencias biográficas que implican el reconocimiento, la distinción y diferenciación de los sujetos, y que a su vez permite simultáneamente la construcción del sí mismo y del otro y la otra. Además, se buscará dar cuenta de la manera en que dicho rasgo actúa como el núcleo que potencia la emergencia de los demás rasgos (conciencia histórica, resistencia y alteridad que fueron identificados en el estudio del que este articulo hace parte, y de cómo la pluralidad, en el caso particular de uno de los maestros participantes, se convierte en una marca personal que atraviesa y caracteriza su práctica pedagógica.

  8. Prevalencia y variabilidad de ocho rasgos morfológicos dentales en jóvenes de tres colegios de Cali, 2002.

    Directory of Open Access Journals (Sweden)

    Freddy Moreno

    2009-11-01

    Full Text Available Objetivos: Determinar la prevalencia y variabilidad de ocho rasgos morfológicos dentales: incisivos en pala (UI1, cúspide de Carabelli (UM1, reducción del hipocono (UM2, cresta distal del trigónido (LM1, cúspide sexta TAPI (LM1, cúspide séptima TAMI (LM1, pliegue acodado (LM1 y protostílido (LM1. Materiales y métodos: Se realizó un estudio descriptivo transversal cuantitativo para caracterizar la morfología dental mediante el sistema de placas ASU, en 100 jóvenes de ambos sexos pertenecientes al grupo poblacional mestizo, estudiantes de tres colegios de Cali y con edades comprendidas entre los 10 y 18 años. Resultados: Los rasgos de mayor prevalencia fueron la reducción del hipocono y el pliegue acodado. Se apreciaron frecuencias bajas de los incisivos en pala, cúspide de Carabelli, protostílido, cúspide 6, cúspide 7. No se observó en la muestra la cresta distal del trigónido. Los resultados indican que existe bilateralidad en la expresión de los rasgos y que estos no presentan dimorfismo sexual; además la prevalencia de algunos de ellos sugiere que la muestra observada tiene semejanza con el patrón dental caucasoide y preserva algún tipo de influencia del complejo dental mongoloide.

  9. EDUCACIÓN AMBIENTAL Y CIUDADANÍA PLANETARIA

    Directory of Open Access Journals (Sweden)

    María Novo

    2010-01-01

    Full Text Available La emergente utopía de lograr una ciudadanía planetaria, cuyas repercusiones educativas resultan de primer orden, ofrece a la Educación Ambiental un reto y una oportunidad renovadora. La aspiración nos remite al concepto de planetariedad, acuñado a raíz de la alerta de científicos y pensadores sobre los estrechos lazos entre el ser humano y el planeta en su realidad total, no solo física o biosférica sino también histórica y social. Por ello, con frecuencia se ha denominado Era planetaria a la actual etapa histórica, en la cual la interdependencia se revela como un rasgo especialmente significativo que reclama la asociación planetaria de los humanos para afrontar el destino común. En el artículo se proponen algunas pautas para que la Educación Ambiental pueda dar respuesta al desafío y contribuir a la construcción de una sociedad cada vez más compleja y globalizada pero, también, crecientemente sostenible; que camine por senderos de comprensión recíproca y tolerancia, y, a la vez, consciente de la propia e ineludible ecodependencia, se comprometa con el valor intrínseco de lo vivo y la preservación de la vida en todas sus manifestaciones.

  10. Dissolved Trace Metals in the Tay Estuary

    Science.gov (United States)

    Owens, R. E.; Balls, P. W.

    1997-04-01

    Dissolved trace metals have been studied over an annual cycle in the relatively pristine Tay estuary (Scotland). The absence of a major anthropogenic signal has enabled some of the more subtle natural processes controlling trace metal distributions to be identified. Concentration ranges of dissolved metals in the Tay are similar to, or lower than, those observed in more industrialized estuaries. All metals behave non-conservatively in the Tay. Interactions with biogenic and detrital particulate phases are important in controlling dissolved trace metal concentrations. The degradation of organic matter appears to be particularly important for Cu. Removal of dissolved metals was observed in the turbidity maximum zone; a simple model was used to demonstrate that this could be accounted for by adsorption onto suspended particulate matter. At high salinity, coincident peaks of all six metals with ammonia and phosphate are attributed to sewage inputs from Dundee at the mouth of the estuary.

  11. Time-dependence of salinity in monsoonal estuaries

    Digital Repository Service at National Institute of Oceanography (India)

    Vijith, V.; Sundar, D.; Shetye, S.R.

    brought by the runoff mixes with the estuarine water and leaves the estuary. Salinity-ingress, which leads to increase of salinity in the estuary, arises from the following processes: horizontal diffusion, gravity current formation and impact of spring... that year. On 10 August 2007, there was hardly any saline water in the estuary (Figure 3(b)), i.e., the estuary was more like a river that day. Two weeks later, on 24 August 2007, following a lull in the rainfall, salinity intruded into the estuary...

  12. The Design and Development of Online Course Materials: Some Features and Recommendations El diseño y desarrollo de materiales para cursos en línea: algunos rasgos y recomendaciones

    Directory of Open Access Journals (Sweden)

    Liliana Cuesta

    2010-04-01

    Full Text Available This article discusses various features in the design and implementation of online course materials. The author provides a critical review of some instructional design patterns and expands on the alignment among instruction, motivation and learners' performances as part of a curriculum design process. In this context, the author emphasizes the value of permanent analysis and assessment to support an efficient management of online environments in which knowledge construction and interaction find common ground on which to evolve. The author argues in favor of steady and competent efforts to implement varied educational strategies posed both for online instructors and learners. Practical recommendations are espoused for the designers of online courses.Este artículo discute distintos rasgos relacionados con el diseño y el uso de materiales en cursos virtuales. La autora ofrece una reseña crítica de algunos patrones del diseño instruccional y ahonda en la alineación existente entre instrucción, motivación y desempeño de los estudiantes como parte de un proceso de diseño curricular. En este contexto, la autora hace énfasis en el valor que tienen el análisis y la evaluación permanentes para apoyar el manejo eficiente de los ambientes virtuales en los que la construcción de conocimiento y la interacción encuentran un lugar común para su evolución. La autora defiende la idea de hacer esfuerzos constantes y competentes para usar distintas estrategias educativas, planteadas tanto para instructores virtuales como para sus estudiantes. Finalmente, se presentan recomendaciones practicas para los diseñadores de cursos virtuales.

  13. Estuary fish data - Juvenile salmon in migratory corridors of lower Columbia River estuary

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Sampling juvenile salmon and associated fishes in open waters of the lower Columbia River estuary. Field work includes bi-weekly sampling during the spring...

  14. Establishing nursery estuary otolith geochemical tags for Sea Bass (Dicentrarchus labrax): Is temporal stability estuary dependent?

    Science.gov (United States)

    Ryan, Diarmuid; Wögerbauer, Ciara; Roche, William

    2016-12-01

    The ability to determine connectivity between juveniles in nursery estuaries and adult populations is an important tool for fisheries management. Otoliths of juvenile fish contain geochemical tags, which reflect the variation in estuarine elemental chemistry, and allow discrimination of their natal and/or nursery estuaries. These tags can be used to investigate connectivity patterns between juveniles and adults. However, inter-annual variability of geochemical tags may limit the accuracy of nursery origin determinations. Otolith elemental composition was used to assign a single cohort of 0-group sea bass Dicentrarchus labrax to their nursery estuary thus establishing an initial baseline for stocks in waters around Ireland. Using a standard LDFA model, high classification accuracies to nursery sites (80-88%) were obtained. Temporal stability of otolith geochemical tags was also investigated to assess if annual sampling is required for connectivity studies. Geochemical tag stability was found to be strongly estuary dependent.

  15. THE ECOLOGICAL CONDITION OF VERACRUZ, MEXICO ESTUARIES

    Science.gov (United States)

    During June and July, 2002, forty-seven stations were sampled within estuaries along the gulf coast of the state of Veracruz, MX, using a probabilistic survey design and a common set of response indicators. The objective of the study was to collect information to assess the condi...

  16. Restoration of the Golden Horn Estuary (Halic).

    Science.gov (United States)

    Coleman, Heather M; Kanat, Gurdal; Aydinol Turkdogan, F Ilter

    2009-12-01

    Restoration of the iconic Golden Horn Estuary in Istanbul, Turkey was a substantial political, logistical, ecological, and social challenge. Forty years of uncontrolled industrial and urban growth resulted in thick layers of anoxic sediment, toxic bacteria, strong hydrogen sulfide odor, and ecologically unlivable conditions. The major components of restoration, spanning two decades, have included (1) demolition and relocation of industries and homes along the shore, (2) creation of wastewater infrastructure, (3) removal of anoxic sludge from the estuary, (4) removal of a floating bridge that impeded circulation, and (5) creation of cultural and social facilities. Although Turkey is not known as an environmental leader in pollution control, the sum of these efforts was largely successful in revitalizing the area through dramatic water quality improvement. Consequently, the estuary is once again inhabitable for aquatic life as well as amenable to local resource users and foreign visitors, and Istanbul has regained a lost sense of cultural identity. This paper focuses on literature review and personal interviews to discuss the causes of degradation, solutions employed to rehabilitate the estuary, and subsequent physicochemical, ecological, and social changes.

  17. Kaua'i: Streams and Estuaries.

    Science.gov (United States)

    Hawkins, John, Ed.; Murakami, Colleen, Ed.

    Designed to help teachers develop students' awareness and understanding of some of Hawaii's endangered aquatic resources, this module contains activities and instructional suggestions for use with intermediate as well as high school students. The module is divided into two sections which explore the streams and estuaries of Kauai. Activities in…

  18. Padilla Bay: The Estuary Guide. Level 2.

    Science.gov (United States)

    Friesem, Judy; Lynn, Valerie, Ed.

    Estuaries are marine systems that serve as nurseries for animals, links in the migratory pathways, and habitat for a complex community of organisms. This curriculum guide intended for use at the middle school level is designed for use with the on-site program developed by the Padilla Bay National Esturine Research Reserve (Washington). The guide…

  19. Nutrient cycling and foodwebs in Dutch estuaries

    NARCIS (Netherlands)

    Nienhuis, P.H.

    1993-01-01

    In this review several aspects of the functioning of the Dutch estuaries (Ems-Dollard, Wadden Sea, Oosterschelde, Westerschelde, Grevelingen and Veerse Meer) have been compared. A number of large European rivers (especially Rhine) have a prevailing influence on the nutrient cycling of most Dutch est

  20. Mercury in sediments of Ulhas estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Ram, A.; Rokade, M.A.; Borole, D.V.; Zingde, M.D.

    ranges of dissolved (0.04-0.61 mu g l u-1) and particulate (1.13-6.43 mu g g u-1) Hg reveal a definite enhancement of levels in the estuary. The Hg burden in sediment upstream of the weir that limits the tidal influence is low (0.08-0.19 mu g g u-1...

  1. Species-specific variation in the phosphorus nutritional sources by microphytoplankton in a Mediterranean estuary

    Directory of Open Access Journals (Sweden)

    MARLY CAROLINA MARTINEZ SOTO

    2015-08-01

    Full Text Available We investigated the species-specific phosphorus (P nutrition sources in the microphytoplankton community in the Mahon estuary (Minorca, Western Mediterranean in 2011, under two contrasting hydrographic scenarios. Estuarine flow, nutrient concentrations, phytoplankton community composition and enzyme-labeled fluorescence (ELF were measured in June and October, corresponding to the beginning and the end of summer. Dissolved inorganic nitrogen (DIN and inorganic phosphate (Pi exhibited enhanced concentrations in the inner estuary where N:P molar ratios suggested P-limitation in both surveys. Pi was low and variable (0.09±0.02 μmol•l-1 in June and 0.06±0.02 μmol•l-1 in October, whereas organic phosphorus remained a more reliable P source. Even though ambient Pi concentrations were slightly higher on June, when the microphytoplankton assemblage was dominated by dinoflagellates, the percentage of cells expressing ELF labeling was notably higher (65% of total cells than in October (12%, when the presence of diatoms characterized the microphytoplankton community. ELF was mainly expressed by dinoflagellate taxa, whereas diatoms only expressed significant AP in the inner estuary during the June survey. A P-addition bioassay in which response of AP to Pi enrichment was evaluated showed remarkable reduction in AP with increasing Pi. However, some dinoflagellate species maintained AP even when Pi was supplied in excess. We suggest that in the case of some dinoflagellate species AP is not as tightly controlled by ambient Pi as previously believed. AP activity in these species could indicate selective use of organic phosphorus, or slow metabolic response to changes in P forms, rather than physiological stress to low Pi availability. We emphasize the importance of identifying the links between the different P sources and the species-specific requirements, in order to understand the ecological response to anthropogenic biogeochemical perturbations.

  2. Ambient Dried Aerogels

    Science.gov (United States)

    Jones, Steven M.; Paik, Jong-Ah

    2013-01-01

    A method has been developed for creating aerogel using normal pressure and ambient temperatures. All spacecraft, satellites, and landers require the use of thermal insulation due to the extreme environments encountered in space and on extraterrestrial bodies. Ambient dried aerogels introduce the possibility of using aerogel as thermal insulation in a wide variety of instances where supercritically dried aerogels cannot be used. More specifically, thermoelectric devices can use ambient dried aerogel, where the advantages are in situ production using the cast-in ability of an aerogel. Previously, aerogels required supercritical conditions (high temperature and high pressure) to be dried. Ambient dried aerogels can be dried at room temperature and pressure. This allows many materials, such as plastics and certain metal alloys that cannot survive supercritical conditions, to be directly immersed in liquid aerogel precursor and then encapsulated in the final, dried aerogel. Additionally, the metalized Mylar films that could not survive the previous methods of making aerogels can survive the ambient drying technique, thus making multilayer insulation (MLI) materials possible. This results in lighter insulation material as well. Because this innovation does not require high-temperature or high-pressure drying, ambient dried aerogels are much less expensive to produce. The equipment needed to conduct supercritical drying costs many tens of thousands of dollars, and has associated running expenses for power, pressurized gasses, and maintenance. The ambient drying process also expands the size of the pieces of aerogel that can be made because a high-temperature, high-pressure system typically has internal dimensions of up to 30 cm in diameter and 60 cm in height. In the case of this innovation, the only limitation on the size of the aerogels produced would be in the ability of the solvent in the wet gel to escape from the gel network.

  3. Architectural models of ambient-PRISMA in channel ambient calculus

    OpenAIRE

    Ali, Nour; Tuosto, Emilio

    2011-01-01

    peer-reviewed Ambient-PRISMA is an architectural approach for specifying aspect-oriented software architecture and generating code of distributed and mobile systems. Ambient-PRISMA lacks a precise semantics due to the fact that it is based only on a metamodel. In this paper, Ambient-PRISMA is mapped into a formal language called Channel Ambient Calculus, a process algebra for specifying mobile applications that provides channels and ambients as first-class citizens. We...

  4. Dissolved oxygen saturation controls PAH biodegradation in freshwater estuary sediments.

    Science.gov (United States)

    Boyd, T J; Montgomery, M T; Steele, J K; Pohlman, J W; Reatherford, S R; Spargo, B J; Smith, D C

    2005-02-01

    Polycyclic aromatic hydrocarbons (PAHs) are common contaminants in terrestrial and aquatic environments and can represent a significant constituent of the carbon pool in coastal sediments. We report here the results of an 18-month seasonal study of PAH biodegradation and heterotrophic bacterial production and their controlling biogeochemical factors from 186 sediment samples taken in a tidally influenced freshwater estuary. For each sampling event, measurements were averaged from 25-45 stations covering approximately 250 km(2). There was a clear relationship between bacterial production and ambient temperature, but none between production and bottom water dissolved oxygen (DO) % saturation or PAH concentrations. In contrast with other studies, we found no effect of temperature on the biodegradation of naphthalene, phenanthrene, or fluoranthene. PAH mineralization correlated with bottom water DO saturation above 70% (r(2) > 0.99). These results suggest that the proportional utilization of PAH carbon to natural organic carbon is as much as three orders of magnitude higher during cooler months, when water temperatures are lower and DO % saturation is higher. Infusion of cooler, well-oxygenated water to the water column overlying contaminated sediments during the summer months may stimulate PAH metabolism preferentially over non-PAH organic matter.

  5. Rasgos de simplificación en el habla rural de dos localidades de Chile: descripción fonotáctica y discursiva

    Directory of Open Access Journals (Sweden)

    Miriam Elizabeth Cid Uribe

    2008-01-01

    Full Text Available El habla rural de Chile, variedad dialectal recurrente en alrededor del 14% de la población del país, según el último censo nacional, manifiesta rasgos particulares a nivel fonotáctico y discursivo que la caracterizan y la diferencian de otras variedades dialectales recurrentes en el país. Dentro de los aspectos fonotácticos se encuentran simplificaciones segméntales -elisiones, asimilaciones, sinalefas, sinéresis, sustituciones, entre otros- a las que se recurre con mayor o menor frecuencia; en el aspecto discursivo, la presencia y recurrencia de pausas llenas o vacías, las partidas falsas, las repeticiones, el alargamiento segmental se manifiestan en forma constante en esta variedad. En este artículo damos cuenta del comportamiento de los rasgos de simplificación en el habla rural de dos localidades de la Región Metropolitana desde el punto de vista de la manifestación fonotáctica de cada uno de estos rasgos en la elaboración de su discurso semiespontáneo.Chilean rural speech, variety spoken by nearly 14% of the population of the country according to the latest national census, shows specfñcphonotactic and discourse fea-tures which characterise and differentiate itfrom other dialectal varieties found in the country. Segmental simplfñcations like elisión, assimilation, gradation, compression, substitution,amongstothers,are tobe found as recurrentfeaturesat the phonotactic level; at the discourse level, phenomena like pauses -filled or empty-, false starts, repetitions, segmental lengthening are recurrent in this variety. In this article we give an account of the behaviour of such fea tures as they are manifested -phonotactically and discoursally- in two rural communities of the Metropolitan Región at the moment of producing semi spontaneous speech.

  6. Ambient oxygen promotes tumorigenesis.

    Directory of Open Access Journals (Sweden)

    Ho Joong Sung

    Full Text Available Oxygen serves as an essential factor for oxidative stress, and it has been shown to be a mutagen in bacteria. While it is well established that ambient oxygen can also cause genomic instability in cultured mammalian cells, its effect on de novo tumorigenesis at the organismal level is unclear. Herein, by decreasing ambient oxygen exposure, we report a ∼50% increase in the median tumor-free survival time of p53-/- mice. In the thymus, reducing oxygen exposure decreased the levels of oxidative DNA damage and RAG recombinase, both of which are known to promote lymphomagenesis in p53-/- mice. Oxygen is further shown to be associated with genomic instability in two additional cancer models involving the APC tumor suppressor gene and chemical carcinogenesis. Together, these observations represent the first report directly testing the effect of ambient oxygen on de novo tumorigenesis and provide important physiologic evidence demonstrating its critical role in increasing genomic instability in vivo.

  7. Frugivoría y dispersión de semillas por mamíferos carnívoros: rasgos funcionales

    OpenAIRE

    J.P. González-Varo; J.M. Fedriani; López-Bao, J V; J. Guitián; A. Suárez-Esteban

    2015-01-01

    Muchas especies de mamíferos carnívoros (Orden Carnivora) consumen frutos carnosos, transportan semillas en sus tractos digestivos y las defecansin dañarlas en condiciones apropiadas para la germinación. En este artículo, revisamos el conocimiento adquirido sobre este mutualismo en lasúltimas tres décadas, desde que tres trabajos pioneros revelaron la importancia de los carnívoros como dispersores de semillas en ecosistemastemplados. Nos centramos en los rasgos funcionales de los carnívoros c...

  8. Diferencias en ansiedad estado-rasgo y en atención selectiva en Trastorno por Déficit de Atención con Hiperactividad (TDAH)

    OpenAIRE

    Paloma González-Castro; Celestino Rodríguez; Marisol Cueli; Trinidad García; David Álvarez

    2015-01-01

    Uno de los trastornos que más afecta al rendimiento escolar es el Trastorno por Déficit de Atención con Hiperactividad (TDAH). El criterio establecido por el DSM diferencia tres subtipos: inatento, hiperactivo-impulsivo y combinado. Sin embargo, el perfil de este trastorno podría verse alterado por la asociación con otros como la ansiedad. El objetivo de esta investigación es determinar si hay diferentes patrones de atención (selectiva y sostenida) y ansiedad (estado y rasgo) en los tr...

  9. La inteligencia emocional rasgo, la autoeficacia para el liderazgo y su vinculación a procesos afectivos grupales, cognitivos y de desempeño

    OpenAIRE

    Villanueva Sierra, José Juan

    2008-01-01

    El presente estudio explora el papel de la inteligencia emocional rasgo y la autoeficacia para el liderazgo sobre determinados procesos grupales tanto afectivos como cognitivos. A su vez se analiza la repercusión de dichas dinámicas en el rendimiento grupal al llevar a cabo una tarea compleja.La muestra estuvo constituida por 176 estudiantes universitarios, con un promedio de edad de 22 años (17% varones y 83% mujeres). Dichos estudiantes participaron de forma voluntaria en un experimento qu...

  10. Prevalencia y rasgos clínico-patológicos del síndrome de rebdomiolisis de esfuerzo en caballos de Pura Raza Española

    OpenAIRE

    Chamizo Blanco, Verónica Esther

    2016-01-01

    Motivación del estudio. El síndrome de rabdomiólisis de esfuerzo (RE) es el problema neuromuscular más frecuente y una causa habitual de mal rendimiento deportivo de los caballos atléticos, pero no existen estudios amplios y detallados que hayan descrito este trastorno en caballos de Pura raza española (PRE). Finalidad. Describir la prevalencia, los principales factores de riesgo y los rasgos clínico-patológicos de las distintas formas del síndrome de RE en el PR...

  11. Historical changes in the Columbia River Estuary

    Science.gov (United States)

    Sherwood, Christopher R.; Jay, David A.; Bradford Harvey, R.; Hamilton, Peter; Simenstad, Charles A.

    Historical changes in the hydrology, sedimentology, and physical oceanography of the Columbia River Estuary have been evaluated with a combination of statistical, cartographic, and numerical-modelling techniques. Comparison of data digitized from US Coast and Geodetic Survey bathymetric surveys conducted in the periods 1867-1875, 1926-1937, and 1949-1958 reveals that large changes in the morphology of the estuary have been caused by navigational improvements (jetties, dredged channels, and pile dikes) and by the diking and filling of much of the wetland area. Lesser changes are attributable to natural shoaling and erosion. There has been roughly a 15% decrease in tidal prism and a net accumulation of about 68 × 10 6m 3 of sediment in the estuary. Large volumes of sediment have been eroded from the entrance region and deposited on the continental shelf and in the balance of the estuary, contributing to formation of new land. The bathymetric data indicate that, ignoring erosion at the entrance, 370 to 485 × 10 6m 3 of sediment has been deposited in the estuary since 1868 at an average rate of about 0.5 cm y -1, roughly 5 times the rate at which sea level has fallen locally since the turn of the century. Riverflow data indicate that the seasonal flow cycle of the Columbia River has been significantly altered by regulation and diversion of water for irrigation. The greatest changes have occurred in the last thirty years. Flow variability over periods greater than a month has been significantly damped and the net discharge has been slightly reduced. These changes in riverflow are too recent to be reflected in the available in the available bathymetric data. Results from a laterally averaged, multiple-channel, two-dimensional numerical flow model (described in HAMILTON, 1990) suggest that the changes in morphology and riverflow have reduced mixing, increased stratification, altered the response to fortnightly (neap-spring) changes in tidal forcing, and decreased the

  12. Crisis ambiental y cristianismo

    OpenAIRE

    Felipe Cárdenas

    2008-01-01

    En el artículo se identifican y reconocen algunas opciones que se pueden desarrollar en el cristianismo en relación con la problemática ambiental. Se aborda el dilema bíblico suscitado por interpretaciones antiecológicas y ecológicas. Con base en una lectura de la Biblia, de testimonios cristianos, y en una rememoria de estructuras institucionales, como la parroquia, se analiza el valor que tiene el mensaje cristiano en lo referido a la mitigación de la crisis ambiental.This article identifie...

  13. Interpreting the colour of an estuary

    Science.gov (United States)

    Bowers, D. G.; Evans, D.; Thomas, D. N.; Ellis, K.; Williams, P. J. le B.

    2004-01-01

    This paper explores the possibility of using water colour to quantify the concentration of coloured dissolved organic matter (CDOM), and through it, dissolved organic carbon (DOC) and salinity in a turbid estuary in which suspended sediments also influence water colour. The motivation of the work is that the method could be applied to water colour measurements made remotely from an aircraft (or, in larger estuaries, a satellite) enabling near-synoptic mapping of surface salinity and DOC distributions. The paper describes observations at 29 stations distributed along the salinity gradient of the Conwy estuary in North Wales. At each station, surface water samples were collected and analysed for salinity, concentrations of DOC, chlorophyll and suspended particles and absorption spectra of CDOM, or yellow substance. Profiles were made of both upwelling and downwelling irradiance in four narrow band channels, and these were used to calculate irradiance reflection and attenuation coefficients. Results show that spectrally averaged light absorption in the estuary is caused principally and equally by mineral suspended solids and yellow substance, with water and chlorophyll in third and fourth place. The CDOM is strongly correlated ( R2=0.99) in a negative sense with salinity, and more weakly correlated with DOC. There is a linear relationship between CDOM and the ratio of reflection coefficients in the red (670 nm) and blue-green (490 nm) parts of the spectrum, which could be applied to remote sensing; the slope and intercept of the relationship are however different to those found in less turbid water bodies. It is shown that the change in slope and intercept are consistent with the presence, in the Conwy estuary, of suspended particles which influence the water colour. A method is described and tested for inverting water colour measurements in a turbid estuary to give estimates of CDOM in the presence of suspended particles. The solution, which has not been adjusted to

  14. Mesozooplankton affinities in a recovering freshwater estuary

    Science.gov (United States)

    Chambord, Sophie; Maris, Tom; Colas, Fanny; Van Engeland, Tom; Sossou, Akoko-C.; Azémar, Frédéric; Le Coz, Maïwen; Cox, Tom; Buisson, Laetitia; Souissi, Sami; Meire, Patrick; Tackx, Michèle

    2016-08-01

    Water quality of the Scheldt estuary (Belgium/The Netherlands) has considerably improved in recent years, especially in the upstream, freshwater reaches. Within the zooplankton community, the copepod Eurytemora affinis, typically abundant in brackish water and quasi-absent from freshwater before 2007, has since substantially developed in the latter, where it now represents 90% of the crustacean mesozooplankton community. Simultaneously, cyclopoid copepod abundance has greatly decreased, while cladoceran abundance did not change. The study aim was: 1) to verify if the zooplankton community described for the period 2007-2009 by Mialet et al. (2011) has stabilized until present, and 2) to look for the environmental conditions favouring E. affinis development and causing changes in the upstream freshwater zooplankton community. The 2002-2012 temporal evolution of the zooplankton distribution at three stations in the upstream freshwater Scheldt estuary was analyzed. Water quality remained better after 2007 than before, and some factors revealed continuous improvement in annual mean concentrations (e.g. increase in O2, decrease in BOD5 and NH4sbnd N concentration). The increase in oxygen and the decrease in NH4sbnd N concentration, together with low discharge during summer were the main environmental factors explaining the development and timing of E. affinis in the upstream freshwater reach. In this reach, E. affinis maximal abundance is shifted to higher temperatures (summer) compared to its typical maximum spring abundance peak in the brackish zone of the Scheldt estuary and in most temperate estuaries. The changes in zooplankton community followed a temporal and spatial gradient induced by the spatio-temporal evolution of water quality improvement. The most downstream station (3) allowed E. affinis development (oxygen concentration > 4 mg L-1; NH4sbnd N concentration high predation pressure, NH3sbnd N toxicity, sensitivity to oxygen, etc.), there is no clear cause

  15. Ambient mass spectrometry imaging

    DEFF Research Database (Denmark)

    Janfelt, Christian; Nørgaard, Asger W

    2012-01-01

    Easy ambient sonic spray ionization (EASI) and desorption electrospray ionization (DESI) were used for imaging of a number of samples, including sections of rat brain and imprints of plant material on porous Teflon. A novel approach termed Displaced Dual-mode Imaging was utilized for the direct...

  16. La radioactividad ambiental

    OpenAIRE

    Rafael Núñez-Lagos Roglá

    2011-01-01

    Se explican los conceptos fundamentales relacionados con la radiactividad y se utilizan para describir la radiactividad ambiental. Se explican también los isótopos de largo periodo y las principales familias radioactivas junto con la radiación cósmica y los radionucleidos cosmogénicos.

  17. La radioactividad ambiental

    Directory of Open Access Journals (Sweden)

    Rafael Núñez-Lagos Roglá

    2011-01-01

    Full Text Available Se explican los conceptos fundamentales relacionados con la radiactividad y se utilizan para describir la radiactividad ambiental. Se explican también los isótopos de largo periodo y las principales familias radioactivas junto con la radiación cósmica y los radionucleidos cosmogénicos.

  18. Modelling the Physical System of Belawan Estuary

    Science.gov (United States)

    Tarigan, A. P. M.; Swandana, D.; Isma, F.

    2017-03-01

    Belawan estuary represents one of the most complex and fascinating mixed environments of sea and land, where not only habitat of rich biodiversity but also international seaport infrastructure are at stake. It is therefore a matter of considerable importance to understand the physical system which characterizes the dynamics of the estuarine water. The purpose of this study is to model the changing water depths, tidal currents, salt, temperature and sediment concentration over a long stretch of Belawan estuary on an hourly basis. The first essential step is to define the bathymetry based on which other physical parameters are simulated. The study is accomplished by building working computer modules which simplify and model the systems complexities. It should be noted that model validation and improvement is the subject of the next study.

  19. Rasgos de sentido de vida del enfoque de resiliencia en personas mayores entre los 65 y 75 años

    Directory of Open Access Journals (Sweden)

    Flor Jiménez Segura

    2004-01-01

    Full Text Available La resiliencia es la capacidad para activar las fortalezas y proteger la integridad personal al enfrentar adversidades, construyendo a partir de éstas. En este estudio se identificaron los ocho rasgos de sentido de vida según el enfoque de resiliencia (Intereses especiales, Metas, Motivación para el logro, Aspiraciones educativas, Optimismo, Persistencia, Fe y Espiritualidad y Sentido de propósito, que han presentado personas adultas mayores de 65 a 75 años durante sus vidas. Los principios teórico-metodológicos utilizados son los del paradigma cualitativo. Se efectuaron entrevistas en profundidad a cuatro mujeres y cuatro hombres que pertenecen al grupo de Envejecimiento Integral de la Universidad de Costa Rica o a la Asociación Gerontológica Costarricense. Aunque la mayoría de las personas adultas mayores participantes en el estudio no identificaron metas claras en la actualidad, durante sus vidas contaron con las condiciones y herramientas personales que contribuyeron con el desarrollo de los rasgos de sentido de vida del enfoque de resiliencia.

  20. Análisis factorial exploratorio del Inventario de Depresión Estado-Rasgo (ST-DEP en adolescentes

    Directory of Open Access Journals (Sweden)

    César Merino Soto

    2012-01-01

    Full Text Available El Inventario de Depresión Estado-Rasgo (IDER evalúa de forma breve distintos síntomas depresivos. El objetivo es evaluar algunas propiedades psicométricas del IDER en Perú. La muestra estuvo formada por 314 estudiantes entre 11 y 18 años de secundaria en un colegio limeño. Los resultados indican una estructura bidimensional –que corresponde con la delimitación conceptual del inventario original–. Sin embargo, algunos ítems presentaron cargas comparativamente bajas, probablemente debido a variaciones culturales. Adicionalmente, la consistencia interna para la dimensión de Estado y Rasgo presentó valores alfa de Cronbach de 0.76 y 0.68, respectivamente. El cuestionario IDER satisface el criterio de invariabilidad de la estructura interna y puede dar una alternativa favorable para el diagnóstico y evaluación de la depresión en adolescentes peruanos.

  1. De campesinos a pequeños agro empresarios: Nuevos rasgos de las organizaciones en Costa Rica 1992-2001

    OpenAIRE

    Franceschi Barraza, Hannia

    2008-01-01

    Se analiza las acciones colectivas de algunas organizaciones campesinas costarricenses en la década 1992-2001, destacando las principales reivindicaciones, las formas organizativas, los cambios en la dimensión ambiental y en la participación de las mujeres. El articulo se basa en una investigación de tipo descriptivo- analítico, guiada por el enfoque metodológico cualitativo. Se emplearon técnicas como la entrevista semi estructurada, aplicada a tres representantes de organizaciones nacionale...

  2. Ambient Air Quality Data Inventory

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Office of Air and Radiation??s (OAR) Ambient Air Quality Data (Current) contains ambient air pollution data collected by EPA, other federal agencies, as well as...

  3. Ambient Air Quality Data Inventory

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Office of Air and Radiation's (OAR) Ambient Air Quality Data (Current) contains ambient air pollution data collected by EPA, other federal agencies, as well as...

  4. Current Characterization at the Amazon estuary

    Science.gov (United States)

    Bezerra, M. O.

    2009-04-01

    At the estuary there are several mechanisms that cause turbulence: influence of solid contours (estuary bottom and shores), speed vertical shearing (fluid inside), wind shearing stress (free surface) and surface and internal gravity waves. Turbulence intensity controls vertical distribution of estuary water mass property concentration. As flow into the estuary takes place during the transition or turbulent regimen, produced by small space and time scale movements, entrainment, turbulent scattering and advection are the processes responsible for fresh water mixing up with the sea and for local salinity variation, as well as for concentration of natural properties and man-made ones. According to this focus, we shall describe general circulation, conveyance and mixing characteristics of the Amazon low estuary waters. Amazon estuary shows unusual characteristics: it is of vast length and enormous outflow. It is extremely wide - 150 Km - and its discharge into the Atlantic amounts to 180,000 m3s-1 (Otman, 1968, Figueiredo et al, 1991), which means 18% of all water discharged by rivers into oceans; this is the largest punctual source of fresh water for oceans (Milliman and Meade, 1983). Maximum outflow is 2.5 x 105 m3s-1, and it happens at the end of May. Minimum outflow is 1.2 x 105 m3 s-1, and it takes place in November. At Amazon River, the Mixing Zone occurs where the Coastal Zone usually is. The reason for that is the extension of fresh water plume moves Northeast for over 1000 Km (Gibbs, 1970; Muller-Karger et al 1988). This is the most extensive estuarine plume ever found in the ocean. During low fluvial discharge (June-November) plume reaches 300 Km; however, on high discharge (November-May) plume reaches 500 Km. Plume already is 3 to 10 m thick and 80 to 300 Km wide (Lentz and Limeburner, 1995). From June to January plume moves towards Africa, from whence 70% of it goes east carried by North Brazil Current retroflection and 30% goes towards the Caribbean. From

  5. Medio ambiente urbano

    OpenAIRE

    2009-01-01

    El estudio  y análisis  de las interacciones  entre  ambiente  y desarrollo y  su inserción  en los procesos  de  planificación del crecimiento  social y económico  de  los  países  de América Latina, reviste especial interés para proponer alternativas de acción que  conduzcan  al  logro  de  una mejor  calidad de  vida.  El impacto  que las conferencias sobre  el  Medio Ambiente Humano Estocolmo (1972),  Cocoyoc  (1974) o de documentos como "Nuestro Futuro Común" o "Nuestra Propia Agenda" ha...

  6. NIF Ambient Vibration Measurements

    Energy Technology Data Exchange (ETDEWEB)

    Noble, C.R.; Hoehler, M.S., S.C. Sommer

    1999-11-29

    LLNL has an ongoing research and development project that includes developing data acquisition systems with remote wireless communication for monitoring the vibrations of large civil engineering structures. In order to establish the capability of performing remote sensing over an extended period of time, the researchers needed to apply this technology to a real structure. The construction of the National Ignition Facility provided an opportunity to test the data acquisition system on a large structure to monitor whether the facility is remaining within the strict ambient vibration guidelines. This document will briefly discuss the NIF ambient vibration requirements and summarize the vibration measurements performed during the Spring and Summer of 1999. In addition, a brief description of the sensors and the data acquisition systems will be provided in Appendix B.

  7. Ambient temperature recorder

    Science.gov (United States)

    Russell, Larry D.

    1991-01-01

    A temperature data recorder, designated the Ambient Temperature Recorder (ATR-4), was developed at NASA Ames Research Center to meet particular requirements for space life sciences experiments. The small, self-contained, four-channel, battery-powered device records 32 kilobytes of temperature data over a range of -40 to +60 C at four sampling intervals ranging from 1.875 to 15 minutes. Data is stored in its internal electronic memory for later readout by a personal computer.

  8. "Coeficientes de herencia, correlaciones, repetibilidad e índice de selección de rasgos reproductivos en porcinos"

    Directory of Open Access Journals (Sweden)

    Arango B. Humherto

    1989-12-01

    fueron: a Hermanos medios: PN =0.38, P 21 = 0.23, PD.=0.41, NN =0.23, N21 =0.17, ND=tl.27, 121 = 1.54,156=0.38, PCN =0.75,PC21 = 0.13, PCD =0.41 (PC = peso de la camada. b Por, regresión: PN=0.21, P21 =0.33, PD=0.23, NN =0.32, N21= 0.19, ND=0.39, 121 =0.53,1-56=0.41. Las correlaciones genéticas y fenotípicas calculadas se pueden considerar entre bajas y medias, con algunas de sentido opuesto. Las repetibilidades resultaron altas, por ser las h2 altas. Los índices calculados involucraron dos y tres variables (PN, PD e 156 días. 1a=37 X 1 + 1633 X2 + 22209Xs Ib = 0.34 Xl + 18 X2. El avance genético resultan1e de la aplicación del índice para dos variables fue de 5.3 % mayor para peso al nacer y 342 % para peso al destete. Para el de tres variables fue de 34 % para peso al nacer y 419 % para peso al destete y 311 para incremento de peso  más que el avance por selección de rasgos individuales.

  9. Comparative-Study of the Hyperbenthos of 3 European Estuaries

    NARCIS (Netherlands)

    Mees, J.; Fockedey, N.; Hamerlynck, O.

    1995-01-01

    The hyperbenthic fauna of the subtidal channels of the Eems (N. Netherlands), Westerschelde (S.W. Netherlands), and Gironde (S.W. France) estuaries was sampled within a 15-day period in summer 1991. In each estuary, quantitative samples were taken at regularly spaced stations covering the entire sal

  10. Snohomish Estuary Wetlands Study. Volume IV. Delineation of Wetland Boundaries

    Science.gov (United States)

    1978-08-01

    River FIG. 4 -G. 5 CARNATION [] Scale in Miles 0 5 1 FALL CITY SNOHOMISH ESTUARY WETLANDS STUDY 8AOUAH FIG. 6-/ 44 Isan A EVRT 12 1 land NO4Carnation on the Snoqualmie River (Tolt River confluence). I B. OBJECTIVES 8. The objectives of the overall Snohomish Estuary Wetlands

  11. Rasgos morfosedimentarios, procesos y evolución de la plataforma continental Argentina desde el último máximo glacial

    Directory of Open Access Journals (Sweden)

    Roberto A Violante

    2014-06-01

    Full Text Available La plataforma continental argentina es una de las plataformas submarinas más extensas del mundo, localizada en un contexto geotectónico dominado por un margen continental pasivo, aunque en su porción más austral se asocia a sectores de márgenes activos. Su extensión y escaso relieve han favorecido un profundo efecto modelador producto de las sucesivas transgresiones y regresiones marinas del Cuaternario, que le imprimieron variados rasgos morfosedimentarios. La transgresión postglacial dejó los rasgos finales que pueden ser reconocidos en las características superficiales y subsuperficiales, como ser las terrazas escalonadas asociadas a variaciones en la velocidad de ascenso del nivel del mar así como evidencias de paleolíneas de costas hoy sumergidas. Numerosos rasgos demuestran aspectos de la exposición subaérea durante el Último Máximo Glacial, como relictos de redes fluviales, depósitos glacifluviales y remanentes de suelos. La acción conjunta de los procesos actuantes favoreció la redistribución de los sedimentos aportados por la erosión de las sucesivas líneas de costas durante los avances y retrocesos marinos, además de aquellos incorporados desde el continente por acción eólica y fluvial. De esta manera, la cobertura sedimentaria resultante es terrígena de tipo relíctico y palimpséstico. Las características del borde exterior de la plataforma en transición al talud demuestran complejos procesos tanto litorales (durante etapas de bajo nivel del mar como profundos (erosión retrocederte asociada a la dinámica de cañones submarinos, mientras que la disposición diferente de las terrazas entre los sectores bonaerense y patagónico de la plataforma estaría asociada a ajustes hidroisostáticos.

  12. Seasonal stratification and property distributions in a tropical estuary (Cochin estuary, west coast, India)

    Digital Repository Service at National Institute of Oceanography (India)

    Shivaprasad, A.; Vinita, J.; Revichandran, C.; Reny, P.D.; Deepak, M.P.; Muraleedharan, K.R.; NaveenKumar, K.R.

    introduction, 2nd Edn., John Wi- ley and Sons, Sydney, 1997. Geyer, W. R. and David, M. F.: Tide-Induced Variation of the Dy- namics of a Salt Wedge Estuary, J. Phys. Oceanogr., 19, 1060– 1072, 1989. Government of Kerala, General features, http...

  13. A note on salt intrusion in funnel-shaped estuaries: Application to the Incomati estuary, Mozambique

    Science.gov (United States)

    Brockway, Rachel; Bowers, David; Hoguane, Antonio; Dove, Veronica; Vassele, Valentina

    2006-01-01

    Salt intrusion in estuaries is important for ecological reasons as well as water extraction purposes. The distance salt intrudes upstream depends on a number of factors, including river discharge, tidal and wind mixing and gravitational circulation. In this paper, an analytical solution is presented for the salt intrusion in a well mixed, funnel-shaped estuary whose cross sectional area decreases exponentially (with decay coefficient β) with distance, x, inland, and in which longitudinal mixing is constant along the length of the estuary. The solution predicts that a graph of the logarithm of salinity against exp ( βx) should be a straight line, with slope proportional to the mixing coefficient K x. The solution is tested against observations from 15 surveys over a four-year period in the Incomati estuary. Good straight line fits, as predicted, are observed on all surveys, with a mean R2 = 0.97. The average value of K x for all surveys is 38 m 2 s -1. The solution is used to make predictions about the minimum river flow required to prevent salt intruding to an extent where it causes a detrimental effect on water extraction. The minimum recommended river flow required to prevent this is 35 m 3 s -1. In recent years, flow has fallen below this level for several months each year.

  14. Greenhouse gas (N2O emission from Portuguese estuaries

    Directory of Open Access Journals (Sweden)

    Célia Gonçalves

    2014-07-01

    Tagus, Minho and Lima estuaries are source of N2O to the atmosphere. Particularly, in Lima estuary anthropogenic N input seems to play an important role on N2O emission. However, in a global perspective N2O attained emissions represent a reduced fraction (2O yr-1, Barnes and Upstill-Goddard, 2011. Values are comparable with those registered in some Portuguese estuaries and other European less eutrophic estuaries. However, it is known that higher N2O emissions in estuaries may occur during winter and spring (Sun et al., 2014. Thus, these systems may represent on an annual basis a larger source of N2O, which can only be clarified in future studies. Only a full comprehension of the global estuarine nitrogen cycle will provide an efficient basis of scientific knowledge for sustainably management of such ecosystems and ultimately reduce N2O emissions.

  15. Ambient og intelligent teknologi

    DEFF Research Database (Denmark)

    Andersen, Peter Bøgh

     Dette notat handler om hvordan humanistisk og samfundsfaglig forskning i øjeblikket nyttiggøres ved udformning af IKT-anvendelser, der er indlejret i vor dagligdag i den forstand, at de indgår som et element i de aktiviteter, vi foretager på arbejdet eller i fritiden. Sådanne anvendelser kaldes ...... undertiden ambiente – noget der omslutter os på alle sider. Rapporten peger også på virkemidler som kan forbedre og øge en humanistisk og samfundsfaglig forskningsindsats....

  16. AOX y medio ambiente.

    OpenAIRE

    1996-01-01

    Los productos organohalogenados son muy utilizados por la industria y su presencia en el medio ambiente está siendo controlada. En los últimos años se han desarrollado varias técnicas de detección, siendo desde finales de los 80 los AOX (adsorbable organic halogens) uno de los parámetros sobre los que se han realizado más estudios. En muchos paises de la Unión Europea y en E.E.U.U. de América, la presencia de compuestos organohalogenados en aguas continentales y suelos está legislada indicand...

  17. El proceso de la apropiación: un rasgo distintivo en la educación energética

    Directory of Open Access Journals (Sweden)

    Ernesto Ramón Ávila-Guerra

    2012-01-01

    Full Text Available Al proponer la conceptualización de la Educación Energética para el Desarrollo Sostenible, se destacó como un rasgo esencial el proceso de apropiación del contenido y de esta forma se contribuyó a la teoría pedagógica del Desarrollo Sostenible, como complemento de las prioridades de las Cumbres de la Tierra, los llamamientos realizados por la Asamblea General de las Naciones Unidas y la UNESCO para implementar el Decenio de la Educación para el Desarrollo Sostenible en los sistemas educativos. También, se favoreció el aprendizaje de los contenidos con potencialidades para esta educación en el área de Ciencias Exacta del nivel medio superior.

  18. Rasgos de la cultura política de los indígenas en México. Una revisión a inicios del siglo XXI

    Directory of Open Access Journals (Sweden)

    Rafael Cedillo Delgado

    2009-01-01

    Full Text Available En este trabajo se analizan los rasgos de cultura política que manifiestan los indígenas de México. A través de la revisión de su percepción sobre la política, de la forma como se relacionan con las estructuras de poder y de su participación en los asuntos públicos, se argumenta que éstos manifiestan una peculiar forma de cultura política, caracterizada por la conformación de una organización política comunal y de autogestión, desarrollada en forma paralela a los modos tradicionales de organización política institucional: la partidista-electoral.

  19. La conexión de algunos rasgos geológicos y geomorfológicos con la tectónica

    OpenAIRE

    2012-01-01

    Los rasgos de la superficie de la tierra son producto de dos tiposde procesos: exógenos y endógenos. Los procesos exógenos son causados por la acción del viento, del agua y del hielo; su carácter es aleatorio.  Los procesos endógenos son causados por la acción del campo de los esfuerzos tectónicos; su carácter es sistemáticoo no-aleatorio.  A la inversa, es posible determinar el campo de esfuerzos tectónicos, a partir de los fenómenos causados por él. Para determinarlos, es menester separar, ...

