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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The relative importance of substratum characteristics and recruitment in determining the spatial distribution of the fiddler crab Uca uruguayensis Nobili
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The relative importance of substratum characteristics and recruitment in determining the spatial distribution of the fiddler crab Uca uruguayensis Nobili

机译：底层特征和募集对确定招蟹蟹Uca uruguayensis Nobili的空间分布的相对重要性

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摘要

The roles of sediment characteristics and the pattern of recruitment in influencing the abundance of the fiddler crab Uca uruguayensis on Argentinean mudflats were evaluated. The density of adult crabs showed a patchy distribution related to the sediment thickness (depth at which a layer of fossil shells are buried), but the density of juvenile crabs was not coupled with the density of adult crabs. In a field experiment, fossil shells were removed and the density of crabs significantly increased, which demonstrates that the presence of the layer of shells is a structure that may hinder the establishment of burrows. The density of crabs was related to sediment thickness, sediment torque and organic matter content. The importance of each of these variables was different for adult and juvenile crabs, indicating that the distribution of adult crabs may be caused by mechanisms affecting adult crabs themselves and is not established by the recruitment pattern. Moreover, in a field experiment, the density of juveniles decreased when adult crabs were added, and increased when adult crabs were removed. The morphology of burrows was related to sediment characteristics. Burrows were deeper, longer and more voluminous when sediment thickness was high. The volume of burrows decreased with increasing sediment torque. These results suggest that the morphology of burrows is related to the space available and the ease with which sediment it can be excavated. However, an important amount of variability remained unexplained, suggesting the presence of additional environmental variables or behavioural plasticity not considered by this study. Together, these results demonstrate that the spatial heterogeneity in the environmental factors can be translated to a spatial heterogeneity in the distribution of fiddler crabs.
机译：评估了沉积物特征和补充模式对阿根廷泥滩上招蟹蟹Uca uruguayensis的丰度的影响。成年蟹的密度显示出与沉积物厚度（埋有化石壳层的深度）有关的斑片状分布，但幼蟹的密度与成年蟹的密度不相关。在野外实验中，化石壳被去除，螃蟹的密度显着增加，这表明壳层的存在是可能阻碍洞穴形成的结构。螃蟹的密度与沉积物厚度，沉积物扭矩和有机质含量有关。这些变量对于成年蟹和幼蟹的重要性各不相同，这表明成年蟹的分布可能是由影响成年蟹本身的机制引起的，而不是由募集模式确定的。此外，在田间实验中，当添加成年蟹时，幼鱼的密度降低，而当去除成年蟹时，幼鱼的密度增加。洞穴的形态与沉积物特征有关。当沉积物厚度高时，洞穴更深，更长，体积更大。随着沉积物扭矩的增加，洞穴的数量减少。这些结果表明，洞穴的形态与可用空间和挖掘沉积物的难易程度有关。然而，大量的可变性仍然无法解释，表明存在其他环境变量或行为可塑性的存在，这项研究并未考虑到这一点。总之，这些结果表明，环境因素中的空间异质性可以转化为招潮蟹分布中的空间异质性。

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