Sample records for squirrels
from WorldWideScience.org

Sample records 1 - 4 shown.



1

Predação e remoção de sementes de cinco espécies de palmeiras por Guerlinguetus ingrami (Thomas, 1901) em um fragmento urbano de Floresta Atlântica Montana/ Predation and removal of seeds from five species of palms by Guerlinguetus ingrami (Thomas, 1901) in an urban fragment of the Montane Atlantic Forest

Ribeiro, Luci Ferreira; Conde, Luciana Onécia Machado; Tabarelli, Marcelo
2010-08-01

Resumo em português Em um fragmento urbano de Floresta Ombrófila Densa Montana no Estado do Espírito Santo (Sudeste do Brasil), foram avaliados o padrão de frugivoria e as proporções de remoção, predação e armazenamento de frutos por Guerlinguetus ingrami, em relação a cinco espécies de palmeira (Syagrus pseudococos, S. ruschiana, Bactris setosa, Polyandrococos caudescens e Euterpe edulis). As espécies de Arecaceae enquadram-se na síndrome associada à dispersão por G. ingrami (mais) , na qual as espécies de plantas apresentam alta produção, grandes frutos com poucas sementes envolvidas por endocarpos resistentes e que não são usadas por outros predadores de sementes arborícolas. Os resultados apontaram que existem diferenças no padrão de frugivoria da espécie G. ingrami quando comparadas com as de espécies com a mesma síndrome; aquelas que possuem frutos maiores apresentaram maior taxa de remoção e de armazenamento de seus diásporos. E, devido à especificidade exibida por G. ingrami na atividade de dispersão de sementes, este roedor deverá atuar apenas em trocas compensatórias específicas em pequenos fragmentos defaunados. Portanto, a seletividade de G. ingrami poderia indicar que o seu papel como dispersor em pequenos fragmentos estaria restrito em função da maior probabilidade de mortalidade associada às plantas preferencialmente dispersas por essa espécie, e sua atuação como predador de sementes deve ser quantificada para que os seus efeitos, em pequenos fragmentos, sejam mais bem compreendidos. Resumo em inglês This study investigated the fruvigory pattern of Guerlinguetus ingrami, considering the removal, predation and caching of the fruits of palm species (Syagrus pseudococos, S. ruschiana, Bactris setosa, Polyandrococos caudescens and Euterpe edulis) in an urban forest fragment of the montane Atlantic forest in the state of Espírito Santo, Southeastern Brazil. These palm species show characteristics theoretically expected to be seen in plants dispersed by squirrels (trees wi (mais) th a high productivity and whose fruits are large, with few seeds covered by rigid endocarps and that are not utilized by other arborean seed predators). Here we describe differences in the frugivory pattern exhibited by G. ingrami towards plants with the same dispersal syndrome. The diaspores of species with larger fruits were removed and cached by the squirrel at rates higher than the palms with small fruits. As a result of the high specificity showed by the squirrel's activities related to seed dispersal, this rodent should be important in compensatory shifts only in small, defaunated forest fragments. Therefore, the selectivity of G. ingrami could indicate that its role as a seed dispersor into small forest fragments would be restricted, due to the grater likelihood of mortality associated to the plants scattered by this species. The role of G. ingrami as a seed predator must be quantified for the effects of its behavioral activities in small fragments to be understood.

Scientific Electronic Library Online (Portuguese)

2

Formas de abertura dos frutos de Syagrus romanzoffiana (Chamisso) glassman efetuadas por Sciurus ingrami Thomas (Rodentia, Sciuridae)/ Opening forms of palm nuts Syagrus romanzoffiana (Chamisso) Glassman made by Sciurus ingrami Thomas (Rodentia, Sciuridae)

Bordignon, Marcelo; Margarido, Teresa Cristina C; Lange, Rogério R
1996-01-01

Resumo em inglês In this work was identifyed the diferents opening forms of the palm nuts Syagrus romanzoffiana by brazilian squirrel Sciurus ingrami in four diferents points of Curitiba, Paraná, Brazil. Was caracterized tive basic forms of opening, in acording with the number of incisions and opening aspects. The form with lower number of incisions (two) was also the greather frequently in the four points sampled (66,25%; N = 5194) well as registred the lower opening time (7,2 ± 1,7 mi (mais) n) in relationship with other forms (9,2 ± 2,3 min). To explicate the diferences in the frequences of forms discovered, is proposed "apprenticeship's hypothesis" which the young squirrels of the population, along the opening nuts apprenticeship, to passing of the forms with larger number of incisions to forms with lower number of incisions, ending in the form of more frequence, which is maintained by adult squirrels.

Scientific Electronic Library Online (Portuguese)

3

Dieta de Sciurus ingrami Thomas (Rodentia, Sciuridae) em um remanescente de Floresta com Araucária, Paraná, Brasil/ Diet of Sciurus ingrami Thomas (Rodentia, Sciuridae) on a Araucauria Pine Forest remnant, Paraná, Brazil

Miranda, João M. D.
2005-12-01

Resumo em português Este estudo foi realizado entre fevereiro de 2002 e janeiro de 2003, em um remanescente de Floresta com Araucária, localizado no Distrito do Bugre, Município de Balsa Nova, Paraná, Brasil. O objetivo foi conhecer as espécies utilizadas na alimentação por Sciurus ingrami Thomas, 1901 no decorrer de um ano. Foram registradas dez (N = 10) espécies na dieta dos serelepes, pertencentes a sete famílias botânicas. Os serelepes predaram sementes de três espécies e se alimentaram de três espécies exóticas, mostrando adaptabilidade a ambientes alterados. Resumo em inglês This study was conducted between February, 2002 and January, 2003 in a remnant of Araucaria Pine Forest located in the District of Bugre, Municipality of Balsa Nova, Paraná, Brazil. The goal of this study was to survey the species used as food items by Sciurus ingrami Thomas, 1901 throughout a year. Ten (N = 10) species were recorded in the diet of these squirrels, belonging to seven plant families. Squirrels preyed on seeds of three plant species and fed on three exotic species, indicating good adaptability to disturbed habitats.

Scientific Electronic Library Online (Portuguese)

4

Comportamentos e atividade diária de Sciurus ingrami (Thomas) em cativeiro (Rodentia, Sciuridae)/ Behaviour and diary activity of Sciurus ingrami (Thomas) in captivity (Rodentia, Sciuridae)

Bordignon, Marcelo; Monteiro Filho, Emygdio L.A
1997-09-01

Resumo em inglês From October 1994 to November 1995 the behaviour, postures and diurnal activity of tive captive squirrels Sciurus ingrami were observed and registered. Four basics postures, five grooming behaviours, displacements and face wiping behaviour were identified. Based on behavioural observations, the diurnal activity was divided into four categories: resting, displacement, teeding and maintenance. The time spent in each category varied seasonally and the squirrels spent more ti (mais) me resting during winter and spring. However, more time was spent feeding during autum and summer and was reduced the displacement in autum. Two types of breeding behaviour were identified: sexual trailing and mating chase of females by males. However copulatori behaviour was not recorded during the studied period. We also verified that S. ingrami presents thermorregulation behaviour during winter, remaining resting in the nest to conserve energy in heath maintenance. During the hottest seasons, the squirrels remain resting out of the nest, placed on the branchs to decrease their body heat to normal temperature, The behaviours observed in this study were similar to those described in the literature, as well as the mating behaviour, which was very similar to S. carolinensis.

Scientific Electronic Library Online (Portuguese)