Organization of fish assemblages in blackwater Atlantic Forest streams

Autor(es)

Esteves, Katharina Eichbaum ^[1] ; Candido Silva, Marcelo Horikoshi ^[2] ; Nanini-Costa, Maressa Helena ^[3] ; Petesse, Maria Letizia ^[2]

Afiliação do(s) autor(es)

^[1] APTA, Inst Pesca, Secretaria Agricultura & Abastecimento Estado Sao, Ctr Pesquisa Recursos Hidr, Ave Francisco Matarazzo 455, BR-05001900 Sao Paulo, SP - Brazil

^[2] APTA, Inst Pesca, Secretaria Agricultura & Abastecimento Estado Sao, Programa Posgrad Aquicultura & Pesca, Ave Francisco Matarazzo 455, BR-05001900 Sao Paulo, SP - Brazil

^[3] Controle Analit Analises Tecn Ltda, Rua Lao 18, 281, BR-06296180 Osasco, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 17, n. 1 2019.
• Citações Web of Science: 0

Resumo

ABSTRACT This study aimed to determine whether fish species occupy different mesohabitats, as defined by specific criteria of substrate types in Atlantic Forest blackwater streams. We sampled fourteen coastal blackwater rivers along the coast of São Paulo State, Brazil, during the low-flow season (June-September/2016). For each stream, we selected three mesohabitat types (sand, leaf-litter and trunks) in a 100 m river stretch. We sampled 41 mesohabitats, 31 of which contained fish, resulting in 15 species. When multivariate analysis of variance (MANOVA) was applied to the mesohabitat abiotic variables, no significant differences were indicated between them. ANOSIM for species density and biomass and Redundancy Analyses (RDAs) for species density, biomass and fish community indexes showed similar patterns of community structure among mesohabitats. Nevertheless, fish biomass, diversity and richness were associated with such unique environmental features as low shading and shallow habitats. The observed dispersion among mesohabitats suggests that these communities are subject to some level of disturbance, which may affect the value of patches as refugia. Thus, the sharing of these mesohabitat patches among species may represent an opportunistic strategy to maximize the use of available resources for these low density populations living in these unique environments. (AU)

• Processo FAPESP: 16/09085-7 - Influência de macro e mesohabitats na distribuição da ictiofauna de rios de água preta da Mata Atlântica
• Beneficiário: Maressa Helena Nanini Costa
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 15/26728-6 - Influência de macro e mesohabitats na distribuição da ictiofauna de rios de água preta da Mata Atlântica
• Beneficiário: Katharina Eichbaum Esteves
• Modalidade de apoio: Auxílio à Pesquisa - Regular