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Feeding ecology of Erythrolamprus jaegeri jaegeri (Günter, 1858) and Erythrolamprus poecilogyrus sublineatus (Cope, 1860) in the coastal zone of Subtropical Brazil (Serpentes, Dipsadidae).
Corrêa, Daniele N; Quintela, Fernando M; Loebmann, Daniel.
Afiliação
  • Corrêa DN; Laboratório de Vertebrados, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil, Brasil.
  • Quintela FM; Laboratório de Vertebrados, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil, Brasil.
  • Loebmann D; Laboratório de Vertebrados, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil, Brasil.
An Acad Bras Cienc ; 88(1): 293-308, 2016 Mar.
Article em En | MEDLINE | ID: mdl-26840002
ABSTRACT
The snakes Erythrolamprus jaegeri jaegeri and Erythrolamprus poecilogyrus sublineatus are sympatric and syntopic in the coastal region of southern Brazil. Herein, we analyzed the diet composition to evaluate the niche breadth and the prey selection by both species. We examined 192 specimens, and analysis of stomach contents revealed that both species predominantly consume anurans. However, the diet of E. j. jaegeri consists mainly of fish and amphibians, whereas that of E. p. sublineatus is broader, including fish, amphibians, reptiles and mammals. The Standardized Levins Index presented lower values for E. j. jaegeri (BA = 0.17) than for E. p. sublineatus (BA = 0.61), evidencing specialist and generalist strategies for each species, respectively. Regarding prey selection, E. p. sublineatus presented a larger snout-vent length, head, mouth and lower jaw than E. j. jaegeri and fed on larger prey. In addition, positive correlations between the size and weight of predators and prey were confirmed in both species. The results show the development of different mechanisms for co-occurrence of the two species, such as prey selection by size, such that the size of the predator is related to the size of their prey, or by developing different strategies to decrease niche overlap between species.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Comportamento Predatório / Serpentes / Comportamento Alimentar / Conteúdo Gastrointestinal Idioma: En Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Comportamento Predatório / Serpentes / Comportamento Alimentar / Conteúdo Gastrointestinal Idioma: En Ano de publicação: 2016 Tipo de documento: Article