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首页> 外文期刊>Estuarine Coastal and Shelf Science >Two faces of agricultural intensification hanging over aquatic biodiversity: The case of chironomid diversity from farm ponds vs. natural wetlands in a coastal region
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Two faces of agricultural intensification hanging over aquatic biodiversity: The case of chironomid diversity from farm ponds vs. natural wetlands in a coastal region

机译：农业集约化对水生生物多样性的两方面影响：来自沿海地区池塘和自然湿地的手足类生物多样性

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Increasing agricultural land use and intensification have given rise to the loss and eutrophication of coastal wetlands worldwide. In Mediterranean coastal regions, irrigated agriculture, in turn, has prompted the proliferation of farm ponds which might compensate for wetland loss and degradation if their management regimen results are compatible with biodiversity conservation. Here, we studied regional (gamma-), local (alpha-) and interlocal (beta-) diversities of chironomids in coastal wetlands and irrigation ponds from a Mediterranean region, to determine the contribution of each habitat type to regional diversity, and to disentangle which environmental factors, anthropogenic or natural, contributed most to explain diversity patterns. Regional diversity was slightly, but still significantly, higher in natural wetlands than in farm ponds, which can be attributed to the significantly higher beta-diversity in natural wetlands, since, despite the much larger surface area of wetlands, both habitat types did not differ in local diversity (alpha-diversity). In both habitats, however, the contribution of beta-diversity to regional diversity was higher compared to that of alpha-diversity, and the component 'spatial species turnover' exceeded that of the component 'nestedness' of beta-diversity. This, together with an outstanding assemblage complementarity (approx. 50%) between habitat types, emphasizes the vital contribution of farm ponds, together with natural wetlands, to regional diversity. Despite the higher salinity and eutrophication of natural wetlands that tended to reduce diversity in chironomid assemblages, their more heterogeneous shore line likely compensated somewhat for such negative effects. Unlike wetlands, the homogeneous and unvegetated shore of farm ponds, in conjunction with their intensive management, probably induced adverse effects on local and interlocal diversity. Specific recommendations are given in this regards to mitigate impacts and improve the value of both habitats for biodiversity conservation. (C) 2015 Elsevier Ltd. All rights reserved.
机译：农业土地使用的增加和集约化导致了全世界沿海湿地的丧失和富营养化。在地中海沿岸地区，灌溉农业反过来促进了池塘的扩散，如果其管理方案结果与生物多样性保护相吻合，这可能可以弥补湿地的丧失和退化。在这里，我们研究了地中海沿岸湿地和灌溉池塘中的手足类动物的区域（γ-），局部（α-）和区域间（β-）多样性，以确定每种生境类型对区域多样性的贡献并消除纠缠人为或自然的环境因素对解释多样性模式的贡献最大。与湿地相比，自然湿地的区域多样性略高，但仍然显着高于农场池塘，这可以归因于自然湿地的β多样性明显更高，因为尽管湿地的表面积更大，但两种生境类型没有差异在当地的多样性（阿尔法多样性）中。然而，在两个生境中，β-多样性对区域多样性的贡献均高于α-多样性，并且“空间物种周转”成分超过了β-多样性的“嵌套”成分。这与栖息地类型之间出色的组合互补性（约50％）一起，凸显了农场池塘以及自然湿地对区域多样性的重要贡献。尽管天然湿地的盐度和富营养化程度较高，往往会减少手足类种群的多样性，但它们的异质岸线可能在某种程度上弥补了这种负面影响。与湿地不同，农场池塘的均质，无植被的海岸，以及对其进行的集约化管理，可能对当地和地区间的多样性产生不利影响。在这方面提出了具体建议，以减轻影响并提高两个生境对生物多样性保护的价值。 （C）2015 Elsevier Ltd.保留所有权利。

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