期刊
JOURNAL OF FISH BIOLOGY
卷 78, 期 1, 页码 227-239出版社
WILEY
DOI: 10.1111/j.1095-8649.2010.02854.x
关键词
Acheilognathinae; annual life cycle; ecophysiology; gonado-somatic index; lipid content; somatic condition
资金
- Czech Science Foundation [206/09/1163]
- Leverhulme Trust
The seasonal dynamics of biological traits in a population of European bitterling Rhodeus amarus from a small river in central Europe (River Kyjovka, Czech Republic) were investigated from April 2007 to March 2008. The reproductive season lasted from early April to mid-June, with a peak in late April when > 50% of females possessed ripe eggs in their ovaries. The sex ratio was female-biased, with a higher bias following the peak in reproduction, suggesting higher mortality of males than females over the reproductive period. The population was effectively annual, with a major decrease in adult fish abundance at the end of the reproductive period. Highest relative lipid content and condition factor were observed in February, both decreasing with an increase in investment into gonads. Seasonal dynamics in somatic condition, relative lipid content and gonad mass, and their comparison with other R. amarus populations, suggest that the study population allocated a disproportionally high level of resources to reproduction. (C) 2010 The Authors
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