Life-History traits of Hollandichthys multifasciatus (Eigenmann & Norris, 1900) (Characiformes: Characidae) in coastal Atlantic Forest blackwater streams from Southeastern Brazil

Autor(es)

Vinicius de Carvalho Cardoso ^[1] ; Katharina Eichbaum Esteves ^[2]

Afiliação do(s) autor(es)

^[1] Secretaria da Agricultura e Abastecimento do Estado de São Paulo. Agência Paulista de Tecnologia dos Agronegócios. Instituto de Pesca - Brasil

^[2] Secretaria da Agricultura e Abastecimento do Estado de São Paulo. Agência Paulista de Tecnologia dos Agronegócios. Instituto de Pesca - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Papéis Avulsos de Zoologia (São Paulo); v. 62, 2022-05-16.

Resumo

Abstract Ecological and life history traits have been used to understand the basic ecology of fishes. This study aimed to examine the existence of plasticity in life history traits of populations of Hollandichthys multifasciatus in ten blackwater streams. This is an inseminating Characidae, endemic to the Atlantic coastal drainages of Brazil. Different aspects of the life-history of the species, such as mean length, sex ratio, absolute and relative fecundity, gonadosomatic index, condition factor, length-weight relationship and the growth parameter (b) of 185 specimens were studied during the period of low precipitation (June-September). Fish samples were obtained along a 100 m stretch of each stream, and some habitat variables recorded. ANOVA and Kruskal-Wallis tests indicated a similarity in most of the analyzed traits, with exception of the mean length of immatures, Gonadosomatic Index of mature males and condition factor of immatures and mature adults. Also, slope tests of the length-weight relationship were significantly different for immatures. The observed differences were attributed to heterogeneity in food availability and/or other site-specific factors, which may influence growth and/or breeding aspects among the studied localities. The approach used herein may improve understanding of trait plasticity under natural conditions, helping to understand fish-community responses to anthropogenic changes. (AU)

• 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