Ice disturbance intensity structures benthic communities in nearshore Antarctic waters
Ice disturbance intensity structures benthic communities in nearshore Antarctic waters
复制标题
冰扰强度结构南极近岸水域的底栖群落
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Smale
中科院分区：
文献类型：
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作者：
D. Smale
冰冲刷是影响生态系统的5种最重要的自然力之一，但很少有数据将冰扰动强度与底栖生物群落结构参数联系起来。在南极洲阿德莱德岛的2个近岸站点，在3个分辨率的底栖生物采样，使生物数据和文献中的经验干扰数据之间的新的联系。共记录到125个分类群和> 70000个个体。共测定了8个群落结构参数，在一个地点，它们都与干扰强度呈负相关，而在另一个地点，发现6个显着的关系。在2的3个采样分辨率，干扰，而不是深度或覆盖率的主要基层类型，是最相关的环境变量的格局在社区结构。此外，生物样品分为3类的基础上的干扰数据（低，中，高）。各组在统计上是不同的，固着动物的相对丰度随着干扰强度的增加而减少。干扰的强度与深度广泛相关，但小规模的地形和底层类型的差异创建小规模的避难所，支持更丰富的组合。总的来说，这两个研究地点经常受到干扰，没有证据表明在中度干扰的位置丰富的峰值记录。
Ice scouring is one of the 5 most significant natural forces acting on ecosystems, yet very few data exist linking the intensity of ice disturbance with parameters of benthic community structure. The benthos at 2 nearshore sites on Adelaide Island, Antarctica, was sampled at 3 resolutions to make novel links between biological data and empirical disturbance data from the literature. A total of 125 taxa and >70 000 individuals were recorded. A total of 8 parameters of community structure were measured; all of them were negatively correlated to disturbance intensity at one site, whilst 6 significant relationships were found at the other site. At 2 of the 3 sampling resolutions, disturbance, rather than depth or the percentage cover of major substratum types, was the environmental variable most correlated with the patterns in community structure. Furthermore, biological samples were divided into 3 categories based on the disturbance data (low, moderate and high). Each group was statistically dissimilar and the relative abundance of sessile fauna decreased as disturbance intensity increased. The intensity of disturbance was broadly correlated with depth, but small scale differences in topography and substratum type created small-scale refugia, which supported richer assemblages. Overall, both study sites were disturbed frequently and no evidence of a peak in richness at the moderately disturbed locations was recorded.