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首页> 外文期刊>Aquatic Biology >Geographic distribution of two mussel species and associated assemblages along the northern Argentinean coast
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Geographic distribution of two mussel species and associated assemblages along the northern Argentinean coast

机译：阿根廷北部沿海地区两种贻贝物种及相关组合的地理分布

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ABSTRACT: Ecosystem engineers can modify habitat, creating structural microhabitats. This structural complexity can affect species richness. Marine ecosystem engineers are able to produce local effects in combination with environmental variables (e.g. to create more humid habitat during low tides). We tested the hypotheses that if there is a relationship between mussel morphology and environmental factors, mussels would be larger at warmer than at cooler locations, and in areas where 2 species of mussels overlap, size and biomass will decrease and density will increase. At a smaller scale, we predicted that there is a relationship between the assemblage structure and hardness of the substratum and sediment content of a mussel bed. Using a nested design, we measured density, biomass and size of 2 species of mussels, Brachidontes rodriguezii and Perumytilus (Brachidontes) purpuratus, and diversity of species associated with mussel beds at 2 rocky intertidal sites at each of 4 shores along the northern Argentinean coast. These variables were correlated with oceanographic conditions and local characteristics. Significant correlations were found between intertidal assemblages and local factors. The largest specimens of B. rodriguezii and P. purpuratus were found at the warmer shores. In areas where they overlapped, size, biomass and density of P. purpuratus were lower, although B. rodriguezii did not change. The mean abundance of invertebrates associated with a mussel bed showed significant differences among shores. These 2 species of mytilids coexist over a small area, and although these species are very similar in their biological and ecological function, the fauna associated with their matrices are very different.
机译：摘要：生态系统工程师可以修改栖息地，从而创造结构上的微生境。这种结构上的复杂性会影响物种的丰富性。海洋生态系统工程师能够结合环境变量产生局部效应（例如，在退潮时创造更多的潮湿栖息地）。我们检验了以下假设：如果贻贝的形态与环境因素之间存在关联，则贻贝在较热的地方会比在较凉的地方大，并且在两种贻贝重叠的区域，大小和生物量会减少，密度会增加。在较小的规模上，我们预测组合结构和底层硬度与贻贝床的沉积物含量之间存在关系。使用嵌套设计，我们测量了2种贻贝 Brachidontes rodriguezii 和 Perumytilus （ Brachidontes ）紫菜的密度，生物量和大小，并且在阿根廷北部海岸的4个海岸中的每个海岸的2个岩石潮间带地点，与贻贝床有关的物种多样性。这些变量与海洋条件和当地特征相关。发现潮间带组合与局部因素之间存在显着相关性。 B的最大样本。 rodriguezii 和 P。在温暖的海岸发现紫癜。在它们重叠的区域，i P的大小，生物量和密度。尽管 B，但紫癜的发病率较低。 rodriguezii 不变。与贻贝床相关的无脊椎动物的平均丰度在海岸之间显示出显着差异。这两种Mytilids物种共存于一个小区域，尽管这些物种的生物学和生态功能非常相似，但与它们的基质相关的动物却非常不同。

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