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Response of sex ratio to timing of breeding in the small cyprinid Gnathopogon caerulescens
Author(s) -
Fujioka Y.,
Kikko T.,
Saegusa J.,
Usuki T.,
Ohtsuka T.
Publication year - 2015
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.12768
Subject(s) - biology , sex ratio , hatching , seasonal breeder , zoology , ecology , demography , population , sociology
The influence of hatching date on the sex ratio of wild Gnathopogon caerulescens was examined. Cohorts reared from eggs collected in the early and middle parts of the spawning season showed almost balanced sex ratios, with female bias in some cohorts. Cohorts born later in the season mostly displayed male bias, and the mean proportion of males later in the season was significantly higher than in early‐ and mid‐season cohorts. These results indicate that the sex ratio of G. caerulescens changes with the time of breeding, increasing along with the ambient water temperature of the lake.