Feeding and reproductive patterns of Astyanax intermedius in a headwater stream of Atlantic Rainforest

Autor(es)

Souza, Ursulla P. ^[1] ; Ferreira, Fabio C. ^[2] ; Carmo, Michele A. F. ^[3] ; Braga, Francisco M. S. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Santa Cecilia, Programa Posgrad Sustentabilidade Ecossistemas Co, Rua Cesario Mota 08, BR-11045040 Santos, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Ciencias Mar, BR-11030400 Santos, SP - Brazil

^[3] Univ Santa Cecilia, Programa Posgrad Sustentabilidade Ecossistemas Co, Lab Pesquisa Recursos Pesqueiros, BR-11045040 Santos, SP - Brazil

^[4] Univ Estadual Paulista, Dept Zool, Inst Biociencias, BR-13506910 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 87, n. 4, p. 2151-2162, DEC 2015.
• Citações Web of Science: 1

Resumo

ABSTRACT In this paper, we determined diet composition, reproductive periodicity and fecundity of Astyanax intermedius in a headwater stream of a State Park of an Atlantic rainforest. We also evaluated the influence of rainfall, water temperature and fish size on niche width and niche overlap. Sampling was conducted monthly throughout one year in the Ribeirão Grande stream, southeastern Brazil. Diet consisted of 31 food items with equal contribution of allochthonous and autochthonous items. Females were larger than males, and the mean sizes at first maturation were 4.44 cm and 3.92 cm, respectively. Based on 212 pairs of mature ovaries, the number of oocytes per female ranged from 538 to 6,727 (mean = 2,688.7). Niche width and niche overlap were not related to rainfall nor water temperature and only niche width increased with fish size, suggesting that as fish grow, more items are included in diet. Our results suggested that A. intermedius fit as a typical opportunistic strategist which may explain the prevalence of this species in several isolated headwater basins of vegetated Atlantic forested streams where food resources are abundant and distributed throughout the year. (AU)

• Processo FAPESP: 04/12669-3 - Biologia alimentar e reprodutiva nas comunidades de peixes do Rio Passa Cinco (SP)
• Beneficiário: Giulianna Rondineli Carmassi
• Modalidade de apoio: Bolsas no Brasil - Mestrado