Abstract
This study aimed to characterize species composition and abundance of fish assemblages of low-order streams of the Machado River Basin and to identify the main environmental factors associated to fish assemblages along the elevational gradient. Fishes were collected by seine and dip nets, along an 80-m stretch of 71 streams. In each site, we recorded physical, chemical, and land–water ecotone variables. We collected 22,702 specimens of 91 species. Species richness and abundance varied negatively with elevation. Ordination and similarity analyses detected that streams located in higher and middle elevation ranges differed in species composition from those in the lower elevation range. Almost one-third of the recorded species were selected as indicator species. Species of the families Trichomycteridae, Cichlidae, Gymnotidae, and Characidae were closely associated with the land–water ecotone and structural characteristics of lower elevation range, whereas several other Characidae species were more abundant in middle elevation range, where aquatic vegetation cover and conductivity values were higher. By assuming that composition and relative abundance of fish respond to environmental changes, hydrological characteristics may be viewed as environmental filters for stream assemblages by ultimately selecting the pool of species able to reach for specific elevation ranges and meet their biological requirements.
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Acknowledgements
This study is a part of the Thesis of I. D. da Costa in the Programa de Pós-Graduação em Ecologia e Evolução, Universidade do Estado do Rio de Janeiro. Monica P. de Araújo of the Universidade Federal do Rio de Janeiro and undergraduate students of the Fundação Universidade Federal de Rondônia assisted with designing Fig. 1 and the fieldwork, respectively. We are grateful to Dr. Francisco Langeani of the Universidade Estadual Paulista, campus de São José do Rio Preto, MSc. Willian Ohara of the Universidade de São Paulo, and Dr. João Alves de Lima Filho of the Universidade Federal de Rondônia for their help with taxonomic identification of the specimens, Dr. Lilian Casatti of the Universidade Estadual Paulista, campus de São José do Rio Preto, for providing suggestions on an earlier version of the manuscript and financial support (FAPESP: 2010/17494-8), and two anonymous reviewers for their helpful comments and suggestions. License for fish collections was provided by the Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA # 4355-1).
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Costa, I.D., Petry, A.C. & Mazzoni, R. Responses of fish assemblages to subtle elevations in headwater streams in southwestern Amazonia. Hydrobiologia 809, 175–184 (2018). https://doi.org/10.1007/s10750-017-3463-1
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DOI: https://doi.org/10.1007/s10750-017-3463-1