  20. Permanencia del Pan como gobierno municipal de León, Gto. 1988 - 2006. Rasgos de la hegemonía del poder local

    OpenAIRE

    Mora-Alva, Arturo

    2011-01-01

    El Partido Acción Nacional ha gobernado el municipio de León, Guanajuato desde 1988 a la fecha. En este periodo, el PAN logró ser gobierno en el estado de Guanajuato y en el año 2000 ganó la presidencia de la república. En ese contexto, se hizo una investigación para buscar comprender e interpretar: cómo fue que el PAN llegó al gobierno municipal de León, y cuáles son los rasgos propios de la cultura política de León en el periodo de 1988 a 2006. Se realizaron 16 entrevistas con acto...

  1. Indian estuaries: Dynamics, ecosystems, and threats

    Digital Repository Service at National Institute of Oceanography (India)

    Shetye, S.R.

    stream_size 25327 stream_content_type text/plain stream_name Natl_Acad_Sci_Lett_34_229p.pdf.txt stream_source_info Natl_Acad_Sci_Lett_34_229p.pdf.txt Content-Encoding UTF-8 Content-Type text/plain; charset=UTF-8 LEAD... on its salinity field can be seen in the annual cycle of salinity variation shown in Fig. 5 which is based on data recorded during a year, June 2007 - May 2008 On 1st June 2007, before onset of the ISM that year, salinity within the estuary was close...

  2. Mantenimiento o sustitución de rasgos lingüísticos indexados socialmente: migrantes de zonas andinas en Lima

    Directory of Open Access Journals (Sweden)

    Carola Mick

    2013-12-01

    Full Text Available ResumenEste artículo investiga la relación entre la formación de “mundos de vida comunicativos individuales” y la construcción de la identidad en migrantes peruanas procedentes de la zona de los Andes en Lima. A partir del análisis lingüístico y discursivo de un corpus de entrevistas semidirigidas con veintidós mujeres migrantes mostramos cómo las ideologías lingüísticas, las que menosprecian rasgos dialectales considerados como típicos de migrantes andinos y las que prestigian los “rasgos limeños”, condicionan el comportamiento lingüístico de las migrantes y se transforman en herramientas útiles para el posicionamiento discursivo individual de las informantes frente a estos estereotipos.AbstractThis article enquires the relationship between the formation of “individual communicative lifeworlds” and the construction of identity in 22 semidirective interviews with Peruvian migrant domestic workers in Lima originating from the Andean regions. With the help of a combined linguistic and discursive analysis we demonstrate the way in which language ideologies condition and enable the formation of individual communicative lifeworlds of the speakers. The stigmatization of linguistic characteristics that are considered as typical of “Andean” speakers and the high esteem of linguistic forms considered as typical for people originating in Lima favour linguistic accommodation, but in order to explain all the variation in the corpus we need to take into consideration the individual linguistic and discursive positioning of each speaker.

  3. Sucesiones primarias en páramo: patrones de diversidad, rasgos de historia de vida y su relación con nutrientes (Parque Nacional Natural Chingaza

    Directory of Open Access Journals (Sweden)

    Cobos Acosta Raquel

    2002-06-01

    Full Text Available Se realizó un estudio de sucesiones primarias sobre roca en el páramo de Chingaza (Alto delIndio teniendo en cuenta los patrones de diversidad, rasgos de historias de vida y nutrientes.Se trabajaron dos rocas, cada una dividida en cuatro sectores. El sector uno está en la partesuperior de la roca, donde la pendiente es de 75% y la roca está más expuesta, en los siguientes7070Resúmenes sectores la pendiente y la roca desnuda disminuyen hasta llegar al sector cuatro, donde la pen-diente es de 25% y la cobertura del la roca es de 100%. Se evaluó la composición y abundanciade las especies, con los métodos de punto centrado, línea intercepto y cuadrantes. El métodode cuadrantes registró un mayor número de especies (riqueza en todos los sectores. Se encon-tró que las áreas más diversas están hacia la mitad de la roca, (sector 3 - roca 1 o sector 2 -roca 2, mientras que los sectores menos diversos están hacia los extremos superiores (sector1 -roca 1 o inferiores (sector 4 -roca 2 de los sitios de trabajo. El análisis de correspondenciamostró que las especies relacionadas con los sectores 1 y 2 son principalmente criptógamas.Las especies relacionadas en el sector tres son tanto criptógamas como fanerógamas, y en elsector cuatro se agrupan principalmente las especies fanerógamas. Se plantea un modelo con-ceptual del proceso sucesional primario teniendo en cuenta los rasgos de historias de vida y losfactores que dirigen la sucesión en sus diferentes estados.

  4. Crisis ambiental y cristianismo

    Directory of Open Access Journals (Sweden)

    Felipe Cárdenas

    2008-01-01

    Full Text Available En el artículo se identifican y reconocen algunas opciones que se pueden desarrollar en el cristianismo en relación con la problemática ambiental. Se aborda el dilema bíblico suscitado por interpretaciones antiecológicas y ecológicas. Con base en una lectura de la Biblia, de testimonios cristianos, y en una rememoria de estructuras institucionales, como la parroquia, se analiza el valor que tiene el mensaje cristiano en lo referido a la mitigación de la crisis ambiental.This article identifies and recognizes some options that can be developed in Christianity in relation to the environmental problem. It starts by analyzing the biblical dilemma provoked by both ecological and antiecological interpretations. Based on a reading of the Bible, testimonies from Christians and with a rememory of institutional structures, like the parish, the valué of the Christian message for mitigating the environmental crisis is analyzed.

  5. Mercury distribution in Douro estuary (Portugal)

    Energy Technology Data Exchange (ETDEWEB)

    Ramalhosa, E. [Department of Chemistry, University of Aveiro, 3810-193 Aveiro (Portugal); Pereira, E. [Department of Chemistry, University of Aveiro, 3810-193 Aveiro (Portugal)]. E-mail: eduper@dq.ua.pt; Vale, C. [National Institute for Agronomy and Fishery Research, IPIMAR, Avenida Brasilia, 1449-006 Lisboa (Portugal); Valega, M. [Department of Chemistry, University of Aveiro, 3810-193 Aveiro (Portugal); Monterroso, P. [Department of Chemistry, University of Aveiro, 3810-193 Aveiro (Portugal); Duarte, A.C. [Department of Chemistry, University of Aveiro, 3810-193 Aveiro (Portugal)

    2005-11-15

    Determinations of dissolved reactive and total dissolved mercury, particulate and sedimentary mercury, dissolved organic carbon (DOC), particulate organic carbon (POC) and suspended particulate matter (SPM) have been made in the estuary of river Douro, in northern Portugal. The estuary was stratified by salinity along most of its length, it had low concentrations of SPM, typically <20 mg dm{sup -3}, and concentrations of DOC in the range <1.0-1.8 mg dm{sup -3}. The surface waters had a maximum dissolved concentration of reactive mercury of about 10 ng dm{sup -3}, whereas for the more saline bottom waters it was about 65 ng dm{sup -3}. The surface waters had maximum concentrations of total suspended particulate mercury of {approx}7 {mu}g g{sup -1} and the bottom waters were always <1 {mu}g g{sup -1}. Concentrations of mercury in sediments was low and in the range from 0.06 to 0.18 {mu}g g{sup -1}. The transport of mercury in surface waters was mainly associated with organic-rich particulate matter, while in bottom waters the dissolved phase transport of mercury is more important. Lower particulate organic matter, formation of chlorocomplexes in more saline waters and eventually the presence of colloids appear to explain the difference of mercury partitioning in Douro estuarine waters.

  6. Mercury distribution in Douro estuary (Portugal).

    Science.gov (United States)

    Ramalhosa, E; Pereira, E; Vale, C; Válega, M; Monterroso, P; Duarte, A C

    2005-11-01

    Determinations of dissolved reactive and total dissolved mercury, particulate and sedimentary mercury, dissolved organic carbon (DOC), particulate organic carbon (POC) and suspended particulate matter (SPM) have been made in the estuary of river Douro, in northern Portugal. The estuary was stratified by salinity along most of its length, it had low concentrations of SPM, typically <20 mg dm(-3), and concentrations of DOC in the range <1.0-1.8 mg dm(-3). The surface waters had a maximum dissolved concentration of reactive mercury of about 10 ng dm(-3), whereas for the more saline bottom waters it was about 65 ng dm(-3). The surface waters had maximum concentrations of total suspended particulate mercury of approximately 7 microg g(-1) and the bottom waters were always <1 microg g(-1). Concentrations of mercury in sediments was low and in the range from 0.06 to 0.18 microg g(-1). The transport of mercury in surface waters was mainly associated with organic-rich particulate matter, while in bottom waters the dissolved phase transport of mercury is more important. Lower particulate organic matter, formation of chlorocomplexes in more saline waters and eventually the presence of colloids appear to explain the difference of mercury partitioning in Douro estuarine waters.

  7. SEDIMENT TRANSPORT IN YALU RIVER ESTUARY

    Institute of Scientific and Technical Information of China (English)

    GAO Jian-hua; GAO Shu; CHENG Yan; DONG Li-xian; ZHANG Jing

    2003-01-01

    Tidal cycle measurements of tidal currents, salinity and water temperature, and suspended sediment conc entra-tions were measured at four stations, together with surveys along two profiles short core collection within the Yalu River estuary.Grain size analysis of the three core sediment showed that: 1) the sediment from B1 to B3 became finer, worse sorting andpositively skewed; 2) the diversification of matter origin became more and more evident from east to west; 3) the sediments overthe region were of the same origin, as indicated by their similar colors and grain sizes. The data indicated that stratiticationoccurred in the flood season, from upstream to downstream, and a salt wedge was formed. The water column was well mixed, butthe longitudinal gradient of the salinity was larger on spring tide. The results also showed that the dominating mechanisnt ofsuspended sediment transport in the Yalu River estuary was T1, T2, T3 and T5. The non-tidal steady advection transport wasrestricted by the net transport of suspended sediment induced by mass Stoked drift directed to landwards, then the net sedimenttransport rate were decreased and the turbidity maxima was also favored to forming and extending.

  8. Types for BioAmbients

    Directory of Open Access Journals (Sweden)

    Sara Capecchi

    2010-02-01

    Full Text Available The BioAmbients calculus is a process algebra suitable for representing compartmentalization, molecular localization and movements between compartments. In this paper we enrich this calculus with a static type system classifying each ambient with group types specifying the kind of compartments in which the ambient can stay. The type system ensures that, in a well-typed process, ambients cannot be nested in a way that violates the type hierarchy. Exploiting the information given by the group types, we also extend the operational semantics of BioAmbients with rules signalling errors that may derive from undesired ambients' moves (i.e. merging incompatible tissues. Thus, the signal of errors can help the modeller to detect and locate unwanted situations that may arise in a biological system, and give practical hints on how to avoid the undesired behaviour.

  9. Types for BioAmbients

    CERN Document Server

    Capecchi, Sara; 10.4204/EPTCS.19.7

    2010-01-01

    The BioAmbients calculus is a process algebra suitable for representing compartmentalization, molecular localization and movements between compartments. In this paper we enrich this calculus with a static type system classifying each ambient with group types specifying the kind of compartments in which the ambient can stay. The type system ensures that, in a well-typed process, ambients cannot be nested in a way that violates the type hierarchy. Exploiting the information given by the group types, we also extend the operational semantics of BioAmbients with rules signalling errors that may derive from undesired ambients' moves (i.e. merging incompatible tissues). Thus, the signal of errors can help the modeller to detect and locate unwanted situations that may arise in a biological system, and give practical hints on how to avoid the undesired behaviour.

  10. Geographic signatures of North American West Coast estuaries

    Science.gov (United States)

    Emmett, Robert; Llansó, Roberto; Newton, Jan; Thom, Ron; Hornberger, Michelle; Morgan, Cheryl; Levings, Colin; Copping, Andrea; Fishman, Paul

    2000-01-01

    West Coast estuaries are geologically young and composed of a variety of geomorphological types. These estuaries range from large fjords to shallow lagoons; from large to low freshwater flows. Natural hazards include E1 Niños, strong Pacific storms, and active tectonic activity. West Coast estuaries support a wide range of living resources: five salmon species, harvestable shellfish, waterfowl and marine birds, marine mammals, and a variety of algae and plants. Although populations of many of these living resources have declined (salmonids), others have increased (marine mammals). West Coast estuaries are also centers of commerce and increasingly large shipping traffic. The West Coast human population is rising faster than most other areas of the U.S. and Canada, and is distributed heavily in southern California, the San Francisco Bay area, around Puget Sound, and the Fraser River estuary. While water pollution is a problem in many of the urbanized estuaries, most estuaries do not suffer from poor water quality. Primary estuarine problems include habitat alterations, degradation, and loss; diverted freshwater flows; marine sediment contamination; and exotic species introductions. The growing West Coast economy and population are in part related to the quality of life, which is dependent on the use and enjoyment of abundant coastal natural resources.

  11. Reforma constitucional y ambiente

    Directory of Open Access Journals (Sweden)

    Teodoro Bustamante

    2013-09-01

    Full Text Available América Latina está atravesada por una ola de reformas constitucionales. Sus causas, las expectativas que ellas despiertan, los riesgos que se han asociado al proceso de lucha política en su entorno, son temas de un análisis fundamentalmente político; pero hay algunos aspectos en los cuales ese debate tiene una directa repercusión sobre el tema ambiental. En el caso del Ecuador, esto se refleja en el hecho de que una de las innovaciones que se proponen, se refieren a una nueva forma de abordar los temas ambientales, básicamente se establecen Derechos de la Naturaleza.

  12. Salt intrusion study in Cochin estuary - Using empirical models

    Digital Repository Service at National Institute of Oceanography (India)

    Jacob, B.; Revichandran, C.; NaveenKumar, K.R.

    . This describes the mixing processes reasonably well near the mouth, in the central regimes and near the toe of the salt intrusion curve in an estuary. Darcy-Weisbach friction factor f, is calculated using equation (f = 8g/C2) and the value is 0.008, where C... on hydrodynamics, estuaries are classified as sharply stratified, partially stratified and well mixed. Sharply stratified estuaries exhibit little mixing between the salt wedge and freshwater flow and tidal action is not sufficient to mix the separate layers...

  13. Seasonal Patterns in the Fish and Crustacean Community of a Turbid Temperate Estuary (Zeeschelde Estuary, Belgium)

    Science.gov (United States)

    Maes, J.; Taillieu, A.; Van Damme, P. A.; Cottenie, K.; Ollevier, F.

    1998-08-01

    Fish and crustaceans were sampled for 1 year in the upper reaches of a temperate estuary characterized by high turbidity and a tidal range of up to 5 m. Samples were taken in the cooling-water circuit of the Doel Nuclear Power station (Zeeschelde, Belgium). Between July 1994 and June 1995, 55 fish species, two shrimp species and four crab species were recorded. The fish community was composed of 36 marine species, 16 freshwater species and three diadromous species. Shrimps, Gobiidae and Clupeidae dominated the samples both in numbers and biomass. An exceptionally clear seasonal succession was observed in the species composition. It is argued that young fish and crustaceans use the highly turbid Zeeschelde Estuary as a refuge from predators.

  14. CCN activation of ambient and "synthetic ambient" urban aerosol

    Science.gov (United States)

    Burkart, Julia; Reischl, Georg; Steiner, Gerhard; Bauer, Heidi; Leder, Klaus; Kistler, Magda; Puxbaum, Hans; Hitzenberger, R.

    2013-05-01

    In this study, the Cloud Condensation Nuclei (CCN) activation properties of the urban aerosol in Vienna, Austria, were investigated in a long term (11 month) field study. Filter samples of the aerosol below 100 nm were taken in parallel to these measurements, and later used to generate "synthetic ambient" aerosols. Activation parameters of this "synthetic ambient" aerosol were also obtained. Hygroscopicity parameters κ [1] were calculated both for the urban and the "synthetic ambient" aerosol and also from the chemical composition. Average κ for the "synthetic ambient" aerosol ranged from 0.20 to 0.30 with an average value of 0.24, while the κ from the chemical composition of this "synthetic ambient" aerosol was significantly higher (average 0.43). The full results of the study are given elsewhere [2,3].

  15. Estuary/ocean exchange and tidal mixing in a Gulf of Maine Estuary: A Lagrangian modeling study

    Science.gov (United States)

    Bilgili, Ata; Proehl, Jeffrey A.; Lynch, Daniel R.; Smith, Keston W.; Swift, M. Robinson

    2005-12-01

    A Lagrangian particle method embedded within a 2-D finite element code, is used to study the transport and ocean-estuary exchange processes in the well-mixed Great Bay Estuarine System in New Hampshire, USA. The 2-D finite element model, driven by residual, semi-diurnal and diurnal tidal constituents, includes the effects of wetting and drying of estuarine mud flats through the use of a porous medium transport module. The particle method includes tidal advection, plus a random walk model in the horizontal that simulates sub-grid scale turbulent transport processes. Our approach involves instantaneous, massive [O(500,000)] particle releases that enable the quantification of ocean-estuary and inter-bay exchanges in a Markovian framework. The effects of the release time, spring-neap cycle, riverine discharge and diffusion strength on the intra-estuary and estuary-ocean exchange are also investigated. The results show a rather dynamic interaction between the ocean and the estuary with a fraction of the exiting particles being caught up in the Gulf of Maine Coastal Current and swept away. Three somewhat different estimates of estuarine residence time are calculated to provide complementary views of estuary flushing. Maps of residence time versus release location uncover a strong spatial dependency of residence time within the estuary that has very important ramifications for local water quality. Simulations with and without the turbulent random walk show that the combined effect of advective shear and turbulent diffusion is very effective at spreading particles throughout the estuary relatively quickly, even at low (1 m 2/s) diffusivity. The results presented here show that a first-order Markov Chain approach has applicability and a high potential for improving our understanding of the mixing processes in estuaries.

  16. Hydro-sedimentary processes of a shallow tropical estuary under Amazon influence. The Mahury Estuary, French Guiana

    Science.gov (United States)

    Orseau, Sylvain; Lesourd, Sandric; Huybrechts, Nicolas; Gardel, Antoine

    2017-04-01

    Along the Guianas coast, coastal dynamic is characterized by the migration of mud banks originating from the Amazon. This singular feature affects the dynamic and the morphology of local estuaries and can induce rapid bathymetric evolution in lower estuaries. Since 2012, the navigation channel of the Mahury Estuary (French Guiana) is enduring a severe siltation whose origin comes from a mud bank crossing the estuary mouth. This study aims to determine how the migration of a mud bank through an estuary mouth could influence the transport and fluxes in the estuary. Field measurements were performed over a year with the monitoring of the salt intrusion length, mooring surveys during spring-neap cycles and shipboard profiling surveys during semi-diurnal cycles. Salt intrusion lengths underline a significant seasonal variation characterized by the transition from a steady-state length during high river discharge and a wide range of lengths with the tidal range during low to moderate river discharge. During the rainy season, measurements indicate a fluvial-dominated condition with low suspended-sediment concentrations most of the semi-diurnal cycle. Residual sediment fluxes are usually seaward excepted when river discharge is below seasonal average. During the dry season, maximum suspended-sediment concentrations are higher in the middle part of the estuary. Residual sediment fluxes are landward along the estuary and stronger during neap tides in the estuary mouth and few kilometers upstream. In this area, a persistent density stratification traps sediments in the bottom layer and generates a gravitational circulation during neap tides, which enhances landward transports up to 2.56 t m-1 over a semi-diurnal cycle. In the middle estuary, landward fluxes are most significant during the dry season and also during the rainy season when the river discharge is below the seasonal average. Although this study includes temporal and spatial limitations, it underlines significant

  17. Foro Ambiental : CEDENMA, Asamblea Constituyente

    Directory of Open Access Journals (Sweden)

    Anne-Lise Naizot

    2013-09-01

    Full Text Available Resumen de la Mesa redonda: Orientaciones de la nueva Constitución ecuatoriana en materia ambiental: ¿avances o retrocesos en relación con el marco político y filosófico ambiental vigente en algunos países de la región?

  18. Seasonal shift in net ecosystem production in a tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Ram, A.S.P.; Nair, S.; Chandramohan, D.

    Net ecosystem production was examined in the Mandovi and Zuari estuaries (southwestern India) and the adjoining coastal waters for a period of 1 yr (January to December 1998). The study period encompassed premonsoon, monsoon, and postmonsoon seasons...

  19. Toxicity of sediments and pore water from Brunswick Estuary, GA

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — A chlor-alkali plant in Brunswick, Ga, discharged >2 kg mercury/day into a tributary of the Turtle River-Brunswick Estuary from 1966 to 1971. Mercury...

  20. Habitat Scale Mapping of Fisheries Ecosystem Service Values in Estuaries

    Directory of Open Access Journals (Sweden)

    Timothy G. O'Higgins

    2010-12-01

    Full Text Available Little is known about the variability of ecosystem service values at spatial scales most relevant to local decision makers. Competing definitions of ecosystem services, the paucity of ecological and economic information, and the lack of standardization in methodology are major obstacles to applying the ecosystem-services approach at the estuary scale. We present a standardized method that combines habitat maps and habitat-faunal associations to estimate ecosystem service values for recreational and commercial fisheries in estuaries. Three case studies in estuaries on the U.S. west coast (Yaquina Bay, Oregon, east coast (Lagoon Pond, Massachusetts, and the Gulf of Mexico (Weeks Bay, Alabama are presented to illustrate our method's rigor and limitations using available data. The resulting spatially explicit maps of fisheries ecosystem service values show within and between estuary variations in the value of estuarine habitat types that can be used to make better informed resource-management decisions.

  1. Heavy metal accumulation in a flow restricted, tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Balachandran, K.K.; Laluraj, C.M.; Nair, M.; Joseph, T.; Sheeba, P.; Venugopal, P.

    Levels of heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn), organic carbon content and textural characteristics in the surficial sediments of Cochin estuary (SW coast of India) and adjacent coast are presented. Anthropogenic inputs from...

  2. Evaluating Causes of Ecological Impairments in the Estuaries of Ukraine

    Science.gov (United States)

    Ukrainian estuaries have not undergone a systematic evaluation of the causes of ecological impairments caused by anthropogenic contamination. The objective of this evaluation is to use recently developed diagnostic tools to determine the causes of benthic ecological impairments. ...

  3. Bacterial contamination of mussels at Mahe estuary, Malabar coast

    Digital Repository Service at National Institute of Oceanography (India)

    Gore, P.S.; Raveendran, O.; Iyer, T.S.G.; Varma, P.R.G.; Sankaranarayanan, V.N.

    Mussel samples from the mussel bed and near-by market, beach sand, sediment and water from the Mahe Estuary, Kerala, India were analysed for the bacterial quality. Indicator bacteria such as Escherichia coli and faecal streptococci were isolated...

  4. Environmental forcing on jellyfish communities in a small temperate estuary.

    Science.gov (United States)

    Primo, Ana Lígia; Marques, Sónia C; Falcão, Joana; Crespo, Daniel; Pardal, Miguel A; Azeiteiro, Ulisses M

    2012-08-01

    The impact of biological, hydrodynamic and large scale climatic variables on the jellyfish community of Mondego estuary was evaluated from 2003 to 2010. Plankton samples were collected at the downstream part of the estuary. Siphonophora Muggiaea atlantica and Diphyes spp. were the main jellyfish species. Jellyfish density was generally higher in summer and since 2005 densities had increased. Summer community analysis pointed out Acartia clausi, estuarine temperature and salinity as the main driven forces for the assemblage's structure. Also, Chl a, estuarine salinity, runoff and SST were identified as the major environmental factors influencing the siphonophores summer interannual variability. Temperature influenced directly and indirectly the community and fluctuation of jellyfish blooms in the Mondego estuary. This study represents a contribution to a better knowledge of the gelatinous plankton communities in small temperate estuaries.

  5. Fish and Salinity in the San Francisco Estuary

    Science.gov (United States)

    This page provides access to a set of time-series maps for six fishes that live in the SF Estuary. Maps were produced to strengthen best available science that inform actions needed to improve protection for aquatic life.

  6. Behaviour of aluminium, silicon and iron in Tapi Estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Sharma, P.; Zingde, M.D.

    suspended particulate materials (SPM) dispersed by strong tidal currents to low dissolved Si containing coastal water and its subsequent removal in the estuary, enriching the estuarine SPM. This view was supported by markedly high Al content of estuarine SPM...

  7. The application of Yangtze Estuary Tidal Wetlands Geographic Information System

    Institute of Scientific and Technical Information of China (English)

    WANGJun; CHENZhenlou; XUShiyuan; WANGDongqi; LIUJie

    2005-01-01

    Yangtze Estuary Tidal Wetlands Geographic Information System (YETWGIS) is a comprehensive software system for environmental management and decision of Yangtze estuary tidal wetlands. Based on MapObjects components technology, Data Mining technology, mathematical modeling method and Visual Basic language, this software system has many functions such as displaying, editing, querying and searching, spatial statistics and analysis, thematic map compiling, and environmental quality evaluation. This paper firstly outlined the system structure, key techniques, and achieving methods of YETWGIS, and then, described the core modules (the thematic map compiling module and environmental quality evaluation model module) in detail. In addition, based on information entropy model, it thoroughly discussed the methods of environmental quality evaluation and indicators' weight calculation. Finally, by using YETWGIS, this paper analyzed the spatial distribution characteristics of Heavy Metal and Persistent Organic Pollutants (POPs) of the Yangtze estuary tidal wetlands in 2002, and evaluated the environmental quality of the Yangtze estuary tidal wetlands in 2003.

  8. St. Louis River Estuary 2011 - 2013 Faucet snail location data

    Data.gov (United States)

    U.S. Environmental Protection Agency — The dataset consists of GPS coordinates for benthic invertebrate collections made in the St. Louis River Estuary in 2011 through 2013, and information on whether and...

  9. Mathematical modeling of sediment transport jn estuaries and coastal regions

    Institute of Scientific and Technical Information of China (English)

    窦国仁; 董凤舞; 窦希萍; 李禔来

    1995-01-01

    Based on the suspended sediment transport equation and transport capacity formula under the action of tidal currents and wind waves, a horizontal 2-D mathematical model of suspended sediment transport for estuaries and coastal regions is established. The verification of calculations shows that the sediment concentration distribution and sea bed deformation in the estuaries and coastal regions can be successfully simulated. Therefore, a new method for studying and solving the sediment problems in the estuarine and coastal engineering is presented.

  10. Contamination and restoration of an estuary affected by phosphogypsum releases

    Energy Technology Data Exchange (ETDEWEB)

    Villa, M., E-mail: mvilla@us.es [Centro de Investigacion, Tecnologia e Innovacion, Universidad de Sevilla CITIUS, Av. Reina Mercedes 4B, E41012-Sevilla (Spain); Mosqueda, F. [Dpto. de Fisica Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus de El Carmen, 21007-Huelva (Spain); Hurtado, S. [Centro de Investigacion, Tecnologia e Innovacion, Universidad de Sevilla CITIUS, Av. Reina Mercedes 4B, E41012-Sevilla (Spain); Mantero, J.; Manjon, G. [E. T. S. Arquitectura, Universidad de Sevilla, Departamento de Fisica Aplicada II, Av. Reina Mercedes, 2. 41012-Sevilla (Spain); Perianez, R. [E.U.I.T.A., Universidad de Sevilla, Departamento de Fisica Aplicada III, Carretera de Utrera, Km. 1, 41013 Sevilla (Spain); Vaca, F. [Dpto. de Fisica Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus de El Carmen, 21007-Huelva (Spain); Garcia-Tenorio, R. [E. T. S. Arquitectura, Universidad de Sevilla, Departamento de Fisica Aplicada II, Av. Reina Mercedes, 2. 41012-Sevilla (Spain)

    2009-12-15

    The Huelva Estuary in Huelva, Spain, has been one of the most studied environmental compartments in the past years from the point of view of naturally occurring radioactive material (NORM) releases. It has been historically affected by waste releases, enriched in radionuclides from the U-decay series, from factories located in the area devoted to the production of phosphoric acid and phosphate fertilizers. Nevertheless, changes in national regulations forced a new waste management practice in 1998, prohibiting releases of phosphogypsum into the rivers. The input of natural radionuclides from phosphate factories to rivers was drastically reduced. Because of this there was a unique opportunity for the study of the response of a contaminated environmental compartment, specifically an estuary affected by tidal influences, after the cessation of the contaminant releases to, in this case, the Huelva Estuary (henceforth referred to as the Estuary). To investigate the environmental response to this new discharge regime, the specific activities of radionuclides {sup 226}Ra and {sup 210}Pb in water and sediment samples collected in four campaigns (from 1999 to 2005) were determined and compared with pre-1998 values. From this study it is possible to infer the most effective mechanisms of decontamination for the Estuary. Decontamination rates of {sup 210}Pb and {sup 226}Ra in the sediments and water have been calculated using exponential fittings and corresponding half-lives have been deduced from them. The cleaning half-life in the whole area of the Estuary is about 6 and 3.5 years for {sup 226}Ra and {sup 210}Pb respectively. The observed trend clearly shows that contamination of the Estuary by natural radionuclides is now decreasing and radioactive levels in waters and sediments are approaching the natural background references. This work attempts to evaluate whether it can be expected that the decontamination of the enhanced levels of natural radioactivity in the Estuary

  11. Contamination and restoration of an estuary affected by phosphogypsum releases.

    Science.gov (United States)

    Villa, M; Mosqueda, F; Hurtado, S; Mantero, J; Manjón, G; Periañez, R; Vaca, F; García-Tenorio, R

    2009-12-15

    The Huelva Estuary in Huelva, Spain, has been one of the most studied environmental compartments in the past years from the point of view of naturally occurring radioactive material (NORM) releases. It has been historically affected by waste releases, enriched in radionuclides from the U-decay series, from factories located in the area devoted to the production of phosphoric acid and phosphate fertilizers. Nevertheless, changes in national regulations forced a new waste management practice in 1998, prohibiting releases of phosphogypsum into the rivers. The input of natural radionuclides from phosphate factories to rivers was drastically reduced. Because of this there was a unique opportunity for the study of the response of a contaminated environmental compartment, specifically an estuary affected by tidal influences, after the cessation of the contaminant releases to, in this case, the Huelva Estuary (henceforth referred to as the Estuary). To investigate the environmental response to this new discharge regime, the specific activities of radionuclides 226Ra and 210Pb in water and sediment samples collected in four campaigns (from 1999 to 2005) were determined and compared with pre-1998 values. From this study it is possible to infer the most effective mechanisms of decontamination for the Estuary. Decontamination rates of 210Pb and 226Ra in the sediments and water have been calculated using exponential fittings and corresponding half-lives have been deduced from them. The cleaning half-life in the whole area of the Estuary is about 6 and 3.5 years for 226Ra and 210Pb respectively. The observed trend clearly shows that contamination of the Estuary by natural radionuclides is now decreasing and radioactive levels in waters and sediments are approaching the natural background references. This work attempts to evaluate whether it can be expected that the decontamination of the enhanced levels of natural radioactivity in the Estuary can be performed via natural

  12. Juvenile salmon usage of the Skeena River estuary.

    Science.gov (United States)

    Carr-Harris, Charmaine; Gottesfeld, Allen S; Moore, Jonathan W

    2015-01-01

    Migratory salmon transit estuary habitats on their way out to the ocean but this phase of their life cycle is more poorly understood than other phases. The estuaries of large river systems in particular may support many populations and several species of salmon that originate from throughout the upstream river. The Skeena River of British Columbia, Canada, is a large river system with high salmon population- and species-level diversity. The estuary of the Skeena River is under pressure from industrial development, with two gas liquefaction terminals and a potash loading facility in various stages of environmental review processes, providing motivation for understanding the usage of the estuary by juvenile salmon. We conducted a juvenile salmonid sampling program throughout the Skeena River estuary in 2007 and 2013 to investigate the spatial and temporal distribution of different species and populations of salmon. We captured six species of juvenile anadromous salmonids throughout the estuary in both years, and found that areas proposed for development support some of the highest abundances of some species of salmon. Specifically, the highest abundances of sockeye (both years), Chinook in 2007, and coho salmon in 2013 were captured in areas proposed for development. For example, juvenile sockeye salmon were 2-8 times more abundant in the proposed development areas. Genetic stock assignment demonstrated that the Chinook salmon and most of the sockeye salmon that were captured originated from throughout the Skeena watershed, while some sockeye salmon came from the Nass, Stikine, Southeast Alaska, and coastal systems on the northern and central coasts of British Columbia. These fish support extensive commercial, recreational, and First Nations fisheries throughout the Skeena River and beyond. Our results demonstrate that estuary habitats integrate species and population diversity of salmon, and that if proposed development negatively affects the salmon populations that

  13. Spatial variation of the longitudinal dispersion coefficient in an estuary

    OpenAIRE

    D. C. Shaha; Y.-K. Cho; M.-T. Kwak; S. R. Kundu; K. T. Jung

    2011-01-01

    The effective longitudinal dispersion is a primary tool for determining property distributions in estuaries. Most previous studies have examined the longitudinal dispersion coefficient for the average tidal condition. However, information on spatial and temporal variations of this coefficient at low and high tide is scarce. Three years of hydrographic data taken at low and high tide along the main axis of the Sumjin River Estuary (SRE), Korea are used to estimate the spatial and temporal vari...

  14. Wind Wave Behavior in Fetch and Depth Limited Estuaries

    Science.gov (United States)

    Karimpour, Arash; Chen, Qin; Twilley, Robert R.

    2017-01-01

    Wetland dominated estuaries serve as one of the most productive natural ecosystems through their ecological, economic and cultural services, such as nursery grounds for fisheries, nutrient sequestration, and ecotourism. The ongoing deterioration of wetland ecosystems in many shallow estuaries raises concerns about the contributing erosive processes and their roles in restraining coastal restoration efforts. Given the combination of wetlands and shallow bays as landscape components that determine the function of estuaries, successful restoration strategies require knowledge of wind wave behavior in fetch and depth limited water as a critical design feature. We experimentally evaluate physics of wind wave growth in fetch and depth limited estuaries. We demonstrate that wave growth rate in shallow estuaries is a function of wind fetch to water depth ratio, which helps to develop a new set of parametric wave growth equations. We find that the final stage of wave growth in shallow estuaries can be presented by a product of water depth and wave number, whereby their product approaches 1.363 as either depth or wave energy increases. Suggested wave growth equations and their asymptotic constraints establish the magnitude of wave forces acting on wetland erosion that must be included in ecosystem restoration design.

  15. Wind Wave Behavior in Fetch and Depth Limited Estuaries.

    Science.gov (United States)

    Karimpour, Arash; Chen, Qin; Twilley, Robert R

    2017-01-18

    Wetland dominated estuaries serve as one of the most productive natural ecosystems through their ecological, economic and cultural services, such as nursery grounds for fisheries, nutrient sequestration, and ecotourism. The ongoing deterioration of wetland ecosystems in many shallow estuaries raises concerns about the contributing erosive processes and their roles in restraining coastal restoration efforts. Given the combination of wetlands and shallow bays as landscape components that determine the function of estuaries, successful restoration strategies require knowledge of wind wave behavior in fetch and depth limited water as a critical design feature. We experimentally evaluate physics of wind wave growth in fetch and depth limited estuaries. We demonstrate that wave growth rate in shallow estuaries is a function of wind fetch to water depth ratio, which helps to develop a new set of parametric wave growth equations. We find that the final stage of wave growth in shallow estuaries can be presented by a product of water depth and wave number, whereby their product approaches 1.363 as either depth or wave energy increases. Suggested wave growth equations and their asymptotic constraints establish the magnitude of wave forces acting on wetland erosion that must be included in ecosystem restoration design.

  16. PCBs in the fish assemblage of a southern European estuary

    Science.gov (United States)

    Baptista, Joana; Pato, Pedro; Pereira, Eduarda; Duarte, Armando C.; Pardal, Miguel A.

    2013-02-01

    The Mondego estuary fish assemblage was studied for the accumulation of PCBs. Three sampling stations were visited along an estuarine salinity gradient, and, in total, 15 species were collected. Analysis of PCBs revealed no significant differences among the sampling stations, although differences were observed among the fish assemblages. Fish assemblages could be divided into three groups. The first group comprised those with higher concentration (more than 10 ng g- 1, dw), included the species Gobius niger, Sardina pilchardus, Anguilla anguilla, Pomatoschistus microps, Chelidonichthys lucerna and Liza ramada; the second group with medium concentration (5-10 ng g- 1, dw), included the species Pomatoschistus minutus, Dicentrarchus labrax, Atherina presbyter, Chelon labrosus, Diplodus vulgaris, Platichthys flesus and Cilata mustela; and a third group with low concentration (less than 5 ng g- 1, dw), included the species Solea solea and Callionymus lyra. A positive correlation was found between lipid content and PCB concentrations. To evaluate the influence of the residence time of species on the accumulation of PCBs, species were divided into two groups: species that spend more than 3 years in the estuary, and species that spend less than 3 years in the estuary. Species that spend more than 3 years in the estuary presented higher concentrations than species that spend less than 3 years in the estuary. CBs 138 and 153 had higher concentration, and tended to increase with time spent in the estuary.

  17. [The benthic fauna of Sabancuy Estuary, Campeche, Mexico].

    Science.gov (United States)

    González Solís, A; Torruco Gómez, D

    2001-03-01

    The fish and invertebrates community structure in the Sabancuy estuary was analyzed in two seasons and 14 sampling stations (13 along the estuary and one in the marine adjacent coast). No significant differences were found between seasons. The environmental frame defines two zones within the estuary, the first extends from the access highway to Sabancuy town until the Pujo mouth in the west; the second from the bridge to the estuary head in the east. The most abundant invertebrates were mollusks (51.8% of the total), in biomass the crustaceans dominated. The fish included 21 families and 33 species; the most abundant were Gerridae, Scianidae, Sparidae, Lutjanidae and Ciprinodontidae. The highest diversities of both communities correspond to the central part of the estuary. These communities include three sections with notable differences in faunal distribution: one is influenced by the exit to Terminos lagoon, the secondary in the estuary head and a third is in a transition zone defined by the proximity of the town access bridge. The ecological organization suggests a strong division caused by the bridge, both sides are scarce in habitats and nutrient resources and this is reflected in the low species counts.

  18. Rasgos morfológicos de semillas y su implicación en la conservación ex situ de especies leñosas en los bosques secos Tumbesinos

    Directory of Open Access Journals (Sweden)

    J. M. Romero-Saritama

    2016-01-01

    Full Text Available Actualmente existe un gran interés por describir y estudiar rasgos funcionales en las plantas, estos nos ayudan a predecir ciertos comportamientos e interacciones ecológicas de las especies ante cambios ambientales o antropológicos en los ecosistemas. Los rasgos morfológicos de las semillas están involucrados en procesos durante el ciclo de vida de las plantas. Sin embargo, dichos rasgos no han sido bien estudiados desde el punto de vista funcional en diferentes hábitats, especialmente en zonas secas tropicales, donde existe gran diversidad de especies con alto riesgo de amenaza. Los bosques secos Tumbesinos compartidos entre el suroccidente del Ecuador y noroccidente del Perú, son considerados un hotspot por su alta diversidad y endemismo. No obstante están muy amenazados y algunas especies forestales han sido ya incluidas en listas rojas con algún grado de amenaza. Por ello, es urgente generar investigación e información que permita la conservación de los recursos genéticos forestales de las es- pecies de los bosques secos. Una de las alternativas más práctica e inmediata es la colección y almacenamiento ex situ de semillas. Sin embargo, en hábitats secos tropicales hay un gran desconocimiento de la ecología, fisiología y morfología de semillas lo que dificulta llevar a cabo esta estra- tegia de conservación. Conocer los rasgos morfológicos de las semillas nos podrían ayudar a establecer la mejor manera de colectar y conservar las especies forestales. El presente artículo analiza e incorpora información sobre rasgos morfológicos de semillas de especies leñosas que han sido poco o nada estudiados desde el punto de vista funcional en los bosques secosTumbesinos, y analiza cómo la información de los rasgos mor- fológicos de semillas podrían servir como una herramienta para optimizar el proceso de conservación ex situ de estas especies.

  19. Urea degradation rates by size-fractionated plankton populations in a temperate estuary

    Science.gov (United States)

    Savidge, G.; Johnston, J. P.

    1987-04-01

    The distribution of the rates of remineralisation and assimilation of labelled urea by bacteria was determined in a temperate estuary in winter and related to the activities of planktonic populations separated by filtration into a large fraction (LF > 3 μm) and small fractions (SF urea concentrations, whereas corresponding relationships between the LF in situ and urea concentrations were inconsistent. A series of comparable artificial dilution experiments demonstrated consistent effects of salinity on rates of urea remineralisation with opposing relationships observed for the LF and SF. However interpretation of the data obtained from the in situ samples in relation to those obtained experimentally indicated only minimal control of the in situ rates of urea remineralisation by salinity, thus confirming the greater influence on these rates of the ambient urea concentrations. Remineralisation activity was approximately an order of magnitude greater than the assimilation activity with no clear trends being shown between assimilation rates and environmental variables. Highest ambient concentrations of urea were consistently recorded adjacent to the freshwater inflow.

  20. Rasgos estructurales en la Sierra Pampeana de Velasco y alrededores a partir de los campos gravimétricos y magnetrométricos

    Directory of Open Access Journals (Sweden)

    Marcos A Sánchez

    2013-06-01

    Full Text Available La región que comprende la sierra de Velasco y el Sistema de Famatina, en el centro-oeste de la Provincia de La Rioja - Argentina, es un área clave para el estudio de la amalgamación de terrenos y tectónica vinculada con el levantamiento andino. En éste trabajo, se definen algunos rasgos de la estructura cortical de ésta región. Para ello, mediante la aplicación de métodos potenciales (gravedad y magnetismo, adecuadamente procesados e interpretados a través de técnicas semiautomáticas y de resalto de anomalías, se logró determinar: a una región que respondería a la zona de sutura entre los terrenos Famatina y Pampia y b fallas relacionadas al levantamiento de las sierras de Famatina y de Velasco. Los resultados anteriores se representan en una sección este - oeste en un modelo estructural de bloques de basamento entre Famatina y Velasco, hasta 12 km de profundidad. En él señalamos además la distribución de las fallas y sus buzamientos.

  1. Propiedades Psicométricas del Inventario de Depresión Estado Rasgo (IDER con una muestra de población general colombiana

    Directory of Open Access Journals (Sweden)

    Diana María Agudelo Vélez

    2014-01-01

    Full Text Available This study provides information regarding the psychometric properties of the IDER (Inventario de Depresión Estado/Rasgo with a non-clinical Colombian sample (N= 1043. Data for validity and reliability are reported. The findings are similar to data obtained with Spanish, American, and Chilean samples. Data from exploratory and confirmatory factorial analyses confirm the bifactorial structure (dysthymia and euthymia of the instrument. Reliability levels range from .71 to .86. The convergent validity indexes in relation to the CBD are moderate and significant (.59. On the other hand, correlations with the STAI and STAXI-2, as measures of discriminant validity, were lower, although still significant (between .25 and .38 for anxiety and between .25 and .43 for anger. Women obtained higher scores than men, similar to previous studies. The findings from this new sample confirm the adequate psychometric properties of the instrument. Nevertheless, it is important to note that the IDER is valuable as a measure of negative negativity but not as a diagnostic instrument for depression.

  2. Relación entre variabilidad biogeoquímica y rasgos estructurales de la comunidad microbiana en suelos forestales: Bosques de Abies pinsapo como caso de estudio

    Directory of Open Access Journals (Sweden)

    P. Torres-Cañabate

    2009-01-01

    Full Text Available Relación entre variabilidad biogeoquímica y rasgos estructurales de la comunidad microbiana en suelos forestales: Bosques de Abies pinsapo como caso de estudio. Tradicionalmente, los estudios biogeoquímicos consideraban el suelo como una "caja negra", conectada con el resto del ecosistema mediante flujos de entrada y de salida de nutrientes, en la que éstos experimentan transformaciones mediadas engran parte por microorganismos desconocidos. El desarrollo de nuevas técnicas moleculares ha incrementado el conocimiento sobre lascomunidades microbianas del suelo. Estudios recientes han puesto de manifiesto correspondencias entre la variabilidad de la disponibilidad de nutrientes y la estructura de la comunidad microbiana en suelos forestales. A este respecto, hemos empleado bosques de Abies pinsapo como modelo ya que muestran una gran variabilidad biogeoquímica asociada a diferencias litológicas y sucesionales, mientras que la estacionalidad mediterránea provoca una alta variabilidad intra-anual en la disponibilidad de nutrientes. Además, existen pinsapares sujetos alimitación o a saturación de nitrógeno. Mediante análisis del polimorfismo de longitud de fragmentos de restricción terminal (T-RFLP, hemos puesto de manifiesto que los patrones de variabilidad biogeoquímica descritos en los pinsapares se corresponden con cambios en la composición y estructura de sus comunidades bacterianas.

  3. HERRAMIENTA DE LÓGICA DIFUSA PARA DEFINIR RASGOS DE LA PERSONALIDAD DE UN INDIVIDUO Fuzzy Logic Tool for Defining an Individual's Personality Traits

    Directory of Open Access Journals (Sweden)

    Liliana González Palacio

    2011-12-01

    Full Text Available Los métodos usados actualmente para definir la personalidad de un individuo están compuestos por un conjunto de preguntas que son analizadas por un especialista, y de acuerdo con unos parámetros establecidos se genera el diagnóstico. Este procedimiento incorpora subjetividad, y potencia la aparición de errores. Buscando evitar el sesgo en los resultados que aparece por el criterio del especialista y automatizar tareas de procesamiento de información disminuyendo tiempos y cantidad de errores, en este artículo se propone un mecanismo para definir rasgos de la personalidad de un individuo usando lógica difusa.Methods used currently to define an individual's personality consist of a set of questions which are analyzed by a specialist and, according to several parameters, a diagnosis is made. This procedure incorporates subjectivity and error emergence possibility. In the search for avoiding biased results caused by the specialist's criterion and automating information processing tasks to reduce times and amount of errors, a mechanism for defining an individual's personality traits using fuzzy logic is proposed in this article.

  4. Sociología ambiental

    OpenAIRE

    Domínguez Gómez, José Andrés; Aledo Tur, Antonio

    2001-01-01

    Este libro pretende ser un manual para los alumnos de las licenciaturas de sociología, ecología, ciencias ambientales o economía y profesionales de esas ramas que estén interesados en el estudio de las relaciones entre medio ambiente y sociedad desde una aproximación sociológica. El manual está divido en dos partes. La primera desarrolla las principales teorías sociológicas sobre el medio ambiente, así como el heterogéneo pensamiento ambiental. La segunda parte, ofrece capítulos diversos en l...

