Effect of temperature changes on the reproductive cycle of roach in Lake Geneva from 1983 to 2001
作者： C. Gillet , P. QueTin
DOI: 10.1111/J.1095-8649.2006.01123.X
关键词:
摘要: In Lake Geneva, the surface water temperature has increased by 1° C over 20 years probably as a result of climate change. The effects changes in on reproductive cycle roach Rutilus rutilus were assessed 19 year survey. Over time, spawning tended to begin earlier. consequences two different stages female cycle: development ovaries from beginning autumn ovulation, and onset period. was studied for 7 consecutive October June. From 1 spawning, it possible assess gonado-somatic index (I G ) females terms time expressed sum degree-days. correlation between I degree-days +0·97. period Geneva triggered thermal threshold (median range 190 ± 10 15 previous days). April, warming accelerated gonads, then May, that occurred
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