Popularion biology of abdominant fish species of the Santa Bárbara river, a tributary of the Nova Avanhandava reservoir (low Tietê river, São Paulo State, Brazil)


Autoria(s): Vidotto-Magnoni, Ana Paula; Carvalho, Edmir Daniel
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

11/05/2009

Resumo

The aim of this study is to characterize some population biology parameters of P. squamosissimus, A. altiparanae and S. maculatus, the dominant fish species of the Santa Bárbara river, a tributary of the Nova Avanhandava reservoir, low Tietê river. Fish samplings were performed monthly between September/2002 and August/2003, using gill nets with different mesh sizes. Females of all species have larger standard lengths than males (Mann-Whitney, p < 0.0001), and are more frequent in superior size classes (Kolmogorov-Smirnov, p < 0.0001). All populations presented isometric growth, but differences between males and females were observed. Only P. squamosissimus presented a gender ratio different from 1:1, with a higher proportion of males (1:2, X2, p < 0.05). The onset of gonadal maturation occurs at 15 cm in P. squamosissimus, 9 cm in S. maculatus and at 8.9 cm in A. altiparanae. In all species populations, the adults predominate over juveniles. The allometric condition factor (K) of P. squamosissimus and S. maculatus presented higher values in the periods from March-May and June-August, and A. altiparanae in the period from March-May (Kruskal-Wallis, p < 0.05). These results indicate that the populations successfully exploit the lentic environment, and present life cycle tactics adapted to their particular means of environment occupation.

Formato

55-63

Identificador

http://dx.doi.org/10.4025/actascibiolsci.v31i1.650

Acta Scientiarum - Biological Sciences, v. 31, n. 1, p. 55-63, 2009.

1679-9283

1807-863X

http://hdl.handle.net/11449/130685

10.4025/actascibiolsci.v31i1.650

2-s2.0-65449122306

2-s2.0-65449122306.pdf

Idioma(s)

eng

Relação

Acta Scientiarum: Biological Sciences

Direitos

openAccess

Palavras-Chave #Astyanax altiparanae #Plagioscion squamosissimus #Population biology #Reservoir #Serrasalmus maculatus #Tietê river #Age distribution #Body height #Brazil #Controlled study #Female #Fish #Gonad development #Growth rate #Life cycle assessment #Male #Nonhuman #Population abundance #Population biology #Reservoir #River #Seasonal variation #Sex difference #Sex ratio #Species comparison #Species dominance #Water supply #Serrasalmus
Tipo

info:eu-repo/semantics/article