  5. Ciencia, cultura y medio ambiente

    OpenAIRE

    Ángel Maya, Augusto

    1991-01-01

    La crisis ambiental no es un fenómeno exclusivamente de orden tecnológico. Interroga por igual las organizaciones socio-políticas y los instrumentos científicos para el estudio de la realidad: posiblemente uno de los obstáculos mayores para el encuentro de soluciones adecuadas a la crisis ambiental, radica no en deficiencias de orden técnico, sino en la incapacidad de los instrumentos teóricos para entenderla. La crisis del medio ambiente ha puesto en claro la ambivalencia no sólo de la organ...

  6. La crisis del medio ambiente

    OpenAIRE

    Juan Carlos Quintero Vélez; Clemencia Camacho Delgado

    2013-01-01

    Este artículo, introducción al tema del medio ambiente, pretende proporcionar conceptos básicos para analizar y dimensionar el impacto que genera el hombre sobre los sistemas que soportan la vida. Para entender estos problemas, es indispensable partir de un análisis básico de la relación entre el hombre actual, su medio ambiente, sus necesidades y sus actividades. El autor revisa los antecedentes, las causas y las consecuencias de la crisis ambiental internacional, e intenta dar explicación a...

  7. NEW DATA ABOUT MACROZOOBENTHOS OF BEYSUGSKY ESTUARY (SEA OF AZOV

    Directory of Open Access Journals (Sweden)

    N. I. Bulysheva

    2013-01-01

    Full Text Available Abstract. Aim. Beysugsky Estuary is one of the biggest estuaries of the Azov-Kuban’ lowland. Like the other water bodies in the South of Russia, this one is subject to strong anthropogenic load: detachment of the freshwater part for establishing the Beysug spawning area; regulation of the flow of the rivers feeding the estuary; destruction of the Yasenskaya spit and narrowing of the Bugaz mouth; disorganized tourism. The ongoing reformation of the ecosystem makes it necessary to carry out the analyses of the modern state of the biota of this water body and uncover reasons and regularities of its change.Location. Beysug Estuary of the Sea of Azov.Methods. Quantitative zoobenthos samples were taken with the Petersen dredger (sampling area 0,034 m2 from board of the inflatable “Zodiac” boat. Qualitative samples were taken in the coastal zone by hand and with the dredge. All the samples taken were washed through the bag made of mill sieve with mesh size 0,5 mm, and then were fixed in a plastic bucket by 4 % formaldehyde (quantitative samples or 70 % ethyl alcohol (qualitative samples. Taking and processing of samples were carried out in field and laboratory environment using common methods. 22 samples at 7 stations were taken in total.Results. Macrozoobenthos was presented by 14 invertebrate species. Estuarine fauna is the depleted version of the euryhaline one of the Sea of Azov with Holocene relic macrophyte-dwelling elements. Biodiversity and quantitative characters of the estuarine communities decrease from west to east. Pelophylic detritophages predominated in the benthic communities of the estuary. The results of this research are meant to be used for uncovering historical ways of forming of benthic fauna and clearing up the dependence of community structure on the seawater influence, freshwater flow, regulation of freshwater and seawater sources, nature of changing of faunas at salinization of estuaries connected with the sea and the

  8. Discriminación experimental de los rasgos técnicos en la talla bipolar y a mano alzada en lascas a través los cuarzos de Naibor Soit (Garganta de Olduvai, Tanzania

    Directory of Open Access Journals (Sweden)

    Domínguez Rodrigo, M.

    2012-01-01

    Full Text Available La identificación de la talla bipolar puede ser controvertida debido fundamentalmente a la naturaleza petrográfica del cuarzo y a su fracturación heterogénea. Este trabajo pretende superar este problema mediante el desarrollo de un marco explicativo experimental destinado al reconocimiento de los rasgos diagnósticos en las lascas producidas por ambos métodos de talla en la reducción del cuarzo de Naibor Soit (Garganta de Olduvai, Tanzania. El objetivo final de este trabajo es el de utilizar un conjunto de variables relacionadas con la respuesta de esta materia prima a la fractura a mano alzada y bipolar en dos experimentos destinados a individualizar estadísticamente los rasgos técnicos diagnósticos que mejor identifican a la talla bipolar en este tipo de materia prima.

  9. Hydrodynamic controls on oxygen dynamics in a riverine salt wedge estuary, the Yarra River estuary, Australia

    Science.gov (United States)

    Bruce, L. C.; Cook, P. L. M.; Teakle, I.; Hipsey, M. R.

    2014-04-01

    Oxygen depletion in coastal and estuarine waters has been increasing rapidly around the globe over the past several decades, leading to decline in water quality and ecological health. In this study we apply a numerical model to understand how salt wedge dynamics, changes in river flow and temperature together control oxygen depletion in a micro-tidal riverine estuary, the Yarra River estuary, Australia. Coupled physical-biogeochemical models have been previously applied to study how hydrodynamics impact upon seasonal hypoxia; however, their application to relatively shallow, narrow riverine estuaries with highly transient patterns of river inputs and sporadic periods of oxygen depletion has remained challenging, largely due to difficulty in accurately simulating salt wedge dynamics in morphologically complex areas. In this study we overcome this issue through application of a flexible mesh 3-D hydrodynamic-biogeochemical model in order to predict the extent of salt wedge intrusion and consequent patterns of oxygen depletion. The extent of the salt wedge responded quickly to the sporadic riverine flows, with the strength of stratification and vertical density gradients heavily influenced by morphological features corresponding to shallow points in regions of tight curvature ("horseshoe" bends). The spatiotemporal patterns of stratification led to the emergence of two "hot spots" of anoxia, the first downstream of a shallow region of tight curvature and the second downstream of a sill. Whilst these areas corresponded to regions of intense stratification, it was found that antecedent conditions related to the placement of the salt wedge played a major role in the recovery of anoxic regions following episodic high flow events. Furthermore, whilst a threshold salt wedge intrusion was a requirement for oxygen depletion, analysis of the results allowed us to quantify the effect of temperature in determining the overall severity and extent of hypoxia and anoxia. Climate

  10. Urban microbial ecology of a freshwater estuary of Lake Michigan.

    Science.gov (United States)

    Fisher, Jenny C; Newton, Ryan J; Dila, Deborah K; McLellan, Sandra L

    Freshwater estuaries throughout the Great Lakes region receive stormwater runoff and riverine inputs from heavily urbanized population centers. While human and animal feces contained in this runoff are often the focus of source tracking investigations, non-fecal bacterial loads from soil, aerosols, urban infrastructure, and other sources are also transported to estuaries and lakes. We quantified and characterized this non-fecal urban microbial component using bacterial 16S rRNA gene sequences from sewage, stormwater, rivers, harbor/estuary, and the lake surrounding Milwaukee, WI, USA. Bacterial communities from each of these environments had a distinctive composition, but some community members were shared among environments. We used a statistical biomarker discovery tool to identify the components of the microbial community that were most strongly associated with stormwater and sewage to describe an "urban microbial signature," and measured the presence and relative abundance of these organisms in the rivers, estuary, and lake. This urban signature increased in magnitude in the estuary and harbor with increasing rainfall levels, and was more apparent in lake samples with closest proximity to the Milwaukee estuary. The dominant bacterial taxa in the urban signature were Acinetobacter, Aeromonas, and Pseudomonas, which are organisms associated with pipe infrastructure and soil and not typically found in pelagic freshwater environments. These taxa were highly abundant in stormwater and sewage, but sewage also contained a high abundance of Arcobacter and Trichococcus that appeared in lower abundance in stormwater outfalls and in trace amounts in aquatic environments. Urban signature organisms comprised 1.7% of estuary and harbor communities under baseflow conditions, 3.5% after rain, and >10% after a combined sewer overflow. With predicted increases in urbanization across the Great Lakes, further alteration of freshwater communities is likely to occur with potential

  11. THE CHARACTERISTIC OF MARINE ENVIRONMENT IN LINGDINGYANG ESTUARY

    Institute of Scientific and Technical Information of China (English)

    CHEN; Bing-lu

    2001-01-01

    [1]LIN Zhi-qing, 1985. The Nutrient salts in the water between Guangzhou and Humen [J] . Tropical Oceanography, 4(2):52-59. (in Chinese)[2]LUO Zhang-ren, YING Zhi-pu et al., 1992. The Harbours in South China[M]. Guangzhou: Zhongshan University Press,101-126. (in Chinese)[3]PENG Yun-hui et al., 1991. The relationship of phosphate and dissolved oxygen in Pearl River Estuary [J]. Marine Report,10(6): 25-29. (in Chinese)[4]PENG Yun-hui et al., 1994. The relationship of dissolved oxygen and nutrient salts in Pearl River Estuary[J]. Tropical Oceanography, 13(1): 96-100. (in Chinese)[5]TAN Wei-guang et al., 1993. Assessment of eutrophication of Pearl River Estuary [J] . Research & Exploration of Nanhai, (2): 17-21. (in Chinese)[6]TANG Yong-Luan, 1984. The Characteristic of the dispersion model of the substances of Pearl River Estuary and Lingding Estuary [J] . Marine Environmental Science, 3(3): 1-11.(in Chinese)[7]ZHOU Yan-xia, 1994. Analysis of the water quality of Pearl River Estuary and neighboring sea area [J]. Marine Report, 13(3):24-30. (in Chinese)[8]ZHAO Huan-ting, 1981. The topograghy of Lingding Estuary [J]. Journal of Oceanography, 3(2): 20-27. (in Chinese)

  12. Urban microbial ecology of a freshwater estuary of Lake Michigan

    Directory of Open Access Journals (Sweden)

    Jenny C. Fisher

    2015-07-01

    Full Text Available Abstract Freshwater estuaries throughout the Great Lakes region receive stormwater runoff and riverine inputs from heavily urbanized population centers. While human and animal feces contained in this runoff are often the focus of source tracking investigations, non-fecal bacterial loads from soil, aerosols, urban infrastructure, and other sources are also transported to estuaries and lakes. We quantified and characterized this non-fecal urban microbial component using bacterial 16S rRNA gene sequences from sewage, stormwater, rivers, harbor/estuary, and the lake surrounding Milwaukee, WI, USA. Bacterial communities from each of these environments had a distinctive composition, but some community members were shared among environments. We used a statistical biomarker discovery tool to identify the components of the microbial community that were most strongly associated with stormwater and sewage to describe an “urban microbial signature,” and measured the presence and relative abundance of these organisms in the rivers, estuary, and lake. This urban signature increased in magnitude in the estuary and harbor with increasing rainfall levels, and was more apparent in lake samples with closest proximity to the Milwaukee estuary. The dominant bacterial taxa in the urban signature were Acinetobacter, Aeromonas, and Pseudomonas, which are organisms associated with pipe infrastructure and soil and not typically found in pelagic freshwater environments. These taxa were highly abundant in stormwater and sewage, but sewage also contained a high abundance of Arcobacter and Trichococcus that appeared in lower abundance in stormwater outfalls and in trace amounts in aquatic environments. Urban signature organisms comprised 1.7% of estuary and harbor communities under baseflow conditions, 3.5% after rain, and >10% after a combined sewer overflow. With predicted increases in urbanization across the Great Lakes, further alteration of freshwater communities is

  13. Biogeography of dinoflagellate cysts in northwest Atlantic estuaries.

    Science.gov (United States)

    Price, Andrea M; Pospelova, Vera; Coffin, Michael R S; Latimer, James S; Chmura, Gail L

    2016-08-01

    Few biogeographic studies of dinoflagellate cysts include the near-shore estuarine environment. We determine the effect of estuary type, biogeography, and water quality on the spatial distribution of organic-walled dinoflagellate cysts from the Northeast USA (Maine to Delaware) and Canada (Prince Edward Island). A total of 69 surface sediment samples were collected from 27 estuaries, from sites with surface salinities >20. Dinoflagellate cysts were examined microscopically and compared to environmental parameters using multivariate ordination techniques. The spatial distribution of cyst taxa reflects biogeographic provinces established by other marine organisms, with Cape Cod separating the northern Acadian Province from the southern Virginian Province. Species such as Lingulodinium machaerophorum and Polysphaeridinium zoharyi were found almost exclusively in the Virginian Province, while others such as Dubridinium spp. and Islandinium? cezare were more abundant in the Acadian Province. Tidal range, sea surface temperature (SST), and sea surface salinity (SSS) are statistically significant parameters influencing cyst assemblages. Samples from the same type of estuary cluster together in canonical correspondence analysis when the estuaries are within the same biogeographic province. The large geographic extent of this study, encompassing four main estuary types (riverine, lagoon, coastal embayment, and fjord), allowed us to determine that the type of estuary has an important influence on cyst assemblages. Due to greater seasonal variations in SSTs and SSSs in estuaries compared to the open ocean, cyst assemblages show distinct latitudinal trends. The estuarine context is important for understanding present-day species distribution, the factors controlling them, and to better predict how they may change in the future.

  14. Circulation and mixing process in Vasishta-Godavari estuary, east coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Kumar, A.R.S.; Murty, T.V.R.; Rao, M.M.M.; Rao, V.R.; Reddy, B.S.R.

    Circulation and Mixing Process in Vasishta-Godavari Estuary, have been studied by using estuarine classification model. Analysis of salinity, salt budget, diffusion coefficients and flushing times based on salinity data of Vasishta-Godavari estuary...

  15. Influence of Saltwater Barrage on Tides, Salinity, and Chlorophyll a in Cochin Estuary, India

    Digital Repository Service at National Institute of Oceanography (India)

    Shivaprasad, A.; Vinita, J.; Revichandran, C.; Manoj, N.T.; Srinivas, K.; Reny, P.D.; Ashwini, R.; Muraleedharan, K.R.

    Thanneermukkam Barrage (TB) is constructed in the southern arm of Cochin estuary. It prevents salt intrusion upstream and regulates river discharge downstream. Characteristics of the estuary when the barrage is opened and closed are discussed...

  16. Bacterial domination over Archaea in ammonia oxidation in a monsoon-driven tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Vipindas, P.V.; Anas, A.; Jasmin, C.; Lallu, K.R.; Fausia, K.H.; Balachandran, K.K.; Muraleedharan, K.R.; Nair, S.

    Autotrophic ammonia oxidizing microorganisms,which are responsible for the rate-limiting step of nitrification in most aquatic systems, have not been studied in tropical estuaries. Cochin estuary (CE) is one of the largest, productive, and monsoon...

  17. Seasonal variations in abundance, biomass and grazing rates of microzooplankton in a tropical monsoonal estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Gauns, M.; Mochemadkar, S.; Patil, S.; Pratihary, A.K.; Naqvi, S.W.A.; Madhupratap, M.

    Seasonal abundance, composition and grazing rates of microzooplankton (20–200 µm) in the Zuari estuary were investigated to evaluate their importance in food web dynamics of a tropical monsoonal estuary. Average abundances of microzooplankton...

  18. Suspended sediment fluxes in a tropical estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    AnilKumar, N.; DineshKumar, P.K.; Srinivas, K.

    Annual transport processes of suspended sediments in Beypore estuary - a tropical estuary along the south west coast of India - were investigated based on time series measurements within the system. It's observed that the sediment transport...

  19. Ambiguities in the classification of cochin estuary, West coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Shivaprasad, A.; Vinita, J.; Revichandran, C.; Manoj, N.T.; Jayalakshmy, K.V.; Muraleedharan, K.R.

    , an attempt is made to evaluate several classification schemes for the estuary. The existing methods proved to be insufficient to represent the real salient features of this typical estuary. Arguments are also presented to illustrate the confusion in the names...

  20. Maturation of the penaeid prawn Metapenaeus moyebi in Mandovi Estuary, Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Nair, S.R.S.; Achuthankutty, C.T.; Parulekar, A.H.

    Metapenaeus moyebi contributed a good share of penaeid prawn population in the Mandovi Estuary of Goa, India throughout the year. Both males and females of this species with fully mature gonads were observed in the estuary, suggesting further...

  1. Temporal variation of diatom benthic propagules in a monsoon-influenced tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Patil, J.S.; Anil, A

    Temporal variations in the diatom benthic propagule (DBP) community and their role in the phytoplankton community in a monsoon-affected tropical estuary, Zuari estuary, Goa (India) are presented. The DBP from the sediments was enumerated using...

  2. West Coast Estuaries for Groundfish Essential Fish Habitat (EFH) Environmental Impact Statement

    Data.gov (United States)

    Pacific States Marine Fisheries Commission — These data depict the boundaries of estuaries along the West Coast of the United States. The estuary boundaries are delineated according to the U.S. Fish and...

  3. Life in an extreme environment: phytoplankton blooms in the upper Scheldt estuary

    OpenAIRE

    Muylaert, K.; Kromkamp, J.

    2002-01-01

    Being extremely turbid environments characterised by short residence times and rapid changes in salinity, the upper reaches of estuaries comprise an extreme environment for phytoplankton to live and grow in. Nevertheless, in many estuaries including the Schelde estuary, these reaches often support dense phytoplankton populations. In the past, these phytoplankton blooms in the upper reaches of estuaries have often been found difficult to explain. In this presentation, we will describe the exte...

  4. Horizontal distribution and population dynamics of the dominant mysid Hyperacanthomysis longirostris along a temperate macrotidal estuary (Chikugo River estuary, Japan)

    Science.gov (United States)

    Suzuki, Keita W.; Nakayama, Kouji; Tanaka, Masaru

    2009-08-01

    The estuarine turbidity maximum (ETM) that develops in the lower salinity areas of macrotidal estuaries has been considered as an important nursery for many fish species. Mysids are one of the dominant organisms in the ETM, serving as a key food source for juvenile fish. To investigate the horizontal distribution and population dynamics of dominant mysids in relation to the fluctuation of physical conditions (temperature, salinity, turbidity, and freshwater discharge), we conducted monthly sampling (hauls of a ring net in the surface water) along the macrotidal Chikugo River estuary in Japan from May 2005 to December 2006. Hyperacanthomysis longirostris was the dominant mysid in the estuary, usually showing peaks of density and biomass in or close to the ETM (salinity 1-10). In addition, intra-specific differences (life-cycle stage, sex, and size) in horizontal distribution were found along the estuary. Larger males and females, particularly gravid females, were distributed upstream from the center of distribution where juveniles were overwhelmingly dominant. Juveniles increased in size toward the sea in marked contrast with males and females. The findings suggest a possible system of population maintenance within the estuary; gravid females release juveniles in the upper estuary, juveniles grow during downstream transport, young males and females mature during the upstream migration. Density and biomass were primarily controlled by seasonal changes of temperature, being high at intermediate temperatures (ca. 15-25 °C in late spring and fall) and being low at the extreme temperatures (ca. 10 °C in midwinter and 30 °C in midsummer). High density (up to 666 ind. m -3) and biomass (up to 168 mg dry weight m -3) of H. longirostris were considered to be comparable with those of copepods in the estuary.

  5. Observations and numerical modelling of a non-buoyant front in the Tay Estuary, Scotland

    Science.gov (United States)

    Neill, S. P.; Copeland, G. J. M.; Ferrier, G.; Folkard, A. M.

    2004-01-01

    Acoustic Doppler current profiler (ADCP) and density data have been collected for a section of front which consistently occurs on the flood tide along a break in bathymetry in the Tay Estuary. Lateral velocity shear in a vertical profile through the front was measured to be 0.52 s -1. An estuarine cross-sectional numerical model was developed with buoyancy-driven flow. Results from the numerical model showed that shears of such magnitude cannot be produced by buoyancy alone. Instead, a hypothesis was devised for the generation of the bathymetry-aligned front, and tested using the numerical model. The flooding current flows over sandbanks at the southern bank of the estuary and is then directed over (rather than along) the bathymetry break due to a sudden topographic restriction at the Tayport Narrows. Due to tidal phase effects, this overbank flow has a lower density than the ambient main channel water, hence behaving as a buoyant plume. The plume entrains higher density bottom water and a recirculation cell is set up in the lee of the bathymetry break. A surface convergent front occurs because a corresponding towards-bank flow (confirmed by field data) occurs in the centre of the channel. The numerical model was applied to this configuration using suitable initial and boundary conditions based on field observations. Lateral velocity profiles and the strength of shear show good agreement with the field data. It is suggested that the presence of a density gradient is required to generate the front but is not the main driving force.

  6. Proliferation of dinoflagellates in Kochi estuary, Kerala.

    Science.gov (United States)

    Kumar, M Ratheesh; Vishnu, S Raj; Sudhanandh, V S; Faisal, A K; Shibu, R; Vimexen, V; Ajmal, K; Aneesh, K S; Antony, Sibin; Krishnan, Anoop K

    2014-09-01

    Phytoplankton community structure and dynamics of Kochi estuary (bar mouth) have been studied seasonally. Three seasonal samplings namely pre-monsoon, monsoon and post-monsoon were made, and a wide variation was observed in phytoplankton community with respect to nutrients and other physicochemical parameters. Contrary to other seasons, dinoflagellate cell density increased during pre-monsoon season though species diversity was less pronounced (D > 0.15). Peridinium oceanicum was the dominant dinoflagellate during pre-monsoon season. Significant fluctuation in three principal nutrients namely total nitrogen, total phosphorous and silicate were observed during pre-monsoon (TP 40 micromol l(-1) and SiO4 3.20 micromol l(-1), TN 27 micromol l(-1)). Salinity values were also found to be high during pre-monsoon ( > 25 psu). Study suggests that variation in salinity and nutrient concentration during transition of seasons could result in succession of species, thereby causing change in phytoplankton community structure. High salinity and nitrogen values along with low values of silicate and phosphorous resulted in proliferation of dinoflagellates during pre-monsoon season.

  7. Assessment of trophic status in Changjiang (Yangtze) River estuary

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The integrated methodology for the assessment of estuarine trophic status (ASSETS),which was extended and refined from the United States National Estuarine Eutrophication Assessment (NEEA), is a multi-parameter assessment system and has been widely used in eutrophication assessment in estuarine and coastal waters. The ASSETS was applied to evaluate the trophic status of the Changjiang (Yangtze) River estuary, one of the largest estuaries in the world. The following main results were obtained: (i) The estuarine export potential is "moderate susceptibility" due to the "moderate" dilution potential and "moderate" flushing potential; (ii) The overall human influence (OHI) index classified the impact of nutrients in the system as "high" due to the high level of nutrient discharge by the river which channels anthropogenic impacts in the catchments to the estuarine system; (iii) The overall eutrophic condition (OEC) in the estuary was classified into the "high" category due to frequent occurrence of nuisance and toxic algal blooms in the mixing and seawater zones; (iv) Since the nutrient loadings (e.g.,DIN) in the river is expected to continue to increase in the near future following the population increase and rapid economic growth throughout the drainage basin, the nutrient-related symptoms in the estuary are likely to substantially worsen, which leads to the "worsen high" category for the definition of future outlook (DFO). The combinations of the three components (i.e., OHI, OEC, and DFO) lead to an overall grade as "bad" for the trophic status in the Changjiang River estuary.

  8. The behavior of dissolved inorganic selenium in the Changjiang Estuary

    Science.gov (United States)

    Chang, Yan; Zhang, Jing; Qu, Jianguo; Zhang, Guosen; Zhang, Anyu; Zhang, Ruifeng

    2016-02-01

    To investigate the behavior of inorganic selenium species in the Changjiang Estuary, samples were taken during summer (July 2011) and winter (March 2012). Dissolved inorganic selenium (DISe) concentrations averaged 1.79 nmol/L in summer and 1.24 nmol/L in winter; the average selenite [Se(IV)] to selenate [Se(VI)] ratio [Se(IV)/Se(VI)] was 0.42 in summer and 0.61 in winter. The data show that Se(IV) and Se(VI) concentrations in the estuary behaved strictly conservatively during winter but non-conservatively during summer due to adsorption by suspended particulate matter (SPM) and assimilation by phytoplankton. In addition, the Se concentration distributions in the Changjiang Estuary were controlled by three water masses, each with a specific Se(IV)/Se(VI) ratio "signature": the Changjiang Water input, the Taiwan Warm Current, and the Yellow Sea Coastal Current. The Se(IV) concentrations were related to the nitrate, silicate, and phosphate concentrations in the estuary. The DISe and Se(IV) concentrations were comparable to those found in other coastal regions and estuaries, which were considered to be natural levels.

  9. Metals in sediments and benthic organisms in the Mersey estuary

    Science.gov (United States)

    Langston, W. J.

    1986-08-01

    Concentrations of twelve metals were determined in sediments, seaweed ( Fucus vesiculosus), winkles ( Littorina littorea), polychaetes ( Nereis diversicolor), suspension feeding bivalves ( Mytilus edulis, Cerastoderma edule) and deposit feeding bivalves ( Macoma balthica, Scrobicularia plana) collected from the Mersey estuary between April 1980 and June 1984. Sediments and organisms in the Mersey are moderately contaminated with most of the metals measured, but mercury concentrations are consistently higher than in other United Kingdom estuaries. Comparisons with other sites in the North West of England indicate that mercury residues in organisms, though primarily dependent on sediment concentrations, are also influenced by complexation with particulate organic matter which reduces the availability of mercury. The biological availability of arsenic in Mersey sediments is similarly influenced by complexation with iron oxyhydroxides. Nereis diversicolor and Macoma balthica are the most suitable indicator species in terms of abundance and widespread distribution along the estuary, and, for the majority of metals, tissue concentrations increase upstream, reflecting corresponding gradients in sediment contamination. However mid-estuarine peaks for tin, chromium copper and nickel in Nereis indicate more localised inputs to the estuary. Correlations between lead in sediments and organisms are poor; it is suggested that hydrophilic alkyl lead compounds may be the predominant biologically available forms. Progressive reductions in mercury contamination in sediments and mercury and lead in organisms have occurred in recent years, which coincide with efforts to reduce inputs of these metals to teh Mersey estuary.

  10. Similarities between Yangshan Harbor area and the Yangtze estuary

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    By analysis of published papers on the Yangtze estuary and hydrological and sediments datain Yangshan Harbor area, many similarities are found between Yangshan Harbor area and the Yangtzeestuary. These similarities include the phenomenon of stagnating flow areas, the distributivecharacteristics of the highest suspended sediment concentration areas, superficial sediments and shoalbars. The stagnating flow area is the major similarity which causes other similarities. These similaritiesindicate that: 1) Turbidity Maximum and mouth bars in estuaries are mainly caused by the hydraulicbalance of stagnating flow areas of estuaries; 2) The stagnating sand area of sands caused by stagnatingflow area often locates on the narrower side of the stagnating flow area; 3) The location (or shape) offine sediments area caused by stagnating flow area reflects the location (or shape) of the stagnatingflow area. Both Yangshan Harbor area and the Yangtze estuary are the important developmental areasin the future (man-made similarity). In-depth studies on these similarities between Yangshan Harborarea and the Yangtze estuary will have momentous theoretical and practical significance.

  11. Functional diversity of fish in estuaries at a global extent

    Directory of Open Access Journals (Sweden)

    Rita P Vasconcelos

    2015-10-01

    Full Text Available Biodiversity is currently viewed as a framework encompassing multiple facets of the variety of life, including taxonomic and functional aspects. Species richness and composition of fish assemblages in estuaries is defined by global to local processes acting on community colonization. The present study further investigates how biodiversity of fish assemblages varies among estuaries globally, by simultaneously analysing taxonomic and functional richness and diversity of assemblages. A comprehensive worldwide database was compiled on the fish assemblage composition and environmental characteristics of estuaries. In addition, functional attributes of the fish species were characterized such as body size, habitat use and trophic ecology. We investigated the relationship between taxonomic and functional aspects of biodiversity, i.e. the match or mismatch between the two. We also explored how functional diversity of fish assemblages varied among estuaries globally and related to environmental features of estuaries, i.e. historic and contemporary, global and local constraints. The results are explored in the context of ecosystem functioning and resilience, and outcomes relevant to assist in prioritizing conservation efforts are highlighted.

  12. Eco-Morphological Problems in the Yangtze Estuary and the Western Scheldt

    NARCIS (Netherlands)

    Vriend, de H.J.; Wang, Z.B.; Ysebaert, T.; Herman, P.M.J.; Ding, P.X.

    2011-01-01

    This paper compares the Yangtze Estuary in China and the Western Scheldt Estuary in The Netherlands by their morphodynamic and ecological systems, their engineering works and estuarine management issues, and the major challenges in studying them. Physically speaking, the two estuaries are very diffe

  13. Afinidades biológicas entre muestras tardías del norte de Patagonia y regiones vecinas establecidas mediante rasgos no métricos craneofaciales

    Directory of Open Access Journals (Sweden)

    Del Papa, Mariano C.

    2005-01-01

    Full Text Available En el marco de una investigación orientada a evaluar la dinámica evolutiva de las poblaciones del norte de Patagonia durante el Holoceno Tardío, se están relevando en la actualidad diversos indicadores, entre los cuales se cuentan los rasgos no métricos. El objetivo de este trabajo es presentar los resultados parciales obtenidos a partir del análisis de variables no métricas craneofaciales en muestras del norte de Patagonia y áreas vecinas (sur de Patagonia, sur de Mendoza y S.E. de la Región Pampeana. Se analizaron individuos adultos (i.e. >20 años al momento de morir de ambos sexos. Como criterio para separar a las muestras cronológicamente, se utilizó la presencia y tipo de deformación craneana artificial, un indicador temporal eficiente en una escala regional y supraregional. Para la estimación de las distancias biológicas, se realizaron análisis de correspondencia (AC y de componentes principales (CP sobre distancias euclidianas y cálculo de la medida media de divergencia de Smith (MMD. En términos globales, los resultados obtenidos indican que las submuestras procedentes del valle inferior del Río Negro presentan los mayores grados de afinidad, sugiriendo una mayor continuidad en el poblamiento regional en relación con otras áreas.

  14. La democracia mexicana, presa de una cultura política con rasgos autoritarios Mexican Democracy, Overcome by a Political Culture with Authoritarian Features

    Directory of Open Access Journals (Sweden)

    María Aidé Hernández

    2008-06-01

    Full Text Available A pesar de las transformaciones políticas que han ocurrido en México durante los últimos 20 años, la cultura política del mexicano ha dejado ver pocos avances. Actualmente siguen predominando características que no fomentan una participación autónoma y propositiva que ayude al éxito de la democracia. Entre ellas destacan el conocimiento e interés por la política; la confianza interpersonal, en las instituciones y en la democracia; la tolerancia; y la competencia subjetiva. Este panorama propicia que sigan prevaleciendo rasgos autoritarios como el clientelismo y el corporativismo, los cuales no fortalecen la democracia. Los pequeños cambios culturales se han dado en el ámbito electoral, donde no sólo hay una gran aceptación a la pluralidad y competencia entre los partidos políticos: ahora los ciudadanos consideran el voto ya no como un derecho sino como un arma política.In spite of the political transformations occurred in Mexico during the last 20 years, the Mexican citizen's political culture has shown few improvements, since certain characteristics keep on prevailing and do not encourage an autonomous participation contribuing to the success of the democratic process. Some of the most relevant advances for such process are knowledge and interest in politics; confidence in the interpersonal relationships, in institutions and in democracy; tolerance; and subjective competence. Their absence favours the prevalence of authoritarian features as clientelism and corporativism. Small cultural changes have taken place in the electoral domain though, where there is a great acceptance of plurality and competition among the political parties and citizens consider suffrage not as a right but as a political weapon.

  15. Aptitud Física y su Relación con Rasgos Depresivos en Personas Adultas Mayores que Realizan Actividad Física

    Directory of Open Access Journals (Sweden)

    Mynor Rodríguez-Hernández

    2014-08-01

    Full Text Available El propósito de esta investigación fue determinar la relación entre la aptitud física y los niveles depresivos en las personas adultas mayores que participan en programas de actividad física en el área de San Ramón, Alajuela. Un total de 138 personas mayores con edades entre los 60 y 86 años (67.94 ± 5.26 años, fueron medidas en los componentes de la aptitud física mediante la prueba “Senior Fitness Test” (SFT y los niveles de depresión mediante la Escala de Depresión Geriátrica de “Yesavage” (GDS, “Geriatric Depression Scale” por sus siglas en Inglés. Los resultados sugieren que el 97,8 % de las personas analizadas se ubicó dentro de los parámetros normales y excelentes de aptitud física, mientras tanto, el 86,2 % se encontró en la etapa normal de la depresión. Por su parte, la depresión geriátrica correlacionó negativamente con la aptitud física en las variables: fuerza muscular y resistencia corporal de la parte baja del cuerpo, resistencia de la fuerza muscular del brazo, la agilidad y equilibrio dinámico, y flexibilidad parte baja del cuerpo (p <0,05. Se concluye que a mayor nivel de aptitud física menor son los rasgos depresivos en personas adultas mayores.

  16. Ambiente juvenil: discurso ambiental entre jóvenes universitarios.

    OpenAIRE

    Quinn-Anderson, William C.

    2008-01-01

    Esta tesis pretende hacer una aportación al conocimiento del medio ambiente del occidente de México, específicamente de la zona metropolitana de Guadalajara, a partir del estudio de la cultura ambiental manifestada en el discurso de los jóvenes universitarios del ITESO. La apuesta es que puede ser provechoso considerar dentro del concepto de “medio ambiente” no solamente componentes bióticos y abióticos, sino también elementos socioculturales como cultura y significado. Es evidente que hay in...

  17. Impact of the Clean Water Act on the levels of toxic metals in urban estuaries: The Hudson River estuary revisited

    Energy Technology Data Exchange (ETDEWEB)

    Sanudo-Wilhelmy, S.A.; Gill, G.A.

    1999-10-15

    To establish the impact of the Clean Water Act on the water quality of urban estuaries, dissolved trace metals and phosphate concentrations were determined in surface waters collected along the Hudson River estuary between 1995 and 1997 and compared with samples collected in the mid-1970s by Klinkhammer and Bender. The median concentrations along the estuary have apparently declined 36--56% for Cu, 55--89% for Cd, 53--85% for Ni, and 53--90% for Zn over a period of 23 years. These reductions appear to reflect improvements in controlling discharges from municipal and industrial wastewater treatment plants since the Clean Water Act was enacted in 1972. In contrast, levels of dissolved nutrients (PO{sub 4}) have remained relatively constant during the same period of time, suggesting that wastewater treatment plant improvements in the New York/New Jersey Metropolitan area have not been as effective at reducing nutrient levels within the estuary. While more advanced wastewater treatment could potentially reduce the levels of Ag and PO{sub 4} along the estuary, these improvements would have a more limited effect on the levels of other trace metals.

  18. Attenuation of rare earth elements in a boreal estuary

    Science.gov (United States)

    Åström, Mats E.; Österholm, Peter; Gustafsson, Jon Petter; Nystrand, Miriam; Peltola, Pasi; Nordmyr, Linda; Boman, Anton

    2012-11-01

    This study focuses on attenuation of rare earth elements (REE) when a boreal creek, acidified and loaded with REE and other metals as a result of wetland drainage, empties into a brackish-water estuary (salinity MINTEQ version 3.0 and the Stockholm Humic Model after revision and updating, predicted that the dissolved (<0.45 μm) REE pool in the estuary is bound almost entirely to humic substances. Acid sulphate soils, the source of the REE and other metals in the creek water, are widespread on coastal plains worldwide and therefore the REE attenuation patterns and mechanisms identified in the studied estuary are relevant for recognition of similar geochemical processes and conditions in a variety of coastal locations.

  19. Spring climate and salinity in the San Francisco Bay Estuary

    Science.gov (United States)

    Cayan, Daniel R.; Peterson, David H.

    1993-01-01

    Salinity in the San Francisco Bay Estuary almost always experiences its yearly maximum during late summer, but climate variability produces marked interannual variations. The atmospheric circulation pattern impacts the estuary primarily through variations of runoff from rainfall and snowmelt from the Sierra Nevada and, secondarily, through variations in the near-surface salinity in the coastal ocean. While winter precipitation is the primary influence upon salinity in the estuary, spring climate variations also contribute importantly to salinity fluctuations. Spring atmospheric circulation influences both the magnitude and the timing of freshwater flows, through anomalies of precipitation and temperature. To help discriminate between the effects of these two influences, the record is divided into subsets according to whether spring conditions in the region are cool and wet, warm and wet, cool and dry, or warm and dry. Warm springs promote early snowmelt-driven flows, and cool springs result in delayed flows. In addition to effects of winter and spring climate variability operating on the watershed, there are more subtle effects that are transmitted into the estuary from the coastal ocean. These influences are most pronounced in cool and dry springs with high surface salinity (SS) in the coastal ocean versus cool and wet springs with low SS in the coastal ocean. A transect of SS records at stations from the mouth to the head of the bay suggests that the coastal ocean anomaly signal is attenuated from the mouth to the interior of the estuary. In contrast, a delayed, postsummer signal caused by winter and spring runoff variations from the upstream watershed are most pronounced at the head of the estuary and attenuate toward the mouth.

  20. Modelling sediment transport processes in macro-tidal estuary

    Institute of Scientific and Technical Information of China (English)

    Rauen; William; B.

    2009-01-01

    This paper outlines a numerical modeling study to predict the sediment transport processes in a macro-tidal estuary, namely the Mersey Estuary, UK. An integrated numerical model study is conducted to investigate the interaction between the hydrodynamic, morphological and sediment transport processes occurring in the estuary. The numerical model widely used in environmental sediment transport studies worldwide, namely ECOMSED is used to simulate flow and sediment transport in estuary. A wetting and drying scheme is proposed and applied to the model, which defines "dry" cells as regions with a thin film of fluid O (cm). The primitive equations are solved in the thin film as well as in other regular wet cells. A model for the bed load transport is included in the code to account for the dynamics of the mobile bed boundary. The bed evolution due to bed load transport which is calculated according to van Rijn (1984a) is obtained by solving the sediment mass-balance equation. An estuary-related laboratory flume experiment is used to verify the model. Six sets of field measured hydrodynamic data are used to verify the corresponding predictions of the model, with the model-predicted water elevations and salinity levels generally agreeing well with the field measurements. The numerical model results show that in the Mersey Estuary both the tidal level and river discharge affect significantly the sediment transport. Reasonable agreement between the model results and field data has been obtained, indicating that the model can be used as computer-based tool for the environment management of estuarine system.

  1. Mud transport in the Microtidal San Jacinto Estuary

    Science.gov (United States)

    Salehi, M.

    2013-12-01

    The overall objective of this research is to better understand the sediment transport processes in the microtidal San Jacinto Estuary (near Houston, TX) under variable hydrologic conditions. A numerical modeling approach is selected to answer the main question of; how will changes in freshwater input change the sedimentation pattern of the region? In this computational work, no new numerical method or code is developed, but rather an existing technology (MIKE 3D developed by DHI) is used to build a virtual San Jacinto Estuary laboratory where boundary conditions could be applied and altered to the domain to observe the general functional response of the system. Two synthetic freshwater inflows, simulating dry and wet conditions, were used in the numerical modeling experiments. Simulations showed that change in freshwater inflow has major impact on the salinity magnitude within the estuary. In dry conditions, the 5 ppt isohaline traveled all the way upstream of Morgans Point, almost to the confluence of San Jacinto River with Buffalo Bayou. During the extreme wet weather conditions, the 5 ppt isohaline of the surface water was pushed almost as far as Galveston Island. Overall erosion and deposition pattern showed little change between extreme dry and wet years. In general, part of the shallow areas experienced erosion whereas deeper parts of the estuary were under deposition. High freshwater inflow caused around 30% higher deposition in some parts of the channel compared with the low freshwater. Furthermore, examining the mass balance within the whole San Jacinto Estuary showed that around 28% of the input sediment was flushed out during the wet season. But in dry season, not only no sediment left the domain but also it received around 17% of the total available sediment within the estuary from the shelf.

  2. Conhecimento, interdisciplinaridade e Psicologia Ambiental

    Directory of Open Access Journals (Sweden)

    Ombretta Romice

    2005-01-01

    Full Text Available Responde às questões - como os métodos da Psicologia Ambiental devem ser discutidos em um enquadramento interdisciplinar; a Psicologia Ambiental pede alguma abordagem metodológica especial; como a intervenção ambiental é determinada pela interdisciplinaridade; quais são estas disciplinas e como elas se relacionam entre si - baseando-se em experiências profissionais como orientador em um projeto com comunidade, com habitação popular e exclusão social em vários países da Europa, e como consultora. Conclui que as abordagens usadas pelas diferentes profissões são muito separadas, e que apenas metas comuns não são suficientes, sendo também necessários um treino conjunto e identidade de valores.

  3. The Ob Estuary (Kara Sea) Coastal Dynamics Interannual Variability Assessment

    Science.gov (United States)

    Kopa-Ovdienko, N.; Volobueva, N.; Ogorodov, S.

    2012-04-01

    There are several promising gas fields in the Ob Estuary. For their development comprehensive research, including coastal dynamics assessment, is required. To estimate current and speak about future coastal dynamics rates we need to investigate its interannual variability connecting it with variability of major coastal dynamics factors. It is known that in this region one of the main coastal dynamics factors is wave action, which, in turn, depends on wind velocity and direction. Wind data for ice-free period were derived from nearby hydro-meteorological stations. The research was conducted for two sections of the Ob Estuary coast. One section is located on the eastern coast of the estuary (Taz peninsula); the other is located on the western one (Yamal peninsula). Each of these sections is 10 km length. For key-sites of the coast wave-dangerous rhumbs were determined. For ice-free period of each year accumulated summer storm duration (ASSD) - number of hours with strong winds (≥10 m/s) from wave-dangerous directions - was calculated for both sections of coast. Supposing that coast retreat rate is proportional to number of hours with strong winds from wave-dangerous rhumbs, we can approximately assess interannual variability of coast retreat rate. Our research revealed that: 1)There are significant (from hours to a few hundreds of hours) differences in ASSD from year to year due to short ice-free period and high variability of wind velocity and direction. So, we can expect sharp interannual differences in coastal retreat rate. 2)The duration of strong winds from wave-dangerous rhumbs during ice-free period is more on the eastern coast of the estuary than on the western. This goes from the predominance of northern and northwestern winds during ice-free period. These winds cause waves leading to coastal erosion on the eastern coast of estuary and don't cause such waves on the western one. However, we can't draw conclusions about the comparative rates of coastal

  4. Validating Firewalls in Mobile Ambients

    DEFF Research Database (Denmark)

    Nielson, Flemming; Nielson, Hanne Riis; Hansen, René Rydhof

    1999-01-01

    The ambient calculus is a calculus of computation that allows active processes (mobile ambients) to move between sites. A firewall is said to be protective whenever it denies entry to attackers not possessing the required passwords. We devise a polynomial time algorithm for rejecting proposed...... firewalls that are not guaranteed to be protective. This is based on a control flow analysis for recording what processes may turn up inside what other processes; in particular, we develop a syntax-directed system for specifying the acceptability of an analysis, we prove that all acceptable analyses...

  5. Ambient cosmology and spacetime singularities

    CERN Document Server

    Antoniadis, Ignatios

    2015-01-01

    We present a new approach to the issues of spacetime singularities and cosmic censorship in general relativity. This is based on the idea that standard 4-dimensional spacetime is the conformal infinity of an ambient metric for the 5-dimensional Einstein equations with fluid sources. We then find that the existence of spacetime singularities in four dimensions is constrained by asymptotic properties of the ambient 5-metric, while the non-degeneracy of the latter crucially depends on cosmic censorship holding on the boundary.

  6. Ambient cosmology and spacetime singularities

    Energy Technology Data Exchange (ETDEWEB)

    Antoniadis, Ignatios [Bern University, Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, Bern (Switzerland); Ecole Polytechnique, Palaiseau (France); Cotsakis, Spiros [CERN, Theory Division, Department of Physics, Geneva 23 (Switzerland); National Technical University, School of Applied Mathematics and Physical Sciences, Athens (Greece)

    2015-01-01

    We present a new approach to the issues of spacetime singularities and cosmic censorship in general relativity. This is based on the idea that standard 4-dimensional spacetime is the conformal infinity of an ambient metric for the 5-dimensional Einstein equations with fluid sources. We then find that the existence of spacetime singularities in four dimensions is constrained by asymptotic properties of the ambient 5-metric, while the non-degeneracy of the latter crucially depends on cosmic censorship holding on the boundary. (orig.)

  7. Medio ambiente y responsabilidad social

    OpenAIRE

    2012-01-01

    Las organizaciones, dentro de los procesos de responsabilidad social y con el fin de mejorar la calidad de vida de las comunidades que impactan, han optado por proteger y preservar el medio ambiente de acuerdo a ciertos protocolos y normas internacionales que generan una cultura al respecto. Este cuaderno de investigación aborda la norma ISO 26000, la cual asume el tema de la Responsabilidad Social Empresarial (RSE) en materia de medio ambiente y es una guía para ser implementada en las orga...

  8. Los estudios sobre el ambiente y la ciencia ambiental

    Directory of Open Access Journals (Sweden)

    Amelia Nancy Giannuzzo

    2010-03-01

    Full Text Available La existencia de la ciencia ambiental es reconocida en libros, revistas de publicación científica y carreras de grado y posgrado. Sin embargo, se desconoce su existencia en forma literal o indirecta, al no ser considerado su aporte, por ejemplo, en los planteos referidos sobre la ciencia y la tecnología de la sustentabilidad. En este trabajo se presentan estos antecedentes, relacionándolos con el objetivo del mismo, que es el de aportar a la dilucidación de la existencia y conformación de la ciencia ambiental. Para esto, se analiza la relación de las disciplinas con la dimensión compleja del ambiente como objeto de estudio y aspectos metodológicos derivados. A los fines de aportar al esclarecimiento conceptual, se identifican las distintas acepciones de ambiente comúnmente referidas en la bibliografía. Además, se discuten aspectos relacionados de multidisciplinariedad, interdisciplinariedad y transdisciplinariedad, y sobre el status epistémico de la ciencia ambiental. Se concluye que una mayor precisión conceptual embasada en un marco compartido por las disciplinas que estudian el ambiente, incluida la ciencia ambiental, y los distintos actores involucrados en las problemáticas ambientales, favorecerá el refinamiento de las metodologías tendientes a disminuir la fragmentación de las investigaciones concernientes y las aplicaciones para su resolución.The existence of an environmental science is recognized in books, journals of science as well as in undergraduate and graduate studies. Its existence, however, is unknown either literally or indirectly when, for instance, its contribution to topics connected to the science and technology of sustainability is not considered. This background is presented in this paper and connected to its objective, which is to elucidate the existence and structure of the environmental science. To this goal, I analyse the relationship of the disciplines with the complex dimension of the environment

  9. Research, Monitoring, and Evaluation for the Federal Columbia River Estuary Program

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Diefenderfer, Heida L.; Ebberts, Blaine D.; Tortorici, Cathy; Yerxa, Tracey; Leary, J.; Skalski, John R.

