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首页> 外文期刊>Archiv fur Hydrobiologie >The influence of micro-habitat segregation on size assortative pairing in Gammarus pulex (L.) (Crustacea, Amphipoda)
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The influence of micro-habitat segregation on size assortative pairing in Gammarus pulex (L.) (Crustacea, Amphipoda)

机译：微小栖息地的分离对伽玛象（L。）（甲壳纲，两栖类）的大小分类配对的影响

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Hypotheses to explain assortative pairing in gammarids (Amphipoda) include size-related habitat segregation and male-male competition. We investigated the influence of micro-habitat heterogeneity on size-assortative pairing in Gammarus pulex, using field-based studies and complementary laboratory-based studies. Firstly, we studied the distribution of males and females of different size and the intensity of size-assortative pairing in micro-habitats differing in particle size at three different study sites. In one site both males and females distributed among micro-habitats in relation to their size, with larger individuals in vegetation and smaller individuals in fine gravel. In a second site, there was no difference in the size of both males and females between two micro-habitats of different particle size, whereas in a third site with two micro-habitats of different particle size the difference was significant for males, but not for females. However, size-assortative pairing was significant within each micro-habitat in each study site. In the first site, pooling data from the three microhabitat subsamples resulted in a higher correlation coefficient between male size and female size, compared to the ones obtained within each micro-habitat, whereas no such difference was observed for the two other sites. Secondly, in experimental conditions, we compared the strength of size-assortative pairing under combinations of both heterogeneous and homogeneous environmental conditions and male-biased or female-biased sex ratios. Size assortative pairing was significant only when the sex-ratio was male-biased. Environmental heterogeneity had no effect on size-assortative pairing. We conclude that male:male competition is the major determinant of size-assortative pairing in G. pulex and that micro-habitat segregation plays only a marginal, if any, role. [References: 39]
机译：解释γ（两栖动物）中配对配对的假说包括与尺寸有关的栖息地隔离和雄雄竞争。我们使用基于田野的研究和基于实验室的补充研究，调查了微栖息地异质性对γ-粉虱大小-大小配对的影响。首先，我们在三个不同的研究地点研究了不同大小的雄性和雌性的分布以及在大小不同的微生境中大小-配对的强度。在一个地方，雄性和雌性都按照其大小分布在微生境中，其中较大的个体为植被，较小的个体为细砾石。在第二个站点中，两个具有不同粒径的微生境之间的雄性和雌性大小均无差异，而在第三个站点中，两个具有不同粒度的微生境中，雄性的差异显着，但无差异对于女性。但是，在每个研究地点的每个微生境中，大小相关配对都很重要。在第一个站点中，与在每个微生境中获得的相关性相比，从三个微生境子样本中收集的数据导致男性大小和女性大小之间的相关系数更高，而在其他两个站点中未观察到这种差异。其次，在实验条件下，我们比较了在异质和均质环境条件以及男性偏向或女性偏向性别比的组合下，尺寸分类配对的强度。仅当性别比为男性偏见时，大小配对才有意义。环境异质性对大小-分类配对没有影响。我们得出的结论是，雄性对雄性竞争是G. pulex中大小-配对配对的主要决定因素，并且微栖息地的分离仅起边际作用（如果有的话）。 [参考：39]

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