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Life-history strategies associated to reproduction of three Hyphessobrycon species (Characidae) in lentic environments of upper Paraná River basin

Authors :
Cristina da Silva Gonçalves
Ursulla Pereira Souza
Fabio Cop Ferreira
Alexandre Peressin
Francisco Manoel de Souza Braga
Source :
Acta Limnologica Brasiliensia, Vol 25, Iss 4, Pp 398-405 (2013)
Publication Year :
2013
Publisher :
Associação Brasileira de Limnologia, 2013.

Abstract

AIM: Life-history strategies in fish include essential parameters related to offspring survivorship, fecundity and time of reproduction, which represent adaptive traits that enable a species to deal with spatial and temporal variability of abiotic conditions. This study aimed to compare reproductive traits associated to life-history theory for three Hyphessobrycon species from two lentic environments (four natural oxbow lakes and a man-made reservoir) of Mogi Guaçu River, upper Paraná River basin. METHODS: Specimens were collected with four minnow traps between August 2005 and July 2006 to cover dry and wet seasons (three samples in each season, and three samples in each environment). RESULTS: Reproductive strategy of H. bifasciatus and H. eques, which predominated in the oxbow lakes, differed from H. anisitsi in the reservoir. Hyphessobrycon bifasciatus and H. eques were single spawners with lower fecundity and size at sexual maturity, but invested more in number of eggs per body gram, while H. anisitsi was a multiple spawner species with higher fecundity, larger size at sexual maturity and body size. CONCLUSIONS: In seasonal environments, single spawners are synchronized with the floods to maximize juvenile survivorship, while reservoirs harbors multiple spawners’ fish due to the reduced fluctuation between high and low floods resulting from dam operation. Therefore, the seasonal condition in the oxbow lakes due to the flood pulse favored single spawners’ tactic, as showed by H. bifasciatus and H. eques. In contrast, the multiple spawning of H. anisitsi seems to be related to the more stable environmental condition throughout the year provided by the dam. Life-histories reported herein to Hyphessobrycon species must be common to other characid fishes inhabiting similar environments.

Details

Language :
English
ISSN :
2179975X
Volume :
25
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Acta Limnologica Brasiliensia
Publication Type :
Academic Journal
Accession number :
edsdoj.343f8c228c4768876496f5736a7b0a
Document Type :
article
Full Text :
https://doi.org/10.1590/S2179-975X2013000400005