    2008-02-05

    The purpose ofthis document is to describe research, monitoring, and evaluation (RME) for the Federal Columbia River Estuary Program. The intent of this RME effort is to provide data and information to evaluate progress toward meeting program goals and objectives and support decision-making in the Estuary Program. The goal of the Estuary Program is to understand, conserve, and restore the estuary ecosystem to improve the performance of listed salmonid populations. The Estuary Program has five general objectives, designed to fulfill the program goal, as follows. 1. Understand the primary stressors affecting ecosystem controlling factors, such as ocean conditions and invasive species. 2. Conserve and restore factors controlling ecosystem structures and processes, such as hydrodynamics and water quality. 3. Increase the quantity and quality of ecosystem structures, i.e., habitats, juvenile salmonids use during migration through the estuary. 4. Maintain the food web to benefit salmonid performance. 5. Improve salmonid performance in terms of life history diversity, foraging success, growth, and survival. The goal of estuary RME is to provide pertinent and timely research and monitoring information to planners, implementers, and managers of the Estuary Program. In conclusion, the estuary RME effort is designed to meet the research and monitoring needs of the estuary Program using an adaptive management process. Estuary RME's success and usefulness will depend on the actual conduct of adaptive management, as embodied in the objectives, implrementation, data, reporting, and synthesis, evaluation, and decision-making described herein.

  10. The recovery of oyster (Saccostrea glomerata) populations in Sydney estuary (Australia).

    Science.gov (United States)

    Birch, G F; Scammell, M S; Besley, C H

    2014-01-01

    The current work documented a significant and widespread increase in the abundance of the Sydney rock oyster Saccostrea glomerata, in Sydney estuary (Australia) by undertaking surveys of oyster density in the estuary in 1989 and annually from 1994 to 2006. Oyster density at six control sites located in nearby National Parks unaffected by boating and stormwater discharges were compared to 17 study sites widely distributed within Sydney estuary. No oyster populations were evident in Sydney estuary in 1989; however, by 1994 oysters had colonised areas of the lower and central estuary and by 2002 densities were statistically similar to control sites. The timing of estuary-wide increases in oyster abundance suggests that the partial banning of tributyltin in 1989 for vessels under 25 m long may have played a major role in the increase of S. glomerata in this estuary.

  11. Observation of saltwater intrusion and ETM dynamics in a stably stratified estuary: the Yangtze Estuary, China.

    Science.gov (United States)

    Wan, Yuanyang; Zhao, Dezhao

    2017-02-01

    Spatial and temporal measurement data describing spring-neap variations of velocity, salinity, and suspended sediment concentration (SSC) in the North Passage Deepwater Navigational Channel (DNC) of the Yangtze Estuary, China, were obtained in the wet season of 2012. These data were collected in the middle of the DNC and apparently document the formation of a rather stable density stratification interface and salt wedge, especially during neap tides and slack waters. The convergent zone of residual currents, salinity transport, and sediment transport during neap and spring tides oscillates in the middle and lower reach of the DNC. It encourages the formation of a near-bed high-SSC layer, which favours siltation in the dredged channel. Both the near-bed gradient Richardson number and the bulk/layer Richardson number vary dramatically from around zero to several hundred from spring to neap tides. Stratification and turbulence damping effects near the estuarine turbidity maximum (ETM) area induce the upper half (near water surface) of the water body to be ebb-dominant and the lower part (near-bed) to be flood-dominant, which is a previously undocumented phenomenon in this region. These data reveal that the residual pattern of currents, salt flux and sediment flux are of critical differences in a stratified estuary, and that the salinity-induced baroclinic pressure gradient is a major factor controlling the vertical velocity structure. In addition, field observations indicate that the salinity and sediment transport of residuals generated by internal tidal asymmetry plays a dominant role in maintaining a stable density stratification interface near the estuarine front.

  12. Temporal variability of phytoplankton in a salt wedge estuary, the Swan-Canning Estuary, Western Australia

    Science.gov (United States)

    Thompson, Peter A.

    2001-09-01

    The temporal cycles of variation in salinity, temperature and river flow in the Swan-Canning Estuary plus rainfall in the vicinity are examined. A normal pattern is defined for rainfall and river flow based on long-term median monthly values from available historical data. Long-term monthly median rainfall and median monthly river flow were highly correlated. Deviations from the normal patterns of rainfall and river flow are documented. Three years of detailed data on the temporal distribution of the algal biomass and phytoplankton community composition from the Swan-Canning Estuary are presented and discussed. Significant interannual variability in the phytoplankton biomass was observed with 1996 having a significantly lower median chlorophyll a concentration than 1995 or 1997. Different years also had pronounced differences in the timing, persistence and occurrence of algal blooms. Links with, and between, rainfall, river flow, nutrient concentrations and phytoplankton biomass are made by careful examination of the temporal patterns. Deviations from the proposed normal temporal pattern of physical and chemical environmental factors relevant to the growth of phytoplankton biomass are assessed. Deviations from normal rainfall and river flow, depending upon their timing and intensity, appear to be associated with occurrence of algal blooms. For example, the lack of a dinoflagellate bloom in December 1996 or January 1997 appears to be associated with a wetter than normal spring. Based upon the observed data, published reports and basic principles of algal ecology a set of predicted responses to variation in the major environmental variables (rainfall and river flow) are tabulated. The tabulated predictions are proposed as a useful tool for resource managers.

  13. Abstract Interpretation of Mobile Ambients

    DEFF Research Database (Denmark)

    Hansen, René Rydhof; Jensen, J. G.; Nielson, Flemming

    1999-01-01

    We demonstrate that abstract interpretation is useful for analysing calculi of computation such as the ambient calculus (which is based on the p-calculus); more importantly, we show that the entire development can be expressed in a constraint-based formalism that is becoming exceedingly popular...

  14. Nanomaterials vs Ambient Ultrafine Particles

    DEFF Research Database (Denmark)

    Stone, Vicki; Miller, Mark R.; Clift, Martin J. D.

    2016-01-01

    BACKGROUND: A rich literature exists that has demonstrated adverse human health effects following exposure to ambient air particulate matter (PM), with strong support for an important role for ultrafine (nano-sized) particles. At present, relatively little human health or epidemiology data exists...

  15. Shape analysis for mobile ambients

    DEFF Research Database (Denmark)

    Nielson, Hanne Riis; Nielson, Flemming

    2001-01-01

    The ambient calculus is a calculus of computation that allows active processes to move between sites. We present an analysis inspired by state-of-the-art pointer analyses that safely and accurately predicts which processes may turn up at what sites during the execution of a composite system...

  16. Shape analysis for Mobile Ambients

    DEFF Research Database (Denmark)

    Nielson, Hanne Riis; Nielson, Flemming

    2000-01-01

    The ambient calculus is a calculus of computation that allows active processes to move between sites. We present an analysis inspired by state-of-the-art pointer analyses that safety and accurately predicts which processes may turn up at what sites during the execution of a composite system...

  17. Digital identity in ambient environments

    NARCIS (Netherlands)

    Schouten, Ben; Ambekar, Onkar

    2006-01-01

    Embedded systems and ambient technology enable users to interact at any time and anywhere. In the BASIS project for identity management, CWI investigates transparent biometrics in home environments. Possible application areas are user profiling for shopping , listening to one's favourite music and o

  18. La crisis del medio ambiente

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quintero Vélez

    2013-07-01

    Full Text Available Este artículo, introducción al tema del medio ambiente, pretende proporcionar conceptos básicos para analizar y dimensionar el impacto que genera el hombre sobre los sistemas que soportan la vida. Para entender estos problemas, es indispensable partir de un análisis básico de la relación entre el hombre actual, su medio ambiente, sus necesidades y sus actividades. El autor revisa los antecedentes, las causas y las consecuencias de la crisis ambiental internacional, e intenta dar explicación a la problemática nacionalen este campo, y establecer los puntos más críticos en Colombia. Finalmente, con base en los parámetros establecidos por el gobierno, se presenta el concepto de“desarrollo sostenible" como modelo que interrelaciona los procesos económicos, sociales y tecnológicos con el medio ambiente.

  19. Risky behavior, personality traits and road accidents among university students Comportamiento de riesgo, rasgos de personalidad y accidentes de carretera en estudiantes universitarios.

    Directory of Open Access Journals (Sweden)

    Aristides I. Ferreira

    2009-06-01

    Full Text Available The personality traits that mediate risky driving and accidents among university students drivers were investigated. Study 1 (N=132 tested for the relation between risky behaviors and personality (16PF-5 second order dimensions. Three factors were extracted concerning risky driving: driving errors of commission, distraction, and driving errors of omission. Individuals with low self-control and high levels of anxiety were more prone to commit distractive behavior and driving errors of omission. Low self-control and high independence levels were associated with driving errors of commission. In study 2 (N=540, we tested if the number of road accidents for which an individual has been responsible was related to risky driving behavior. Drivers who committed more accidents presented higher scores in three new risky driving factors obtained: reckless driving, impaired concentration and division of attention.

    Key words: Risky driving, personality, accidents, behavior.
    En este estudio se investigaron los rasgos de personalidad relacionados con la conducción de riesgo y los accidentes en estudiantes universitarios. El primer estudio (N=132 evaluó la relación entre los comportamientos de riesgo y la personalidad (16PF-5 dimensiones de segundo orden. Tres factores fueron extraídos en relación con la conducción de riesgo: cometer errores de conducción, distracción, errores de omisión en la conducción. Los individuos con bajo autocontrol y altos niveles de ansiedad eran más propensos a tener comportamientos distractores y cometer errores de omisión en la conducción. Mientras que sujetos con bajo autocontrol y altos niveles de independencia se asociaron con el factor cometer errores de conducción. En el segundo estudio (N=540 evaluamos si el número de accidentes de tráfico, de los que una persona ha sido responsable, está relacionado con el comportamiento de riesgo en la conducción. Los resultados muestran que los conductores

  20. Phenology of larval fish in the St. Louis River estuary

    Science.gov (United States)

    Little work has been done on the phenology of fish larvae in Great Lakes coastal wetlands. As part of an aquatic invasive species early detection study, we conducted larval fish surveys in the St. Louis River estuary (SLRE) in 2012 and 2013. Using multiple gears in a spatially ba...

  1. Anthropogenic tritium in the Loire River estuary, France

    Science.gov (United States)

    Péron, O.; Gégout, C.; Reeves, B.; Rousseau, G.; Montavon, G.; Landesman, C.

    2016-12-01

    This work is carried out in the frame of a radioecological monitoring of anthropogenic tritium from upstream and downstream of several nuclear power plants along the Loire River to its estuary. This paper studies the variation of anthropogenic tritium species in the Loire River system from upstream to the mouth of the estuary. Tritiated water (HTO and HTO in sediment pore water) and organically bound tritium (OBT) forms were analysed after dedicated pre-treatments. The collected environmental samples consist in (i) surface-sediment and core samples from the river floor, (ii) surface and water column samples. A maximum 3H activity concentration of 26 ± 3 Bq·L- 1 in the Loire River estuary is obtained whereas an environmental background level around 1 Bq·L- 1 is determined for a non influenced continental area by anthropogenic activities. The European follow-up indicator used as a screening value is 100 Bq·L- 1. The conservative tritium behaviour was used in order to characterize the tidal regime and river flow influences in the mixing zone of the Loire River estuary. Furthermore, OBT levels and total organically carbon (TOC) content are explored. Finally, ratios of OBT relative to HTO in sediment pore water in surface-sediment and core samples are also discussed.

  2. Flushing characteristics of Amba river estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    DineshKumar, P.K.; Sarma, R.V.; Josanto, V.

    Tide dominated Amba River Estuary was studied to evaluate its flushing characteristics. Although, spring tidal range of 3.4 m was observed at 40 km inland, the seawater component here at high tide was less than 1%. The wet weather flushing time...

  3. ASSESSING THE ECOLOGICAL CONDITION OF VERACRUZ, MEXICO ESTUARIES

    Science.gov (United States)

    Macauley, John, Hector A. Vasquez, George Craven and P. Thomas Heitmuller. In press. Assessing the Ecological Condition of Veracruz, Mexico Estuaries (Abstract). To be presented at the EPA Science Forum: Healthy Communities and Ecosystems, 1-3 June 2004, Washington, DC. 1 p. (ERL...

  4. ASSESSING THE ECOLOGICAL CONDITION OF VERACRUZ, MX ESTUARIES

    Science.gov (United States)

    As part of an international technology transfer activity between EPA's Office of Research and Development and the state of Veracruz's Sub-secretary of the Environment, 50 stations within estuaries along the gulf coast of the state of Veracruz MX, were sampled during June and July...

  5. Spatial modeling on the nutrient retention of an estuary wetland

    NARCIS (Netherlands)

    Li, X.; Xiao, D.; Jongman, R.H.G.; Harms, W.B.; Bregt, A.K.

    2003-01-01

    There is a great potential to use the estuary wetland as a final filter for nutrient enriched river water, and reduce the possibility of coastal water eutrophication. Based upon field data, spatial models were designed on a stepwise basis to simulate the nutrient reduction function of the wetland in

  6. Correspondence between zooplankton assemblages and the Estuary Environment Classification system

    Science.gov (United States)

    Lucena-Moya, Paloma; Duggan, Ian C.

    2017-01-01

    We tested whether variability in zooplankton assemblages was consistent with the categories of estuarine environments proposed by the 'Estuary Environment Classification' system (EEC) (Hume et al., 2007) across a variety of North Island, New Zealand, estuaries. The EEC classifies estuaries in to eight categories (A to F) based primarily on a combination of three abiotic controlling factors: ocean forcing, river forcing and basin morphometry. Additionally, we tested whether Remane's curve, which predicts higher diversities of benthic macrofauna and high and low salinities, can be applied to zooplankton assemblages. We focused on three of the eight EEC categories (B, D and F), which covered the range of estuaries with river inputs dominating (B) to ocean influence dominating (F). Additionally, we included samples from river (FW) and sea (MW) to encompass the entire salinity range. Zooplankton assemblages varied across the categories examined in accordance with a salinity gradient predicted by the EEC. Three groups of zooplankton were distinguishable: the first formed by the most freshwater categories, FW and B, and dominated by rotifers (primarily Bdelloidea) and estuarine copepods (Gladioferans pectinatus), a second group formed by categories D and F, of intermediate salinity, dominated by copepods (Euterpina acutifrons), and a final group including the purely marine category MW and dominated also by E. acutifrons along with other marine taxa. Zooplankton diversity responded to the salinity gradient in a manner expected from Remane's curve. The results of this study support others which have shown salinity to be the main factor driving zooplankton community composition and diversity.

  7. Biogeochemistry of Nutrient Elements in the Changjiang (Yangtze River) Estuary

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Based on the biogeochemical studies on nutrient elements in the Changjiang estuary,the main results and recent progresses are reviewed in this paper, such as the nutrient fluxes into the sea, the mixing behaviors, the distribution characteristics and transportation as well as the biogeochemical behaviors of nutrients in the plume frontal region. The exploring directions and research emphases in the future are proposed.

  8. ECOLOGICAL CONDITION OF THE ESTUARIES OF OREGON AND WASHINGTON

    Science.gov (United States)

    Estuaries are bodies of water that receive freshwater and sediment from rivers and saltwater from the oceans. They are transition zones between the fresh water of a river and the salty environment of the sea. This interaction produces a unique environment that supports wildlife...

  9. Optical Changes in a Eutrophic Estuary During Reduced Nutrient Loadings

    DEFF Research Database (Denmark)

    Pedersen, Troels Møller; Sand-Jensen, Kaj; Markager, Stiig

    2014-01-01

    Loss of water clarity is one of the consequences of coastal eutrophication. Efforts have therefore been made to reduce external nutrient loadings of coastal waters. This paper documents improvements to water clarity between 1985 and 2008–2009 at four stations in the microtidal estuary Roskilde Fj...

  10. Laboratory Investigations on Estuary Salinity Mixing: Preliminary Analysis

    Directory of Open Access Journals (Sweden)

    F. H. Nuryazmeen

    2014-05-01

    Full Text Available Estuaries are bodies of water along the coasts that are formed when fresh water from rivers flows into and mixes with salt water from the ocean. The estuaries serve as a habitat to some aquatic lives, including mangroves. Human-induced activities such as dredging of shipping lanes along the bottom estuarine, the disposal of industrial wastes into the water system and shoreline development influence estuarine dynamics which include mixing process. These activities might contribute to salinity changes and further adversely affect the estuarine ecosystem. In order to study at the characteristics of the mixing between salt water (estuary and freshwater (river, a preliminary investigation had been done in the laboratory. Fresh water was released from one end of the flume and overflowing at weir at the other end. Meanwhile, salt water was represented by the red dye tracer released through a weir and intruded upstream as a gravity current. The isohalines are plotted to see the salinity patterns. Besides, to examine the spatial and temporal salinity profiles along the laboratory investigations, the plotted graphs have been made. The results show that the changes in salinity level along the flume due to mixing between fresh water and salt water. This showed typical salt-wedge estuary characteristics.

  11. Maturation of Metapenaeus moyebi (Kishinouye) in Goa estuaries

    Digital Repository Service at National Institute of Oceanography (India)

    Nair, S.R.S.; Achuthankutty, C.T.; Parulekar, A.H.

    study point it formed as much as 30.77% of the stake net fishery. Also, 35.1% of the males caught were with fully developed spermatophores. Interestingly, females in maturity stages 3 and 4 were caught from one estuary. Our data shows that this species...

  12. Tidal freshwater wetlands, the fresh dimension of the estuary

    NARCIS (Netherlands)

    Barendregt, A.

    2016-01-01

    Upstream in the estuary, where the river ends, the tidal energy is still present but the constant input from the river creates permanent fresh water conditions. The physical, chemical and biological conditions differ from the brackish part of the tidal area, but by processes from the tidal wave also

  13. Columbia Estuary Ecosystem Restoration Program. 2012 Synthesis Memorandum

    Science.gov (United States)

    2013-01-01

    1 CEERP is an acronym coined in 2011 for the joint BPA/Corps efforts to restore LCRE ecosystems that...Baross, and CA Simenstad. 1998. “Dominance of particle–attached bacteria in the Columbia River estuary, USA.” Aquatic Microbial Ecology 14:7-18. 9.4

  14. Estuaries May Face Increased Parasitism as Sea Levels Rise

    Science.gov (United States)

    Wendel, JoAnna

    2014-12-01

    Invertebrates in estuaries could be at a greater risk of parasitism as climate change causes sea levels to rise. A new paper published 8 December in Proceedings of the National Academy of Sciences of the United States of America (doi:10.1073/pnas.1416747111) describes how rapid sea level rise in the Holocene affected the population of parasitic flatworms called trematodes.

  15. Production and consumption of biological particles in temperate tidal estuaries

    NARCIS (Netherlands)

    Heip, C.H.R.; Goosen, N.K.; Herman, P.M.J.; Kromkamp, J.C.; Middelburg, J.J.; Soetaert, K.E.R.

    1995-01-01

    The question is reviewed whether a balance exists between production and consumption of biological particles in temperate tidal estuaries and what the relationships are between the magnitude of production and consumption processes and system carbon metabolism. The production terms considered are pri

  16. Moveable flood barriers in the Rhine-Meuse estuary

    NARCIS (Netherlands)

    Rijcken, T.; Kok, M.

    2011-01-01

    It is possible to reduce flood risk in estuaries without having to drastically modify the river banks by levees or to block shipping routes and ecological flows by dams. ‘Storm surge barriers’ close off a river mouth at times of high sea water levels, but keep the river open during calmer times. ‘Mo

  17. Organic carbon in the sediments of Mandovi estuary, Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Alagarsamy, R.

    Total organic carbon (TOC) in surficial sediments in Mandovi Estuary, Goa, India varies widely from 0.1 to 3% (av. 1.05%). Highest values of TOC (2.4-3%) lie close to the mouth region and indicate no definite trend in its variation in the estuarine...

  18. Reference Condition Approach for Numeric Nutrient Criteria for Oregon Estuaries

    Science.gov (United States)

    Development of nutrient criteria for all water body types of the US remains a top priority for EPA. Estuaries in the Pacific Northwest receive nutrients from both the watershed and the coastal ocean, and thus are particularly complex systems in which to establish water quality c...

  19. Monitoring acute and chronic water column toxicity in the Northern Sacramento-San Joaquin Estuary, California, USA, using the euryhaline amphipod, Hyalella azteca: 2006 to 2007.

    Science.gov (United States)

    Werner, Inge; Deanovic, Linda A; Markiewicz, Dan; Khamphanh, Manisay; Reece, Charles K; Stillway, Marie; Reece, Charissa

    2010-10-01

    After the significant population decline of several pelagic fish species in the Northern Sacramento-San Joaquin (SSJ) Estuary (CA, USA) in 2002, a study was performed to monitor water column toxicity using the amphipod Hyalella azteca. From January 1, 2006 to December 31, 2007, water samples were collected biweekly from 15 to 16 sites located in large delta channels and main-stem rivers, selected based on prevalent distribution patterns of fish species of concern. Ten-day laboratory tests with H. azteca survival and relative growth as toxicity endpoints were conducted. The enzyme inhibitor piperonyl butoxide ([PBO], 25 µg/L) was added to synergize or antagonize pyrethroid or organophosphate (OP) insecticide toxicity, respectively. Significant amphipod mortality was observed in 5.6% of ambient samples. Addition of PBO significantly changed survival or growth in 1.1% and 10.1% of ambient samples, respectively. Sites in the Lower Sacramento River had the largest number of acutely toxic samples, high occurrence of PBO effects on amphipod growth (along with sites in the South Delta), and the highest total ammonia/ammonium concentrations (0.28 ± 0.15 mg/L). Ammonia/ammonium, or contaminants occurring in mixture with these, likely contributed to the observed toxicity. Pyrethroid insecticides were detected at potentially toxic concentrations. Overall, results of this study identified specific areas and contaminants of concern and showed that water in the Northern SSJ Estuary was at times acutely toxic to sensitive invertebrates.

  20. Climate variability in an estuary: Effects of riverflow on San Francisco Bay

    Science.gov (United States)

    Peterson, David H.; Cayan, Daniel R.; Festa, John F.; Nichols, Frederic H.; Walters, Roy A.; Slack, James V.; Hager, Stephen E.; Schemel, Laurence E.; Peterson, David H.

    1989-01-01

    A simple conceptual model of estuarine variability in the context of climate forcing has been formulated using up to 65 years of estimated mean-monthly delta flow, the cumulative freshwater flow to San Francisco Bay from the Sacramento-San Joaquin River, and salinity observations near the mouth, head, mid-estuary, and coastal ocean. Variations in delta flow, the principal source of variability in the bay, originate from anomalous changes in northern and central California streamflow, much of which is linked to anomalous winter sea level pressure (“CPA”) in the eastern Pacific. In years when CPA is strongly negative, precipitation in the watershed is heavy, delta flow is high, and the bay's salinity is low; similarly, when CPA is strongly positive, precipitation is light, delta flow is low, and the bay's salinity is high. Thus the pattern of temporal variability in atmospheric pressure anomalies is reflected in the streamflow, then in delta flow, then in estuarine variability. Estuarine salinity can be characterized by river to ocean patterns in annual cycles of salinity in relation to delta flow. Salinity (total dissolved solids) data from the relatively pristine mountain streams of the Sierra Nevada show that for a given flow, one observes higher salinities during the rise in winter flow than on the decline. Salinity at locations throughout San Francisco Bay estuary are also higher during the rise in winter flow than the decline (because it takes a finite time for salinity to fully respond to changes in freshwater flow). In the coastal ocean, however, the annual pattern of sea surface salinity is reversed: lower salinities during the rise in winter flow than on the decline due to effects associated with spring upwelling. Delta flow in spring masks these effects of coastal upwelling on estuarine salinity, including near the mouth of the estuary and, in fact, explains in a statistical sense 86 percent of the variance in salinity at the mouth of the estuary. Some

  1. Thallium dynamics in the Weser estuary (NW Germany)

    Science.gov (United States)

    Böning, Philipp; Ehlert, Claudia; Niggemann, Jutta; Schnetger, Bernhard; Pahnke, Katharina

    2017-03-01

    Despite its toxicity and versatile geochemistry, not much is known on the distribution, speciation and behaviour of Thallium (Tl) in the marine coastal environment, notably in estuaries. We here contribute to the discussion by presenting dissolved (data of Tl, Fe, Mn, as well as dissolved organic carbon (DOC) and dissolved Si for two transects through the Weser estuary during summer (July 2013) and winter (early March 2014). The results show that both, dissolved Tl (70-130 pM) and DOC (100-1000 μM) are elevated against average river concentrations, show the same distinct seasonality, decrease with increasing salinity and positively deviate from conservative mixing. Compared to that, dissolved Si displays almost conservative mixing with seawater while dissolved Fe and Mn are quickly removed in the estuarine turbidity maximum (ETM) classically located in the low salinity region of the estuary. The data further suggest that both, dissolved Tl and DOC exhibit only little loss at the ETM, and that Tl does not seem to cycle with Fe and Mn as was suggested for other estuaries. Moreover, reactive particulate Tl (as calculated from excess Tl enriched versus the lithogenic background) on the particles amount to only 20-50% of the dissolved Tl concentrations. This is in agreement with earlier studies underlining the low particle reactivity of Tl. However, the strong correlation between dissolved Tl and DOC is new and suggests a combined cycling through the estuary. Albeit being indirect, our observations support earlier suggestions of a possible association of Tl with organic ligands, and that Tl tends to remain in the dissolved phase when entering the ocean.

  2. Biogeochemistry of the Kem' River estuary, White Sea (Russia

    Directory of Open Access Journals (Sweden)

    V. R. Shevchenko

    2005-01-01

    Full Text Available The biogeochemistry of the river-sea interface was studied in the Kem' River (the largest river flowing to the White Sea from Karelian coast estuary and adjacent area of the White Sea onboard the RV 'Ekolog' in summer 2001, 2002 and 2003. The study area can be divided into 3 zones: I - the estuary itself, with water depth from 1 to 5m and low salinity in the surface layer (salinity is lower than 0.2psu in the Kem' River and varies from 15 to 20psu in outer part of this zone; II - the intermediate zone with depths from 5 to 10m and salinity at the surface from 16 to 22psu; III - the marine zone with depths from 10 to 29 m and salinity 21-24.5psu. Highest concentrations of the suspended particulate matter (SPM were registered in the Kem' mouth (5-7mg/l. They sharply decreased to values org to nitrogen (N ratio (Corg/N in both suspended matter and bottom sediments decreases from the river to the marine part of the mixing zone (from 8.5 to 6.1 in the suspended matter and from 14.6 to 7.5 in the bottom sediments, demonstrating that content of terrestrial-derived organic matter decreases and content of marine organic matter increases from the river mouth to the sea. The Kem' estuary exhibits a similar character of biogeochemial processes as in the large Arctic estuaries, but the scale of these processes (amount of river input of SPM, POC, area of estuaries is different.

  3. Gross Nitrogen Mineralization in Surface Sediments of the Yangtze Estuary.

    Science.gov (United States)

    Lin, Xianbiao; Hou, Lijun; Liu, Min; Li, Xiaofei; Yin, Guoyu; Zheng, Yanling; Deng, Fengyu

    2016-01-01

    Nitrogen mineralization is a key biogeochemical process transforming organic nitrogen to inorganic nitrogen in estuarine and coastal sediments. Although sedimentary nitrogen mineralization is an important internal driver for aquatic eutrophication, few studies have investigated sedimentary nitrogen mineralization in these environments. Sediment-slurry incubation experiments combined with 15N isotope dilution technique were conducted to quantify the potential rates of nitrogen mineralization in surface sediments of the Yangtze Estuary. The gross nitrogen mineralization (GNM) rates ranged from 0.02 to 5.13 mg N kg(-1) d(-1) in surface sediments of the study area. The GNM rates were generally higher in summer than in winter, and the relative high rates were detected mainly at sites near the north branch and frontal edge of this estuary. The spatial and temporal distributions of GNM rates were observed to depend largely on temperature, salinity, sedimentary organic carbon and nitrogen contents, and extracellular enzyme (urease and L-glutaminase) activities. The total mineralized nitrogen in the sediments of the Yangtze Estuary was estimated to be about 6.17 × 10(5) t N yr(-1), and approximately 37% of it was retained in the estuary. Assuming the retained mineralized nitrogen is totally released from the sediments into the water column, which contributed 12-15% of total dissolved inorganic nitrogen (DIN) sources in this study area. This result indicated that the mineralization process is a significant internal nitrogen source for the overlying water of the Yangtze Estuary, and thus may contribute to the estuarine and coastal eutrophication.

  4. Gross Nitrogen Mineralization in Surface Sediments of the Yangtze Estuary.

    Directory of Open Access Journals (Sweden)

    Xianbiao Lin

    Full Text Available Nitrogen mineralization is a key biogeochemical process transforming organic nitrogen to inorganic nitrogen in estuarine and coastal sediments. Although sedimentary nitrogen mineralization is an important internal driver for aquatic eutrophication, few studies have investigated sedimentary nitrogen mineralization in these environments. Sediment-slurry incubation experiments combined with 15N isotope dilution technique were conducted to quantify the potential rates of nitrogen mineralization in surface sediments of the Yangtze Estuary. The gross nitrogen mineralization (GNM rates ranged from 0.02 to 5.13 mg N kg(-1 d(-1 in surface sediments of the study area. The GNM rates were generally higher in summer than in winter, and the relative high rates were detected mainly at sites near the north branch and frontal edge of this estuary. The spatial and temporal distributions of GNM rates were observed to depend largely on temperature, salinity, sedimentary organic carbon and nitrogen contents, and extracellular enzyme (urease and L-glutaminase activities. The total mineralized nitrogen in the sediments of the Yangtze Estuary was estimated to be about 6.17 × 10(5 t N yr(-1, and approximately 37% of it was retained in the estuary. Assuming the retained mineralized nitrogen is totally released from the sediments into the water column, which contributed 12-15% of total dissolved inorganic nitrogen (DIN sources in this study area. This result indicated that the mineralization process is a significant internal nitrogen source for the overlying water of the Yangtze Estuary, and thus may contribute to the estuarine and coastal eutrophication.

  5. Holocene estuary development in the Algarve Region (Southern Portugal)

    Science.gov (United States)

    Schneider, Heike; Höfer, Dana; Trog, Carmen; Hempel, Rita; Daut, Gerhard; Mäusbacher, Roland

    2010-05-01

    Former coastal estuaries in the Algarve region of South Portugal are used for reconstruction coastal evolution since first marine transgression processes at about 8.000 years before. The sediments of these archives allow high resolution analyses of geochemical and palynological signals. Drillings in different lagoons of the Algarve region contain the sequences from the fluvial sediments during the early Holocene, marine transgression facies during the middle Holocene and the marine/fluvial sediment deposits until present. The results of the sedimentological, geochemical and palynological analyses show that each estuary developed differently, depending on the morphology of the paleovalley, environmental conditions and especially the influence of the sea and the formation of barrier systems. The estuaries were flooded between 7500 and 5500 cal a BP by sea level rise and were almost completely filled by sediment by the beginning of the Roman occupation (226 y BC / 2176 cal a BP). A clear change in sedimentological processes is evident in the estuaries between 5500 and 3000 cal a BP and is interpreted as a result of high energy events such as storms or tsunamis (Schneider et al. 2009, Hilbich et al. 2008 ). Palynological as well as archaeological investigations show distinct anthropogenic influences since 3500 cal. BP by increasing values in maquies, cereals and open land communities. References Hilbich, C., Mügler, I., Daut, G., Frenzel, P., van der Borg, K., Mäusbacher, R. (2008): Reconstruction of the depositional history of the former coastal lagoon of Vilamoura (Algarve, Portugal): A sedimentological, microfaunal and geophysical approach.- Journal of Coastal Research 24(2B), 83-91. Schneider, H., Höfer, D., Trog, C., Busch, S., Schneider, M., Baade, J., Daut, G. & R. Mäusbacher (2009): Holocene estuary development in the Algarve Region (Southern Portugal) - A reconstruction of sedimentological and ecological evolution. - Quaternary International (In Press

  6. LA LARGA MARCHA DE LA ACCIÓN AMBIENTAL EN LOS CENTROS EDUCATIVOS. UN ESTUDIO DE CASO EN ARAGÓN

    Directory of Open Access Journals (Sweden)

    Carmelo Marcén Albero

    2012-01-01

    Full Text Available La ambientalización curricular de los centros educativos es una tarea compleja. Se apoya en el crecienteinterés por las cuestiones ambientales pero tiene un difícil encaje en la metodología presente, muypreocupada por los contenidos. Aún así, es posible porque existe una cierta práctica profesional para trabajar determinadas cuestiones ambientales. Programar investigaciones para reconocer los rasgos de las actuaciones ambientalizadores presentes es un buen camino para construir a partir de ellas proyectos con nuevas dimensiones. Estas necesitan conocer los contenidos clave en la dinámica ambiental, diseñar los contextos de la intervención y concertar los procesos que se deberían recorrer para lograr una verdadera ambientalización. Ese es el camino que se recorrió en la investigación que aquí se presenta.

  7. Fitorremediación, una tecnología que involucra a plantas y microorganismos en el saneamiento ambiental

    Directory of Open Access Journals (Sweden)

    Jeannette Marrero-Coto

    2012-01-01

    Full Text Available Uno de los rasgos distintivos de la sociedad moderna es la creciente generación de contaminantes ambientales, lo que trae consigo daños considerables a la salud humana y a la diversidad biológica. Los metales pesados son contaminantes que necesitan especial atención porque pueden permanecer varias décadas en el suelo y concentrarse en las cadenas tróficas. Las tecnologías desarrolladas para el saneamiento de ambientes contaminados con metales pesados son costosas y requieren un largo período de tiempo para su ejecución. La fitorremediación es una vertiente de la biorremediación que surge recientemente como alternativa ante esta problemática ambiental, y se basa en el uso de plantas que acumulan elevadas concentraciones de metales en sus tejidos para contener, remover o neutralizar contaminantes, mediante mecanismos de captura de metales propios de estas plantas y/o por los microorganismos que se desarrollan en la rizosfera. Estudios previos sugieren que los microorganismos rizosféricos poseen mecanismos capaces de alterar la circulación de metales en el medio ambiente, con efectos subsecuentes en el potencial de la planta para su captación en la raíz. En la actualidad, la fitorremediación no es una tecnología disponible comercialmente. Los progresos en el campo son limitados por falta de conocimiento de las interacciones complejas en la rizosfera y los mecanismos de plantas hiperacumuladoras que permiten la translocación del metal y su acumulación. Esta revisión responde a la necesidad de brindar mayores conocimientos que aumenten la rentabilidad y eficacia de estas plantas, debido a que su aplicación resulta muy importante en la protección del medio ambiente.

  8. Three-dimensional semi-idealized model for tidal motion in tidal estuaries: an application to the Ems estuary

    NARCIS (Netherlands)

    Kumar, Mohit; Schuttelaars, H.M.; Roos, P.C.; Möller, M.

    2016-01-01

    In this paper, a three-dimensional semi-idealized model for tidal motion in a tidal estuary of arbitrary shape and bathymetry is presented. This model aims at bridging the gap between idealized and complex models. The vertical profiles of the velocities are obtained analytically in terms of the firs

  9. Relación de aptitudes musicales, intelectuales y rasgos de personalidad e identificación del talento musical en escolares de diez a doce años

    OpenAIRE

    Lázaro Tortosa, Francisco Rafael

    2015-01-01

    La presente investigación surge de las reflexiones como docente de Educación Primaria sobre la calidad del desarrollo en el aula de las capacidades musicales, intelectuales, rasgos de personalidad en los escolares y sobre la jerarquización de las áreas contempladas en nuestro sistema educativo que no se corresponde con la pretendida “educación integral”. La fundamentación teórica comprende tres capítulos (aptitudes intelectuales, aptitudes musicales y personalidad) organizados bajo el mism...

  10. Estudio de la relación entre la variabilidad anatómica regional del cerebro medida con RM 3-D y los estilos cognitivos y rasgos de la personalidad

    OpenAIRE

    López Sala, Anna

    2011-01-01

    El proceso de hominización probablemente ha implicado una serie de cambios morfológicos cerebrales. El grado de desarrollo anatómico de regiones cerebrales funcionalmente relevantes, caracterizadas por su gran variabilidad interindividual y por la existencia de una marcada asimetría hemisférica, podría estar relacionado con las diferencias individuales en los estilos cognitivos y rasgos de la personalidad. Hay numerosos estudios que exponen las diferentes asimetrías morfológicas hemisféricas ...

  11. Descripción del rendimiento cognitivo y rasgos de personalidad de pacientes con fibromialgia: relación del rendimiento cognitivo con la percepción de dolor, sintomatología depresiva e impacto de la enfermedad.

    OpenAIRE

    2009-01-01

    La fibromialgia (FM) es una enfermedad de etiología desconocida, que se caracteriza por la presencia de dolor musculoesquelético difuso crónico de más de tres meses de evolución, acompañado generalmente de fatiga, rigidez de intensidad variable y un amplio rango de otros síntomas. Con frecuencia los pacientes con FM suelen referir, quejas sobre su rendimiento cognitivo, manifestando principalmetne dificultad para concentrarse y pérdida de memoria. Con la intención de conocer los rasgos de ...

  12. Eelgrass Enhancement and Restoration in the Lower Columbia River Estuary, Period of Performance: Feb 2008-Sep 2009.

    Energy Technology Data Exchange (ETDEWEB)

    Judd, C.; Thom, R; Borde, A. [Pacific Northwest National Laboratory

    2009-09-08

    The purpose of this study was to evaluate the ability to enhance distribution of eelgrass (Zostera marina) in the Columbia River Estuary to serve as refuge and feeding habitat for juvenile salmon, Dungeness crab, and other fish and wildlife. We strongly suspected that limited eelgrass seed dispersal has resulted in the present distribution of eelgrass meadows, and that there are other suitable places for eelgrass to survive and form functional meadows. Funded as part of the Bonneville Power Administration's call for Innovative Projects, we initiated a multistage study in 2008 that combined modeling, remote sensing, and field experimentation to: (1) Spatially predict habitat quality for eelgrass; (2) Conduct experimental plantings; and (3) Evaluate restoration potential. Baseline in-situ measurements and remote satellite observations were acquired for locations in the Lower Columbia River Estuary (LCRE) to determine ambient habitat conditions. These were used to create a habitat site-selection model, using data on salinity, temperature, current velocity, light availability, wave energy, and desiccation to predict the suitability of nearshore areas for eelgrass. Based on this model and observations in the field, five sites that contained no eelgrass but appeared to have suitable environmental conditions were transplanted with eelgrass in June 2008 to test the appropriateness of these sites for eelgrass growth. We returned one year after the initial planting to monitor the success rate of the transplants. During the year after transplanting, we carried out a concurrent study on crab distribution inside and outside eelgrass meadows to study crab usage of the habitat. One year after the initial transplant, two sites, one in Baker Bay and one in Young's Bay, had good survival or expansion rates with healthy eelgrass. Two sites had poor survival rates, and one site had a total loss of the transplanted eelgrass. For submerged aquatic vegetation (SAV) restoration

  13. Hacia un constructivismo realista: de la naturaleza al medio ambiente

    Directory of Open Access Journals (Sweden)

    Arias Maldonado, Manuel

    2011-06-01

    Full Text Available The relationship between society and nature has an outstanding importance in the fields of environmental philosophy and sociology. It is dominated by the opposition between realism and constructivism, i.e.: between those who argue that nature is an entity independent of society and those who respond that nature is a social construction. Such conflict is usually solved accepting that nature exists but our knowledge of it can only be socially mediated. However, a new version of constructivism is to be defended, one which pays enough attention to the material dimension of society-nature’s interaction. Society has always intervened upon nature and the final outcome of such historical process is but the transformation of nature into human environment. A realistic constructivism allows us to highlight that decisive feature of socio-natural interaction.

    Si hay un campo en el que tiene importancia el debate acerca de la relación de la sociedad con la naturaleza, es la filosofía y sociología medioambientales. Es un debate dominado por el enfrentamiento entre realismo y constructivismo: entre quienes sostienen que la naturaleza es una entidad independiente de la sociedad y quienes alegan que la naturaleza es una construcción social. Es habitual que esta querella se resuelva mediante la afirmación de que la naturaleza existe, pero sólo la conocemos mediadamente. Sin embargo, es hora de defender una versión del constructivismo que preste la debida atención a la dimensión material de la relación socionatural. La sociedad nunca ha dejado de intervenir en la naturaleza y el resultado final de ese proceso histórico es, de hecho, la transformación de la sociedad en medio ambiente humano. Sólo un constructivismo realista permite poner de manifiesto este rasgo decisivo de la interacción socionatural.

  14. Historical Ambient Air Quality Data Inventory

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Historical Ambient Air Quality Data Inventory contains measured and estimated data on ambient air pollution for use in assessing air quality, assisting in...

  15. Circulation and suspended particulate matter transport in a tidally dominated estuary: caravelas estuary, Bahia, Brazil

    Directory of Open Access Journals (Sweden)

    Carlos Augusto França Schettini

    2010-03-01

    Full Text Available The circulation and transport of suspended particulate matter in the Caravelas Estuary are assessed. Nearly-synoptic hourly hydrographic, current (ADCP velocity and volume transport and suspended particulate matter data were collected during a full semidiurnal spring tide, on the two transects Boca do Tomba and Barra Velha and on longitudinal sections at low and high tide. On the first transect the peak ebb currents (-1.5 ms-1 were almost twice as strong as those of the wider and shallow Barra Velha inlet (-0.80 ms-1 and the peak flood currents were 0.75 and 0.60 ms-1, respectively. Due to the strong tidal currents both inlets had weak vertical salinity stratification and were classified with the Stratification-circulation Diagram as Type 2a (partially mixed-weakly stratified and Type 1a (well mixed. Volume transports were very close, ranging from -3,500 to 3,100 m³s-1 at the ebb and flood, respectively, with a residual -630 m³s-1. The concentration of the suspended particulate matter was closely related to the tidal variation and decreased landwards from 50 mg.L-1 at the estuary mouth, to 10 mg.L-1 at distances of 9 and 16 km for the low and high tide experiments, respectively. The total residual SPM transport was out of the estuary at rates of -18 tons per tidal cycle.A circulação e o transporte de material particulado em suspensão no Estuário de Caravelas são pesquisados. Dados quase-sinóticos hidrográficos, de correntes (velocidade e transporte de volume com ADCP e de material particulado em suspensão, foram medidos em intervalos horários durante um ciclo semidiurno de maré de sizígia, em duas seções transversais na Boca do Tomba e na Barra Velha e também em seções longitudinais na baixa-mar e na preamar. Na primeira transversal as correntes máximas de vazante (-1,50 m s-1 foram quase duas vezes mais intensas do que na seção transversal mais larga e rasa Barra Velha, (-0,80 m s-1 e as maiores velocidades das correntes de

  16. GESTIÓN AMBIENTAL METROPOLITANA

    OpenAIRE

    Déctor García, Mtro. Romeo; Correctora de estilo

    2014-01-01

    El artículo aborda la gestión ambiental y metropolitana, a partir de los elementos que han expuesto autores como Raúl Brañes, María del Carmen Carmona Lara, o Martha Schteingart y Clara Eugenia Salazar y otros más que abordan el tema urbano. Se profundiza y detalla con base en la legislación de equilibrio ecológico y protección al ambiente, en la legislación sobre biodiversidad mexiquense como en la atinente a la administración pública local o municipal.Puntos de relieve son las menciones de ...

  17. Tipologia para a contabilidade ambiental

    Directory of Open Access Journals (Sweden)

    Nazlhe Faride Chein Schekaiban

    2007-06-01

    Full Text Available Este artigo revê a visão, as propostas e o desenvolvimento da contabilidade ambiental, refletindo sobre suas implicações, com a finalidade de descobrir e encontrar sua importância e situação. Para se chegar a esse resultado foi preciso realizar uma revisão epistemológica moldada e processo reflexivo de sustentabilidade e da aproximação ao usuário, da percepção da realidade contábil no México e da gerência interna das organizações. As conclusões mostram a contabilidade ambiental no México fora da re-alidade operativa do modelo contábil regional, aumentando a importância de se criar uma cultura capaz de examinar o controle da missão deste tipo de contabilidade.

  18. Ambient Art: Creative Information Representation

    Directory of Open Access Journals (Sweden)

    Russell Beale

    2007-01-01

    Full Text Available Ambient art is the aesthetic presentation of information, using artistic techniques to achieve a pleasing image that also contains hidden depths, where exposure to it over time allows a viewer to understand something about the information sources that it represents. This paper reviews the artistic and computational background of ambient systems, and presents two case studies of systems developed by our research team, from their initial design to the experiences of the people encountering them. The first case presents a photo mosaic of images based on the news headlines coupled with a structured picture based on the weather; the second presents stylistic perspectives on activity in a public space. Both are evaluated and demonstrate that different forms of aesthetically pleasing displays can convey information to viewers.

  19. Structural lubricity under ambient conditions

    Science.gov (United States)

    Cihan, Ebru; Ipek, Semran; Durgun, Engin; Baykara, Mehmet Z.

    2016-06-01

    Despite its fundamental importance, physical mechanisms that govern friction are poorly understood. While a state of ultra-low friction, termed structural lubricity, is expected for any clean, atomically flat interface consisting of two different materials with incommensurate structures, some associated predictions could only be quantitatively confirmed under ultra-high vacuum (UHV) conditions so far. Here, we report structurally lubric sliding under ambient conditions at mesoscopic (~4,000-130,000 nm2) interfaces formed by gold islands on graphite. Ab initio calculations reveal that the gold-graphite interface is expected to remain largely free from contaminant molecules, leading to structurally lubric sliding. The experiments reported here demonstrate the potential for practical lubrication schemes for micro- and nano-electromechanical systems, which would mainly rely on an atomic-scale structural mismatch between the slider and substrate components, via the utilization of material systems featuring clean, atomically flat interfaces under ambient conditions.

  20. Fiscalidad ambiental (curso 2011-2012)

    OpenAIRE

    Gil Maciá, Lorenzo

    2012-01-01

    Tema fiscalidad ambiental. 1. Necesidad económica y jurídica de la protección del medio ambiente. 2. Características, naturaleza y clasificación de los tributos ambientales. 3. Competencias tributarias en el ámbito estatal, autonómico y local. 4. La fiscalidad ambiental en la legislación fiscal española. 5. Perspectivas de futuro en materia de imposición ambiental.

  1. Measuring the contribution of benthic ecosystem engineering species to the ecosystem services of an estuary: A case study of burrowing shrimps in Yaquina Estuary, Oregon - April 2009

    Science.gov (United States)

    Burrowing shrimps are regarded as ecosystem engineering species in many coastal ecosystems worldwide, including numerous estuaries of the west coast of North America (Baja California to British Columbia). In estuaries of the U.S. Pacific Northwest, two species of large burrowing...

