Habitat use, trophic, and occurrence patterns of Inpaichthys kerri and Hyphessobrycon vilmae (Pisces: Characidae) in Amazonian streams

Autor(es)

Jaquelini O. Zeni ; Luisa Martins Sensato-Azevedo ^[2] ; Eduardo Fernando dos Santos ^[3] ; Gabriel Lourenço Brejão ^[4] ; Lilian Casatti ^[5]

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 18, n. 3 2020-10-09.

Resumo

Abstract Fish ecomorphology and diet can help us to understand species response to impacts and coexistence patterns. Thus, we developed a comparative analysis of ecomorphology and diet of Inpaichthys kerri and Hyphessobrycon vilmae and tested for environmental variables that explain their abundance in headwater streams. We sampled streams from the Aripuanã River basin, Mato Grosso State, Brazil. We sampled environmental variables following a standardized protocol and used 30 and 80 individuals from each species to obtain ecomorphological attributes and feeding index, respectively. To identify environmental variables that influence species abundance, we developed generalized additive mixed models. Inpaichthys kerri presented broader and deeper caudal peduncles, more dorsal eyes, and larger fins, besides the lower consumption of aquatic insects, algae, and detritus when compared to H. vilmae. Inpaichthys kerri was more abundant in fast waters with little amounts of marginal grasses, conditions associated with more forested streams, while H. vilmae was more in streams with more abundant marginal grasses from pasture. Deforestation in the Aripuanã basin threatens the persistence of I. kerri, since its optimal environmental conditions tend to be replaced by H. vilmae optimal conditions. Natural history helps us to understand species occurrence and represents a substantial contribution for more effective conservation measures. (AU)

• Processo FAPESP: 18/11954-9 - Redes fluviais como conectoras da paisagem: a qualidade das conexões ripárias influencia os padrões de diversidade de peixes de riachos?
• Beneficiário: Gabriel Lourenço Brejão
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/06033-1 - O papel dos fatores atuais e históricos nos padrões de diversidade beta de peixes em riachos de agroecossistemas
• Beneficiário: Jaquelini de Oliveira Zeni
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/01535-3 - Diversidade taxonômica e funcional da ictiofauna de riachos em microbacias com desmatamento recente
• Beneficiário: Lilian Casatti
• Modalidade de apoio: Auxílio à Pesquisa - Regular