Fish complementarity is associated to forests in Amazonian streams

Author(s)

Bordignon, Carolina Rodrigues ^[1] ; Casatti, Lilian ^[1] ; Perez-Mayorga, Maria Angelica ^[1] ; Teresa, Fabricio Barreto ^[2] ; Brejao, Gabriel Lourenco ^[1]

Affiliation

^[1] Univ Estadual Paulista UNESP, Dept Zool & Bot, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[2] Univ Estadual de Goias, Unidade Univ Ciencias Exatas & Tecnol, BR-75132903 Anapolis, Go - Brazil

• Document type: Journal article
• Source: Neotropical Ichthyology; v. 13, n. 3, p. 579-590, JUL-SEP 2015.
• Web of Science Citations: 11

Abstract

The functional structure of communities is commonly measured by the variability in functional traits, which may demonstrate complementarity or redundancy patterns. In this study, we tested the influence of environmental variables on the functional structure of fish assemblages in Amazonian streams within a deforestation gradient. We calculated six ecomorphological traits related to habitat use from each fish species, and used them to calculate the net relatedness index (NRI) and the nearest taxon index (NTI). The set of species that used the habitat differently (complementary or overdispersed assemblages) occurred in sites with a greater proportion of forests. The set of species that used the habitat in a similar way (redundant or clustered assemblages) occurred in sites with a greater proportion of grasses in the stream banks. Therefore, the deforestation of entire watersheds, which has occurred in many Amazonian regions, may be a central factor for the functional homogenization of fish fauna. (AU)

• FAPESP's process: 10/17494-8 - Terra firme stream fish from Rio Machado Basin, RO
• Grantee: Lilian Casatti
• Support Opportunities: Regular Research Grants