  2. Measuring the contribution of benthic ecosystem engineering species to the ecosystem services of an estuary: A case study of burrowing shrimps in Yaquina Estuary, Oregon

    Science.gov (United States)

    Burrowing shrimps are regarded as ecosystem engineering species in many coastal ecosystems worldwide, including numerous estuaries of the west coast of North America (Baja California to British Columbia). In estuaries of the U.S. Pacific Northwest, two species of large burrowing...

  3. Ambiente psicologico en las organizaciones

    OpenAIRE

    2002-01-01

    El talento humano en las organizaciones se ha convertido en las ultimas decadas en un recurso que se administra de acuerdo al estilo de liderazgo del jefe, lo que implica una marcada relación hacia la tarea, hacia las relaciones con el personal o una combinación de estas dos, que desencadenan en un ambiente psicológico exclusive en cada organización.

  4. Ambiente psicologico en las organizaciones

    Directory of Open Access Journals (Sweden)

    Damarcy Cortés Baracaldo

    2002-01-01

    Full Text Available El talento humano en las organizaciones se ha convertido en las ultimas decadas en un recurso que se administra de acuerdo al estilo de liderazgo del jefe, lo que implica una marcada relación hacia la tarea, hacia las relaciones con el personal o una combinación de estas dos, que desencadenan en un ambiente psicológico exclusive en cada organización.

  5. Estrategia para la sustentabilidad ambiental

    Directory of Open Access Journals (Sweden)

    Cecilia Erbiti

    2006-01-01

    Full Text Available En el contexto de los postulados conceptuales y metodológicos de la planificación estratégica y de sustentabilidad ambiental, el objetivo de esta investigación es describir el proceso de formulación del Plan de Ordenamiento Territorial del Municipio de Tandil (POTM y analizar su potencialidad para avanzar hacia la sustentabilidad ambiental del sistema. Los resultados de la misma muestran que el POTM no sólo prioriza principios, objetivos y estrategias que materializan las diferentes manifestaciones de la sustentabilidad (económica, social, ecológica y política, sino que la totalidad del Plan se fundamenta en el concepto de desarrollo sostenible y, con ello, se establecen prioridades de actuación que posibilitarán la gestión ambiental urbana. Si bien el POTM muestra una gran potencialidad para avanzar hacia la sustentabilidad del territorio, la implementación y cumplimiento del mismo constituye un fuerte desafío para las autoridades de aplicación.

  6. 40 CFR 1033.505 - Ambient conditions.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 32 2010-07-01 2010-07-01 false Ambient conditions. 1033.505 Section 1033.505 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR POLLUTION CONTROLS... presumed that combustion air will be drawn from the ambient air. Thus, the ambient temperature limits...

  7. The causal order on the ambient boundary

    CERN Document Server

    Antoniadis, Ignatios; Papadopoulos, Kyriakos

    2016-01-01

    We analyse the causal structure of the ambient boundary, the conformal infinity of the ambient (Poincar\\'e) metric. Using topological tools we show that the only causal relation compatible with the global topology of the boundary spacetime is the horismos order. This has important consequences for the notion of time in the conformal geometry of the ambient boundary.

  8. Research, Monitoring, and Evaluation for the Federal Columbia River Estuary Program.

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Diefenderfer, Heida L. (Pacific Northwest National Laboratory)

    2008-02-20

    The purpose of this document is to describe research, monitoring, and evaluation (RME) for the Federal Columbia River Estuary Program, hereafter called 'the Estuary Program'. The intent of this RME effort is to provide data and information to evaluate progress toward meeting program goals and objectives and support decision making in the Estuary Program. The goal of the Estuary Program is to understand, conserve, and restore the estuary ecosystem to improve the performance of listed salmonid populations. The Estuary Program has five general objectives, designed to fulfill the program goal, as follows: (1) Understand the primary stressors affecting ecosystem controlling factors, such as ocean conditions and invasive species. (2) Conserve and restore factors controlling ecosystem structures and processes, such as hydrodynamics and water quality. (3) Increase the quantity and quality of ecosystem structures, i.e., habitats, juvenile salmonids use during migration through the estuary. (4) Maintain the food web to benefit salmonid performance. (5) Improve salmonid performance in terms of life history diversity, foraging success, growth, and survival. The goal of estuary RME is to provide pertinent and timely research and monitoring information to planners, implementers, and managers of the Estuary Program. The goal leads to three primary management questions pertaining to the main focus of the Estuary Program: estuary habitat conservation and restoration. (1) Are the estuary habitat actions achieving the expected biological and environmental performance targets? (2) Are the offsite habitat actions in the estuary improving juvenile salmonid performance and which actions are most effective at addressing the limiting factors preventing achievement of habitat, fish, or wildlife performance objectives? (3) What are the limiting factors or threats in the estuary/ocean preventing the achievement of desired habitat or fish performance objectives? Performance measures

  9. How hydrodynamics control algal blooms in the Ythan estuary, Scotland

    Science.gov (United States)

    Champangern, Khruewan; Hoey, Trevor; Thomas, Rhian

    2016-04-01

    The Ythan estuary, northeast Scotland, was designated in 2000 as a Nitrate Vulnerable Zone (NVZ) under the European Commission (EC) Nitrates Directive. Much of the catchment is intensively farmed and water quality has been adversely affected by nutrients from agricultural fertilizers. As a result, algal mats develop annually on tidal flats where sediment from upstream and from the adjacent dune systems is deposited. Understanding the patterns of water (river and ocean) circulation in the estuary as well as understanding how nutrients and sediments are transported in the estuary is crucial for understanding the role of several factors (elevation; sediment characteristics; nutrient flux) control the locations and scale of annual algal blooms. In order to understand those controls, study of interactions between hydrodynamic factors and water quality, in particular chlorophyll levels, at different time scales has been carried out. The results from the study reveal complex seasonal and event-scale relationships of river flow with the amount of chlorophyll, which provide an initial comprehension of controls over the concentrations of chlorophyll in the estuary. The concentration of chlorophyll changes, whether increasing or decreasing, with regards to changes in river flow. During high flow events, high amounts of chlorophyll are found when the tide is low. During low flow events, high amounts of chlorophyll are found at high tides. These phenomena reveal that both river flow and tidal cycle affect the amount of chlorophyll in the estuary. In addition, the Delft3d flow model, which has been extensively applied to many coastal and estuarine studies is used to simulate hydrodynamic patterns in the estuary during high flow and low flow events. The model is composed of 36,450 fine resolution grids and the upstream/ downstream boundary that represents water level is based on time-series data from river flow and tidal measurements. The bathymetry used for the model domain is

  10. A Multi-disciplinary Study of Frontal Systems in the Tay Estuary, Scotland

    Science.gov (United States)

    Ferrier, G.; Anderson, J. M.

    1997-09-01

    The results of a remote sensing study of tidal mixing processes in the Tay Estuary have been correlated with the results of mathematical and physical models and ground sampling data in an attempt to assess the nature, the spatial and temporal extent and the variability in the formation of convergent fronts in the Tay Estuary. The application of remote sensing methods to the study of estuarine mixing processes in the Tay Estuary, supported by ground measurements, has discovered convergent front mechanisms and complex hydrodynamic processes which had not previously been recognized in the Tay Estuary. This integrated approach has enabled the various features and mixing mechanisms found in the lower section of the estuary to be interrelated. The limitations of using a two-dimensional mathematical and a physical model to predict the complex mixing processes affecting water quality in the Tay Estuary are discussed.

  11. Groundwater-dependent ecology of the shoreline of the subtropical Lake St Lucia estuary

    Science.gov (United States)

    Taylor, Ricky; Kelbe, Bruce; Haldorsen, Sylvi; Botha, Greg A.; Wejden, Bente; Været, Lars; Simonsen, Marianne B.

    2006-02-01

    The ecology of the St Lucia estuary in South Africa is of unique international importance. During droughts the estuary experiences high salinities, with values above that of seawater. Ion-poor groundwater flowing into the estuary from prominent sand aquifers along its eastern shoreline forms low-salinity habitats for salt-sensitive biota. During droughts, plants and animals can take refuge in the groundwater discharge zone until the condition in the estuary regains tolerable salinity. Simulations of the groundwater discharge indicate that the flow can persist during droughts over at least a decade, and be of great important for the resilience of the estuary. Anthropogenic activities have reduced the river inflow and made the St Lucia estuary more sensitive to droughts. The groundwater has thereby become increasingly important for the estuary’s ecology. Protection of the groundwater discharge along the shoreline itself and actions to increase the groundwater recharge are therefore important management tasks.

  12. Plastic pollution in five urban estuaries of KwaZulu-Natal, South Africa.

    Science.gov (United States)

    Naidoo, Trishan; Glassom, David; Smit, Albertus J

    2015-12-15

    Monitoring plastic concentrations in estuaries is vital in assessing the magnitude of terrestrial inputs to oceanic environments. Data on plastics ≤ 5 mm in estuaries are scant. This study determined microplastic levels within five estuaries along the Durban coastline and on intervening beaches. Plastics were isolated from estuarine sediment, beach sediment and the surface water of each estuary and characterised. Sediment at the Bayhead area of Durban harbour had the highest average plastic concentrations (745.4 ± 129.7 particles per 500 ml) and an attenuating concentration trend away from the city centre was found. Prevailing south to north longshore drift was hypothesised to result in plastic accumulation on the northern shores of beaches with estuarine effluents, however, this was not found. Fragments composed the largest percent of plastics (59%) found in Bayhead, whereas fibres dominated other estuaries with proportions ranging from 38% of total plastics in the uMgeni estuary to 66% in the Mdloti.

  13. Functional diversity of fish communities in two tropical estuaries subjected to anthropogenic disturbance.

    Science.gov (United States)

    Dolbeth, M; Vendel, A L; Pessanha, A; Patrício, J

    2016-11-15

    The functional diversity of fish communities was studied along the salinity gradient of two estuaries in Northeast Brazil subjected to different anthropogenic pressures, to gain a better understanding of the response of fish communities to disturbance. We evaluated functional complementarity indices, redundancy and analysed functional composition through functional groups based on combinations of different traits. The fish communities in both estuaries share similar functions performed by few functional groups. The upstream areas had generally lower taxonomic, functional diversity and lower redundancy, suggesting greater vulnerability to impacts caused by human activities. Biomass was slightly more evenly distributed among functional groups in the less disturbed estuary, but total biomass and redundancy were lower in comparison to the urbanized estuary. The present findings lend strength to the notion that the less disturbed estuary may be more susceptible to anthropogenic impacts, underscoring the need for more effective conservation measures directed at this estuary.

  14. Dissolved organic carbon in the freshwater tidal reaches of the Schelde estuary

    DEFF Research Database (Denmark)

    Muylaert, K.; Dasseville, R.; De Brabandere, Loreto;

    2005-01-01

    catchment, our data suggest that the bulk of DOC in the freshwater tidal reaches is not derived from waste water. This was concluded from the low biodegradability of DOC (on average 9%), DOC concentrations that are close to the mean for European rivers (4.61 mg/l) and the absence of an inverse relationship...... between DOC and discharge. Most DOC originating from waste water being discharged in tributaries of the estuary appears to be remineralised before these tributaries reach the main estuary. Although dense phytoplankton blooms were observed in the upper estuary during summer (up to 700 mg chl a......To unravel the factors that regulate DOC dynamics in the freshwater tidal reaches of the Schelde estuary, DOC concentration and biodegradability were monitored in the upper Schelde estuary and its major tributaries. Although the Schelde estuary possesses a densely populated and industrialized...

  15. A comparative study on selected marine actinomycetes from Pulicat, Muttukadu, and Ennore estuaries

    Institute of Scientific and Technical Information of China (English)

    SChacko Vijai Sharma; Ernest David

    2012-01-01

    Objective: To isolate and make a comparative study of marine sediments actinomycetes from Pulicat estuary, Muttukadu estuary and Ennore estuary, TamilNadu, India. Methods: A unique selective enrichment procedure has resulted in the isolation and identification a total of 304 actinomycetes colonies which were isolated from different stations of marine soil sediments in Pulicat estuary, Muttukadu estuary and Ennore estuary, TamilNadu, India. Results: Among them, 277 isolates were morphologically distinct on the basis of spore mass colour, aerial and substrate mycelium formation and production of diffusible pigment. The majority (60%; 162 isolates) were assigned to the genus Streptomyces. (35%; 104 isolates) were assigned to the genus Actinopolyspora, (5%; 11 isolates) were assigned to the genus Nocardiodes. Conclusions: The present study concluded that the physiological characteristics of actinomycetes Streptomyces, Actinopolyspora and Nocardiodes varied by available nutrients in the medium and the physical conditions.

  16. Linking behavior, physiology, and survival of Atlantic Salmon smolts during estuary migration

    Science.gov (United States)

    Stich, Daniel S.; Zydlewski, Gayle B.; Kocik, John F.; Zydlewski, Joseph

    2015-01-01

    Decreased marine survival is identified as a component driver of continued declines of Atlantic Salmon Salmo salar. However, estimates of marine mortality often incorporate loss incurred during estuary migration that may be mechanistically distinct from factors affecting marine mortality. We examined movements and survival of 941 smolts (141 wild and 800 hatchery-reared fish) released in freshwater during passage through the Penobscot River estuary, Maine, from 2005 to 2013. We related trends in estuary arrival date, movement rate, and survival to fish characteristics, migratory history, and environmental conditions in the estuary. Fish that experienced the warmest thermal history arrived in the estuary 8 d earlier than those experiencing the coolest thermal history during development. Estuary arrival date was 10 d later for fish experiencing high flow than for fish experiencing low flow. Fish released furthest upstream arrived in the estuary 3 d later than those stocked further downstream but moved 0.5 km/h faster through the estuary. Temporally, movement rate and survival in the estuary both peaked in mid-May. Spatially, movement rate and survival both decreased from freshwater to the ocean. Wild smolts arrived in the estuary later than hatchery fish, but we observed no change in movement rate or survival attributable to rearing history. Fish with the highest gill Na+, K+-ATPase activity incurred 25% lower mortality through the estuary than fish with the lowest gill Na+, K+-ATPase activity. Smolt survival decreased (by up to 40%) with the increasing number of dams passed (ranging from two to nine) during freshwater migration. These results underscore the importance of physiological preparedness on performance and the delayed, indirect effects of dams on survival of Atlantic Salmon smolts during estuary migration, ultimately affecting marine survival estimates.

  17. Estimation of bed shear stresses in the pearl river estuary

    Science.gov (United States)

    Liu, Huan; Wu, Jia-xue

    2015-03-01

    Mean and fluctuating velocities were measured by use of a pulse coherent acoustic Doppler profiler (PC-ADP) and an acoustic Doppler velocimeter in the tidal bottom boundary layer of the Pearl River Estuary. The bed shear stresses were estimated by four different methods: log profile (LP), eddy correlation (EC), turbulent kinetic energy (TKE), and inertial dissipation (ID). The results show that (a) all four methods for estimating bed stresses have advantages and disadvantages, and they should be applied simultaneously to obtain reliable frictional velocity and to identify potential sources of errors; (b) the LP method was found to be the most suitable to estimate the bed stresses in non-stratified, quasi-steady, and homogeneous flows; and (c) in the estuary where the semi-diurnal tidal current is dominant, bed shear stresses exhibit a strong quarter-diurnal variation.

  18. Estimation of Bed Shear Stresses in the Pearl River Estuary

    Institute of Scientific and Technical Information of China (English)

    刘欢; 吴加学

    2015-01-01

    Mean and fluctuating velocities were measured by use of a pulse coherent acoustic Doppler profiler (PC-ADP) and an acoustic Doppler velocimeter in the tidal bottom boundary layer of the Pearl River Estuary. The bed shear stresses were estimated by four different methods: log profile (LP), eddy correlation (EC), turbulent kinetic energy (TKE), and inertial dissipation (ID). The results show that (a) all four methods for estimating bed stresses have advantages and disadvantages, and they should be applied simultaneously to obtain reliable frictional velocity and to identify potential sources of errors; (b) the LP method was found to be the most suitable to estimate the bed stresses in non-stratified, quasi-steady, and homogeneous flows; and (c) in the estuary where the semi-diurnal tidal current is dominant, bed shear stresses exhibit a strong quarter-diurnal variation.

  19. STUDY OF RED TIDE PREDICTION MODEL FOR THE CHANGJIANG ESTUARY

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    This paper based on field data (on red tide water quality monitoring at the Changjiang River mouth and Hutoudu mariculture area in Zhejiang Province from May to August in 1995, and May to September in 1996) presents an effective model for short term prediction of red tide in the Changjiang Estuary. The measured parameters include: depth, temperature, color diaphaneity, density, DO, COD and nutrients (PO4-P, NO2-N, NO3-N, NH4-N). The model was checked by field-test data, and compared with other related models.The model: Z=SAL-3.95 DO-2.974 PH-5.421 PO4-P is suitable for application to the Shengsi aquiculture area near the Changjiang Estuary.

  20. Estimation of dissolved inorganic nutrients fluxes from the Changjiang River into estuary

    Institute of Scientific and Technical Information of China (English)

    刘新成; 沈焕庭

    2001-01-01

    Because the estuary acts as either a trap or a source or both for nutrient elements and will modify greatly the riverine transport to the ocean, it is necessary to calculate the flux from river into estuary and that from estuary into sea, respectively. The present work aims to use a long-term record of nutrients concentrations and runoff discharges on H.e Datong section (625 km inland from the Changjiang River mouth) to identify the variability of nutrients concentrations and to estimate nutrients fluxes from the Changjiang River into the estuary.

  1. Effects of environmental stress on the condition of Littorina littorea along the Scheldt estuary (The Netherlands).

    Science.gov (United States)

    Van den Broeck, Heidi; De Wolf, Hans; Backeljau, Thierry; Blust, Ronny

    2007-04-15

    The condition of the periwinkle Littorina littorea, expressed in terms of its shell morphology, reproductive impairment (i.e. female sterility/intersex, male penis shedding), trematode infestation load, lipid reserves and dry/wet weight ratio, was determined in function of environmental stress along the polluted Western and relatively clean Eastern Scheldt estuary (The Netherlands). The upstream increasing pollution and decreasing salinity levels along the Western Scheldt estuary (Fig. 1) are reflected in the dry/wet weight ratio and lipid content of the periwinkles. Compared to the Eastern Scheldt, female intersex (i.e. indicator of TBT pollution) and sterility occurred more frequently in the Western Scheldt estuary, while male penis shedding was even restricted to the latter estuary. The highest population intersex and sterility incidence was found near the harbour of Vlissingen and reflects potential nautical activities. The number of trematode infested periwinkles did not differ between both estuaries, although local sampling site differences were detected within each estuary, reflecting the complex interactions that exist among parasites, hosts and the local environment. Finally, both estuaries were maximally discriminated from each other based on the shell weight of the periwinkles using a canonical discriminant analysis. Periwinkles with the heaviest shells were found in the Western Scheldt estuary and may reflect growth rate or structural population differences caused by the less favourable living conditions in the Western Scheldt estuary.

  2. Macrobenthic Community in the Xiaoqing River Estuary in Laizhou Bay, China

    Institute of Scientific and Technical Information of China (English)

    LUO Xianxiang; ZHANG Shanshan; YANG Jianqiang; PAN Jinfen; TIAN Lin; ZHANG Longjun

    2013-01-01

    The macrobenthic community of the Xiaoqing River Estuary and the adjacent sea waters was investigated in May and November 2008,August 2009,and May and September 2010,respectively.A total of 95 species of macrobenthos were identified in the five cruises and most of them were polychaetes (46.39%),mollusks (28.86%) and crustaceans (20.62%).The Shannon-Wiener index of macrobenthos was lower than 2 in 67% sites.Along the stream channel,estuary and the coastal waters,the species of polychaetes reduced gradually,while the abundance increased at first and then decreased.The abundance was the biggest at regions with salinity of 5-20 in the estuary.The species and abundance of mollusks and crustaceans increased gradually.As for seasonal distribution,the species,abundance and biomass were higher in spring and lower in summer and autumn.Contemporaneously compared with Laizhou Bay and Yellow River Estuary,the species of macrobenthos appeared in the Xiaoqing River Estuary were much less,while the percentage of polychaetes was higher.Abundance and biomass were higher in Xiaoqing River estuary,then consequently followed by Laizhou Bay and Yellow River Estuary.The dominant species in Xiaoqing River Estuary was polychaete,and Layzhou Bay mollusk.The community structure characteristics of macrobenthos in the Xiaoqing River Estuary revealed a significant pollution status in this region.

  3. Sedimentary framework of the Potomac River estuary, Maryland

    Science.gov (United States)

    Knebel, Harley J.; Martin, E. Ann; Glenn, J.L.; Needell, Sally W.

    1981-01-01

    Analyses of seismic-reflection profiles, sediment cores, grab samples, and side-scan sonar records, along with previously collected borehole data, reveal the characteristics, distribution, and geologic history of the shallow strata beneath the Potomac River estuary. The lowermost strata are sediments of the Chesapeake Group (lower Miocene to lower Pleistocene) that crop out on land near the shore but are buried as much as 40 m below the floor of the estuary. The top of these sediments is an erosional unconformity that outlines the Wisconsinan valley of the Potomac River. This valley has a sinuous trend, a flat bottom, a relief of 15 to 34 m, and axial depths of 34 to 54 m below present sea level. During the Holocene transgression of sea level, the ancestral valley was filled with as much as 40 m of sandy and silty, fluvial-to-shallow estuarine sediments. The fill became the substrate for oyster bars in the upper reach and now forms most marginal slopes of the estuary. Since sea level approached its present position (2,000 to 3,000 yr ago), the main channel has become the locus of deposition for watery, gray to black clay or silty clay, and waves and currents have eroded the heterogeneous Quaternary sediments along the margins, leaving winnowed brown sand on shallow shoreline flats. Pb-210 analyses indicate that modern mud is accumulating at rates ranging from 0.16 to 1.80 cm/yr, being lowest near the mouth and increasing toward the head of the estuary. This trend reflects an increased accumulation of fine-grained fluvial sediments near the turbidity maximum, similar to that found in nearby Chesapeake Bay. The present annual accumulation of mud is about 1.54 million metric tons; the cumulative mass is 406 million metric tons.

  4. Distribution of tributyltin (TBT) in the Mandovi estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Bhosle, N.B.

    ESTUARY 107 Figure 10.2 Distribution and fate of TBT compounds in aquatic environment (modified from Hoch 2001). environmental benefits such as reduced production of greenhouse gases and sup- pression of bioinvasion of biofouling organisms. Nevertheless... in benefits to marine farms. These measures were instrumental in decreasing levels of TBT in water, sedi- ment, and organisms (Hoch 2000). In Great Britain, water quality improved enough to permit resumption of oyster farming (Alzieu 2006). Decrease in TBT...

  5. Ambiente Familiar e Desempenho Escolar

    OpenAIRE

    2015-01-01

    O desempenho escolar é um fenómeno multifacetado, que pode ser influenciado por questões individuais, familiares e sociais, fazendo-se necessária a realização de pesquisas que procurem compreender esses aspectos e como eles se inter-relacionam. Nesse sentido, a presente dissertação abordará, especificamente, a relação entre as dimensões do ambiente familiar (coesão familiar, conflito, expressividade, independência, assertividade, interesses culturais/intelectuais e de lazer, religião e nível ...

  6. Estados financieros y medio ambiente

    OpenAIRE

    Bischhoffshausen W., Werner von

    2001-01-01

    La contabilización de aspectos ambientales adquiere creciente relevancia para las empresas, en la medida que el deterioro ambiental se convierte en un problema social y político a través de todo el mundo. A todo tipo de organizaciones se les requiere entregar información acerca de sus políticas y objetivos ambientales, de los programas y acciones destinados a lograr estos objetivos, de su generación de riesgos e impactos ambientales y de las medidas para reducirlos o mitigarlos. Si bien es ci...

  7. Educaçao ambiental

    OpenAIRE

    Carneiro,Danielle

    2013-01-01

    Resumo: A idéia desse trabalho surgiu no momento em que me inseri na comunidade de Pontal do Sul, envolvida em distintas atividades educativas com o mesmo público. Uma delas refere-se ao ensino público fundamental e outra à atividades de pesquisa e Educação Ambiental (EA) dentro de um projeto de extensão universitária. A EA vem sendo realizada de forma diversificada, baseada em diferentes concepções, fundamentadas em princípios e diretrizes construídos num momento de difusão da Ecologia e de ...

  8. Salinity and suspended matter variations in the Tay estuary

    Science.gov (United States)

    McManus, John

    2005-03-01

    The concept of salinity-induced density layering in estuaries was first demonstrated from the upper reaches of the Tay. In this study the nature of the layering and its variation through the tidal cycle is demonstrated from time series of observations taken at many locations within this estuary. Thorough mixing of the waters on the rising tide, as defined by depth profiles of salinity, is commonly replaced by salinity layering during the high water slack period. This condition continues into the falling tide. Frequently the mixed waters are abruptly replaced by stratified waters within the half-hourly sampling interval. This is attributed to the activity of longitudinal fronts, manifest as surficial foam bands, along which water masses shear past each other on both the flood and ebb tides. Offsetting of transverse salinity coutours along the fronts is introduced to explain apparent complexities in surface water salinity distributions measured at high water slack. Suspended particulate matter concentrations increase towards the limit of the saline water intrusion before decreasing headwards into the freshwater zone of the estuary. The suspensions in the water column may also be displaced by the lateral offsetting of the waters along the fronts. The recognition of the presence of fronts, and a knowledge of their impact on the estuarine waters may provide an alternative means of understanding the flow characteristics of these challenging water bodies. The techniques of spatial and temporal averaging normally widely used today may not be the most realistic approach to analysis of the flows.

  9. Benchmarking an unstructured grid sediment model in an energetic estuary

    Science.gov (United States)

    Lopez, Jesse E.; Baptista, António M.

    2017-02-01

    A sediment model coupled to the hydrodynamic model SELFE is validated against a benchmark combining a set of idealized tests and an application to a field-data rich energetic estuary. After sensitivity studies, model results for the idealized tests largely agree with previously reported results from other models in addition to analytical, semi-analytical, or laboratory results. Results of suspended sediment in an open channel test with fixed bottom are sensitive to turbulence closure and treatment for hydrodynamic bottom boundary. Results for the migration of a trench are very sensitive to critical stress and erosion rate, but largely insensitive to turbulence closure. The model is able to qualitatively represent sediment dynamics associated with estuarine turbidity maxima in an idealized estuary. Applied to the Columbia River estuary, the model qualitatively captures sediment dynamics observed by fixed stations and shipborne profiles. Representation of the vertical structure of suspended sediment degrades when stratification is underpredicted. Across all tests, skill metrics of suspended sediments lag those of hydrodynamics even when qualitatively representing dynamics. The benchmark is fully documented in an openly available repository to encourage unambiguous comparisons against other models.

  10. Radiocaesium distribution in the sediment of a Fukushima river estuary

    Science.gov (United States)

    Hagiwara, Hiroki; Konishi, Hiromi; Nakanishi, Takahiro; Harada, Hisaya; Tsuruta, Tadahiko

    2016-04-01

    On fluvial discharge, paticulate fractions are the main carrier of radiocaesium from land to aquatic bodies such as rivers, lakes and the sea [1]. However, within river estuaries, where there is a drastic increase in salinity, fine particles generally flocculate (in the size order of several tens μm) before settling out and being deposited on the river bed [2]. In this study, we investigated the sediment records and the distribution of radiocaesium within the estuary of the Odaka river in January 2014, located approximately 17 km north of the Fukushima Dai-ichi Nuclear Power Plant. Based on distribution of salinity, the environment of the Odaka river is divided into three areas; the freshwater area, the estuarine marine area that was filled with saline water from surface to bottom and the brackish area between these two. Radiocaesium deposition ranged from 45 to 1070 kBq m-2 with the inventory of radiocaesium in the estuary being significantly greater in the brackish area relative to both the freshwater and estuarine marine areas. Particle size dependency of radiocaesium concentration in the sediments showed that the distribution with relatively higher concentration was expected in the brackish area. The possibility of flocculation in the brackish area will be discussed. References [1] Nagao, S., Kanamori, M., Ochiai, S., Tomihara, S., Fukushi, K., and Yamamoto, M., 2013, Biogeosciences, v. 10, no. 10, p. 6215-6223. [2] Droppo, I. G., and Ongley, E. D., 1994, Water Research, v. 28, no. 8, p. 1799-1809.

  11. Large wood in the Snowy River estuary, Australia

    Science.gov (United States)

    Hinwood, Jon B.; McLean, Errol J.

    2017-02-01

    In this paper we report on 8 years of data collection and interpretation of large wood in the Snowy River estuary in southeastern Australia, providing quantitative data on the amount, sources, transport, decay, and geomorphic actions. No prior census data for an estuary is known to the authors despite their environmental and economic importance and the significant differences between a fluvial channel and an estuarine channel. Southeastern Australian estuaries contain a significant quantity of large wood that is derived from many sources, including river flood flows, local bank erosion, and anthropogenic sources. Wind and tide are shown to be as important as river flow in transporting and stranding large wood. Tidal action facilitates trapping of large wood on intertidal bars and shoals; but channels are wider and generally deeper, so log jams are less likely than in rivers. Estuarine large wood contributes to localised scour and accretion and hence to the modification of estuarine habitat, but in the study area it did not have large-scale impacts on the hydraulic gradients nor the geomorphology.

  12. Leaf litter ecological fate in the Schelde estuary in Belgium

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Two dominant species of Willow (Salix triandra) and Reed(Phragmites australis) along the Schelde estuary (in Belgium) wereselected in this research. The pigments of higher plant was used asbiomarkers, the decomposition process of the two species werestudied after they fall into the Schelde estuary. After statisticalanalysis (Spearman rank order correlation, p<0.05), the results hasshown the decomposition dynamics pattern of the pigments, and thewillow showed different pattern in comparing with the reed, eg.Chlorophyll-a decomposition dynamics for willow is: y1 = 12196x2 -175895x + 1E + 06 + k, R2 = 0.5706 while for reed is: y2 = -37878x2+ 229782x + 734282 + k, R2 = 0.9065. The precise time of the leaflitter spent in the water was also calculated as were less than 24days, 24-37 days, longer than 37 days (willow) and less than 24days, longer than 24 days (reed), the leaf litter fate of the two -Process, Institute of Applied Ecology, Chinese Academy of Sciencesdominant species in the Schelde estuary was also compared.

  13. Production by microphytobenthos in the Swan-Canning Estuary

    Science.gov (United States)

    Masini, R. J.; McComb, Arthur J.

    2001-09-01

    Intact sediment cores containing microphytobenthos, dominated by episammic diatoms, were collected from shallow sand flats of the Swan-Canning Estuary, Perth, southwestern Australia, and their photosynthesis-light relations deduced from changes in oxygen (17 cores) or pH (13 cores). The theoretical saturating light intensity Ik determined from O2 was 107 µE m-2 s-1, and the light intensity at which photosynthesis is saturated, Isat, was about 1100 µE m-2 s-1. Mean gross production and respiration increased with temperature. Infaunal contributions to total respiration were measured for two cores at about 30%.The sediment photic zone was estimated as 0·5 mm in fine sediments of the upper estuary and 3·5 mm in coarse sediments of the lower estuary. Microalgae from below the photic zone photosynthesized on exposure to light. Biomass (measured as chlorophyll a) decreased down the sediment profile and was linearly correlated with net and gross maximum photosynthesis. Relative photosynthetic efficiencies were high, and light compensation increased with increasing depth in the sediment.Q

  14. Eelgrass Enhancement and Restoration in the Lower Columbia River Estuary, Period of Performance: Feb 2008-Sep 2009.

    Energy Technology Data Exchange (ETDEWEB)

    Judd, C.; Thom, R; Borde, A. [Pacific Northwest National Laboratory

    2009-09-08

    The purpose of this study was to evaluate the ability to enhance distribution of eelgrass (Zostera marina) in the Columbia River Estuary to serve as refuge and feeding habitat for juvenile salmon, Dungeness crab, and other fish and wildlife. We strongly suspected that limited eelgrass seed dispersal has resulted in the present distribution of eelgrass meadows, and that there are other suitable places for eelgrass to survive and form functional meadows. Funded as part of the Bonneville Power Administration's call for Innovative Projects, we initiated a multistage study in 2008 that combined modeling, remote sensing, and field experimentation to: (1) Spatially predict habitat quality for eelgrass; (2) Conduct experimental plantings; and (3) Evaluate restoration potential. Baseline in-situ measurements and remote satellite observations were acquired for locations in the Lower Columbia River Estuary (LCRE) to determine ambient habitat conditions. These were used to create a habitat site-selection model, using data on salinity, temperature, current velocity, light availability, wave energy, and desiccation to predict the suitability of nearshore areas for eelgrass. Based on this model and observations in the field, five sites that contained no eelgrass but appeared to have suitable environmental conditions were transplanted with eelgrass in June 2008 to test the appropriateness of these sites for eelgrass growth. We returned one year after the initial planting to monitor the success rate of the transplants. During the year after transplanting, we carried out a concurrent study on crab distribution inside and outside eelgrass meadows to study crab usage of the habitat. One year after the initial transplant, two sites, one in Baker Bay and one in Young's Bay, had good survival or expansion rates with healthy eelgrass. Two sites had poor survival rates, and one site had a total loss of the transplanted eelgrass. For submerged aquatic vegetation (SAV) restoration

  15. Topographic monitoring of a middle estuary mudflat, Humber estuary, UK--anthropogenic impacts and natural variation.

    Science.gov (United States)

    Boyes, Suzanne J; Allen, James H

    2007-01-01

    Annual topographic surveys were carried out at the Saltend mudflat (Humber estuary, UK) between 1998 and 2006. These surveys formed part of an ongoing monitoring programme to examine the potential effects on the mudflat topography of the construction and operation of a waste water treatment works (WwTW) development by Yorkshire Water. Of particular concern was the potential disruption to the sedimentological regime within the special protection area (SPA) and candidate special area of conservation (cSAC) which could affect the invertebrate communities and ornithological functioning of the site. In addition to the development of the WwTW located to the extreme north-west of the site, a port extension removing 10ha of the Saltend intertidal mudflat (outside the SPA but immediately south east of the WwTW) also occurred between 1999 and 2006. Minimal change was noted across the site following the construction and operation of the WwTW between 1998 and 2000. However, the construction of the bund in closer proximity to the SPA and cSAC masked any potential impact the WwTW could have had across the site after 2000. Profiles and contour mapping indicate that significant mudflat accretion occurred in the immediate area of the bund, with a general increase recorded across the western section of the site since 2000. In contrast the alternations to channel planform and subsequent rapid accretion of the mudflat to the east of the jetty, being a significant distance from the developments, are attributed to natural cyclical changes.

  16. Residual fluxes of water and nutrient transport through the main inlet of a tropical estuary, Cochin estuary, West Coast, India

    Digital Repository Service at National Institute of Oceanography (India)

    Vinita, J.; Lallu, K.R.; Revichandran, C.; Muraleedharan, K.R.; Jineesh, V.K.; Shivaprasad, A.

    J., Lallu K.R., Muraleedharan K. R., Jineesh V.K., Shivaprasad A. Abstract Determining robust values for estuarine material fluxes has been a complex task and an interdisciplinary research challenge. With the advent of Acoustic Doppler... the focus of regional and global research to quantify fluxes of materials from the land to the coastal region which determines the anthropogenic effects on the coastal environment. The concentration of land-ocean fluxes in estuaries apparently offers...

  17. Variation in tidal wetland plant diversity and composition within and among coastal estuaries: assessing the relative importance of environmental gradients

    Science.gov (United States)

    Question: Does wetland plant composition vary more by estuarine type (differentiated by the degree of riverine versus oceanic influence) or habitat type within estuaries (defined by US National Wetlands Inventory [NWI] marsh classes)? Location: Oregon estuaries: Netarts Bay, ...

  18. Size Matters: The Contribution of Mega-Infauna to the Food Webs and Ecosystem Services of an Oregon Estuary

    Science.gov (United States)

    Large-bodied, invertebrates are common to infaunal communities of NE Pacific estuaries (e.g., bivalves, polychaetes, burrowing shrimps), but their contribution to the ecological structure, function and ecosystem services of most estuaries has been poorly characterized because the...

  19. Three-dimensional semi-idealized model for tidal motion in tidal estuaries. An application to the Ems estuary

    Science.gov (United States)

    Kumar, Mohit; Schuttelaars, Henk M.; Roos, Pieter C.; Möller, Matthias

    2016-01-01

    In this paper, a three-dimensional semi-idealized model for tidal motion in a tidal estuary of arbitrary shape and bathymetry is presented. This model aims at bridging the gap between idealized and complex models. The vertical profiles of the velocities are obtained analytically in terms of the first-order and the second-order partial derivatives of surface elevation, which itself follows from an elliptic partial differential equation. The surface elevation is computed numerically using the finite element method and its partial derivatives are obtained using various methods. The newly developed semi-idealized model allows for a systematic investigation of the influence of geometry and bathymetry on the tidal motion which was not possible in previously developed idealized models. The new model also retains the flexibility and computational efficiency of previous idealized models, essential for sensitivity analysis. As a first step, the accuracy of the semi-idealized model is investigated. To this end, an extensive comparison is made between the model results of the semi-idealized model and two other idealized models: a width-averaged model and a three-dimensional idealized model. Finally, the semi-idealized model is used to understand the influence of local geometrical effects on the tidal motion in the Ems estuary. The model shows that local convergence and meandering effects can have a significant influence on the tidal motion. Finally, the model is applied to the Ems estuary. The model results agree well with observations and results from a complex numerical model.

  20. Distribution and abundance of Cladocera (Branchiopoda in the Paraíba do Sul River estuary, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    José Mauro Sterza

    2006-12-01

    Full Text Available To characterize the cladoceran community of the Paraíba do Sul River estuary, located in the district of São João da Barra, Rio de Janeiro, Brazil, cladocerans were collected monthly in nine sampling stations from September 2002 until August 2003. Samples were obtained by subsurface tows using a plankton net with a 30 cm opening mouth and 70 micron mesh size, fitted with a mechanical flowmeter. Environmental parameters such as salinity and temperature were also obtained. Seventeen species of Cladocera were identified: Pseudoevadne tergestina, Penilia avirostris, Macrothrix triserialis, Moina micrura, Simocephalus kerhervei, Simocephalus vetalus, Simocephalus latirostris, Simocephalus serrulatus, Alona rectangula, Alona quadrangularis, Bosmina longirostris, Bosminopsis deitersi, Camptocercus dadayi, Ceriodaphnia richardi, Diaphanosoma fluviatile, Kurzia latissima and Pleuroxus similis. The highest total abundance of Cladocera occurred in April in the marine zone of the estuary. The most abundant species during this period was Penilia avirostris. At the mixing and freshwater zones of the estuary, the most abundant species were Moina micrura, mainly in January; and Simocephalus vetalus and Bosmina longirostris during spring. From this scenario, it can be inferred that the cladoceran community of the Paraíba do Sul River estuary presents characteristics of marine, brackish and freshwater environments. Temperature and salinity seem to limit the occurrence and distribution of cladocerans in the estuary.O presente estudo teve como objetivo caracterizar a comunidade zooplanctônica de cladóceros no estuário do Rio Paraíba do Sul, localizado no município de São João da Barra, RJ. O zooplâncton foi coletado mensalmente de setembro/2002 a agosto/2003 em nove estações através de arrastos subsuperficiais com uma rede de plâncton com abertura de boca de 30 cm e malha de 70 mµ, dotada de fluxômetro mecânico. Foram medidas simultaneamente a

  1. Optical properties of a tropical estuary during wet and dry conditions in the Nha Phu estuary, Khanh Hoa Province, south-east Vietnam

    DEFF Research Database (Denmark)

    Lund-Hansen, Lars Chresten; Hai, Doan Nhu; Lam, Nguyen Ngoc

    2010-01-01

    There has been a strong research focus on optical properties in temperate estuaries but very much less in tropical estuaries. These properties comprise light and beam attenuation dominated by suspended particulate matter, Chl a, and CDOM. Spatially and temporally distributed data on optical prope...... estuaries, was the episodic character with days of strong rainfall followed by longer periods of dry weather. All sampling, both wet and dry, was carried out in the dry season which implies a less definitive perception of wet and dry seasons....

  2. The dynamics of a frictionally-dominated Amazonian estuary

    Directory of Open Access Journals (Sweden)

    Nils Edvin Asp

    2012-09-01

    Full Text Available The hydrodynamics, morphology and sedimentology of the Taperaçu estuary were investigated. This is one of several estuaries located within the largest mangrove fringe in the world, bordering the Amazon region, subject to a macrotidal regime and regionally atypical negligible fresh water supply. The results reveal widespread sand banks that occupy the central portion of the estuarine cross-section. Well-sorted very fine sandy sediments of marine origin prevail. Shorter flood phases, with substantially higher current velocities, were observed in the upper sector of Taperaçu, as expected for a shallow, friction-dominated estuary. However, ebb domination can be expected for estuaries with large associated mangrove areas and substantial estuarine infilling, both of which situations occur on the Taperaçu. The tidal asymmetry favoring flood currents could be the result of the absence of an effective fluvial discharge. Furthermore, it was observed that the Taperaçu is connected by tidal creeks to the neighboring Caeté estuary, allowing a stronger flux during the flood and intensifying the higher flood currents. As a whole, the results have shown a complex interaction of morphological aspects (friction, fluvial drainage, connections with neighbor estuaries, infilling and large storage area in determining hydrodynamic patterns, thus improving the understanding of Amazon estuaries.A hidrodinâmica, morfologia e sedimentologia do estuário do Taperaçu foram investigadas. Este é um entre vários estuários do litoral amazônico que integram a maior extensão contínua de manguezais do mundo, apresentando uma descarga de água doce muito reduzida, atípica para a região. Os resultados revelam grandes bancos arenosos que ocupam em grande parte a porção central do estuário. Areias muito finas e bem selecionadas de origem marinha prevalecem. Fases de enchente mais curtas, com velocidades de corrente substancialmente mais altas, são observadas na por

  3. Hydrobiological characteristics of Shark River estuary, Everglades National Park, Florida

    Science.gov (United States)

    McPherson, B.F.

    1970-01-01

    Water quality in the Shark River estuary was strongly influenced by seasonal patterns of rainfall, water level and temperature. During the rainy season (summer and early fall) the salinity in the 20-mile long estuary ranged from that of fresh water to half that of sea water while concentrations of dissolved oxygen were low, 2-5 milligrams per liter (mg/l) presumably because, among other factors, microbial activity and respiration were accelerated by high temperatures (30-33 degrees C). During the dry season (late fall through spring) the salinity ranged from 18 grams per liter (g/l) in the headwaters to 36 g/l at the Gulf during a dry year such as 1967 and from 1 to 25 g/l during a wet year such as 1969. Concentrations of dissolved oxygen increased from 2-3 mg/l in the summer of 1967 to 4-7 mg/l in the winter of 1968, and temperature decreased from an average of about 30 degrees C in summer to 20 degrees C in winter. Water level declined 5 to 10 decimeters in the headwaters during the dry season, and salinity and tidal action increased. Large amounts of submerged vegetation died in some headwater creeks at the end of the dry season, presumably killed by salinities above 3 g/l. The decaying organic matter and the decrease in photosynthesis resulted in low dissolved oxygen (1-2 mg/l). Fish died at this time probably as a result of the low dissolved oxygen. Trace elements, heavy metals and insecticides occurred in the waters of the estuary in concentrations below those indicated as harmful for aquatic life by current standards established by the Federal Water Pollution Control Administration (1968). The insecticides detected were concentrated in sediment and in various organisms. The patterns of distribution of planktonic and small nektonic animals in the estuary were related to salinity. Copepods (Arcatia tonsa, Labidocera aestiva, Pseudodiaptomus coronatus), cumaceans (Cyclaspis sp.), chaetognaths (Sagitta hispida), bay anchovies (Anchoa mitchilli), and scaled

  4. Turbine airfoil with ambient cooling system

    Science.gov (United States)

    Campbell, Jr, Christian X.; Marra, John J.; Marsh, Jan H.

    2016-06-07

    A turbine airfoil usable in a turbine engine and having at least one ambient air cooling system is disclosed. At least a portion of the cooling system may include one or more cooling channels configured to receive ambient air at about atmospheric pressure. The ambient air cooling system may have a tip static pressure to ambient pressure ratio of at least 0.5, and in at least one embodiment, may include a tip static pressure to ambient pressure ratio of between about 0.5 and about 3.0. The cooling system may also be configured such that an under root slot chamber in the root is large to minimize supply air velocity. One or more cooling channels of the ambient air cooling system may terminate at an outlet at the tip such that the outlet is aligned with inner surfaces forming the at least one cooling channel in the airfoil to facilitate high mass flow.

  5. ¿Es Despistado o Está Despistado?: Infiriendo la Estabilidad de los Rasgos Psicológicos Is He Spaced Out (Just Now or Is He (Always Spaced Out?: Inferring the Stability of Psychological Traits

    Directory of Open Access Journals (Sweden)

    Paula Alonqueo

    2011-11-01

    Full Text Available Un rasgo psicológico descrito con el verbo ser se considera más estable que uno descrito con estar (Heyman & Diesendruck, 2002. Para establecer si esta distinción lingüística afecta a las inferencias sobre características personales se realizaron 2 estudios complementarios con 62 escolares en diferente nivel de desarrollo (7 y 12 años y 108 estudiantes universitarios monolingües de español peninsular, de nivel socioeconómico medio, residentes en Madrid, España. En ambos los participantes se distribuyeron en dos condiciones experimentales (ser y estar y respondieron a una tarea de inferencias en que se describían características psicológicas y conductas asociadas a estas. Se realizaron análisis multivariados y de medidas repetidas considerando la edad y la condición experimental. Solo los adultos y los niños mayores infirieron que los rasgos descritos con ser eran más estables que los descritos con estar, pero los menores en ambas condiciones experimentales infirieron que los rasgos eran estables. El efecto de ser y estar en las inferencias es relevante, pero debe interpretarse considerando las diferencias evolutivas.A psychological trait described with the verb ser is considered more stable than one expressed by using estar (Heyman & Diesendruck, 2002. In order to establish whether ser/estar verbal forms affect inferences about psychological traits, 2 studies were carried out on school children in different developmental levels (N = 62, 7 and 12 years and university students (N = 108, monolingual speakers of Peninsular Spanish, from medium socioeconomic status, resident in Madrid, Spain. In both studies participants were randomly assigned to one of 2 experimental conditions (ser and estar and responded to an inference task which consisted of the description of psychological characteristics and behaviors associated with them. Factorial and repeated measures analysis of variance were performed. Only the adults and older children

  6. Rasgos de historia de vida de especies en una comunidad vegetal alterada principalmente por pastoreo en un páramo húmedo (Parque Nacional Natural Chingaza, Colombia

    Directory of Open Access Journals (Sweden)

    Vargas Ríos Jesús Orlando

    2007-04-01

    Full Text Available Se estudiaron once rasgos de historia de vida (morfológicos y de regeneración de plantas vasculares, en
    cuatro sitios con diferente grado de alteración, que hacen parte de una misma unidad de paisaje y condiciones
    topográficas similares. Ubicados en los valles de los ríos Tunjo y Piedras Gordas, páramo de Palacio, parque nacional natural Chingaza, Cundinamarca, Colombia. Entre 3.400-3.600 m de altitud, a los 4º45’03’’N, 73º50’50’’W. Estos valles, principalmente el valle del río Tunjo tienen una larga historia de disturbio por quema y pastoreo de ganado vacuno. La comunidad natural es de Espeletia killipii, Chusquea tessellata y Calamagrostis effusa. Mediante un análisis de clasificación y un procedimiento de componentes principales (ACP se agruparon las especies de acuerdo a rasgos similares y se analizó su abundancia de acuerdo con el grado de alteración. Se identificaron tres grupos de especies, diferenciados principalmente por los rasgos morfológicos: tipo de planta, forma de crecimiento, hábito y altura. El grupo uno se caracteriza principalmente por especies graminoides (73%, erectas (100% en macolla (68% con alturas mayores a 5 cm (60%; el grupo dos por hierbas rastreras o postradas (76 % que forman cojines o tapetes (86% con alturas menores a 5 cm (79% y el grupo tres por hierbas (88% en roseta (100% que no forman cojines o tapetes. Cada uno de estos grupos, presentaron una máxima abundancia-cobertura a un grado de alteración en particular; el grupo uno, no es favorecido en su abundancia-cobertura al aumentar el grado de
    alteración, presenta su mayor abundancia en los sitios con alteración leve y sin alteración (33 y 30%; el grupo dos es característico del sitio con alteración alta, donde presento la mayor abundancia (44% y el grupo tres presentó su menor abundancia en el sitio con mayor grado de alteración (8%.

