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首页> 外文期刊>Estuarine Coastal and Shelf Science >Response of estuarine meiofauna communities to shifts in spatial distribution of keystone species: An experimental approach
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Response of estuarine meiofauna communities to shifts in spatial distribution of keystone species: An experimental approach

机译：河口淡水动植物群落对主要物种空间分布变化的响应：一种实验方法

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Current climate change directly affects species distribution by altering their physical environment and indirectly by altering interspecific interactions. The geographical distribution of fiddler crabs, keystone species of intertidal estuarine sediments, is supposed to expand poleward as a response to climate change. We experimentally investigate whether the introduction of a new species of fiddler crabs, where another different species already occurs, may affect the structural and functional composition of meiobenthic communities in intertidal areas. In order to disentangle the effect of abundance from species identity, we set up two indoor experiments (substitutive and a partial additive design) manipulating the diversity and density of two keystone species, Leptuca uruguayensis and L. leptodactyla. The results showed that the increase of the diversity keystone species did not impact any measured descriptors of nematode assemblages. By contrast, high density of keystone species, independent of the species, strongly affected the meiofauna total density, and the density of numerically dominant nematode genera. The results did not reveal any functional change in the meiofauna. Our experiments, designed to mimic the indirect effects of range expansion showed that while increasing diversity of functionally redundant keystone species had no effect on preys, increasing density negatively affected the structure of intertidal habitats.
机译：当前的气候变化通过改变物种的自然环境直接影响物种分布，而通过改变种间相互作用间接影响物种分布。作为潮间带河口沉积物的主要物种，招潮蟹的地理分布应该随着气候变化而向极地扩展。我们通过实验研究了引入一种新的提琴蟹物种（其中已经出现了另一种不同物种）是否会影响潮间带中底栖动物群落的结构和功能组成。为了从物种身份中区分出丰度的影响，我们建立了两个室内实验（替代设计和部分加性设计），以操纵两种主要的物种，乌拉圭草和Leptodactyla的多样性和密度。结果表明，多样性梯形菌种的增加并没有影响线虫组合的任何测量指标。相比之下，与物种无关的高密度梯形菌种强烈地影响了鱼类的总密度，以及数量上占优势的线虫属的密度。结果没有显示动物动物的任何功能变化。我们的旨在模拟范围扩大的间接影响的实验表明，虽然增加功能上多余的梯形物种的多样性对猎物没有影响，但增加密度会对潮间带生境的结构产生负面影响。

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