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首页> 外文期刊>Marine ecology progress series >Effects of mussels on competitively inferior species: competitive exclusion to facilitation
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Effects of mussels on competitively inferior species: competitive exclusion to facilitation

机译：贻贝对竞争劣等物种的影响：促进竞争的排斥

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Intertidal mussel species often provide a secondary substrate for competitively inferior species, while excluding them from the primary substrate. To evaluate the net effect, we conducted field experiments that specifically focused on interactions between mussels Septifer virgatus (Mieg-mann) and algae species. Mussels affected the abundance of 7 algal species differentially, with effects being positive, neutral, or negative. The red alga Porphyra yezoensis grew more abundantly on mussel shells than on rock surfaces. Mussels facilitated recruitment intensity of this species, resulting in increased adult cover on the shells. In contrast, the green alga Monostroma angicava grew less abundantly on mussel shells than on rock surfaces. Mussel shells did not modify recruitment intensity of this alga, but did inhibit its frond growth, and would thus seem to reduce adult cover. Modifications of grazer density by the mussels did not affect either of these algae species. The results indicate that the net effect of mussels on competitively inferior species is not grazer-mediated, and varies from species to species.
机译：潮间贻贝物种通常为劣质竞争物种提供次要底物，同时将其排除在主要底物之外。为了评估净效果，我们进行了田间实验，专门针对贻贝贻贝维加斯（Mieg-mann）和藻类之间的相互作用。贻贝对7种藻类的丰度有不同的影响，其影响为阳性，中性或阴性。赤藻红藻在贻贝壳上的生长比在岩石表面的丰富。贻贝促进了该物种的募集强度，导致壳上成虫的覆盖增加。相比之下，贻贝壳上的绿藻Monostroma angicava生长不足，而不是岩石表面上。贻贝的壳没有改变这种藻的募集强度，但是抑制了其藻类的生长，因此似乎减少了成虫的覆盖。贻贝对放牧者密度的改变不影响这两种藻类中的任何一种。结果表明，贻贝对竞争劣等物种的净效应不是由放牧者介导的，并且因物种而异。

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