  7. Det ambientes fænomenologi

    DEFF Research Database (Denmark)

    Walther-Hansen, Mads

    2014-01-01

    Det ambiente: sansning, medialisering, omgivelse er et aktuelt og ambitiøst værk. Bogen skildrer hvordan ambiente fænomener har fået en stigende betydning i den moderne verden, og redegør for måden hvorpå det ambiente virker ind på hele vores oplevelseskultur. Det er en levende, uprætentiøs og frem...

  8. Intellectual productivity under task ambient lighting

    OpenAIRE

    2016-01-01

    A subjective experiment was conducted to evaluate intellectual productivity in three lighting conditions: (a) conventional ambient lighting, (b) task ambient lighting with normal colour temperature (5000 K), and (c) task ambient lighting with high colour temperature (6200 K). In the experiment, cognitive tasks were given to 24 participants. The concentration time ratio, which is a quantitative and objective evaluation index of the degree of concentration, was measured. The results showed that...

  9. Predicateμ-Calculus for Mobile Ambients

    Institute of Scientific and Technical Information of China (English)

    Hui-Min Lin

    2005-01-01

    Ambient logics have been proposed to describe properties for mobile agents which may evolve over time as well as space. This paper takes a predicate-based approach to extending an ambient logic with recursion, yielding a predicate t-calculus in which fixpoint formulas are formed using predicate variables. An algorithm is developed for model checking finite-control mobile ambients against formulas of the logic, providing the first decidability result for model checking a spatial logic with recursion.

  10. Ambient noise near the sea-route

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Ambient noise data measured in an experiment conducted in shallow water near a sea-route were analyzed. It was observed that, at low frequency, the horizontal correlation has an obvious difference from that predicted by the classical ambient noise model. The theoretical analyses show that this phenomenon is caused by wind noise together with the discrete shipping noise nearby. An ambient noise model was proposed to include the effects caused by both the noise sources. Data measured at different times verify that the proposed model can be used to forecast the ambient noise field in shallow water near the sea-route.

  11. Ambient noise near the sea-route

    Institute of Scientific and Technical Information of China (English)

    HE Li; LI ZhengLin; PENG ZhaoHui

    2009-01-01

    Ambient noise data measured in an experiment conducted in shallow water near a sea-route were analyzed. It was observed that, at low frequency, the horizontal correlation has an obvious difference from that predicted by the classical ambient noise model. The theoretical analyses show that this phenomenon is caused by wind noise together with the discrete shipping noise nearby. An ambient noise model was proposed to include the effects caused by both the noise sources. Data measured at different times verify that the proposed model can be used to forecast the ambient noise field in shal-low water near the sea-route.

  12. Ambient temperature signalling in plants.

    Science.gov (United States)

    Wigge, Philip A

    2013-10-01

    Plants are exposed to daily and seasonal fluctuations in temperature. Within the 'ambient' temperature range (about 12-27°C for Arabidopsis) temperature differences have large effects on plant growth and development, disease resistance pathways and the circadian clock without activating temperature stress pathways. It is this developmental sensing and response to non-stressful temperatures that will be covered in this review. Recent advances have revealed key players in mediating temperature signals. The bHLH transcription factor PHYTOCHROME INTERACTING FACTOR4 (PIF4) has been shown to be a hub for multiple responses to warmer temperature in Arabidopsis, including flowering and hypocotyl elongation. Changes in chromatin state are involved in transmitting temperature signals to the transcriptome. Determining the precise mechanisms of temperature perception represents an exciting goal for the field.

  13. Salt intrusion in multi-channel estuaries: a case study in the Mekong Delta, Vietnam

    Directory of Open Access Journals (Sweden)

    A. D. Nguyen

    2006-01-01

    Full Text Available There is a well-tested theory for the computation of salt intrusion in alluvial estuaries that is fully analytical and predictive. The theory uses analytical equations to predict the mixing behaviour of the estuary based on measurable quantities, such as channel topography, river discharge and tidal characteristics. It applies to single-channel topographies and estuaries that demonstrate moderate tidal damping. The Mekong delta is a multi-channel estuary where the tide is damped due to a relatively strong river discharge (in the order of 2000 m3/s, even during the dry season. As a result the Mekong is a strongly riverine estuary. This paper aims to test if the theory can be applied to such a riverine multi-channel estuary, and to see if possible adjustments or generalisations need to be made. The paper presents salt intrusion measurements that were done by moving boat in 2005, to which the salt intrusion model was calibrated. The theory has been expanded to cater for tidal damping. Subsequently the model has been validated with observations made at fixed locations over the years 1998 and 1999. Finally it has been tested whether the Mekong calibration fits the overall predictive equations derived in other estuaries. The test has been successful and led to a slight adjustment of the predictive equation to cater for estuaries that experience a sloping bottom.

  14. Mixing and flushing time scales in the Azhikode Estuary, southwest coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Revichandran, C.; Pylee, A.

    Flushing time scales of the Azhikode Estuary, Kerala, India showed pronounced dry season and wet season signals as well as large inter-annual variation. Cumulative flushing time of the estuary varies from 4.8 tide cycles in April to 1.22 tide cycles...

  15. Demonstration and Hands-on Exercises with the Estuary Data Mapper

    Science.gov (United States)

    The U.S. Environmental Protection Agency (US EPA) is developing e-Estuary, a decision-support system for applications of the Clean Water Act in coastal management. E-Estuary has three elements: an estuarine geo-referenced relational database, watershed GIS coverages, and tools t...

  16. Biogeochemistry of the MAximum TURbidity Zone of Estuaries (MATURE): some conclusions

    NARCIS (Netherlands)

    Herman, P.M.J.; Heip, C.H.R.

    1999-01-01

    In this paper, we give a short overview of the activities and main results of the MAximum TURbidity Zone of Estuaries (MATURE) project. Three estuaries (Elbe, Schelde and Gironde) have been sampled intensively during a joint 1-week campaign in both 1993 and 1994. We introduce the publicly available

  17. Second international symposium on the biogeochemistry of model estuaries: Estuarine processes in global change

    Energy Technology Data Exchange (ETDEWEB)

    1991-12-31

    This report consists of abstracts of papers presented at the symposium of Biogeochemistry. The main topics discussed at the meeting are; nutrient and mineral cycling, trace element distribution, sources and sinks of estuaries, sedimentation, importance of organic matter, and other biogeochemical processes of estuaries.

  18. Nitrification in the Schelde estuary: methodological aspects and factors influencing its activity

    NARCIS (Netherlands)

    De Bie, M.J.M.; Starink, Mathieu; Boschker, H.T.S.; Peene, J.; Laanbroek, H.J.

    2002-01-01

    We present a 15-month dataset on nitrification measurements in the Schelde estuary (Belgium and The Netherlands). Nitrification was estimated using the N-serve sensitive dark 14C-bicarbonate incorporation technique. A peak of nitrification activity was observed in the freshwater part of the estuary.

  19. Estimation of flushing time in a monsoonal estuary using observational and numerical approaches

    Digital Repository Service at National Institute of Oceanography (India)

    Manoj, N.T.

    . T sub(F) in the Mandovi estuary (a monsoonal estuary) on the west coast of India was studied. Field observations of salinity (FOS) and a numerical model were used to describe the T sub(F) during the south-west monsoon (heavy river discharge), post...

  20. The relationship between dissolved humic acids and soluble iron in estuaries

    Science.gov (United States)

    Fox, L. E.

    1984-01-01

    Dissolved humic acid and soluble iron appear to be chemically unassociated in estuaries despite their coincident removal. This conclusion is supported by differences in the aggregation kinetics of soluble iron and dissolved humic acid, the inability of extracted humic acid to stabilize laboratory preparations of ferric hydroxide, and decreasing ratios of humic acid carbon to soluble iron along the axes of some estuaries.

  1. Hydrologic data for the Salt Bayou estuary near Sabine Pass, Texas, October 1984 to March 1986

    Science.gov (United States)

    Fisher, J.C.

    1988-01-01

    The Salt Bayou estuary, located in extreme southeast Texas near Sabine Pass, has been altered by construction of the Gulf Intracoastal Waterway. The waterway has interrupted the historical saltwater-freshwater exchange in this important estuary. This alteration may have had a detrimental effect on fish production because of increased salinity, and on waterfowl production because of lower water levels.

  2. Simulation of Typhoon-Driven Waves in the Yangtze Estuary with Multiple-Nested Wave Models

    Institute of Scientific and Technical Information of China (English)

    XU Fu-min; Will Perrie; ZHANG Jun-lun; SONG Zhi-yao; Bechara Toulany

    2005-01-01

    Typhoon-generated waves are simulated with two numerical wave models, the SWAN model for the coastal and Yangtze Estuary domain, nested within the WAVEWATCHIII (WW3) for the basin-scale East China Sea domain. Typhoon No. 8114 is chosen because it was very strong, and generated high waves in the Estuary. WW3 was implemented for the East China Sea coarse-resolution computational domain, to simulate the waves over a large spatial scale and provide boundary conditions for SWAN model simulations, implemented on a fine-resolution nested domain for the Yangtze Estuary area. The Takahashi wind model is applied to the simulation of the East China Sea scale (3-hourly) and Yangtze Estuary scale (1-hourly) winds. Simulations of significant wave heights in the East China Sea show that the highest waves are on the right side of the storm track, and maxima tend to occur at the eastern deep-water open boundary of the Yangtze Estuary. In the Yangtze Estuary, incoming swell is dominant over locally generated waves before the typhoon approaches the Estuary. As the typhoon approaches the Estuary, wind waves and swell coexist, and the wave direction is mainly influenced by the swell direction and the complex topography.

  3. Nitrous oxide in the Schelde estuary: production by nitrification and emission to the atmosphere

    NARCIS (Netherlands)

    De Wilde, H.; De Bie, M.J.M.

    2000-01-01

    Concentrations of nitrous oxide (N2O), oxygen, nitrate, and ammonium, as well as nitrification activity were determined along the salinity gradient of the Schelde Estuary, Northwest Europe, in October 1993, March 1994, and July 1996, The entire estuary was always supersaturated with N2O. Concentrati

  4. 76 FR 55673 - Vulnerability Assessments in Support of the Climate Ready Estuaries Program: A Novel Approach...

    Science.gov (United States)

    2011-09-08

    ... Using Expert Judgment, Volume I: Results for the San Francisco Estuary Partnership and Volume II... Partnership (EPA/600/R-11/ 058a) and Vulnerability Assessments in Support of the Climate Ready Estuaries... (EPA/600/R-11/058b). The EPA also is announcing that Eastern Research Group, an EPA contractor...

  5. Tides in the Mandovi and Zuari estuaries, Goa, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Sundar, D.; Shetye, S.R.

    Mandovi and Zuari are two estuaries located in Goa, west coast of India. Variation of water level in the estuaries was monitored for a month at 13 locations using tide-poles during March–April 2003. Analysis of this data has provided for the first...

  6. A law & economics approach to the study of integrated management regimes of estuaries

    NARCIS (Netherlands)

    Griendt, van de Wim

    2004-01-01

    In this paper it is proposed to analyse legal regimes for integrated management of estuaries with the help of institutional legal theory and the Schlager & Ostrom framework for types of ownership. Estuaries are highly valued and valuable and therefore need protection. The problem is that they qualif

  7. Implications of the divergent use of a suite of estuaries by two exploited marine fish species.

    Science.gov (United States)

    Potter, I C; Chuwen, B M; Hesp, S A; Hall, N G; Hoeksema, S D; Fairclough, D V; Rodwell, T M

    2011-09-01

    Biological characteristics of the marine species King George whiting Sillaginodes punctatus and Australian herring Arripis georgianus in three seasonally open estuaries (Broke, Irwin and Wilson Inlets), one permanently open estuary (Oyster Harbour) and one normally closed estuary (Wellstead Estuary) on the south coast of Western Australia have been determined and compared. Sillaginodes punctatus enters the seasonally and permanently open estuaries early in life and reaches total lengths (L(T)) >280 mm at which it can be legally retained and thus contributes to commercial and recreational fisheries in these systems. This sillaginid almost invariably emigrates from these estuaries before reaching its typical size at maturity (L(T50)) and does not return after spawning in marine waters. In contrast, virtually all female A. georgianus (≥ 98%) in the three seasonally open estuaries and the majority in the normally closed (89·5%) and permanently open estuaries (83%) exceeded the L(T50) of this species at maturity, reflecting the fact that the nursery areas of this species are predominantly located much further to the east. Although adult females of A. georgianus in seasonally open and normally closed estuaries had developed mature ovaries by autumn, at which time they were prevented from migrating to the sea by closure of the estuary mouths, this species did not spawn in those estuaries. The oocytes in their ovaries were undergoing extensive atresia, a process that had been incipient prior to oocyte maturation. As the adult females of A. georgianus in the permanently open Oyster Harbour at this time all possessed resting gonads, i.e. their oocytes were all previtellogenic, the adults that were present in that estuary earlier and were destined to spawn in autumn must have emigrated from that permanently open estuary to their marine spawning areas prior to the onset of gonadal recrudescence. The body masses at length of A. georgianus, which were almost invariably higher

  8. Caracterización de los rasgos esenciales de la identidad profesional de los trabajadores sociales, que integraban el Consejo de Graduados en Trabajo Social de la Provincia de Santa Cruz, durante los años 1970-1980

    Directory of Open Access Journals (Sweden)

    Lorena Lucia Julieta Meoniz

    2014-06-01

    Full Text Available El presente trabajo da cuenta de los avances realizados en la línea de indagación dedicada al estudio de los rasgos de la identidad profesional de los Trabajadores Sociales adscriptos al Consejo de Graduados en Trabajo Social de la Provincia de Santa Cruz durante los años 1970-1980. Para dicho análisis se tuvo en cuenta los datos y materiales aportados por la sistematización de los Libros de Actas N° 1 y 2 del Consejo Profesional de Graduados en Trabajo Social de la Provincia de Santa Cruz, incluyendo asimismo la lectura de los avances teóricos producidos por el equipo de trabajo del proyecto de investigación en el cual participamos como becadas.

  9. Perennial grasses traits as functional markers of grazing intensity in basaltic grasslands of Uruguay Rasgos de gramíneas perennes como marcadores funcionales de la intensidad de pastoreo en pastizales de basalto en Uruguay

    Directory of Open Access Journals (Sweden)

    Martin Jaurena

    2012-12-01

    Full Text Available Natural grasslands in the basaltic region of Uruguay are threatened by an increase in stocking rates and changes in land use. To assess the effect of grazing intensification, plant functional types are proposed as simple tools to aid the monitoring and management of vegetation. In the present study we evaluated the effect of stocking rate increase at community level taking into account plant traits of 23 dominant perennial grass species. In order to identify plant functional types, we determined the grazing response in an experiment with two wethers stocking rates (0.78 and 1.56 livestock units ha-1 quantifying species cover and traits values. Leaf dry matter content (LDMC and specific leaf area (SLA were the traits that best described the perennial grasses response to the stocking rate increase and therefore are suggested to be used as functional markers. Three functional types were identified. Low stocking rates were related to functional type A (tall, warm season species with low SLA and high LDMC and functional type B (tall, cool-season species, with intermediate levels of leaf traits. On the other hand, high stocking rate encouraged functional type C (prostrate, warm season species, with high SLA and low LDMC. The classification of a highly diverse community into three functional types and the selection of traits as functional markers candidates is an innovative approach to develop simple and general methods to diagnosis the state of basaltic grasslands in Uruguay and to advise on its management.Las praderas naturales de la region bas áltica de Uruguay están amenazadas por el incremento de la carga animal y cambios en el uso del suelo. Para evaluar el efecto del pastoreo se han propuesto los grupos funcionales como una herramienta simple para el monitoreo y manejo de la vegetación. El presente estudio evaluó el efecto del incremento de la carga animal considerando rasgos de 23 especies de gramineas perennes dominantes. Para identificar

  10. Cruise observation and numerical modeling of turbulent mixing in the Pearl River estuary in summer

    Science.gov (United States)

    Pan, Jiayi; Gu, Yanzhen

    2016-06-01

    The turbulent mixing in the Pearl River estuary and plume area is analyzed by using cruise data and simulation results of the Regional Ocean Model System (ROMS). The cruise observations reveal that strong mixing appeared in the bottom layer on larger ebb in the estuary. Modeling simulations are consistent with the observation results, and suggest that inside the estuary and in the near-shore water, the mixing is stronger on ebb than on flood. The mixing generation mechanism analysis based on modeling data reveals that bottom stress is responsible for the generation of turbulence in the estuary, for the re-circulating plume area, internal shear instability plays an important role in the mixing, and wind may induce the surface mixing in the plume far-field. The estuary mixing is controlled by the tidal strength, and in the re-circulating plume bulge, the wind stirring may reinforce the internal shear instability mixing.

  11. Seasonal dynamics and conservative mixing of dissolved organic matter in the temperate eutrophic estuary Horsens Fjord

    DEFF Research Database (Denmark)

    Markager, S.; Stedmon, C.A.; Søndergaard, M.

    2011-01-01

    parameters such as DOC and two terrestrial humic components behaved conservatively. The same was true for DON during winter. These results are consistent with the finding that autochthonous DOM was the dominant source of DOM in this estuary. The molar C:N and C:P ratios for DOM (DOC:DON and DOC......:DOP) in freshwater were 11 and 758, respectively. The DOC:DON ratio increased in the estuary during the productive season to average values between 13 and 17, due to accumulation of DOC and removal of DON. The DOC:DOP ratio decreased within the estuary showing that in general DOM was enriched with phosphorous......, however, during the spring, when phosphorous was limiting, the DOC:DOP ratio increased due to low DOP concentrations. We hypothesise that in estuaries with high loadings of inorganic nutrients relative to DOM, production and degradation of DOM within the estuary will dominate over allochthonous inputs...

  12. Nutrient transport to the Swan-Canning Estuary, Western Australia

    Science.gov (United States)

    Peters, Norman E.; Donohue, Robert

    2001-09-01

    Catchment nutrient availability in Western Australia is primarily controlled by the disposal of animal waste and the type and rate of fertilizer application, particularly on the relatively narrow (25 km wide), sandy coastal plain. Nitrogen (N) and phosphorus (P) concentrations and fluxes during the wet season of 15 tributaries, including four urban drains to the Swan-Canning Estuary, were evaluated from 1986 to 1992 and additionally concentrations only were evaluated throughout the year from 1993 to 1996. Concentrations of filtered reactive P (FRP) and total P (TP) were generally low, with the volume-weighted means for all sites being 0·06 mg l-1 and 0·12 mg l-1 respectively. The urban drains had higher TP concentrations (volume-weighted mean of 0·21 mg l-1) than the streams (0·12 mg l-1), with the high concentrations associated with particulate matter. Total inorganic N (TIN, NH4N plus NO3N) and total N (TN), which is of interest to eutrophic status of the N-limited estuary, were likewise low, compared with other developed areas having a similar climate. Both TIN and TN were higher in the urban drains (0·76 mg l-1 and 1·5 mg l-1 respectively) than the streams (0·31 mg l-1 and 1·2 mg l-1 respectively). The Avon River, which drains 98·5% of the 121 000 km2 catchment area, contributes most of the N (0·03 kg ha-1 year-1 or 65%) and a high percentage of the P (<0·01 kg ha-1estuaries. The Avon River nutrient fluxes are much less than other tributaries closer to the estuary. The coastal plain receives significantly higher rainfall (1,200 mm year

  13. An Experimental Study on Major Element Release from the Sediments in the Changjiang (Yangtze River) Estuary

    Institute of Scientific and Technical Information of China (English)

    GUO Yanwei; YANG Shouye

    2015-01-01

    With the enhanced warming and acidification of global ocean, whether and to what extent the naturally-weathered fluvial sediment into the sea can release elements and thus influence the geochemical process and ecosystem of global ocean remain to be resolved. In this contribution, an experimental study was carried out to examine the release rates of major elements (Ca, K, Mg and Al) from the surface sediments in the Changjiang (Yangtze River) Estuary under the pH values of 4.0, 6.0 and 7.0. The two studied sediments consist primarily of quartz, plagioclase, calcite and clay minerals, with the BET (Brunauer, Emmett and Teller) surface areas of 61.7m2g-1 and 23.1m2g-1. Major elements of Ca, K, Mg and Al show different release rates under different solution pH values. With the decreasing solution pH, the release rates of Ca and K increase obviously, while the release rates of Mg and Al increase with the initial solution pH varying from 6.0 to 7.0. The different release rates of these elements are closely related to the original mineral composition of the sediments and the reaction kinetics. Based on the experimental observation, quartz and clay minerals that have low dissolution rates may dominate the major element release to the aqueous phase. This study reveals that the en-hancing ocean acidification could cause considerable release of major elements from natural terrigenous sediments into the ambient marine environment, which has to be considered carefully in the future study on global change.

  14. Temporal changes in physical, chemical and biological sediment parameters in a tropical estuary after mangrove deforestation

    Science.gov (United States)

    Ellegaard, Marianne; Nguyen, Ngoc Tuong Giang; Andersen, Thorbjørn Joest; Michelsen, Anders; Nguyen, Ngoc Lam; Doan, Nhu Hai; Kristensen, Erik; Weckström, Kaarina; Son, Tong Phuoc Hoang; Lund-Hansen, Lars Chresten

    2014-04-01

    Dated sediment cores taken near the head and mouth of a tropical estuary, Nha-Phu/Binh Cang, in south central Viet Nam were analyzed for changes over time in physical, chemical and biological proxies potentially influenced by removal of the mangrove forest lining the estuary. A time-series of satellite images was obtained, which showed that the depletion of the mangrove forest at the head of the estuary was relatively recent. Most of the area was converted into aquaculture ponds, mainly in the late 1990's. The sediment record showed a clear increase in sedimentation rate at the head of the estuary at the time of mangrove deforestation and a change in diatom assemblages in the core from the mouth of the estuary indicating an increase in the water column turbidity of the entire estuary at the time of the mangrove deforestation. The proportion of fine-grained sediment and the δ13C signal both increased with distance from the head of the estuary while the carbon content decreased. The nitrogen content and the δ15N signal were more or less constant throughout the estuary. The proportion of fine-grained material and the chemical proxies were more or less stable over time in the core from the mouth while they varied synchronously over time in the core from the head of the estuary. The sediment proxies combined show that mangrove deforestation had large effects on the estuary with regard to both the physical and chemical environment with implications for the biological functioning.

  15. A framework for investigating general patterns of benthic β-diversity along estuaries

    Science.gov (United States)

    Barros, Francisco; Blanchet, Hugues; Hammerstrom, Kamille; Sauriau, Pierre-Guy; Oliver, John

    2014-08-01

    The description of major patterns in beta (β) diversity is important in order to understand changes in community composition and/or richness at different spatial and temporal scales, and can interrogate processes driving species distribution and community dynamics. Human impacts have pushed many estuarine systems far from their historical baseline of rich, diverse, and productive ecosystems. Despite the ecological and social importance of estuaries, there has not yet been an attempt to investigate patterns of β-diversity and its partitioning along estuarine systems of different continents. We aimed to evaluate if benthic assemblages would show higher turnover than nestedness in tropical than in temperate systems, if well-known impacted estuaries would show greater nestedness than less polluted systems, and to propose a conceptual framework for studying benthic macrofauna beta diversity along estuaries. We analyzed subtidal benthic macrofaunal data from estuaries in Brazil, USA and France. We estimated alpha (α), beta (β) and gamma (γ) diversity for each sampling time in each system, investigated patterns of β -diversity as multivariate dispersion and the partitioning (nestedness and replacement) of β-diversity along each estuary. There was a decrease in the α-diversity along marine to freshwater conditions at most of the estuaries and sampling dates. Beta diversity as multivariate dispersion showed high variability. Most of the estuaries showed a greater proportion of the β-diversity driven by replacement than nestedness. We suggest a conceptual framework for estuaries where relatively pristine estuaries would have their β-diversity mostly driven by replacement while impacted estuaries subjected to several anthropogenic stressors would show total nestedness or total replacement, depending on the stress.

  16. Heavy Metals (Cd, Cu, Cr, Pb and Zn) in Meretrix meretrix Roding, Water and Sediments from Estuaries in Sabah, North Borneo

    Science.gov (United States)

    Abdullah, Mohd. Harun; Sidi, Jovita; Aris, Ahmad Zaharin

    2007-01-01

    Concentrations of heavy metals (Cd, Cu, Cr, Pb and Zn) in tissues of Meretrix meretrix Roding (M. meretrix R.), water and sediments from two estuaries were determined. One estuary is located in an urban area of Kota Kinabalu (Likas estuary) and the other in a rural district of Kota Belud (Kota Belud estuary), where both are in Sabah, North of…

  17. Aggregate Settling Velocities in San Francisco Estuary Margins

    Science.gov (United States)

    Allen, R. M.; Stacey, M. T.; Variano, E. A.

    2015-12-01

    One way that humans impact aquatic ecosystems is by adding nutrients and contaminants, which can propagate up the food web and cause blooms and die-offs, respectively. Often, these chemicals are attached to fine sediments, and thus where sediments go, so do these anthropogenic influences. Vertical motion of sediments is important for sinking and burial, and also for indirect effects on horizontal transport. The dynamics of sinking sediment (often in aggregates) are complex, thus we need field data to test and validate existing models. San Francisco Bay is well studied and is often used as a test case for new measurement and model techniques (Barnard et al. 2013). Settling velocities for aggregates vary between 4*10-5 to 1.6*10-2 m/s along the estuary backbone (Manning and Schoellhamer 2013). Model results from South San Francisco Bay shoals suggest two populations of settling particles, one fast (ws of 9 to 5.8*10-4 m/s) and one slow (ws of Brand et al. 2015). While the open waters of San Francisco Bay and other estuaries are well studied and modeled, sediment and contaminants often originate from the margin regions, and the margins remain poorly characterized. We conducted a 24 hour field experiment in a channel slough of South San Francisco Bay, and measured settling velocity, turbulence and flow, and suspended sediment concentration. At this margin location, we found average settling velocities of 4-5*10-5 m/s, and saw settling velocities decrease with decreasing suspended sediment concentration. These results are consistent with, though at the low end of, those seen along the estuary center, and they suggest that the two population model that has been successful along the shoals may also apply in the margins.

  18. Environmental monitoring of the Zhujiang Estuary and its coastal waters

    Institute of Scientific and Technical Information of China (English)

    J. C. Chen(陈介中); L. Dong; L. A. Wong; G. W. Heinke

    2002-01-01

    The Zhujiang (Pearl River ) Estuary is a complex water system whose catchments basin coveers a very large part of southern China. The large quantity of fresh water carried by the river system flows into the northern coast of the South China Sea through its eight inlets. The Zhujiang River Delta has experienced the fastest economic growth in China during the past two decades. Rapid population expansion and increased industrial development coupled with insufficient waste management turned the Zhujiang Estuary into waste disposal channels just before entering the coastal waters. The water quality of the estuaries and the coastal oceans has become polluted. Dttfing the past two years, an intensive study and monitoring efforts of the pollutions of these waters have been made. A systematic and integrated monitoring task including shore-based measurements, shipboard in-situ measurements, and satellite and radar remote sensing surveys has been completed. Conprehensive collection of physical,chemical and biological parameters has been accomplished and a database has been established. Unlike the previous large scale-monitoring task in which the various pollutant concentrations were the objective,the present study aims to understand the process of the pollution from their initial disposal to their final states. The understanding of the processes makes it possible to evaluate the severity of the pollution with respect to the sustainability. Also the objective is to incorporate these processes into the mathematical models from which a predictive capability of the pollution situation can be realized. The present presentation will describe the planning, methodology and the results of this effort.

  19. Tsunami flooding along Tagus estuary, Portugal, the 1531 event

    Science.gov (United States)

    Baptista, M. A.; Miranda, J. M.; Batlo, J.; Ferreira, H.

    2012-04-01

    TSUNAMI FLOODING ALONG TAGUS ESTUARY (PORTUGAL), THE 1531 EVENT The city of Lisbon one of the main towns in Europe between the XVI and XVIII centuries was severely damaged by two strong earthquakes: 1531-01-26 and 1755-11-01 and the companion tsunamis. In this study we present a re-evaluation of the data available for this event. The 26 January 1531 earthquake occurred between 4 and 5 am and was felt mainly in Lisbon and surroundings dwellings along the Tagus river estuary. The shock heavily destroyed Lisbon downtown causing approximately 1000 casualties Two foreshocks preceded the event: on the 2nd and the 7th January 1531, respectively. The maximum MSK intensity is IX, making it one of the most disastrous earthquakes in the recent history of Portugal. The historical descriptions clearly describe the observation of high waves and the ships touching the riverbed. Although, the difference between tsunamis and storms is sometimes unclear in some historical documents, in this case, the occurrence of the of the earthquake definitively states clearly excludes the hypothesis of a storm. Moreover, the king's chronicle clearly states the observation of high waves and the lack of wind. Other reports consistent with the occurrence of a tsunami are the observation of strong fluxes and refluxes in the river the division of islands into smaller ones and the observation of the riverbed. In this study we present a re-appraisal of the historical information available, a new isoseismal map and the relocation of the epicentre. Finally, we present a tsunami simulation and propagation along a section of 70 km along Tagus estuary compatible with the earthquake data and the historical accounts.

  20. The importance of estuary head waters as nursery areas for young estuary- and marine-spawned fishes in temperate South Africa

    Science.gov (United States)

    Wasserman, Ryan J.; Strydom, Nadine A.

    2011-07-01

    The restriction of freshwater flow into estuaries, the presence of in-stream barriers and the occurrence of invasive fish species in these habitats are identified as major threats to these young estuary- and marine-spawned fish species. These aspects have been investigated using the distribution and abundance of young estuary- and marine-spawned fish species in the headwater environments of four permanently open estuaries of the Eastern Cape, South Africa. Fishes were collected twice per season over the 2009 and 2010 period, using mixed method sampling with seine net hauls and overnight fyke net deployments. Of the 74,751 fishes collected, 37,444 fishes, 18 families and 34 species were taken in fyke net catches, while 34,308 fishes, 21 families and 38 species were caught in seine nets. In the Great Fish, Kowie, Kariega and Sundays River systems, juveniles of estuarine residents dominated headwater catches, followed by juveniles of estuary-dependent marine species. The prevalence of larval and small juvenile stages of estuary- and marine-spawned fish species highlights the potential importance of these transitional areas for young fish.

  1. Spatial Analysis of BioAmbients

    DEFF Research Database (Denmark)

    Nielson, Hanne Riis; Nielson, Flemming; Pilegaard, Henrik

    2004-01-01

    Programming language technology can contribute to the development and understanding of Systems Biology by providing formal calculi for specifying and analysing the dynamic behaviour of biological systems. Our focus is on BioAmbients, a variation of the ambient calculi developed for modelling...

  2. Control Flow Analysis for BioAmbients

    DEFF Research Database (Denmark)

    Nielson, Flemming; Nielson, Hanne Riis; Priami, C.

    2007-01-01

    This paper presents a static analysis for investigating properties of biological systems specified in BioAmbients. We exploit the control flow analysis to decode the bindings of variables induced by communications and to build a relation of the ambients that can interact with each other. We...

  3. Ambiente e salute nei siti inquinati

    OpenAIRE

    Cori, Liliana

    2007-01-01

    Il 14 dicembre scorso si ? svolto a Roma il seminario "Studi su ambiente e salute nei siti inquinati: prospettive di sviluppo metodologico e applicativo" organizzato dall'istituto di fisiologia clinica del CNR e dal Dipartimento ambiente e connessa prevenzione primaria dell'Istituto Superiore di sanit?

  4. Hybrid Logical Analyses of the Ambient Calculus

    DEFF Research Database (Denmark)

    Bolander, Thomas; Hansen, Rene Rydhof

    2010-01-01

    In this paper, hybrid logic is used to formulate three control flow analyses for Mobile Ambients, a process calculus designed for modelling mobility. We show that hybrid logic is very well-suited to express the semantic structure of the ambient calculus and how features of hybrid logic can...

  5. The Mattole River Estuary: Restoration Efforts in a Dynamic System

    Science.gov (United States)

    Barber, D.; Liquori, M.

    2010-12-01

    Despite extensive scientific advancement integrating our understanding of hydrology, geomorphology, and ecology in recent decades, the application of restoration in the field has been slow to evolve. This presentation will highlight 20 years of restoration practices in the Mattole River Estuary and how these practices have informed our understanding of this complex system. The Mattole River Watershed is a 304 square-mile basin located near the Mendocino Triple Junction in a remote region of California known as the “The Lost Coast” for its rugged mountains and undeveloped coastline. In addition to numerous species of fish, mammals, and over 250 bird species, the Mattole Watershed is home to three Federally-listed Threatened salmonids: California Coastal Chinook salmon, Southern Oregon/Northern California Coasts coho salmon, and Northern California steelhead trout. The 64 mile-long river meets the Pacific Ocean at the northern end of the 64,000 acre King Range National Conservation Area (KRNCA), managed by the Bureau of Land Management (BLM). The watershed is dynamic, with some of the nation’s highest annual rainfall (mean = 158 cm/yr), naturally occurring steep slopes, erosive sedimentary geology, and frequent earthquakes. All of these factors have amplified the negative effects of extensive logging and associated road building between 1945 and 1970, which left a legacy of increased sediment loads and high water temperatures that have yet to recover to pre-disturbance levels, severely impairing riparian and aquatic habitats. Prior to major land disturbances, the Mattole estuary/lagoon was notable for its deep, thermally-stratified pools and numerous functioning north and south bank slough channels that flushed sediments from the river and received marine water. As flows decline in late spring, a sandbar closes off surface flow from the river to the Pacific Ocean, forming a lagoon, which persists until flows increase in the fall. Today, the estuary is poor

  6. Status of the belugas of the St Lawrence estuary, Canada

    OpenAIRE

    Michael CS Kingsley

    2002-01-01

    A population of belugas (Delphinapterus leucas) inhabiting the estuary of the St Lawrence river in Quebec, Canada, was depleted by unregulated hunting, not closed until 1979. Surveys in 1977 showed only a few hundred in the population. Surveys since then have produced increasing estimates of population indices. An estimate of the population, fully corrected for diving animals, was 1,238 (SE 119) in September 1997. The population was estimated to have increased from 1988 through 1997 by 31.4 b...

  7. Types of saltwater intrusion of the Changjiang Estuary

    Institute of Scientific and Technical Information of China (English)

    茅志昌; 沈焕庭; JamesT.Liu; D.Eisma

    2001-01-01

    The Changjiang Estuary is characterized by multi-order bifurcations, unsteady submerged sandbars, mid-channel sandbars, creeks and riffles. The following four types of saltwater intrusion are found: (1) direct intrusion from the sea; (2) intrusion during tidal flooding; (3) intrusion from tidal flats overflow; and (4) salt water coming upstream through other waterways. These result in a complicated temporal and spatial salinity distribution. A high chlorinity concentration zone exists from the Liuhekou to the Sidongkou along the South Branch. The salinity during neap tide or ordinary tide is higher than during spring tide.

  8. The herbicide Glyphosate affects nitrification in the Elbe estuary, Germany

    Science.gov (United States)

    Sanders, Tina; Lassen, Stephan

    2015-04-01

    The Elbe River is one of the biggest European rivers discharging into the North Sea. It also transports high amounts of nutrients and pollutants like pesticides. Important source regions of both nutrients and pollutants are located within the river catchment, which is dominated by agricultural land-use. From these agricultural soils, pesticides can be carried via the river and estuary into the North Sea. Glyphosate (N-(phosphonomethyl) glycine) is the most commonly used herbicide worldwide and mainly used to regulate unwanted plant growth and for the expedition of crop ripening. In Germany, ~ 6000 tons of glyphosate are applied yearly in agriculture and private use. Glyphosate is degradable by microorganisms and has a half-life in water of 35 to 60 days. This herbicide specifically inhibits 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), an enzyme that catalyzes the biosynthesis of essential aromatic amino acids in plants, fungi, and bacteria. Nitrifying bacteria, which play an important role in the internal nitrogen cycling in the Elbe estuary, also possess this enzyme. The aim of our study was to quantify the concentration of glyphosate in water and sediment samples of the Elbe to get an overview about relevant environmental levels and to assess the impact of glyphosate on inhibition of nitrifying activities. To quantify the effect of glyphosate on nitrification activity, natural samples as well as pure cultures of Nitrosomonas europea (strain Nm50) were incubated with different concentrations of glyphosate over a period of some weeks. The nitrifying activity was determined according to changes of the nitrite and nitrate concentration as well as the cell number. Glyphosate was detectable in water and sediment samples in the Elbe estuary with up to 5 ppb mainly in the Port of Hamburg region. In both incubation experiments an inhibiting effect of glyphosate on nitrification could be shown. The incubated natural water sample was affected by a glyphosate

  9. Measurement frequency and sampling spatial domains required to characterize turbidity and salinity events in the Guadalquivir estuary (Spain

    Directory of Open Access Journals (Sweden)

    E. Contreras

    2012-08-01

    Full Text Available Estuaries are complex systems in which long water quality data series are not always available at the proper scale. Data proceeding from several water quality networks, with different measuring frequencies (monthly, weekly and 15 min and different numbers of sampling points, were compared throughout the main channel of the Guadalquivir estuary. Higher frequency of turbidity sampling in the upper estuary is required. In the lower estuary, sampling points help to find out the ETM, and higher frequency sampling of EC is required because of the effect of the tidal and river components. This could be a feedback for the implementation of monitoring networks in estuaries.

  10. Modern and relict features in clayey cryogenic coils: Morphological and micromorphological identification Rasgos modernos y actuales en suelos criogénicos arcillosos: identificación morfológica y micromorfológica Características modernas e ancestrais de solos criogénicos argilosos: identificação morfológica e micromorfológica

    Directory of Open Access Journals (Sweden)

    Marina Lebedeva

    2013-11-01

    ímicas, los suelos representan un complejo edáfico que incluye Phaeozems Vérticos Lúvicos (Argílicos y Túrbicos y Phaeozems Lúvicos (Argílicos y Túrbicos. Los procesos de descomposición, agregación, eluviación, iluviación, edafoturbación, mineralización y endurecimiento resultan de la acumulación y transformación de la material orgánica, hielo-deshielo, contracción-expansión, translocación y crioturbación. El complejo edáfico se interpreta como poligenético. Las interpretaciones se han realizado para diferenciar los procesos de edafogénesis modernos de los relictos. Los rasgos más antiguos están datados del periodo glaciar frío del Pleistoceno e incluyen cuñas criogénicas, involuciones del permafrost, horizontes edáficos desorganizados, distribución criogénica del material grueso y acumulación de materia orgánica sobre el permafrost. Una posterior edafogénesis asociada a un ambiente más cálido y húmedo se refleja en rellenos de grietas con humus negro, presencia de agregados de humus negro en profundidad, translocación vertical de materia orgánica y formación de revestimientos de arcilla. Finalmente, el clima actual es más cálido pero más árido y esto se refleja a través de humus fúlvico pardo y la formación de rasgos vérticos. Incluso en este último periodo cálido los rasgos vérticos formados por procesos de contracción y expansion coexisten con la congelación anual en profundidad de los suelos y el desarrollo de permafrost a una profundidad de ~300 cm.Esta investigação foi realizada na parte sudeste da Rússia, e os solos em causa formaram-se sobre materiais parentais argilosos em condições de clima continental extremo favorável à congelação dos níveis profundos do solo e à manutenção do permafrost. De acordo com as suas características morfológicas, micromorfológicas, físicas e químicas, os solos representam um complexo que inclui Phaeozems Vérticos Lúvicos (Argílicos e Túrbicos e Phaeozems Lúvicos

  11. Evaluating Ambient Displays in the Wild

    DEFF Research Database (Denmark)

    Messeter, Jörn; Molenaar, Daryn

    A prominent issue for evaluating ambient displays has been the conflict between the relative intrusiveness of evaluation methods and the intention to keep the display at the periphery of the user’s attention. There is a general lack of research discussing the difficulties of evaluating ambient...... displays in the wild, and in particular social aspects of use has received little attention. This paper presents a case study of an ambient light display designed for a public setting. Based on results from a non-intrusive in situ evaluation, we argue that viewing ambient displays as features of a broader...... social setting may aid our understanding of issues regarding the evaluation of ambient displays in the wild....

  12. Phytoplankton of the Swan-Canning Estuary: a comparison of nitrogen uptake by different bloom assemblages

    Science.gov (United States)

    Horner Rosser, S. M. J.; Thompson, Peter A.

    2001-09-01

    Spring chlorophyte-, summer dinophyte- and autumn cryptophyte-dominated phytoplankton blooms occurring in the upper reaches of the Swan-Canning Estuary have been studied to compare species composition and diurnal distribution and to determine preferential uptake rates for different nitrogen sources. Species distribution patterns over diurnal cycles showed dinophyte and cryptophyte species exhibiting diurnal vertical migration patterns which changed over a three-week bloom period. The dinophyte and cryptophyte behaviour appeared to be related to measured changes in ambient nitrogen profiles over the course of the bloom. Chlorophyte species were not shown to be strongly migratory over diurnal periods. Absolute uptake rates (, approximating Pmax) for nitrogen, in the form of 15NO3-, 15NH4+ or 15N-urea, were compared between seasonal bloom assemblages and ranged between 0·02 and 12 µg N l-1 h-1 (NO3 0·02-7; NH4 0·4-9; urea 0·1-12 µg N l-1Ambient NHambient NH

  13. Spatial distribution of living (Rose Bengal stained) benthic foraminifera in the Loire estuary (western France)

    Science.gov (United States)

    Mojtahid, M.; Geslin, E.; Coynel, A.; Gorse, L.; Vella, C.; Davranche, A.; Zozzolo, L.; Blanchet, L.; Bénéteau, E.; Maillet, G.

    2016-12-01

    Ninety-seven surface sediment samples were collected in September 2012 from intertidal and subtidal areas along the Loire estuary (western France). The main objective of this work is to study the spatial distributional patterns of living benthic foraminifera and their link to the environmental parameters (distance to sea, elevation, grain size, total organic carbon, trace metals, sedimentary carbonates, and polycyclic aromatic hydrocarbons) in the Loire estuary. Foraminiferal analysis was also extended to the dead assemblages in thirty-three surface samples from the lower inner estuary. The highest absolute densities of living benthic foraminifera are found in the lower inner estuary within the polyhaline domain. This is attributed to the presence of mudflats with abundant food source, i.e. microphytobenthos. The low densities found in the outer estuary (euhaline domain) are attributed partly to the sandy nature of the sediments and the food source inhabiting this substrate. The near absence of foraminifera in the inner estuary (mesohaline and polyhaline domains) is inferred to the physical disturbance resulting from the regular dredging of the navigation channel. The living assemblages are dominated by three typical estuarine species: Ammonia tepida and Haynesina germanica in the intertidal mudflats of the lower inner estuary and Cribroelphidium excavatum in the sandy subtidal sediments of the lower inner and outer estuary. In the Loire estuary, H. germanica has an unusual intermediate geographical distribution along the estuary between A. tepida and C. excavatum while in most temperate estuaries this species is present upstream in the mesohaline domain. This is most likely the result of the regular dredging of the navigation channel damaging its natural habitat. This might be also the explanation for the total absence of agglutinated species usually dominating the oligohaline domain. The canonical correspondence analysis shows that elevation (and its link to time

  14. EL RACISMO AMBIENTAL EN CHILE

    Directory of Open Access Journals (Sweden)

    MATÍAS MEZA-LOPEHANDÍA

    2011-06-01

    Full Text Available El problema de la desigualdad en Chile ha sido abordado desde diferentes puntos de vista como la cuestión de la distribución de la riqueza o el acceso a los derechos sociales. Es este trabajo se observa el mismo problema pero desde la perspectiva recientemente esbozada por los movimientos sociales: la del racismo ambiental o la desigual distribución de los deshechos del desarrollo y el consumo. De esta manera se revisan sucintamente los principales conflictos que han surgido en el último tiempo a lo largo del país entre empresas públicas y privadas y comunidades locales y originarias. Así mismo se examinan las formas de organización que estas últimas han asumido y el estado actual de articulación entre ellas. De la revisión de la situación se concluye que estamos ante el surgimiento de un actor de nuevo tipo, que surge de las contradicciones del Chile neoliberal y que se diferencia del movimiento ecologista por vincular sus reivindicaciones a la defensa del territorio y al derecho a la autodeterminación de los pueblos.

