caa a22 4500 606227172 CHVBK 20210128101157.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s10641-015-0423-3 doi (NATIONALLICENCE)springer-10.1007/s10641-015-0423-3 Microhabitat segregation and fine ecomorphological dissimilarity between two closely phylogenetically related grazer fishes in an Atlantic Forest stream, Brazil [Elektronische Daten] [Rafael Leitão, Jorge Sánchez-Botero, Daniele Kasper, Victor Trivério-Cardoso, Carolina Araújo, Jansen Zuanon, Érica Caramaschi] Habitat segregation is considered the most prevalent resource-partitioning mechanism for stream fishes and the species morphology can be a strong predictor of their spatial distribution. However, most studies addressing morphology-habitat relationships have defined the space in physiognomically homogeneous units (i.e., mesohabitat), probably not detecting segregation among several closely related species. Here we investigated the ecomorphology and the use of habitat in a fine spatial scale (i.e., microhabitat) by two closely phylogenetically related grazer fishes (the loricariids Parotocinclus maculicauda and Hisonotus notatus), syntopic in an Atlantic Forest stream. We conducted standardized underwater observations in two 50m long stream sections differing in canopy condition, totaling 273 individual microhabitat records. We clearly detected microhabitat segregation between the species. In both sample sites, H. notatus remained near the stream banks and closer to shelters, while P. maculicauda predominantly occurred in more hydrodynamic microhabitats, facing higher focal current velocities and water turbulence. Differences in focal elevation and water depth (i.e., vertical segregation) were exclusively detected in the deforested site. The spatial segregation was congruent with slight interspecific morphological differences, being in accordance with hypotheses about form-function relationships previously reported for fishes. Given that the diel activity and diet of these grazer species were strongly overlapping, we believe that the observed microhabitat segregation favors resource partitioning between P. maculicauda and H. notatus, facilitating their coexistence in high abundances in the studied system. This study illustrates how the assessment of fine-tuned ecological processes can provide subsidy to management strategies aiming the conservation of tropical stream biodiversity. Springer Science+Business Media Dordrecht, 2015 Habitat nationallicence Resource partitioning nationallicence Limiting similarity nationallicence Ecomorphology nationallicence Loricariids nationallicence Leitão Rafael Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut Sánchez-Botero Jorge Laboratório de Ecologia, Departamento de Biologia, Centro de Ciências, Universidade Federal do Ceará, Campus do Pici, Bloco 906, 60455-970, Fortaleza, CE, Brazil aut Kasper Daniele Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Petrópolis, 69080-971, Manaus, AM, Brazil aut Trivério-Cardoso Victor Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut Araújo Carolina Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut Zuanon Jansen Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Petrópolis, 69080-971, Manaus, AM, Brazil aut Caramaschi Érica Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut Environmental Biology of Fishes Springer Netherlands 98/9(2015-09-01), 2009-2019 0378-1909 98:9<2009 2015 98 10641 https://doi.org/10.1007/s10641-015-0423-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-015-0423-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Leitão Rafael Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Sánchez-Botero Jorge Laboratório de Ecologia, Departamento de Biologia, Centro de Ciências, Universidade Federal do Ceará, Campus do Pici, Bloco 906, 60455-970, Fortaleza, CE, Brazil aut NATIONALLICENCE 700 1- Kasper Daniele Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Petrópolis, 69080-971, Manaus, AM, Brazil aut NATIONALLICENCE 700 1- Trivério-Cardoso Victor Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Araújo Carolina Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Zuanon Jansen Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, Petrópolis, 69080-971, Manaus, AM, Brazil aut NATIONALLICENCE 700 1- Caramaschi Érica Laboratório de Ecologia de Peixes, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowski, Cidade Universitária, 21941-541, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/9(2015-09-01), 2009-2019 0378-1909 98:9<2009 2015 98 10641