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首页> 外文期刊>Zoological Science >Comparative Reproductive Effort and Fecundity in the Spider Crabs, Leurocyclus tuberculosus and Libinia spinosa (Majoidea, Brachyura)
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Comparative Reproductive Effort and Fecundity in the Spider Crabs, Leurocyclus tuberculosus and Libinia spinosa (Majoidea, Brachyura)

机译：蜘蛛蟹，Leurocyclus tuberculosus和Spinus Libinia spinosa（Majoidea，Brachyura）的比较生殖力和生殖力

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摘要

A comparative analysis of reproductive effort, fecundity, and egg weight was conducted in two species of spider crabs, Leurocyclus tuberculosus and Libinia spinosa, during one-year period. Ovigerous females were collected from Patagonia-Argentina (42 degrees 56'S, 64 degrees 21'W) and were measured (CW = carapace width). Each egg brood was weighed, dried and the number of eggs (F = fecundity) counted. Scatterplots of relative fecundity (RF = F/CW) were submitted to regression analyses. Mean F and RF was calculated for each season to assess seasonal variation of reproductive intensity. Mean F was 35,000 eggs in L. tuberculosus and 30,000 eggs in L. spinosa, with these values being intermediate in comparison with other Majoidea. The RF was approximately 18% higher in L. tuberculosus that presented an average dry weight egg 45% less than L. spinosa. Although in both species F showed a positive correlation with CW, less than the 20% of the variation in the number of eggs could be explained by female's size, suggesting there are other factors that influence F. The proportion of body energy devoted to reproduction (reproductive effort), exhibited significant differences between species. In Leurocyclus tuberculosus reproductive activity is significantly different along the 12-month suggesting that the conditions for 'optimal' egg production change-throughout the year. In Libinia spinosa mean fecundity did not reveal significant differences over seasons. These results are central in studies of life-history theory and in the development of life-history models, as it is directly related to energy allocation and partitioning.
机译：在一年的时间里，对两种蜘蛛蟹（Leurocyclus tuberculosus和Libinia spinosa）的生殖力，繁殖力和卵重进行了比较分析。从巴塔哥尼亚-阿根廷（42度56'，64度21'W）收集雌雄并进行测量（CW =甲壳宽度）。称量每个卵巢，干燥并计数卵的数量（F =繁殖力）。相对生殖力散点图（RF = F / CW）已提交回归分析。计算每个季节的平均F和RF，以评估繁殖强度的季节性变化。均值F在结核杆菌中为35,000个卵，在棘刺乳中为30,000个卵，与其他Majoidea相比，这些值处于中等水平。结核杆菌的RF大约高出18％，结核干蛋的平均干重比刺藻少45％。尽管在这两个物种中F都与CW呈正相关，但是卵的数量变化的不到20％可以由雌性的大小来解释，这表明还有其他因素影响F.专门用于繁殖的体能比例（生殖力），在物种之间表现出显着差异。在12个月的结核菌中，结核菌的生殖活动明显不同，这表明全年“最佳”产卵条件发生了变化。在利比里亚刺藻中，平均繁殖力没有随季节变化显示显着差异。这些结果对于生命历史理论的研究和生命历史模型的发展至关重要，因为它与能量分配和分配直接相关。

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