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首页> 外文期刊>Archiv fur Hydrobiologie >Life history traits of pumpkinseed (Lepomis gibbosus) populations introduced into warm thermal environments
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Life history traits of pumpkinseed (Lepomis gibbosus) populations introduced into warm thermal environments

机译：引入温暖热环境的南瓜籽（Lepomis gibbosus）种群的生活史特征

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Life history theory predicts that ectotherms living in warm thermal environments should mature early because of fast juvenile growth, but it is unclear whether such early maturity will occur in the absence of conditions that promote fast juvenile growth. To assess this possibility and to determine the effect of warm thermal regimes on body size at maturity, we compared the growth and life history patterns of three populations of pumpkinseed (Lepomis gibbosus) introduced into warm, Mediterranean waterbodies in southern France with native populations living in cool thermal regimes in Ontario, Canada. Growth and life history traits of the French populations were determined from monthly samples collected from May to September. Mean age at maturity in the French populations ranged from 1.3-2.3 years, and was significantly earlier than that of populations inhabiting Ontario lakes. Length at age 2, an indicator of the juvenile growth rate, was not significantly different between the French and Ontario populations, and the French populations matured significantly earlier than Ontario lake populations even when juvenile growth was taken into account. Length at maturity in the French populations was also significantly smaller. and although there was no significant difference between the French and Ontario populations in mean GSI, the results of a previous reproductive allocation experiment suggest that French populations have a longer breeding season, and greater reproductive effort than Ontario pumpkinseeds. The earlier maturity of French pumpkinseeds could be a direct physiological effect of the warm thermal environment, but factors other than thermal regime may be contributing to the difference in life history traits between the French and Ontario populations. [References: 60]
机译：生命史理论预测，由于青少年的快速成长，生活在温暖热环境中的放热应该早日成熟，但是尚不清楚在没有促进少年快速成长的条件下是否会发生这种早期成熟。为了评估这种可能性并确定温暖的热量制度对成熟时体型的影响，我们比较了法国南部温暖的地中海水域中引入的三个南瓜子种群（Lepomis gibbosus）的生长和生活史模式，以及居住在法国的地中海种群。加拿大安大略省凉爽的热态。法国人口的生长和生活史特征是从5月至9月每月收集的样本中确定的。法国人口的平均成年年龄为1.3-2.3岁，明显早于安大略湖的人口。法国和安大略种群在2岁时的长短指示了少年的生长速度，并没有显着差异，即使考虑到少年的生长，法国种群的成熟时间也比安大略湖的种群早得多。法国人口的成熟期长度也明显较小。尽管法国人和安大略人的平均GSI值没有显着差异，但先前的生殖分配实验结果表明，法国人的繁殖季节比安大略省南瓜子更长，繁殖力更大。法国南瓜籽的较早成熟可能是温暖的热环境的直接生理影响，但除热机制外的其他因素可能是造成法国人和安大略人之间生活史特征差异的原因。 [参考：60]

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