Please use this identifier to cite or link to this item: http://repositorio.ufc.br/handle/riufc/63310
Type: Artigo de Periódico
Title: What governs the functional diversity patterns of fishes in the headwater streams of the humid forest enclaves: environmental conditions, taxonomic diversity or biotic interactions?
Authors: Rodrigues-Filho, Carlos Alberto Sousa
Gurgel-Lourenço, Ronaldo César
Lima, Sergio Maia Queiroz
Oliveira, Edson Fontes de
Sánchez-Botero, Jorge Iván
Keywords: Fish community;Northeastern Brazil;Functional traits;Environmental filters;Taxonomic diversity
Issue Date: 2017
Publisher: Environ Biol Fish
Citation: RODRIGUES-FILHO, Carlos Alberto Sousa et al. What governs the functional diversity patterns of fishes in the headwater streams of the humid forest enclaves: environmental conditions, taxonomic diversity or biotic interactions? Environ Biol Fish, [s. l.], p. 1-10, 2017.
Abstract: The relationship between functional and taxonomic diversity is a major issue in ecology. Biodiversity in aquatic environments is strongly influenced by environmental gradients that act as dispersion and niche barriers. Environmental conditions act as filters to select functional traits, but biotic interactions also play a role in assemblage structure. In headwater streams, the relationship between functional and taxonomic diversity remains unclear. In this study we investigated how environmental conditions, taxonomic diversity and biotic interactions influence the spatial distribution of traits and functional diversity in stream fish species. Standardized sampling of fish species was carried out in 50 m sections of 16 streams located in rainforest enclaves in a semiarid region of Brazil (Caatinga biome). The functional diversity indices displayed different responses to the predictor variables used. Functional richness was mainly influenced by environmental conditions, while functional evenness was mostly determined by taxonomic diversity. On the other hand, functional dispersion was explained by a combination of environmental conditions and taxonomic diversity. The spatial distribution of fish species with the same functional traits was random, indicating that biotic interactions are not a strong predictor in these ecosystems. Channel width, pH and substrate were the most important variables in the spatial distribution of the functional traits of the fish species. Our results suggest that the functional structure of fish assemblages in headwater streams depends mainly on environmental conditions and taxonomic diversity.
URI: http://www.repositorio.ufc.br/handle/riufc/63310
Access Rights: Acesso Aberto
Appears in Collections:DBIO - Artigos publicados em revista científica

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