  15. Ambient clumsiness in virtual environments

    Science.gov (United States)

    Ruzanka, Silvia; Behar, Katherine

    2010-01-01

    A fundamental pursuit of Virtual Reality is the experience of a seamless connection between the user's body and actions within the simulation. Virtual worlds often mediate the relationship between the physical and virtual body through creating an idealized representation of the self in an idealized space. This paper argues that the very ubiquity of the medium of virtual environments, such as the massively popular Second Life, has now made them mundane, and that idealized representations are no longer appropriate. In our artwork we introduce the attribute of clumsiness to Second Life by creating and distributing scripts that cause users' avatars to exhibit unpredictable stumbling, tripping, and momentary poor coordination, thus subtly and unexpectedly intervening with, rather than amplifying, a user's intent. These behaviors are publicly distributed, and manifest only occasionally - rather than intentional, conscious actions, they are involuntary and ambient. We suggest that the physical human body is itself an imperfect interface, and that the continued blurring of distinctions between the physical body and virtual representations calls for the introduction of these mundane, clumsy elements.

  16. Sedimentology and ichnology of the fluvial reach to inner estuary of the Ogeechee River estuary, Georgia, USA

    Science.gov (United States)

    Shchepetkina, Alina; Gingras, Murray K.; Pemberton, S. George

    2016-08-01

    Through the integration of sedimentological and ichnological observations, this paper explores the character of sediments deposited across the fluvio-tidal transition zone of the upper microtidal, mixed-energy, sand-dominated Ogeechee River estuary, Georgia, USA. A transect of tidally influenced to fluvial channel-bars and their facies variability is reported. Field and laboratory methods were employed, including observation of physical and biogenic sedimentary structures on the point-bar surfaces and in trenches, collection of grab samples, suction and box coring, grain size and total organic carbon analyses, optical microscopy, core logging, and daylight photography. The data presented in the paper can help in predicting facies changes across the fluvio-tidal transition of sand-dominated fluvio-tidal deposits in the rock record. The lower inner estuary is characterized by medium-fine and fine-medium sand with planar and trough cross-bedding, small-scale ripple lamination, tidal sedimentary structures (flaser and wavy bedding, herringbone cross-stratification), abundant organic debris, and mud rip-up clasts. Bioturbation of the intertidal point bars is low, but cryptobioturbation is locally observed. Upper inner estuary deposits comprise coarse-medium- and medium-coarse-grained sand, and are characterized by faint high-angle planar and trough cross-bedding. Organic debris, mud rip-up clasts, herringbone and current-ripple lamination are rarely observed. Bioturbation is absent to sparse. The fluvio-tidal transition is represented by very-coarse- to coarse-grained sand and granules. Physical sedimentary structures constitute massive, graded planar and trough cross-bedding with abundant plant detritus. Except for rare Siphonichnus- and Lockeia-like traces, bioturbation is absent. The fluvial setting is characterized by coarse-medium sand with unidirectional cross-bedding, current-ripple lamination, and rare organic-rich mud clasts. Bioturbation is absent. Inner

  17. Macrobenthic communities of saltpans from the Sado estuary (Portugal)

    Science.gov (United States)

    Amaral, Maria José; Costa, Maria Helena

    1999-07-01

    A 1-year study on the evolution of benthic communities of saltpans from the Sado estuary was carried out in order to evaluate its density, biomass and diversity, and to understand its trophic-dynamic structure under harsh environmental conditions. Physical and chemical parameters of the water column and sediments were also studied. Salinity and redox potential fluctuated sharply. Of eighteen taxa observed, a few occurred in significant numbers Chironomus salinarius (99 %) at crystallisation ponds where Artemia is present in the water column at salinities ranging from 23 to 249 g .L -1, Hydrobia (95 %) at evaporation pond (salinities between 29 and 112 g .L -1), while the reservoir, with salinities from 22 to 45 g .L -1, showed higher diversity nevertheless lower than in the estuary itself. It is colonised all year by Abra ovata, Cerastoderma glaucum, Hedistes diversicolor, Capitella sp., Microspio mecznikowianus, Mellina palmata, Polydora ciliata, Capitellidae and Microdeutopus gryllotalpa. The diversity of macrobenthic communities decreases with increasing salinity. Among trophic dynamic groups, surface detritivores burrowers, which are present at 85 % of the samples, are the dominant group at evaporation and crystallisation ponds and appears as an isolated group linked to organic matter of sediments and nutrients.

  18. Mathematical simulation of sediment and radionuclide transport in estuaries

    Energy Technology Data Exchange (ETDEWEB)

    Onishi, Y.; Trent, D.S.

    1982-11-01

    The finite element model LFESCOT (Flow, Energy, Salinity, Sediment and Contaminant Transport Model) was synthesized under this study to simulate radionuclide transport in estuaries to obtain accurate radionuclide distributions which are affected by these factors: time variance, three-dimensional flow, temperature, salinity, and sediments. Because sediment transport and radionuclide adsorption/desorption depend strongly on sizes or types of sediments, FLESCOT simulates sediment and a sediment-sorbed radionuclide for the total of three sediment-size fractions (or sediment types) of both cohesive and noncohesive sediments. It also calculates changes of estuarine bed conditions, including bed elevation changes due to sediment erosion/deposition, and three-dimensional distributions of three bed sediment sizes and sediment-sorbed radionuclides within the bed. Although the model was synthesized for radionuclide transport, it is general enough to also handle other contaminants such as heavy metals, pesticides, or toxic chemicals. The model was checked for its capability for flow, water surface elevation change, salinity, sediment and radionuclide transport under various simple conditions first, confirming the general validity of the model's computational schemes. These tests also revealed that FLESCOT can use large aspect ratios of computational cells, which are necessary in handling long estuarine study areas. After these simple tests, FLESCOT was applied to the Hudson River estuary between Chelsea and the mouth of the river to examine how well the model can predict radionuclide transport through simulating tidally influenced three-dimensional flow, salinity, sediment and radionuclide movements with their interactions.

  19. Geospatial Habitat Analysis in Pacific Northwest Coastal Estuaries

    Energy Technology Data Exchange (ETDEWEB)

    Borde, Amy B.(BATTELLE (PACIFIC NW LAB)); Thom, Ronald M.(BATTELLE (PACIFIC NW LAB)); Rumrill, Steven (South Slough Estuarine Research Reserve); Miller, L M.(GEORGE A GRANT INC)

    2003-08-01

    We assessed historical changes in the location and amount of estuarine habitat in three of the four largest coastal estuaries in the Pacific Northwest (Grays Harbor, Willapa Bay, and Coos Bay) as part of the Pacific Northwest Coastal Ecosystem Regional Study (PNCERS). To accomplish this, navigation charts, hydrographic survey data, maps, and published descriptions were used to gain information on the location of the shoreline, bathymetry, and vegetated habitats, which was then digitized and subjected to geospatial analysis using a geographic information system. In addition, we used present-day elevational boundaries for marshes, flats, and eelgrass meadows to help define habitat areas where they were not indicated on historical maps. The analysis showed that tidal flats have decreased in all study areas; potential eelgrass habitat has increased in Grays Harbor and Willapa Bay and decreased slightly in Coos Bay; tidal wetland area has declined in all three coastal estuaries, with increases in localized areas due to filling and sedimentation; and dramatic changes have occurred at the mouths of Grays Harbor and Willapa Bay. As has been shown before, these data illustrate that direct physical alteration (filling and diking) has resulted in large changes to habitats. However, indirect impacts from forest practices in the watershed, as well as variation in climatic factors and oceanographic processes, may also have contributed to changes. The information provides more evidence for managing estuarine habitats in the region and a employing a historical template to plan habitat restoration in the future.

  20. Modeling Residual Circulation and Stratification in Oujiang River Estuary

    Institute of Scientific and Technical Information of China (English)

    LIN Wei-bo; WANG Yi-gang; RUAN Xiao-hong; XU Qun

    2012-01-01

    A 3D,time-dependent,baroclinic,hydrodynamic and salinity model was implemented and applied to the Oujiang River estuarine system in the East China Sea.The model was driven by the forcing of tidal elevations along the open boundaries and freshwater inflows from the Oujiang River.The bottom friction coefficient and vertical eddy viscosity were adjusted to complete model calibration and verification in simulations.It is demonstrated that the model is capable of reproducing observed temporal variability in the water surface elevation and longitudinal velocity,presenting skill coefficient higher than 0.82.This model was then used to investigate the influence of freshwater discharge on residual current and salinity intrusion under different freshwater inflow conditions in the Oujiang River estuary.The model results reveal that the river channel presents a two-layer structure with flood currents near the bottom and ebb currents at the top layer in the region of seawater influenced on north shore under high river flow condition.The river discharge is a major factor affecting the salinity stratification in the estuarine system.The water exchange is mainly driven by the tidal forcing at the estuary mouth,except under high river flow conditions when the freshwater extends its influence from the river's head to its mouth.

  1. Pollutant Flux Estimation in an Estuary Comparison between Model and Field Measurements

    Directory of Open Access Journals (Sweden)

    Yen-Chang Chen

    2014-08-01

    Full Text Available This study proposes a framework for estimating pollutant flux in an estuary. An efficient method is applied to estimate the flux of pollutants in an estuary. A gauging station network in the Danshui River estuary is established to measure the data of water quality and discharge based on the efficient method. A boat mounted with an acoustic Doppler profiler (ADP traverses the river along a preselected path that is normal to the streamflow to measure the velocities, water depths and water quality for calculating pollutant flux. To know the characteristics of the estuary and to provide the basis for the pollutant flux estimation model, data of complete tidal cycles is collected. The discharge estimation model applies the maximum velocity and water level to estimate mean velocity and cross-sectional area, respectively. Thus, the pollutant flux of the estuary can be easily computed as the product of the mean velocity, cross-sectional area and pollutant concentration. The good agreement between the observed and estimated pollutant flux of the Danshui River estuary shows that the pollutant measured by the conventional and the efficient methods are not fundamentally different. The proposed method is cost-effective and reliable. It can be used to estimate pollutant flux in an estuary accurately and efficiently.

  2. Estimation of total suspended matter in the Zhujiang (Pearl)River estuary from Hyperion imagery

    Institute of Scientific and Technical Information of China (English)

    LIU Dazhao; FU Dongyang; XU Bing; SHEN Chunyan

    2012-01-01

    Although remote sensing data have been used to estimate total suspended matter (TSM) in coastal waters,it has limitations when applied to estuary waters in low spatial resolution situations.The spatial resolution of ocean color satellites such as SeaWiFS and MODIS is usually ~1 km,and therefore is not adequate for small,local-scale areas such as the Zhujiang (Pearl) River estuary.In contrast,30 m-resolution EO-1 Hyperion imagery has potential for studying TSM in localized areas.We measured the surface spectral radiance reflectance of the river estuary water in the visible and near infra-red spectral range.Sensitivity analysis indicated that the ratio of remote sensing reflectance at 813 nm (Rrs(813)) to reflectance at 559 nm (Rrs(559)) could be used to estimate TSM concentration,and a linear relationship was established between the ratio and in-situ TSM concentration.We applied the linear relationship to Hyperion imagery to map TSM concentration in the estuary.The Hyperion imagery provided sufficient spatial resolution to detect spatiotemporal changes in TSM concentrations in the estuary small estuary area.This study demonstrated the usefulness of Hyperion imagery for mapping the distribution of TSM in estuary waters.

  3. Temporal and spatial changes of suspended sediment concentration and resuspension in the Yangtze River estuary

    Institute of Scientific and Technical Information of China (English)

    CHENShenliang; ZHANGGuoan; YANGShilun

    2003-01-01

    A detailed analysis of suspended sediment concentration (SSC) variations over a year period is presented using the data from 8 stations in the Yangtze River estuary and its adjacent waters, together with a discussion of the hydrodynamic regimes of the estuary. Spatially, the SSC from Xuliujing downwards to Hangzhou Bay increases almost constantly, and the suspended sediment in the inner estuary shows higher concentration in summer than in winter, while in the outer estuary it shows higher concentration in winter than in summer, and the magnitude is greater in the outer estuary than in the inner estuary, greater in the Hangzhou Bay than in the Yangtze River estuary. The sediments discharged by the Yangtze River into the sea are resuspended by marine dynamics included tidal currents and wind waves. Temporally, the SSC shows a pronounced neap-spring tidal cycle and seasonal variations. Furthermore, through the analysis of dynamic mechanism, it is concluded that wave and tidal current are two predominant factors of sediment resuspension and control the distribution and changes of SSC, in which tidal currents control neap-spring tidal cycles, and wind waves control seasonal variations. The ratio between river discharge and marine dynamics controls soatial distribution of SSC.

  4. Carbon budgets for two Portuguese estuaries: implications for the management and conservation of coastal waters

    Directory of Open Access Journals (Sweden)

    Ana P. Oliveira

    2014-07-01

    The results presented illustrate that Tagus and Sado estuaries represent an important land/ocean boundary for carbon transformation and emission, and confirm the anthropogenic pressure that these estuaries are subject to. Carbon budgets vary markedly within and between these two estuaries reflecting the human pressure. Anthropogenic inputs, autochthonous carbon production and primary production are indicated as the main responsible for the carbon production within the estuaries. Both estuaries export carbon to the ocean and to the atmosphere. The inorganic carbon faction has a major role in the carbon budget, enriching the ocean in carbon dioxide, contributing this for the greenhouse effect. Our understanding of organic and inorganic carbon fluxes in Tagus and Sado estuaries is vital for an efficient protection and preservation of such ecosystems being helpful in limit human-caused damage and in restoring damaged estuarine/coastal ecosystems. In addition, the economic impact of the carbon fluxes to the atmosphere, estimated as €375,000 per year, creates the appropriate incentives to reduce emissions and shift them to higher-value uses. Suggesting, therefore, a coastal management re-oriented towards a more adaptive approach through the use of carbon market-based policies. This study is a contribution to the integration of coastal and global carbon cycles. However, additional efforts are required to fully merge other components subsystems, such as salt marshes, with these budgets. Moreover, a fully comprehension of the community metabolism in these estuaries will greatly improve this integration.

  5. Calidad ambiental interior: bienestar, confort y salud

    Directory of Open Access Journals (Sweden)

    Francisco Vargas Marcos

    2005-01-01

    Full Text Available Distintas formas de interpretar las condiciones ambientales han llevado al desarrollo de conceptos tales como edificio enfermo, calidad del aire o calidad ambiental interior, todos ellos encaminados a entender la complejidad de los contaminantes en los ambientes cerrados y las implicaciones sobre la salud de la población. La propuesta de "Calidad ambiental interior" es un avance conceptual y operativo que supera ampliamente a los anteriores, puesto que orienta las acciones hacia ambientes saludables sin limitar al aire la idea de contaminación. El objetivo del trabajo es identificar las competencias y el marco legislativo que permiten actuar en la prevención de riesgos asociados a la exposición de contaminantes en ambientes interiores. Óptimas condiciones en los ambientes interiores deben redundar en salud, bienestar y confort, tanto en lo que respecta a la vida laboral como a los ámbitos donde se desarrollan las actividades cotidianas extralaborales, escolares, de descanso y de ocio. La sociedad actual exige lugares seguros, limpios y bien climatizados, para lo que es necesario integrar percepciones y exigencias de los habitantes y alcanzar un óptimo equilibrio entre estándares sociales, uso de la energía y desarrollo sostenible, buscando confort sin contaminar y sin aumentar el consumo de fuentes energéticas que degraden el medio ambiente. El desarrollo legislativo se orienta a la seguridad y la salud en los lugares de trabajo y la regulación de las sustancias químicas. La Sanidad Ambiental lleva a cabo tareas de prevención y control, participa en la ejecución de convenios internacionales de reducción de contaminantes y desechos y promueve acciones para el desarrollo de la Estrategia Europea de Salud y Medio Ambiente.

  6. Context Dependent Analysis of BioAmbients

    DEFF Research Database (Denmark)

    Pilegaard, Henrik; Nielson, Flemming; Nielson, Hanne Riis

    2006-01-01

    BioAmbients is a derivative of mobile ambients that has shown promise of describing interesting features of the behaviour of biological systems. The technical contribution of this paper is to extend the Flow Logic approach to static analysis with a couple of new techniques in order to give precise...... information about the behaviour of systems written in BioAmbients. Applying the development to a simple model of a cell releasing nutrients from food compunds we illustrate how the proposed analysis does indeed improve on previous efforts....

  7. MUVA: a MUltimodal Visceral design Ambient device

    DEFF Research Database (Denmark)

    Kivac, Robert; Klem, Sune Øllgaard; Olsen, Sophus Béneé

    2016-01-01

    This paper presents MUVA (MUltimodal Visceral design Ambient device), a prototype for a storytelling light- and sound-based ambient device. The aim of this device is to encourage social interaction and expand the emotional closeness in families with children where at least one parent has irregular...... work schedule. MUVA differs from the other ambient devices, because it is targeted to children, and it adopts a visceral design approach in order to be appealing to its users. It is a raindrop-shaped lamp, which features audio playing, while its light color is affected by the audio playing. MUVA can...

  8. Migration dynamics of clupeoids in the Schelde estuary: a stable isotope approach

    DEFF Research Database (Denmark)

    Guelinckx, J.; Maes, J.; De Brabandere, Loreto

    2006-01-01

    using C and N stable isotopes. Prior to this,  stomach contents were used to verify the isotopic differences between the food sources at the sampling stations. From May 2000 to April 2001 fish were collected monthly in the upper and lower estuary. Muscle tissue and stomach contents were analyzed for d13...... movement in the Schelde estuary. Seasonal movements of clupeoids in the Schelde estuary were analyzed by separating the temporal abundance patterns into migration groups based on their muscle isotopic composition. Immigration and emigration seem to occur continuously throughout the year. Most exchange...

  9. Modelling nitrogen and phosphorus cycles and dissolved oxygen in the Zhujiang Estuary Ⅱ. Model results

    Institute of Scientific and Technical Information of China (English)

    Guan Weibing; Wong Lai-Ah; Xu Dongfeng

    2001-01-01

    In the present study, the ecosystem-based water quality model was applied to the Pearl River (Zhujiang) Estuary. The model results successfully represent the distribution trend of nutrients and dissolved oxygen both in the horizontal and vertical planes during the flood season, and it shows that the model has taken into consideration the key part of the dynamical, chemical and biological processes existing in the Zhujiang Estuary. The further studies illustrate that nitrogen is in plenty while phosphorus and light limit the phytoplankton biomass in the Zhujiang Estuary during the flood season.

  10. Trace metal partitioning over a tidal cycle in an estuary affected by acid mine drainage (Tinto estuary, SW Spain)

    Energy Technology Data Exchange (ETDEWEB)

    Hierro, A. [Department of Physics, Universitat Autònoma de Barcelona, 08193 Bellaterra (Spain); Department of Applied Physics, Facultad de Ciencias Experimentales, University of Huelva, Campus de El Carmen, Campus de Excelencia Internacional del Mar CEIMAR, 21071 Huelva (Spain); Olías, M., E-mail: manuel.olias@dgyp.uhu.es [Department of Geodynamics and Paleontology, Facultad de Ciencias Experimentales, University of Huelva, Campus de El Carmen, Campus de Excelencia Internacional del Mar CEIMAR, 21071 Huelva (Spain); Cánovas, C.R. [Department of Geodynamics and Paleontology, Facultad de Ciencias Experimentales, University of Huelva, Campus de El Carmen, Campus de Excelencia Internacional del Mar CEIMAR, 21071 Huelva (Spain); Martín, J.E.; Bolivar, J.P. [Department of Applied Physics, Facultad de Ciencias Experimentales, University of Huelva, Campus de El Carmen, Campus de Excelencia Internacional del Mar CEIMAR, 21071 Huelva (Spain)

    2014-11-01

    The Tinto River estuary is highly polluted with the acid lixiviates from old sulphide mines. In this work the behaviour of dissolved and particulate trace metals under strong chemical gradients during a tidal cycle is studied. The pH values range from 4.4 with low tide to 6.9 with high tide. Precipitation of Fe and Al is intense during rising tides and As and Pb are almost exclusively found in the particulate matter (PM). Sorption processes are very important in controlling the mobility (and hence bioavailability) of some metals and particularly affect Cu below pH 6. Above pH ∼ 6 Cu is desorbed, probably by the formation of Cu(I)–chloride complexes. Although less pronounced than Cu, also Zn desorption above pH 6.5 seems to occur. Mn and Co are affected by sorption processes at pH higher than ca. 6. Cd behaves conservatively and Ni is slightly affected by sorption processes. - Highlights: • The Tinto estuary shows strong pH gradients and high trace elements concentrations. • PM has a hysteretic relationship with tides and high contents of Fe, Al, As and Pb. • Co and Mn are controlled by river and sea water mixing and sorption processes. • Sorption processes strongly affect Cu below pH 6, above this value Cu is desorpted. • Cadmium behaves conservatively along the pH range studied (4.4–6.9)

  11. Economía y medio ambiente

    Directory of Open Access Journals (Sweden)

    Ciro Alfonso Serna Mendoza

    2010-12-01

    Full Text Available En ciertos escenarios académicos, políticos, sociales y ambientales se declara que el modelo económico dominante o los conceptos que lo integran son responsables de que el bienestar económico implique malestar ecológico.Al partir de este supuesto, una forma de comprender las causas y de contribuir a la solución de la problemática ambiental es develar en qué consisten, en qué términos plantean la relación ombre-medio ambiente, las propuestas que incluyen la dimensión ambiental en el campo de la economía. Y si, al igual que las teorías ambientales, acuden a la ética como factor adecuado para disminuir las externalidades negativas generadas en el ambiente por la actividad económica.

  12. 2011 NATA - Risks and Annual Ambient Concentrations

    Data.gov (United States)

    U.S. Environmental Protection Agency — This dataset includes the modeled annual ambient concentrations and risks at the census tract level for the 2011 National Air Toxics Assessment. All concentrations...

  13. Modelling of tidal hydrodynamics for a tropical ecosystem with implications for pollutant dispersion (Cohin Estuary, Southwest India)

    Science.gov (United States)

    Balachandran, Kizhakkepat Kalathil; Reddy, Guddemmari Sidha; Revichandran, Chenicherry; Srinivas, Kotamarpi; Vijayan, Panachikkal Ramakrishnan; Thottam, Tony Joseph

    2008-11-01

    Tidal circulation in the Cochin Estuary, a moderately polluted estuary along the southwest coast of India, was studied using a 2D hydrodynamic model. The predicted tides and currents showed very good agreement with measured tides. Particle trajectories and residual currents computed from the model have been used to classify the study region into three zones: northern estuary, central estuary, and southern estuary. The central estuary is dynamic, whereas the other two zones are relatively weak. An amplification of measured tides in the south estuary during March indicates the presence of standing waves caused by the hydraulic barrier at Thanneermukkom. Model results suggest that the northern and southern zones are sensitive to environmental pollution. The present level of pollution in the northern estuary is due to the direct release of industrial effluents into the river Periyar, which can be minimized if they are brought down to central estuary for disposal. The concept of different zones in the estuary will be useful to planners in protecting the vulnerable regions of this productive ecosystem from human interventions.

  14. Survey of Morphological Changes on Tidal Flats in Estuaries

    Science.gov (United States)

    Albers, Thorsten; von Lieberman, Nicole

    2010-05-01

    Tidal flat areas in estuaries are affected by strong morphodynamics. Changes of sedimentation and erosion occur on very different time and spatial scales. These changes challenge the responsible authorities due to the high importance of sufficient navigation channel depths and the ecological importance of those unique zones. The Hamburg University of Technology in cooperation with the Hamburg Port Authority runs broad field measurements on different tidal flat areas in the Elbe estuary. The results provide a fundamental data set, which improves the knowledge about morphodynamic processes and verifies mathematical descriptions. The field measurements focus on two investigation areas: One area is located in the mouth of the estuary and represents a marine tidal flat. The other one is located near the city of Hamburg and typifies a limnic tidal flat area. For more than 3 years water levels, waves, current parameters and suspended sediment concentrations are being recorded continuously and in a high resolution at different positions. Altogether, three measuring positions are operated at any time. To observe the consequences of the morphodynamic processes, the bathymetry of the investigation areas is determined with a multi-beam echo sounder (MBES) in frequent intervals. The main goal of the research project is to improve the knowledge about morphodynamic processes on tidal flats. Derived from the field data certain patterns of erosion, sediment transport and sedimentation could be observed depending on tidal currents, waves and large scale weather conditions. Seasonal effects are analysed as well as the influence of extreme events. A comparison of the processes observed on marine and limnic areas is done, whereas the latter additionally is affected by upstream water discharge. For example, on the marine tidal flats the sediment transport capacity was analysed: Extreme events cause a short peak, which does not result in significant bathymetric changes. Larger

  15. A Smart Kitchen for Ambient Assisted Living

    OpenAIRE

    Rubén Blasco; Álvaro Marco; Roberto Casas; Diego Cirujano; Richard Picking

    2014-01-01

    The kitchen environment is one of the scenarios in the home where users can benefit from Ambient Assisted Living (AAL) applications. Moreover, it is the place where old people suffer from most domestic injuries. This paper presents a novel design, implementation and assessment of a Smart Kitchen which provides Ambient Assisted Living services; a smart environment that increases elderly and disabled people’s autonomy in their kitchen-related activities through context and user awareness, appr...

  16. Ambient air pollution and low birthweight

    DEFF Research Database (Denmark)

    Pedersen, Marie; Giorgis-Allemand, Lise; Bernard, Claire

    2013-01-01

    BACKGROUND: Ambient air pollution has been associated with restricted fetal growth, which is linked with adverse respiratory health in childhood. We assessed the effect of maternal exposure to low concentrations of ambient air pollution on birthweight. METHODS: We pooled data from 14 population...... air pollutants and traffic during pregnancy is associated with restricted fetal growth. A substantial proportion of cases of low birthweight at term could be prevented in Europe if urban air pollution was reduced. FUNDING: The European Union....

  17. Identificación de rasgos morfológicos para una rápida diferenciación de sardina austral (Sprattus fuegensis y sardina común (Strangomera bentincki

    Directory of Open Access Journals (Sweden)

    Antonio Aranis

    2014-11-01

    Full Text Available La pesquería artesanal de cerco multiespecífica que opera en aguas interiores de Chiloé captura sardina común (Strangomera bentincki y sardina austral (Sprattus fuegensis al mismo tiempo y en la misma área. Debido a la gran similitud morfológica externa que presentan estas dos especies de peces óseos, la identificación específica en terreno es difícil, aún para observadores científicos experimentados. Por lo tanto, el objetivo de este trabajo es proponer cual o cuales rasgos morfométricos externos debiesen ser considerados para una rápida identificación de estas especies en terreno. Se analizaron 60 ejemplares de sardina común y 79 de sardina austral. Se identificaron los ejemplares a nivel de especie y se registraron las siguientes medidas: longitud total, longitud de la cabeza, preórbita, órbita y posórbita. Todas las medidas morfométricas fueron estandarizadas para evitar colinealidad. Las diferencias en las medidas morfométricas entre especies fueron probadas mediante métodos estadísticos multivariados que incluyen el análisis de componentes principales, análisis de varianza y covarianza (ANOVA y ANCOVA, análisis multivariado de covarianza (MANOVA y análisis lineal discriminante. La medida posórbita fue el rasgo morfométrico que presentó mayor diferenciación entre especies. Se concluye que la medida de posórbita es por sí sola un carácter morfométrico externo que permitiría una rápida identificación de estas especies en terreno. Los resultados de esta investigación pueden ser tomados como línea base para la generación de guías de campo que apoyen el trabajo de identificación de especies de los observadores científicos.

  18. Ambient ionization mass spectrometry: A tutorial

    Energy Technology Data Exchange (ETDEWEB)

    Huang, Min-Zong; Cheng, Sy-Chi; Cho, Yi-Tzu [Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan (China); Shiea, Jentaie, E-mail: jetea@fac.nsysu.edu.tw [Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan (China); Cancer Center, Kaohsiung Medical University, Kaohsiung, Taiwan (China)

    2011-09-19

    Highlights: {yields} Ambient ionization technique allows the direct analysis of sample surfaces with little or no sample pretreatment. {yields} We sort ambient ionization techniques into three main analytical strategies, direct ionization, direct desorption/ionization, and two-step ionization. {yields} The underlying principles of operation, ionization processes, detecting mass ranges, sensitivity, and representative applications of these techniques are described and compared. - Abstract: Ambient ionization is a set of mass spectrometric ionization techniques performed under ambient conditions that allows the direct analysis of sample surfaces with little or no sample pretreatment. Using combinations of different types of sample introduction systems and ionization methods, several novel techniques have been developed over the last few years with many applications (e.g., food safety screening; detection of pharmaceuticals and drug abuse; monitoring of environmental pollutants; detection of explosives for antiterrorism and forensics; characterization of biological compounds for proteomics and metabolomics; molecular imaging analysis; and monitoring chemical and biochemical reactions). Electrospray ionization and atmospheric pressure chemical ionization are the two main ionization principles most commonly used in ambient ionization mass spectrometry. This tutorial paper provides a review of the publications related to ambient ionization techniques. We describe and compare the underlying principles of operation, ionization processes, detecting mass ranges, sensitivity, and representative applications of these techniques.

  19. Distribution and composition characteristics of heavy minerals in surficial sediment of Minjiang Estuary

    Institute of Scientific and Technical Information of China (English)

    XU Maoquan; XU Wenbin; SUN Meiqin

    2005-01-01

    Heavy minerals with a size range of 0.125~0.250 mm in the surficial sediment of Minjiang Estuary are studied. Thirty-four heavy minerals have been identified, with an average content of 1.92%. Major minerals include magnetite, epidote, hematite, hornblende, ilmenite, and zircon mica. These types are the same as those in the 0.063~0.125 mm range; however, the average content is lower, which reveals that the heavy minerals in Minjiang Estuary are mainly enriched in the very-fine sand fraction. According to the content and distribution characteristics of the major heavy minerals, Minjiang Estuary can be divided into 4 mineral assemblage zones. In each zone the assemblage of heavy minerals is greatly affected by the hydrodynamic condition and the sedimentary environment. Heavy mineral types also show that detrital matters in Minjiang Estuary are originated from the weathering and erosion of the bedrock in the Minjiang River drainage area.

  20. CREEK Project's Oyster Biomass Database for Eight Creeks in the North Inlet Estuary, South Carolina

    Data.gov (United States)

    Baruch Institute for Marine and Coastal Sciences, Univ of South Carolina — A group of eight tidal creeks dominated by oysters, Crassostrea virginica, in North Inlet Estuary, South Carolina, USA were studied using a replicated BACI (Before -...

  1. Geospatial analysis of long-term morphological changes in Cochin estuary, SW coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    DineshKumar, P.K.; Gopinath, G.; Manimurali, R.; Muraleedharan, K.R.

    The Cochin estuary along the SW coast of India has undergone tremendous environmental changes due to continuous alterations. Geospatial information available since 1967 has been compiled to evaluate the long-term morphological changes...

  2. National Status and Trends: Bioeffects Assessment Program, St Lucie Estuary Summary Database (2001-2004)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The foundation of this study was based on a sediment quality triad (SQT) approach with a probabilistic sampling design, which characterized the estuary in terms of...

  3. Dissolved organic matter (DOM) export to a temperate estuary: Seasonal variations and implications of land use

    DEFF Research Database (Denmark)

    Stedmon, C. A.; Markager, S.; Søndergaard, M.;

    2006-01-01

    nutrient inputs to the estuary, dissolved inorganic nitrogen (DIN) and dissolved organic phosphorus dominated the loadings. Although 81% of the nitrogen annually supplied to the estuary was DIN, 83% of the nitrogen exported from the estuary was dissolved organic nitrogen (DON). Results show that increasing......, and the percentage of catchment area used for agriculture. Colored DOM (CDOM) loading measurements were found to be a good predictor of dissolved organic carbon (DOC) loading across the different subcatchments, offering a rapid and inexpensive alternative of operationally monitoring DOC export. For all the dissolved...... the area of the catchment covered by forest and natural pastures would have a positive effect on the trophic status of the estuary, leading to a considerable decrease in the phosphorus loading and a shift in the nitrogen loading from DIN to DON. Such a change in land use would also increase the export...

  4. Studies on organic carbon, nitrogen and phosphorous in the sediments of Mandovi Estuary, Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Nasnolkar, C.M.; Shirodkar, P.V.; Singbal, S.Y.S.

    Sediment organic carbon, total nitrogen, total phosphorous and hydrography of the overlying waters of the estuarine region in Mandovi Estuary, Goa, India have been studied. The relationship of carbon and nutrients with sediment characteristics...

  5. Attributes of Successful Actions to Restore Lakes and Estuaries Degraded by Nutrient Pollution-

    Science.gov (United States)

    As more success is achieved in restoring lakes and estuaries from the impacts of nutrient pollution, there is increased opportunity to evaluate the scientific, social, and policy factors associated with achieving restoration goals. We examined case studies where deliberate action...

  6. Attributes of Successful Actions to Restore Lakes and Estuaries Degraded by Nutrient Pollution

    Science.gov (United States)

    As more success is achieved restoring lakes and estuaries from nutrient pollution, there is increased opportunity to evaluate the scientific, social, and policy factors associated with achieving restoration goals. We examined case studies where deliberate actions to reduce nutri...

  7. Freshwater flushing time scales of the Vashishti Estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    DineshKumar, P.K.; Sarma, R.V.; Zingde, M.D.

    Results are presented for the Vashishti estuary, Kerala, India to evaluate its freshwater flushing time scales based on 8 sets of observations of longitudinal salinity distributions. The results of the flushing time using the fraction of freshwater...

  8. Speciation and behaviour of Cd, Pb and Cu in Zuari Estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    George, M.D.

    the premonsoon season (February-May). Results of experiments conducted to evaluate the importance of desorption/dissolution revealed that the metal input due to desorption and dissolution of the particulate phase may not be very significant in the estuary...

  9. Recovery of an estuary in the southwest coast of India from tsunami impacts

    Digital Repository Service at National Institute of Oceanography (India)

    Laluraj, C.M.; Kesavadas, V.; Balachandran, K.K.; Gerson, V.J.; Martin, G.D.; Shaiju, P.; Revichandran, C.; Joseph, T.; Nair, M.

    Water quality in the Cochin Estuary, southwest coast of India during the tsunami attack was assessed and compared with the pre and post tsunami characteristics. From the results obtained, it is evident that a drastic change in hydrography has been...

  10. San Francisco Estuary Midwinter Waterfowl Survey: 2012 Survey Results and Trend Analysis (1981-2012)

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report provides results of the 2012 San Francisco Estuary Midwinter Waterfowl Survey and presents an analysis of trends in waterfowl counts from 1981-2012. The...

  11. Tides in the Mandovi and Zuari estuaries, Goa, west coast of India

    Indian Academy of Sciences (India)

    D Sundar; S R Shetye

    2005-10-01

    Mandovi and Zuari are two estuaries located in Goa,west coast of India.Variation of water level in the estuaries was monitored for a month at 13 locations using tide-poles during March –April 2003.Analysis of this data has provided for the first time,characteristics of how tidal constituents vary in the narrow and shallow estuaries,typical of those found along the west coast of India.At a distance of 45 km from the mouth the tidal range increased in both estuaries by approximately 20%.The tidal range at the upstream end of the two channels at the stations dropped sharply because of the increase in elevation of the channels.

  12. The Rising Tide of Estuary English: The Changing Nature of Oral British Business Communication.

    Science.gov (United States)

    Scott, James Calvert

    1995-01-01

    Defines "Estuary English," a fast-growing accent of British English that is spreading across England. Discusses its usage in the British business community; its acceptability and future; and its implications for business communicators, teachers, and consultants. (SR)

  13. VISION, STRATEGY AND ACTION PLAN FOR SHELLFISH FARMING DEVELOPMENT IN THE KRKA RIVER ESTUARY

    Directory of Open Access Journals (Sweden)

    Drago Maguš

    2009-10-01

    Full Text Available In this paper are presented the vision, strategic guidelines/measures and the action plan for shellfish farming development in the Krka river estuary. They came as a result from several discussions that were held with shellfish farmers of the estuary area in year 2008 while writing the Integrated Plan for Shellfish Farming for Krka Estuary Area, which was realized in the framework of the Green Business Support Programme (UNDP COST Project — Conservation, and Sustainable Use of Biodiversity in the Dalmatian Coast through Greening Coastal Development. For a short–term, a considerable impetus for the development of shellfish farming in the Krka river estuary could be the construction of common distribution and purification center, building of warehouse for shellfish farming equipment, and providing work space for the preparation of the equipment as well as the space for waste disposal; for a long–term it could be building of shellfish hatchery at the location of Martinska marine station.

  14. Modeling transportation of suspended solids in Zhujiang River estuary, South China

    Institute of Scientific and Technical Information of China (English)

    CHEN Xiaohong; CHEN Yongqin; LAI Guoyou

    2005-01-01

    A three-dimensional transportation model for suspended solids (SS) in Zhujiang (Pearl) River estuary, South China, was developed by coupling with a three-dimensional hydrodynamic model. The model was validated using hourly measured data of sediment contents during 25-26, July 1999. The results showed that modeled contents matched well with measured ones and that the modeled top layer distribution agreed with the remotely sensed image of suspended solids in summer. The modeled results showed clearly the layers of suspended solids in depth, with larger sediment contents in lower layers though in the interface between salt water and freshwater the lowest contents appeared in middle layer. In overall, the suspended solids inflow from 8 rivers, transport southwestward, and carried by strong coastal flow in Zhujiang River estuary. Contours of sediment contents in the estuary spread further to the open sea during ebb tide rather than flood tide which reflects that the suspended solids in the estuary are land sourced.

  15. Bacterial growth efficiency in a tropical estuary: Seasonal variability subsidized by allochthonous carbon

    Digital Repository Service at National Institute of Oceanography (India)

    Ram, A.S.P.; Nair, S.; Chandramohan, D.

    Bacterial growth efficiency (BGE) is a key factor in understanding bacterial influence on carbon flow in aquatic ecosystems. Intra-annual variability in BGE, and bacteria-mediated carbon flow in the tropical Mandovi and Zuari estuaries (southwest...

  16. Variations in phytoplankton community in a monsoon-influenced tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Patil, J.S.; Anil, A.C.

    In a monsoon-affected tropical estuary, oscillations in freshwater discharge during monsoon shifted the phytoplankton blooms from those adapted to low salinity to high salinity and vice versa. Salinity stratification during monsoon (onset...

  17. Salinity response to seasonal runoff in a complex estuarine system (Cochin estuary, west coast of India)

    Digital Repository Service at National Institute of Oceanography (India)

    Vinita, J.; Shivaprasad, A.; Revichandran, C.; Manoj, N.T.; Muraleedharan, K.R.; Jacob B

    during the dry season. During high runoff months (June–September) and moderate runoff months (October– December and May), the salinity structure is a strong function of variations in river runoff, and the estuary responds coherently to episodic inputs...

  18. Fresh water influence on nutrient stoichiometry in a tropical estuary, Southwest coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Martin, G.D.; Vijay, J.G.; Laluraj, C.M.; Madhu, N.V.; Joseph, T.; Nair, M.; Gupta, G.V.M.; Balachandran, K.K.

    Cochin backwaters, a micro tidal estuary, undergo a characteristic transformation from a river dominated system during summer monsoon to a tide-dominant system during pre-monsoon season. The present study observes that as the river flow weakens...

  19. Selected Pharmaceuticals Entering an Estuary: Concentrations, Temporal Trends, Partitioning and Fluxes

    Science.gov (United States)

    In many coastal watersheds and ecosystems, rivers discharging to estuaries receive waters from domestic wastewater-treatment plants resulting in the release and distribution of pharmaceuticals to the marine environment. In the present study, 15 active pharmaceutical ingredients w...

  20. Distribution and sources of particulate organic matter in the Indian monsoonal estuaries during monsoon

    Digital Repository Service at National Institute of Oceanography (India)

    Sarma, V.V.S.S.; Krishna, M.S.; Prasad, V.R.; Kumar, B.S.K.; Naidu, S.A.; Rao, G.D.; Viswanadham, R.; Sridevi, T.; Kumar, P.P.; Reddy, N.P.C.

    The distribution and sources of particulate organic carbon (POC) and nitrogen (PN) in 27 Indian estuaries were examined during the monsoon using the content and isotopic composition of carbon and nitrogen. Higher phytoplankton biomass was noticed...

  1. Sources, distribution and preservation of organic matter in a tropical estuary (Godavari, India)

    Digital Repository Service at National Institute of Oceanography (India)

    Krishna, M.S.; Naidu, S.A.; Subbaiah, Ch.V.; Gawade, L.; Sarma, V.V.S.S.; Reddy, N.P.C.

    Major sources and distribution of organic matter (OM) were examined in a tropical monsoonal estuary, the Godavari, using content and isotopic signatures in suspended particulate matter and surface sediments during no-discharge period. The lower (<10...

  2. Heterotrophic utilization of extracellular products of phytoplankton in a tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Gomes, H.; Pant, A; Goes, J.I.; Parulekar, A

    Bacterial uptake of algal exudates has been estimated in a tropical estuary, Dona Paula, Goa, India, where the seasonal fluctuations in hydrographic and nutrient parameters as well as dissolved organic matter concentrations and phytoplankton species...

  3. Dynamics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of Cochin estuary, India

    Digital Repository Service at National Institute of Oceanography (India)

    Ramzi, A; Rahman, K.H.; Gireeshkumar, T.R.; Balachandran, K.K.; Jacob, C.; Chandramohanakumar, N

    Polycyclic aromatic hydrocarbons (PAHs) showed significant seasonal dynamics in surface sediments of a tropical ecosystem (Cochin estuary, south west coast of India). Concentrations ranged from 304 to 5874 ngg-1 in pre-monsoon, 493 to 14...

  4. Transport of dissolved nutrients and chlorophyll a in a tropical estuary, southwest coast of India.

    Digital Repository Service at National Institute of Oceanography (India)

    Lallu, K.R.; Fausia, K.H.; Vinita, J.; Balachandran, K.K.; NaveenKumar, K.R.; Rehitha, T.V.

    Intra-tidal variability in the transport of materials through the Cochin estuary was studied over successive spring and neap tides to estimate the export fluxes of nutrients and chlorophyll a into the adjoining coastal zone. The results showed...

  5. Drivers of Variability of Diel-Cycling and Episodic Hypoxia In Northern Gulf of Mexico Estuaries

    Science.gov (United States)

    Eutrophication of coastal ecosystems is a longstanding environmental concern, exacerbated by population growth and associated nutrient pollution, and ultimately resulting in increased incidence of hypoxia. Shallow and highly productive estuaries and embayments are particularly su...

  6. From headwaters to coast: influence of human activities on water quality of the Potomac River Estuary

    Science.gov (United States)

    Bricker, Suzanne B.; Rice, Karen C.; Bricker, Owen P.

    2014-01-01

    The natural aging process of Chesapeake Bay and its tributary estuaries has been accelerated by human activities around the shoreline and within the watershed, increasing sediment and nutrient loads delivered to the bay. Riverine nutrients cause algal growth in the bay leading to reductions in light penetration with consequent declines in sea grass growth, smothering of bottom-dwelling organisms, and decreases in bottom-water dissolved oxygen as algal blooms decay. Historically, bay waters were filtered by oysters, but declines in oyster populations from overfishing and disease have led to higher concentrations of fine-sediment particles and phytoplankton in the water column. Assessments of water and biological resource quality in Chesapeake Bay and tributaries, such as the Potomac River, show a continual degraded state. In this paper, we pay tribute to Owen Bricker’s comprehensive, holistic scientific perspective using an approach that examines the connection between watershed and estuary. We evaluated nitrogen inputs from Potomac River headwaters, nutrient-related conditions within the estuary, and considered the use of shellfish aquaculture as an in-the-water nutrient management measure. Data from headwaters, nontidal, and estuarine portions of the Potomac River watershed and estuary were analyzed to examine the contribution from different parts of the watershed to total nitrogen loads to the estuary. An eutrophication model was applied to these data to evaluate eutrophication status and changes since the early 1990s and for comparison to regional and national conditions. A farm-scale aquaculture model was applied and results scaled to the estuary to determine the potential for shellfish (oyster) aquaculture to mediate eutrophication impacts. Results showed that (1) the contribution to nitrogen loads from headwater streams is small (about 2 %) of total inputs to the Potomac River Estuary; (2) eutrophic conditions in the Potomac River Estuary have improved in

  7. Sediment Data from Great Bay Estuary, New Hampshire (ARMSTRONG74 shapefile)

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The sediment data presented in this data layer were from a geochemical study sited in Great Bay Estuary, New Hampshire. The analog data were originally converted...

  8. Physical aspects of estuarine pollution - A case study in Amba river estuary

    Digital Repository Service at National Institute of Oceanography (India)

    DineshKumar, P.K.; Josanto, V.; Sarma, R.V.; Zingde, M.D.

    Tide dominated Amba river estuary was studied to evaluate it's physical characteristics with a point on application to locate a suitable release point of industrial effluents. It is important to site the outfall in a manner ensuring that the water...

  9. Diurnal variation in zooplankton in the Zuari Estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Padmavati, G.; Goswami, S.C.; Vidya, P.S.

    Variations in zooplankton biomass and population density in relation to the prevailing hydrographical conditions were studied in Zuari Estuary, Goa. The physico-chemical parameters showed limited variations. Zooplankton biomass was relatively more...

  10. 2009 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Snohomish River Estuary

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Watershed Sciences, Inc. (WS) co-acquired Light Detection and Ranging (LiDAR) data and Truecolor Orthophotographs of the Snohomish River Estuary, WA on July 20 &...

  11. Characteristics of Sediments in the James River Estuary, Virginia, 1968 (NODC Accession 7001081)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This report presents data on the physical and chemical characteristics of bottom sediments in the James River estuary, Virgina. The data were generated as part of a...

  12. PARASITIC AND SYMBIONIC FAUNA IN OYSTERS (CRASSOSTREA VIRGINICA) COLLECTED FROM THE CALOOSAHATCHEE RIVER AND ESTUARY, FLORIDA

    Science.gov (United States)

    Studies of oysters, Crassostrea virginica, collected from ten sites in the Caloosahatchee River and Estuary, Florida, revealed a varied parasite and symbiotic fauna that have never been reported from this area. Organisms observed included ovacystis virus infecting gametes...

  13. Seasonal changes in suspended sediment load in the Gauthami-Godavari Estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Reddy, N.P.C.; Rao, B.P.; Rao, K.M.; Rao, V.S.

    Studies carried out on suspended matter characteristics of the the Gautami Godavari Estuary revealed that the concentration of suspended matter (CSM) during southwest monsoon influenced mainly by the increased run off at both Neelarevu and Vrudha...

  14. Observed mixed standing-wave signatures in Cochin Estuary on the southwest coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    DineshKumar, P.K.; Srinivas, K.; Muraleedharan, K.R.; Thottam, T.J.

    Study of the characteristics of currents and water-level variations in the Cochin estuary reveals, for the first time, unique signatures of mixed standing-waves in the southern region. Analysis of the simultaneous water-level data generated...

  15. Seasonal variability in penaeid prawn larval abundance in the Mandovi and Zuari estuaries, Goa

    Digital Repository Service at National Institute of Oceanography (India)

    Goswami, S.C.; Goswami, U.

