Aspectos da morfologia na relação presa/predadores de três predadores Characiformes e suas principais presas

• Autor(a) principal: Villares Júnior, Gilberto Aparecido [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/134072; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/13-01-2016/000856926.pdf
• topic: Animal ecology; Ecologia animal; Morfologia (Animais); Peixe - Alimentação; Animais predadores; Predação (Biologia); Animais - Comportamento

In this study specimens of three species of Characiformes predators were analysed: Salminus hilarii, Hoplias cf. malabaricus and Acestrorhynchus lacustris in order to verify the patterns in hunting strategies adopted by predators and escape strategies adopted by their prey according to their morphological characteristics. The study aimed to identify the differences in morphology between species of predators and their prey; identify the differences between predator species and identify the differences between the prey species. The study was conducted in the basin of the river Sorocaba, by studing sites located in the lower Rio Sorocaba region at points near the cities of Tatuí and Boituva (SP). The samples were obtained in certain places according to the living habits of each species. The tusks were determined previously based on the dietary analysis by the Alimentary Index. In the morphology analysis were chosen 25 morphometric measurements, which were used for the calculations of 22 indices and relative values of the morphological attributes. For the analyzes of morphological attributes was chosen multivariate correlation of principal component analysis (PCA). The comparison between predators aimed to focus on the differences in morphology related to swimming, trying to identify the possible capture strategies by the predator and escape by the prey. To compare the predators were addressed aspects of swimming and feeding were chosen in order to answer about the different living habits and the possible differences in the strategies adopted to capture their prey. The comparison between the prey species were only addressed to the swimming aspects to identify living habits and the possible defense behavior strategies and escape each of the prey could possibly adopt. Diet analysis showed that the most important prey in Salminus hilarii diet were Astyanax aff. fasciatus and Astyanax altiparanae. To Hoplias cf. malabaricus were A. altiparanae ...