Fish diversity in tidepools: assembling effects of environmental heterogeneity
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Tidepools are considered ecosystems of high interchangeable fish biota. However, natural and anthropogenic actions that alter negatively marine ecosystems functioning (e.g., algal exploitation) are causing homogenization of fish biodiversity. Here, we describe the functional and taxonomic assembling of fishes in beach rocks of northeastern Brazil. Traits of fish species were retrieved from Fishbase and beta diversity was assessed by the dispersion of abundance, presence-absence and functional diversity in the multivariate space. We explained spatial-temporal variation in: alpha diversity, taxonomic and functional community composition; as well as temporal variation in functional, beta and gamma diversities. We found an annual stability in fish diversity and composition, and that fish biota was assembled mainly per tidepools’ depths. Substrate heterogeneity was correlated to depth, highlighting the role of local features as filters to organize the fish fauna vertically in tidepools, especially a cultivation of algae that influences the local assembling. We also highlight the uniqueness status of beach rocks in the Brazilian tropical region.
KeywordsCoral reef fish Functional traits Beta diversity Community organization Gracilaria spp. Brazilian western Atlantic
We are thankful to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) by student’s scholarship for the first author, and other funding to this Project. Laboratório de Ecologia Aquática, Laboratório de Ecologia Pesqueira, Labomar (both from Universidade Federal do Ceará) to subside our samples and logistics and FUNCAP (Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico) for financial support. IBAMA (Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis) and ICMBio (Instituto Chico Mendes de Conservação da Biodiversidade), the federal regulatory agencies considering animal care in Brazil, support non-invasive approaches for fish census, such as the employed here. We thus declare that there is no conflict considering animal care or ethics committee.
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