    Seasonal variations in the occurrence and abundance of penaeid prawn larvae in the Mandovi and Zuari estuaries of Goa, India were studied. Larvae and postlarvae of commercially important species viz. Metapenaeus dobsoni (Miers), M. affinis (H. Milne...

  16. Towards New Ambient Light Systems: a Close Look at Existing Encodings of Ambient Light Systems

    Directory of Open Access Journals (Sweden)

    Andrii Matviienko

    2015-10-01

    Full Text Available Ambient systems provide information in the periphery of a user’s attention. Their aim is to present information as unobtrusively as possible to avoid interrupting primary tasks (e.g. writing or reading. In recent years, light has been used to create ambient systems to display information. Examples of ambient light systems range from simple notification systems such as displaying messages or calendar event reminders, to more complex systems such as focusing on conveying information regarding health activity tracking. However, for ambient light systems, there is a broad design space that lacks guidelines on when to make use of light displays and how to design them. In this paper we provide a systematic overview of existing ambient light systems over four identified information classes derived from 72 existing ambient light systems. The most prominent encoding parameters among the surveyed ambient light systems are color, brightness, and their combination. By analyzing existing ambient light systems, we provide a first step towards developing guidelines for designing future ambient light systems.

  17. Biotecnologia Ambiental. Aplicacions biotecnològiques a la millora del medi ambient

    OpenAIRE

    Blanch i Gisbert, Anicet

    2010-01-01

    La biotecnología ambiental comprende el conjunto de actividades tecnológicas que facilitan la comprensión y la gestión de los sistemas biológicos en el medio ambiente, con el fin de proveer productos y servicios. Actualmente, la gestión del medio ambiente y de sus recursos naturales no se comprende si no se realiza de manera sostenible. Los avances científicos y tecnológicos le están permitiendo a la biotecnología ambiental, el desarrollo de nuevas herramientas y aplicaciones con los que resp...

  18. Empresas e meio ambiente: contribuições da legislação ambiental

    Directory of Open Access Journals (Sweden)

    Danielly Ferreira Silva

    2013-12-01

    Full Text Available http://dx.doi.org/10.5007/1807-1384.2013v10n2p334A relação empresa-meio ambiente tem sido, ao longo da história, bastante conflitante. Entretanto, o fortalecimento do debate ambiental, pressões políticas, sociais e econômicas estão, cada vez mais, desencadeando uma mudança na conduta ambiental das empresas. Nesse contexto, o direito ambiental surge como um forte aliado para o alcance de uma nova conduta ambiental empresarial, através de seu papel inicial como regulador, até sua atuação como instrumento no processo de gestão ambiental da empresa. Desse modo, o presente artigo pretende fazer uma reflexão a respeito da importância da legislação ambiental para a evolução da inserção da variável ambiental, nas estratégias das organizações, ressaltando a conformidade legal como um pressuposto básico a ser atendido pelas empresas, independentemente do tipo de estratégias que estas utilizem no caminho pela busca de uma gestão ambiental efetiva.

  19. Nutrient budgets for large Chinese estuaries and embayment

    Directory of Open Access Journals (Sweden)

    S. M. Liu

    2009-01-01

    Full Text Available Nutrient concentrations among the Chinese rivers and bays vary 10–75 fold depending on nutrient elements. The silicic acid levels in South China rivers are higher than those from North China rivers and the yields of dissolved silicate increased from the north to the south of China, indicating the effect of climate on weathering. The nutrient levels in Chinese rivers are higher than those from the large and less-disturbed world rivers such as Amazon and Zaire, but comparable to the values for European and North American polluted and eutrophic rivers like the Loire and Po. This may be ascribed to both of extensive leaching and influences from agricultural and domestic activities over the drainage basins of Chinese rivers. DIN:PO3−4 ratios in most of Chinese rivers and bays are higher (up to 2800 than the other rivers in the world. The atomic ratios of DIN to PO43− in the major Chinese rivers and embayment decrease in exponential trend with increase in the atomic ratios of PO43− to Si(OH4, indicating that primary production in coastal environments changes with the nutrients transport when the urbanization develops to a certain extent, and the potential limited nutrient elements can be changed from phosphorus to nitrogen limitation, which can modify aquatic food webs and then the ocean ecosystem.

    A simple steady-state mass-balance box model was employed. The output shows that the estuaries and embayment behave as a sink or source of nutrients. For the major Chinese estuaries, both residual and mixing flow transport nutrients off the estuaries, and nutrient transport fluxes in summer is 3–4 fold that in winter except comparable for NH4+. These fluxes are 1.0–1.7 fold that estimated by timing riverine nutrient concentrations and freshwater discharge. For the major Chinese embayment, nutrient elements are transported to China Seas

  20. SUSPENDED SEDIMENT TRANSPORT IN THE OFFSHORE NEAR YANGTZE ESTUARY

    Institute of Scientific and Technical Information of China (English)

    CHEN Bin; WANG Kai

    2008-01-01

    Based on the Estuarine, Coastal and Ocean Modeling System with Sediments (ECOMSED) model, a 3-D hydrodynamic-transport numerical model was established for the offshore area near the Yangtze Estuary in the East China Sea .The hydrodynamic module was driven by tide and wind. Sediment module included sediment resuspension, transport and deposition of cohesive and non-cohesive sediment. The settling of cohesive sediment in the water column was modeled as a function of aggregation (flocculation) and deposition. The numerical results were compared with observation data for August, 2006. It shows that the sediment concentration reduces gradually from the seashore to the offshore area. Numerical results of concentration time series in the observation stations show two peaks and two valleys, according with the observation data. It is mainly affected by tidal current. The suspended sediment concentration is related to the tidal current during a tidal cycle, and the maximum concentration appears 1 h-4 h after the current maximum velocity has reached.

  1. Composition and flux of nurtients transport to the Changjiang Estuary

    Institute of Scientific and Technical Information of China (English)

    ZHANGShen; JIHongbing; YANWeijin; DUANShuiwang

    2003-01-01

    Based on the results of water sample measurements of nutrient concentrations at the Datong Station of Changjiang River from 1998 to 1999,combined with historiceal data of water quality,seasonal variations of nutrient concentrations and nutrient transports are discussed.Tthe following results have been obtained:(1)the fluxes of the nitrate nitrogen,ammonium nitrogen and nitrite nitrogen increased by time0series from 1962 to 1990,even if runoff volume had a little variation;(2)the concentrations and fluxes of the dissolved inorganic nitrogen (DIN)and dissolved inorganic phosphorus (DIP)increased notably with time,but those of th dissolved silicon(DSI)decreased pronouncedly,and (3) the concentrations and fluxes changed synchronously with time between the Datong Station and the Changjiang Estuary.

  2. THE CHARACTERISTIC OF MARINE ENVIRONMENT IN LINGDINGYANG ESTUARY

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Hydrologic features, load of main pollutants and current condition of water quality in Lingdingyang Estu ary are discussed by references and monitoring data. Affected by topography, runoff and tide, its dynamic condition is very complicated. Different water areas have different hydrologic features. The topography under the water of Lingdingyang Estuary is higher in the northwest than that in the southeast. The shoal alternates with the deep trough with in the bay. The distribution of the salinity and the contents of the mud and the main pollutants tally with the topography tendency. Change in water quality goes through four stages. Current condition of water quality is fairly good. Inorganic nitrogen is the primary pollutant, and then phosphorus. Rich in nutrition of nitrogen and phosphorus become a more and more prominent problem.

  3. Emissions of biogenic sulfur gases from a danish estuary

    Science.gov (United States)

    Barker Jørgensen, Bo; Okholm-Hansen, Bolette

    The diurnal variations in sulfur emission were studied at seven sites in a Danish estuary, Norsminde Fjord. The sites comprised grass vegetation, intertidal mud flats, accretions of green algae, an exposed shore and a river outlet. Direct measurements of emission rates from soil and water were done by a dynamic flux chamber technique in connection with gas Chromatographie detection and separation of the cryogenically trapped sulfur gases. Sulfur gas concentrations in air and sea water were measured together with emission rates at 0.5-1 h intervals over 25-40 h periods. DMS was the most important sulfur gas released from grass and algae, while mostly H 2S was released from intertidal mud flats. OCS, CH 3SH and CS 2 were released from most sites at lower rates. Emission of DMS followed the daylight variations, often with a delay towards maximum emission rates in the evening. H 2S was mostly emitted at night or in short outbursts during low tides. Total sulfur emission rates were 1-10μmol Sm -2 d -1. Extreme rates of 335μmol DMSm -2 d -1 were measured over decomposing green algae ( Ulva lactuca). H 2S emission fractions were < 10 -6 to 2.10 -4. H 2S was detected, along with DMS, CH 3SH, OCS and CS 2, in the oxic seawater of the estuary at diurnal mean concentrations of 0.1-6.5nmol S/ol -1. This may indicate a more widespread occurrence of H 2S in shallow, near-shore waters at nanomolar levels.

  4. Quantifying nitrogen inputs to the Choptank River estuary

    Science.gov (United States)

    Mccarty, G.; Hapeman, C. J.; Sadeghi, A. M.; Hively, W. D.; Denver, J. M.; Lang, M. W.; Downey, P. M.; Rice, C. P.

    2015-12-01

    The Chesapeake Bay is the largest estuary in the US, and over 50% of its streams have been rated as poor or very poor, based on the biological integrity yearly index. The Choptank River, a Bay tributary on the Delmarva Peninsula, is dominated by intensive corn and soybean farming associated with poultry and some dairy production. The Choptank River is under Environmental Protection Agency (USEPA) total maximum daily load restrictions. However, reducing nonpoint source pollution contributions from agriculture requires that source predictions be improved and that mitigation and conservation measures be properly targeted. Therefore, new measurement strategies have been implemented. In-situ sensors have been deployed adjacent to US Geological Survey gauging stations in the Tuckahoe and Greensboro sub-basins of the Choptank River watershed. These sensors measure stream water concentrations of nitrate along and water quality parameters every 30 min. Initial results indicate that ~40% less nitrate is exported from the Greensboro sub-basin, even though the total amount of agricultural land use is similar to that in the Tuckahoe sub-basin. This is most likely due to more efficient nitrate processing in the Greensboro sub-basin where the amount of cropland on poorly-drained soils is much larger. Another potential nitrogen source to the Choptank River estuary is atmospheric deposition of ammonia. Over 550 million broilers are produced yearly on the Delmarva Peninsula potentially leading to the release of 20,000 Mtons of ammonia. USEPA recently estimated that as much as 22% of nitrogen in the Bay is due to ammonia deposition. We have initiated a collaborative effort within the LTAR network to increase coverage of ammonia sampling and to explore the spatial and temporal variability of ammonia, particularly in the Choptank River watershed. All these measurements will be useful in improving the handling of nitrogen sources and its fate and transport in the Chesapeake Bay model.

  5. Tidal and subtidal hydrodynamics and energetics in a constricted estuary

    Science.gov (United States)

    Zarzuelo, Carmen; López-Ruiz, Alejandro; Díez-Minguito, Manuel; Ortega-Sánchez, Miguel

    2017-02-01

    The dynamics of coastal plain estuaries are mainly associated with variable tidal forcing and local winds in combination with bathymetric complexity and coastline irregularity. Specific features, such as constricted areas, can potentially affect and energize the hydrodynamics of these types of systems. Particularly, tidal range and tidal currents can be significantly amplified where the incoming tidal wave becomes constricted. In this work, the impact of a narrow constriction on a mesotidal estuary was analysed at tidal and subtidal time scales. Tidal hydrodynamics, energy fluxes and energy dissipation were determined for the entire Cádiz Bay (southwestern Spain) using the Delft3D numerical model. Field observations were used to analyse tidal propagation and energy dissipation along the bay constriction and to calibrate and test the numerical model. The results indicate that the presence of the constriction transformed and distorted the tide and increased the tidal range and flow velocities along the channel, with implications on energy dissipation. The tidal currents were oriented along-channel at the central part of the constriction, although abrupt bathymetric changes at the channel inner boundary provoked a sudden rotation of the flow. Although the energy fluxes were higher for spring tides and were strongly influenced by winds, the energy dissipation was controlled by bed shear stresses and vertical dispersion. The significance of this energy dissipation was that it destabilized the water column, which resulted in a weakly stratified system with implications on water quality. At a subtidal scale, the residual water volume exchange was the result of the combined effects of the neap/spring tides, wind and waves, whereas tides were dominant at the tidal scale.

  6. PAH Mineralization and Bacterial Organotolerance in Surface Sediments of the Charleston Harbor Estuary

    Science.gov (United States)

    2010-01-01

    Dissolved oxygen saturation controls PAH biodegradation in freshwater estuary sediments. Microb Ecol 49(2):226–235. doi: 10.1007/s00248-004-0279-0. PMID...15965718 Boyd TJ, Smith DC, Apple JK, Hamdan LJ, Osburn CL, Montgomery MT (2008) Evaluating PAH biodegradation relative to bacterial carbon demand in...ORIGINAL PAPER PAH mineralization and bacterial organotolerance in surface sediments of the Charleston Harbor estuary Michael T. Montgomery Æ Thomas

  7. Hydrodynamic controls of morpho-sedimentary evolution in a rockbounded mesotidal estuary. Tina Menor (N Spain)

    OpenAIRE

    Flor Blanco, G.; Flor, G.; Morales González, Juan Antonio; Pando, L.

    2015-01-01

    The Tina Menor estuary is a highly confined incised valley with advanced sedimentary infilling. The outstanding feature of this estuary is its longitudinal zonation, which forms four segments from the outer to the inner limit: Mouth complex, Bay, Tidal flats and Upper channel. The innermost part of the Bay and the Tidal Flats (semi-reclaimed areas) are broader estuarine zones, whereas the Mouth Complex and outermost Bay are confined by narrow rocky outcrops. This paper explains the d...

  8. Investigation on Water Pollution of Four Rivers in Coastal Wetland of Yellow River Estuary

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    [Objective] The study aimed at analysing water pollution of four rivers in coastal wetland of Yellow River estuary. [Method] Taking four seriously polluted rivers (Guangli River, Shenxian Ditch, Tiao River and Chao River) in coastal wetland of Yellow River estuary as study objects, water samples were collected from the four rivers in May (dry period), August (wet period) and November (normal period) in 2009 and 2010 respectively, then pollution indices like nutritive salts, COD, chlorophyll-a, petroleum, et...

  9. The influence of turbidity on juvenile marine fish in the estuaries of Natal, South africa

    Science.gov (United States)

    Cyrus, D. P.; Blaber, S. J. M.

    1987-11-01

    Results from field studies in Natal estuaries show that the distribution of juvenile marine fish is influenced by turbidity. Laboratory studies on turbidity preference, with other variables excluded, showed good correlation with the field data for eight of ten species tested. The importance of turbidity and other factors to juvenile fish is discussed in relation to the role which estuaries play as nursery areas for juveniles of numerous marine species.

  10. Nitrification in the Schelde estuary: methodological aspects and factors influencing its activity

    OpenAIRE

    2002-01-01

    We present a 15-month dataset on nitrification measurements in the Schelde estuary (Belgium and The Netherlands). Nitrification was estimated using the N-serve sensitive dark 14C-bicarbonate incorporation technique. A peak of nitrification activity was observed in the freshwater part of the estuary. Downstream from this peak, nitrification declined, probably because of ammonium limitation. A range of nitrification inhibitors was tested on both a Nitrosomonas europaea culture and estuarine sam...

  11. Site-specific probabilistic ecological risk assessment of a volatile chlorinated hydrocarbon-contaminated tidal estuary.

    Science.gov (United States)

    Hunt, James; Birch, Gavin; Warne, Michael St J

    2010-05-01

    Groundwater contaminated with volatile chlorinated hydrocarbons (VCHs) was identified as discharging to Penrhyn Estuary, an intertidal embayment of Botany Bay, New South Wales, Australia. A screening-level hazard assessment of surface water in Penrhyn Estuary identified an unacceptable hazard to marine organisms posed by VCHs. Given the limitations of hazard assessments, the present study conducted a higher-tier, quantitative probabilistic risk assessment using the joint probability curve (JPC) method that accounted for variability in exposure and toxicity profiles to quantify risk (delta). Risk was assessed for 24 scenarios, including four areas of the estuary based on three exposure scenarios (low tide, high tide, and both low and high tides) and two toxicity scenarios (chronic no-observed-effect concentrations [NOEC] and 50% effect concentrations [EC50]). Risk (delta) was greater at low tide than at high tide and varied throughout the tidal cycle. Spatial distributions of risk in the estuary were similar using both NOEC and EC50 data. The exposure scenario including data combined from both tides was considered the most accurate representation of the ecological risk in the estuary. When assessing risk using data across both tides, the greatest risk was identified in the Springvale tributary (delta=25%)-closest to the source area-followed by the inner estuary (delta=4%) and the Floodvale tributary (delta=2%), with the lowest risk in the outer estuary (delta=0.1%), farthest from the source area. Going from the screening level ecological risk assessment (ERA) to the probabilistic ERA changed the risk from unacceptable to acceptable in 50% of exposure scenarios in two of the four areas within the estuary. The probabilistic ERA provided a more realistic assessment of risk than the screening-level hazard assessment.

  12. Rapid water quality change in the Elwha River estuary complex during dam removal

    Science.gov (United States)

    Foley, Melissa M.; Duda, Jeffrey J.; Beirne, Matthew M.; Paradis, Rebecca; Ritchie, Andrew; Warrick, Jonathan A.

    2015-01-01

    Dam removal in the United States is increasing as a result of structural concerns, sedimentation of reservoirs, and declining riverine ecosystem conditions. The removal of the 32 m Elwha and 64 m Glines Canyon dams from the Elwha River in Washington, U.S.A., was the largest dam removal project in North American history. During the 3 yr of dam removal—from September 2011 to August 2014—more than ten million cubic meters of sediment was eroded from the former reservoirs, transported downstream, and deposited throughout the lower river, river delta, and nearshore waters of the Strait of Juan de Fuca. Water quality data collected in the estuary complex at the mouth of the Elwha River document how conditions in the estuary changed as a result of sediment deposition over the 3 yr the dams were removed. Rapid and large-scale changes in estuary conditions—including salinity, depth, and turbidity—occurred 1 yr into the dam removal process. Tidal propagation into the estuary ceased following a large sediment deposition event that began in October 2013, resulting in decreased salinity, and increased depth and turbidity in the estuary complex. These changes have persisted in the system through dam removal, significantly altering the structure and functioning of the Elwha River estuary ecosystem.

  13. Complex movement patterns of greenback flounder (Rhombosolea tapirina) in the Murray River estuary and Coorong, Australia

    Science.gov (United States)

    Earl, Jason; Fowler, Anthony J.; Ye, Qifeng; Dittmann, Sabine

    2017-04-01

    The greenback flounder Rhombosolea tapirina is a commercially-important flatfish species in southern Australia and New Zealand, whose population dynamics are poorly understood. Acoustic telemetry was used to assess movement patterns and area use for R. tapirina in the Murray River estuary and Coorong, South Australia. Twenty fish (221-313 mm total length) equipped with acoustic transmitters were monitored for up to seven months during a period of high freshwater inflow. Fish were detected over a large part of the system, but showed a strong preference for brackish and near-marine conditions in the inner estuary. Tagged fish exhibited complex movement patterns that differed among individuals, including: (1) within estuary movements; (2) dispersal from the estuary to the sea; and (3) return migrations between the estuary and the sea. A diurnal shift in fine-scale area use was observed in the part of the estuary where residency was highest, with individuals occupying deeper habitats during the day and shallower areas during the night. The results demonstrate the individualistic and often highly transient behaviour of this species and its ability to undertake regular movements over the spatial scale of 10s of km. Understanding such movement patterns can improve effective management of estuarine flatfish populations and ecosystems.

  14. Movements and residency of juvenile white steenbras Lithognathus lithognathus in a range of contrasting estuaries

    Science.gov (United States)

    Bennett, Rhett H.; Cowley, Paul D.; Childs, Amber-Robyn; Næsje, Tor F.

    2015-01-01

    Acoustic telemetry was used to assess estuarine area use and movements of an overexploited, endemic fishery species in three South African estuaries; two permanently open systems with contrasting salinity gradients and an intermittently open system. Forty juvenile white steenbras Lithognathus lithognathus (215-379 mm FL) were surgically equipped with acoustic transmitters and tracked for up to 355 days. Tagged fish exhibited high levels of site fidelity and long-term residency within each estuary. Most of their time was spent in the lower reaches of all three estuaries and hypersalinity restricted movements into the upper reaches of the freshwater-deprived estuary. All tagged fish exhibited a distinct diel movement pattern. Most individuals (91%) in the two permanently open estuaries also exhibited a tidal-associated pattern, which comprised mainly small-scale (tens to hundreds of metres) transverse movements between deep channels and shallow banks. Observed behaviour was consistent across a range of estuary sizes, types and physico-chemical conditions. This study has identified critical habitats for juvenile white steenbras across a range of estuarine environments. Estuarine management initiatives need to consider these critical habitats, in order to enhance abundance of juveniles and ultimately recruitment to the marine (adult) population.

  15. Migration dynamics of clupeoids in the Schelde estuary: A stable isotope approach

    Science.gov (United States)

    Guelinckx, Jef; Maes, Joachim; De Brabandere, Loreto; Dehairs, Frank; Ollevier, Frans

    2006-02-01

    Large numbers of young of the year herring ( Clupea harengus L.) and sprat ( Sprattus sprattus (L.)) typically enter and remain within North Sea estuaries during the winter months. The main purpose of this study was to examine their migration dynamics between the North Sea and the Schelde estuary using C and N stable isotopes. Prior to this, stomach contents were used to verify the isotopic differences between the food sources at the sampling stations. From May 2000 to April 2001 fish were collected monthly in the upper and lower estuary. Muscle tissue and stomach contents were analyzed for δ13C and δ15N using an EA-IRMS. Based on the stomach contents, it was demonstrated that δ15N could not be used as a tracer for fish migration because the longitudinal estuarine δ15N gradient had reversed completely during autumn. The δ13C gradient, however, was found to be reliable for studying fish movement in the Schelde estuary. Seasonal movements of clupeoids in the Schelde estuary were analyzed by separating the temporal abundance patterns into migration groups based on their muscle isotopic composition. Immigration and emigration seem to occur continuously throughout the year. Most exchange occurred in November. During winter, immigration remained high but gradually decreased. Although the herring and sprat abundance further declined in the estuary during February and March, large seaward emigration was not fully demonstrated. As temporal overlap between immigration and emigration is concluded the results support the hypothesis that migration to estuarine nurseries is individually based.

  16. Delineation of estuarine management areas using multivariate geostatistics: the case of Sado Estuary.

    Science.gov (United States)

    Caeiro, Sandra; Goovaerts, Pierre; Painho, Marco; Costa, M Helena

    2003-09-15

    The Sado Estuary is a coastal zone located in the south of Portugal where conflicts between conservation and development exist because of its location near industrialized urban zones and its designation as a natural reserve. The aim of this paper is to evaluate a set of multivariate geostatistical approaches to delineate spatially contiguous regions of sediment structure for Sado Estuary. These areas will be the supporting infrastructure of an environmental management system for this estuary. The boundaries of each homogeneous area were derived from three sediment characterization attributes through three different approaches: (1) cluster analysis of dissimilarity matrix function of geographical separation followed by indicator kriging of the cluster data, (2) discriminant analysis of kriged values of the three sediment attributes, and (3) a combination of methods 1 and 2. Final maximum likelihood classification was integrated into a geographical information system. All methods generated fairly spatially contiguous management areas that reproduce well the environment of the estuary. Map comparison techniques based on kappa statistics showed thatthe resultant three maps are similar, supporting the choice of any of the methods as appropriate for management of the Sado Estuary. However, the results of method 1 seem to be in better agreement with estuary behavior, assessment of contamination sources, and previous work conducted at this site.

  17. Water budget for the Nueces Estuary, Texas, May-October 1998

    Science.gov (United States)

    Ockerman, D.J.

    2001-01-01

    The Texas Water Development Board (TWDB), Texas Parks and Wildlife Department (TPWD), and Texas Natural Resource Conservation Commission (TNRCC) are charged by the Texas Legislature with determining freshwater inflows required to maintain the ecological health of streams, bays, and estuaries in Texas. To determine required inflows, the three agencies collect data and conduct studies on the needs for freshwater inflows to Texas estuaries.The U.S. Geological Survey (USGS), in cooperation with the TWDB, conducted a study in the Nueces estuary (fig. 1) during May–October 1998 to provide water-budget data for calibration of a TWDB model that will be used to estimate the effects of different freshwater inflow volumes on circulation and salinity in the estuary. The water budget (inflows and outflows) for the Nueces estuary was estimated by using (1) data collected during this study, (2) data collected at two upstream streamflow-gaging stations previous to this study, and (3) evaporation and return-flow data obtained from other agencies. This fact sheet describes the data-collection methods and the results of the water-budget estimates for the Nueces estuary.

  18. Potential Impacts and Management Implications of Climate Change on Tampa Bay Estuary Critical Coastal Habitats

    Science.gov (United States)

    Sherwood, Edward T.; Greening, Holly S.

    2014-02-01

    The Tampa Bay estuary is a unique and valued ecosystem that currently thrives between subtropical and temperate climates along Florida's west-central coast. The watershed is considered urbanized (42 % lands developed); however, a suite of critical coastal habitats still persists. Current management efforts are focused toward restoring the historic balance of these habitat types to a benchmark 1950s period. We have modeled the anticipated changes to a suite of habitats within the Tampa Bay estuary using the sea level affecting marshes model under various sea level rise (SLR) scenarios. Modeled changes to the distribution and coverage of mangrove habitats within the estuary are expected to dominate the overall proportions of future critical coastal habitats. Modeled losses in salt marsh, salt barren, and coastal freshwater wetlands by 2100 will significantly affect the progress achieved in "Restoring the Balance" of these habitat types over recent periods. Future land management and acquisition priorities within the Tampa Bay estuary should consider the impending effects of both continued urbanization within the watershed and climate change. This requires the recognition that: (1) the Tampa Bay estuary is trending towards a mangrove-dominated system; (2) the current management paradigm of "Restoring the Balance" may no longer provide realistic, attainable goals; (3) restoration that creates habitat mosaics will prove more resilient in the future; and (4) establishing subtidal and upslope "refugia" may be a future strategy in this urbanized estuary to allow sensitive habitat types (e.g., seagrass and salt barren) to persist under anticipated climate change and SLR impacts.

  19. Facilitation of the Estuary/Ocean Subgroup for Research, Monitoring, and Evaluation, FY06 Annual Report

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.

    2006-10-03

    This annual report is a deliverable for fiscal year 2006 (FY06) for Project 2002-077-00, Facilitation of the Estuary/Ocean Subgroup (EOS). The EOS is part of the research, monitoring, and evaluation (RME) effort the Action Agencies (Bonneville Power Administration, U.S. Army Corps of Engineers, U.S. Bureau of Reclamation) developed in response to the 2000 and 2004 Biological Opinions on operation of the Federal Columbia River Power System. The goal of the EOS project is to facilitate activities of the estuary/ocean RME subgroup as it coordinates implementation of the Estuary RME Plan. In FY06, EOS project accomplishments included: 1) subgroup meetings; 2) participation in the estuary work group of the Pacific Northwest Aquatic Monitoring Partnership; 3) project management via the project tracking system, PISCES; 4) quarterly project status reports; and 5) a major revision to the Estuary RME Plan (new version May 2006) based on comments by EOS members, the Independent Scientific Review Panel, and other reviewers. In the context of uncertainty about the direction of the federal RME due to litigation on the FCRPS Biological Opinion, FY06 activities for the EOS project resulted in expanded substantive coordination with other regional RME forums, project tracking infrastructure, and a new version of the Estuary RME Plan.

  20. Timing and route of migration of mature female blue crabs in a tidal estuary.

    Science.gov (United States)

    Eggleston, David B; Millstein, Erika; Plaia, Gayle

    2015-05-01

    Information on migration patterns is critical to using no-take migratory corridors and marine reserves to protect the spawning stock of commercially exploited species. Both active and passive acoustic tracking methods quantified movement of commercially and ecologically important blue crabs in the White Oak River estuary, NC, USA. We targeted post-mating female crabs migrating down-estuary to oceanic spawning grounds. Crabs travelled approximately 14.1 km mainly in deeper channels and over 12-26 days from mating areas to spawning grounds. No crabs were detected migrating down-estuary in the autumn and only 30% were detected migrating down-estuary in spring. None of the crabs detected near spawning grounds were detected or recaptured back up-estuary, suggesting that they either (i) do not return to the estuary after a one to two week period in the spawning area or (ii) were captured by fishermen. The results from this study demonstrate that (1) acoustic transmitters coupled with passive acoustic receivers provided reliable and valuable data on migration patterns of mature female blue crabs and (2) mature female blue crabs are capable of migrating primarily within deep channels to spawning grounds shortly after insemination.

  1. Pollution in the estuary of the Baracoa river, La Habana, Cuba

    Directory of Open Access Journals (Sweden)

    Regla Duthit Somoza

    2011-04-01

    Full Text Available The environmental quality of the Baracoa river estuary was studied from the physic (temperature and salinity, chemic variables (dissolved oxygen, oxygen biochemical demand (DBO, oxygen chemical demand (DQO, nitrogen cycle, inorganic phosphorus and total phosphorus and the microbiological variables (total and thermotolerant coliforms and faecal streptococci. The samplings were made on February 2006, May and October 2007. Spatial distribution of the physical and chemical parameters measured suggests that the estuary is dominated by the marine conditions. The salinity and temperature analyses show that in general the characteristics of the estuary could be influenced by the contribution of the river basin drainage. In general, the concentrations of the measured parameters in the Baracoa river estuary, strongly suggest that this area is under influence of human activities on the river basin, due to the low levels of dissolved oxygen and an oxygen average deficit of -1.6 mg/L. nthropogenic actions in this estuary are mainly related to the emission of domestic and farming rejects without suitable treatment. This is visibly associated with the observed values of the total coliforms concentrations as well as the concentration of faecal streptococci, that surpassed reference values from the Cuban norm for water quality, following on bad or doubtful quality levels pointing out negatively measurements made next to the communication channel the estuary and the El Doctor lagoon.

  2. A classification of U.S. estuaries based on physical and hydrologic attributes

    Science.gov (United States)

    Engle, V.D.; Kurtz, J.C.; Smith, L.M.; Chancy, C.; Bourgeois, P.

    2007-01-01

    A classification of U.S. estuaries is presented based on estuarine characteristics that have been identified as important for quantifying stressor-response relationships in coastal systems. Estuaries within a class have similar physical and hydrologic characteristics and would be expected to demonstrate similar biological responses to stressor loads from the adjacent watersheds. Nine classes of estuaries were identified by applying cluster analysis to a database for 138 U.S. estuarine drainage areas. The database included physical measures of estuarine areas, depth and volume, as well as hydrologic parameters (i.e., tide height, tidal prism volume, freshwater inflow rates, salinity, and temperature). The ability of an estuary to dilute or flush pollutants can be estimated using physical and hydrologic properties such as volume, bathymetry, freshwater inflow and tidal exchange rates which influence residence time and affect pollutant loading rates. Thus, physical and hydrologic characteristics can be used to estimate the susceptibility of estuaries to pollutant effects. This classification of estuaries can be used by natural resource managers to describe and inventory coastal systems, understand stressor impacts, predict which systems are most sensitive to stressors, and manage and protect coastal resources. ?? Springer Science+Business Media B.V. 2007.

  3. El estudio de rasgos semánticos en cuasisinónimos y términos relacionados: un modo de crear conciencia léxico-semántica en una segunda lengua

    Directory of Open Access Journals (Sweden)

    Paula Jullian R.

    1998-09-01

    Full Text Available Este artículo da a conocer una actividad para alumnos avanzados de inglés con el fin de crear en ellos conciencia léxico-semántica y así enriquecer su vocabulario activo. Esta actividad introduce a los alumnos al estudio del significado de la palabra, investigando toda la carga semántica de términos relacionados. La metodología consiste en la colección de conjuntos léxicos, el estudio de rasgos distintivos, la identificación de las colocaciones apropiadas, las restricciones contextuales y los posibles usos metafóricos de cada palabra del conjunto. Esta metodología será de especial interés para profesores preocupados del estilo y que esperan que el habla de sus alumnos avanzados gane en precisión y fuerza léxica. (This paper reports on an activity carried out with upper advanced learnersto help them raise word meaning awareness and eventually expand theiractive vocabulary. The activity here described introduces learners to the study of word meaning, by looking into the full semantic contents of related words. The task consists in collecting lexical sets, the study of their semantic features, the identification of their appropriate collocations, contextual limitations, and possible figurative uses. This paper will be of special interest to teachers who wish their learners' discourse to gain in accuracy and lexical force.

  4. The use of environmental integrative indicators to assess seabed disturbance in estuaries and coasts: Application to the Humber Estuary, UK.

    Science.gov (United States)

    Aubry, Aurélie; Elliott, M

    2006-01-01

    The coastal zone is subject to many and varied changes resulting from human activities and natural processes. Existing or emerging agreements and legislation acknowledge the relevance of indicators for monitoring these. In the UK, following a series of recent workshops, potential indicators of nearshore disturbance have been identified and grouped into three broad indices: 'Coastline Morphological Change', 'Resource Use Change' and 'Environmental Quality and its Perception'. The present study developed these indicators further and tested their use by applying them to 18 sections in the Humber Estuary, Eastern England. The results obtained reflect the current knowledge of the state of the Humber environment and show the potential of integrative indicators but indicate that further studies are required to assess the relative importance of the indicators and their value in reflecting the ability of the ecosystems to sustain natural habitats and populations at a good conservation status.

  5. 40 CFR 51.190 - Ambient air quality monitoring requirements.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 2 2010-07-01 2010-07-01 false Ambient air quality monitoring... PROGRAMS REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS Ambient Air Quality Surveillance § 51.190 Ambient air quality monitoring requirements. The requirements for monitoring ambient...

  6. 49 CFR 325.35 - Ambient conditions; highway operations.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 5 2010-10-01 2010-10-01 false Ambient conditions; highway operations. 325.35... Ambient conditions; highway operations. (a)(1) Sound. The ambient A-weighted sound level at the microphone... § 325.23. (2) The measured ambient level must be 10 dB(A) or more below that level specified in §...

  7. Geochemistry of the suspended sediment in the estuaries of the Mandovi and Zuari rivers, central west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Kessarkar, P.M.; Shynu, R.; Rao, V.P.; Chong, F.; Narvekar, T.; Zhang, J.

    . 1989. Transport of river-derived trace metals through the coastal zone. Netherlands Journal of Sea Research 23: 359–368. Buggy, C. J. and J. M. Tobin. 2008. Seasonal and spatial distribution of metals in surface sediment of an urban estuary.... Purnachandra Rao) Keywords: suspended sediment, estuarine processes, clay minerals, major and trace metals, Mandovi and Zuari estuaries 2    Introduction Studies on the composition and transport of suspended particulate matter (SPM) in estuaries have...

  8. The Aesthetics of the Ambient Video Experience

    Directory of Open Access Journals (Sweden)

    Jim Bizzocchi

    2008-01-01

    Full Text Available Ambient Video is an emergent cultural phenomenon, with roots that go deeply into the history of experimental film and video art. Ambient Video, like Brian Eno's ambient music, is video that "must be as easy to ignore as notice" [9]. This minimalist description conceals the formidable aesthetic challenge that faces this new form. Ambient video art works will hang on the walls of our living rooms, corporate offices, and public spaces. They will play in the background of our lives, living video paintings framed by the new generation of elegant, high-resolution flat-panel display units. However, they cannot command attention like a film or television show. They will patiently play in the background of our lives, yet they must always be ready to justify our attention in any given moment. In this capacity, ambient video works need to be equally proficient at rewarding a fleeting glance, a more direct look, or a longer contemplative gaze. This paper connects a series of threads that collectively illuminate the aesthetics of this emergent form: its history as a popular culture phenomenon, its more substantive artistic roots in avant-garde cinema and video art, its relationship to new technologies, the analysis of the viewer's conditions of reception, and the work of current artists who practice within this form.

  9. Decadal morphological evolution of the Yangtze Estuary in response to river input changes and estuarine engineering projects

    Science.gov (United States)

    Luan, Hua Long; Ding, Ping Xing; Wang, Zheng Bing; Ge, Jian Zhong; Yang, Shi Lun

    2016-07-01

    The Yangtze Estuary in China has been intensively influenced by human activities including altered river and sediment discharges in its catchment and local engineering projects in the estuary over the past half century. River sediment discharge has significantly decreased since the 1980s because of upstream dam construction and water-soil conservation. We analyzed bathymetric data from the Yangtze Estuary between 1958 and 2010 and divided the entire estuary into two sections: inner estuary and mouth bar area. The deposition and erosion pattern exhibited strong temporal and spatial variations. The inner estuary and mouth bar area underwent different changes. The inner estuary was altered from sedimentation to erosion primarily at an intermediate depth (5-15 m) along with river sediment decline. In contrast, the mouth bar area showed continued accretion throughout the study period. The frequent river floods during the 1990s and simultaneously decreasing river sediment probably induced the peak erosion of the inner estuary in 1986-1997. We conclude that both sediment discharge and river flood events played important roles in the decadal morphological evolution of the Yangtze Estuary. Regarding the dredged sediment, the highest net accretion rate occurred in the North Passage where jetties and groins were constructed to regulate the navigation channel in 1997-2010. In this period, the jetties induced enhanced deposition at the East Hengsha Mudflat and the high accretion rate within the mouth bar area was maintained. The impacts of estuarine engineering projects on morphological change extended beyond their sites.

  10. Tidal wetland conservation and restoration for flood mitigation in estuaries and deltas: examples and global potential

    Science.gov (United States)

    Temmerman, Stijn; Smolders, Sven; Stark, Jeroen; meire, patrick

    2014-05-01

    Low-lying and densely populated deltas and estuaries are world widely exposed to flood risks caused by storm surges. On the one hand, global change is increasing these flood risks through accelerating sea level rise and increasing storm intensity, but on the other hand, local-scale human impacts on deltas and estuaries are in many cases even more increasing the vulnerability to floods. Here we address the degradation and reclamation of tidal wetlands (i.e. salt marshes in the temperate zone and mangroves in the tropical zone) as a major source for increasing vulnerability to flooding of estuaries and deltas. Firstly, we present examples of flood mitigation by tidal wetland conservation and restoration, and secondly we explore the potentials and limitations for global application of this approach of ecosystem-based flood defense (see Temmerman et al. 2013). First, we use the Scheldt estuary (SW Netherlands and Belgium) as an example where historic wetland reclamation has importantly contributed to increasing flood risks, and where tidal marsh restoration on the previously reclaimed land is nowadays brought into large-scale practice as an essential part of the flood defense system. Based on data and hydrodynamic modelling, we show that large-scale historic marsh reclamation has largely reduced the water storage capacity of the estuary and has reduced the friction to propagating flood waves, resulting in an important landward increase of tidal and storm surge levels. Hydrodynamic model scenarios demonstrate how tidal and storm surge propagation through the estuary are affected by tidal marsh properties, including the surface area, elevation, vegetation and position of marshes along the estuary. We show that nowadays tidal wetland creation on previously reclaimed land is applied as an essential part of the flood defense system along the Scheldt estuary. Secondly, a global analysis is presented of the potential application of tidal wetlands in flood mitigation in

  11. Educação ambiental: acções de educação ambiental

    OpenAIRE

    Caeiro, Sandra; Carapeto, Cristina

    1999-01-01

    Académico - Licenciaturas Este vídeo mostra os conceitos de educação ambiental e sensibilização ambiental e ilustra as fases de um projeto de educação ambiental e de uma ação de educação ambiental.

  12. Ocean Ambient Noise Measurement and Theory

    CERN Document Server

    Carey, William M

    2011-01-01

    This book develops the theory of ocean ambient noise mechanisms and measurements, and also describes general noise characteristics and computational methods.  It concisely summarizes the vast ambient noise literature using theory combined with key representative results.  The air-sea boundary interaction zone is described in terms of non-dimensional variables requisite for future experiments.  Noise field coherency, rare directional measurements, and unique basin scale computations and methods are presented.  The use of satellite measurements in these basin scale models is demonstrated.  Finally, this book provides a series of appendices giving in-depth mathematical treatments.  With its complete and careful discussions of both theory and experimental results, this book will be of the greatest interest to graduate students and active researchers working in fields related to ambient noise in the ocean.

  13. Evaluación ambiental del PRMC

    Directory of Open Access Journals (Sweden)

    Waldo López Moya

    2015-04-01

    Full Text Available El presente artículo es una revisión constructiva de las actuales disposiciones sobre la evaluación ambiental de los planes reguladores, intentada con el propósito de contribuir a mejorar los procedimientos en práctica. En este sentido, aboga porque al plan regulador no se le exijan contribuciones ambientales que excedan a sus verdaderas competencias, para lo cual introduce el concepto de "efectos territoriales"; justifica que su evaluación ambiental deba ser realizda mediante una "declaración", y ahonda en la forma de elaborar y presentar esta declaración, acogiendo lo que a este respecto estipula el Art. 15° del Reglamento de la ley sobre Bases Generales del Medio Ambiente.

  14. Learning from an Ambient Assisted Living Lab

    DEFF Research Database (Denmark)

    Bygholm, Ann; Kanstrup, Anne Marie

    2014-01-01

    This paper presents methodological lessons learned from an Ambient Assisted Living (AAL) lab exploring the use of intelligent beds in a nursing home. The living lab study was conducted over a period of three month. 20 intelligent beds were installed. Data was collected via self-registration, diar......This paper presents methodological lessons learned from an Ambient Assisted Living (AAL) lab exploring the use of intelligent beds in a nursing home. The living lab study was conducted over a period of three month. 20 intelligent beds were installed. Data was collected via self...

  15. A Kleene analysis of Mobile Ambients

    DEFF Research Database (Denmark)

    Nielson, Flemming; Nielson, Hanne Riis; Sagiv, M.

    2000-01-01

    We show how a program analysis technique originally developed for C-like pointer structures can be adapted to analyse the hierarchical structure of processes in the ambient calculus. The technique is based on modeling the semantics of the language in a two-valued logic; by reinterpreting the logi......We show how a program analysis technique originally developed for C-like pointer structures can be adapted to analyse the hierarchical structure of processes in the ambient calculus. The technique is based on modeling the semantics of the language in a two-valued logic; by reinterpreting...

  16. Ambient Interstellar Pressure and Superbubble Evolution

    CERN Document Server

    Oey, M S

    2004-01-01

    High ambient interstellar pressure is suggested as a possible factor to explain the ubiquitous observed growth-rate discrepancy for supernova-driven superbubbles and stellar wind bubbles. Pressures of P/k ~ 1e5 cm-3 K are plausible for regions with high star formation rates, and these values are intermediate between the estimated Galactic mid-plane pressure and those observed in starburst galaxies. High-pressure components also are commonly seen in Galactic ISM localizations. We demonstrate the sensitivity of shell growth to the ambient pressure, and suggest that superbubbles ultimately might serve as ISM barometers.

  17. Human-Centric Interfaces for Ambient Intelligence

    CERN Document Server

    Aghajan, Hamid; Delgado, Ramon Lopez-Cozar

    2009-01-01

    To create truly effective human-centric ambient intelligence systems both engineering and computing methods are needed. This is the first book to bridge data processing and intelligent reasoning methods for the creation of human-centered ambient intelligence systems. Interdisciplinary in nature, the book covers topics such as multi-modal interfaces, human-computer interaction, smart environments and pervasive computing, addressing principles, paradigms, methods and applications. This book will be an ideal reference for university researchers, R&D engineers, computer engineers, and graduate s

  18. Hybrid Logical Analyses of the Ambient Calculus

    DEFF Research Database (Denmark)

    Bolander, Thomas; Hansen, René Rydhof

    2007-01-01

    In this paper, hybrid logic is used to formulate a rational reconstruction of a previously published control flow analysis for the mobile ambients calculus and we further show how a more precise flow-sensitive analysis, that takes the ordering of action sequences into account, can be formulated...... in a natural way. We show that hybrid logic is very well suited to express the semantic structure of the ambient calculus and how features of hybrid logic can be exploited to reduce the "administrative overhead" of the analysis specification and thus simplify it. Finally, we use HyLoTab, a fully automated...

  19. A RESPONSABILIDADE CIVIL E O MEIO AMBIENTE

    Directory of Open Access Journals (Sweden)

    DELCYLENE VILLALBA SOARES

    2012-06-01

    Full Text Available RESUMOEste artigo tem por finalidade realizar uma análise sobre a evolução da responsabilidade civil e suas teorias, subjetiva e objetiva aplicadas ao meio ambiente. Dentro desta área, deve-se ressaltar que a responsabilidade civil ao meio ambiente, é um assunto de importante relevância para o efetivo controle da depredação ambiental, permitindo que sejam alcançadas as metas propostas como condição de sobrevivência da espécie humana, ou seja, a conservação do meio ambiente e o desenvolvimento econômico social, visando desta maneira, permitir a qualidade e a continuação da vida. Existe o entendimento, que somente com educação ambiental e normas reguladoras fortes, como a penalidade de ter que indenizar quando praticar algum dano ao meio ambiente conseguirá atingir o objetivo maior de preservação. Necessitam-se além de uma mudança na legislação que responsabilize poluidores do meio ambiente, atribuindo-lhes sanções que inibam a prática de tal conduta ilícita e realizando assim, a aplicabilidade da justiça.Palavras-chave:Responsabilidade Civil; Responsabilidade; Meio Ambiente ABSTRACTThis article have objective to realize a analysis about civil responsibility evolution and your theories, subjective and objective apply environment. Inside this area have to stand out that civil responsibility environment, it is a theme very important relevance for environment depredation control effective, permitting have been obtain proposals target like been human survival condition, therefore, environment conservation and social economic development objective permit quality and continuation of life. There is understanding, that only with environment education and strong regulation principle, like penalty has to indemnify when practice some injury of environment, will obtain more preservation. Demand a change on legislation that responsible environment polluter attribute him inhibit sanctions for practice this illicit conduct and

  20. A responsabilidade civil no direito ambiental brasileiro

    OpenAIRE

    Henkes,Silviana L.

    2009-01-01

    O Direito assumiu papel preponderante na gestão dos riscos na sociedade contemporânea definida, por muitos autores, como de Risco; com isso, novos direitos foram instituídos e novos instrumentos e meios de tutela foram criados. A responsabilidade civil ambiental tornou-se um dos principais instrumentos criado para a gestão do risco ambiental e tem-se harmonizado com a nova realidade marcada por incertezas científicas, riscos e danos globais. O objetivo deste trabalho foi analisar a responsabi...