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首页> 外文期刊>Marine ecology progress series >The clam Macoma balthica prevents in situ growth of microalgal mats: implications for meiofaunal assemblages
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The clam Macoma balthica prevents in situ growth of microalgal mats: implications for meiofaunal assemblages

机译：蛤MacMacoma balthica防止了微藻垫的原位生长：对金牛群的影响

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The tellinid clam Macoma balthica (L.), a key member of numerous marine temperate soft-bottom communities, was used in laboratory experiments designed to evaluate its impact on developing microalgal mats and meiobenthic assemblages. Experimental jars (100 ml, 33 cm~2) were filled with azoic sediment, seeded with bivalves at various densities, placed in a large outdoor water tank with a constant flow of brackish water and left for 65 d. The bivalves efficiently kept the sediment surface clean of microalgal mats. At the end of the experiment, jars without clams were on average 99 % covered by algae, while jars with clams (300 to 4800 ind. m~(-2)) had less than 10 % cover on average. There was a highly significant positive correlation between algal cover and the number of individuals belonging to the major meiofaunal taxa, i.e. Nematoda (r~2 = 0.61, p < 0.001) and Copepoda (r~2 = 0.79, p < 0.001). In containers with high clam densities (4800 ind. m~(-2)), numbers of nematodes were significantly lower than in containers with low clam densities (300 and 600 ind. m~(-2)), but no such difference was found for the copepods. Multidimensional scaling ordination indicated 3 distinct significantly different assemblages (ANOSIM, p < 0.01) of nematodes in jars with clam density of 0, 300 and 4800 ind. m~(-2), while assemblage structure of copepods was only significantly different between jars with or without clams. In a separate experiment, we tested if the size of the clam and an initial organic enrichment of the sediment would affect the colonizing meiofauna. The results indicated that small bivalves also effectively prevented algal formation and that the development of meiobenthic communities depended on initial organic matter in the sediment. We concluded that indirect effects of Macoma balthica on the assemblage structure of meiobenthos by hindering development of microalgal mats are much larger than any direct effects.
机译：in蛤Mac Macoma balthica（L.）是众多海洋温带软底群落的重要成员，已用于实验室实验，旨在评估其对发育微藻垫和中底栖动物的影响。将装有偶氮沉淀物的实验罐（100 ml，33 cm〜2）装满，用不同密度的双壳类种子播种，将其放入带有恒定咸水流的大型室外水箱中，放置65 d。双壳类有效地使微藻垫保持沉积物表面清洁。在实验结束时，没有蛤s的罐子平均被藻类覆盖，而有蛤with的罐子（300至4800 ind。m〜（-2））的平均覆盖率不到10％。藻类覆盖度与主要的动代植物分类群个体数量（即线虫（r〜2 = 0.61，p <0.001）和Co足类动物（r〜2 = 0.79，p <0.001））之间存在极显着的正相关。在高蛤密度（4800 ind。m〜（-2））的容器中，线虫的数量显着低于低蛤密度（300和600 ind。m〜（-2））的容器，但差异不大。被发现为co足类动物。多维缩放排序指示了在罐子中蛤的线虫的密度分别为0、300和4800 ind的3种明显不同的线虫组合（ANOSIM，p <0.01）。 m〜（-2），而pe足类的装配结构在有或没有蛤的广口瓶之间只有明显的不同。在一个单独的实验中，我们测试了蛤size的大小和沉积物的初始有机富集是否会影响定居的鱼类。结果表明，小双壳类动物也能有效防止藻类形成，中底栖动物群落的发育取决于沉积物中的初始有机质。我们得出的结论是，Macoma balthica通过阻碍微藻垫的发育对鱼尾鱼的组装结构的间接作用远大于任何直接作用。

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