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首页> 外文期刊>Marine ecology progress series >Effects of freshwater input on shallow-water infaunal communities in Doubtful Sound, New Zealand
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Effects of freshwater input on shallow-water infaunal communities in Doubtful Sound, New Zealand

机译：淡水输入对新西兰神奇峡湾浅水臭名昭著的群落的影响

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Infaunal community structure is sensitive to both the range of salinity values and timing of exposure wrought by the time course and magnitude of freshwater input to estuaries. We sampled macro-infauna ( > 1 mm) from soft sediment habitat at 8 shallow sites (2 m below MHW; mean high water) within 4 regions in the Doubtful-Thompson Sound complex, a fjord in southwestern New Zealand. This fjord receives a large influx of freshwater from natural and anthropogenic sources that form a distinct low salinity surface layer and drive mean estuarine circulation. Shallow water soft sediment habitat in the fjord is highly fragmented and subject to strong environmental gradients shaped by freshwater input patterns. Infaunal community structure in the inner region of Doubtful Sound was consistently different from other regions of the fjord. This was evidenced by a low abundance of bivalves, decapods, and polychaetes in the family Orbiniidae, and elevated abundance of amphipods and polychaetes in the family Neredidae. An analysis of taxonomic richness among regions revealed that the inner regions of Doubtful Sound are also the least rich in the complex. Both taxonomic richness and patterns in abundance of the major taxa covary with physical information on the return times for low salinity events, thickness, and patterns in mixing in the freshwater layer. These results are consistent with a large impact of the persistent discharge of freshwater from the Manapouri power station on shallow water infaunal communities in the fjord. The loss of bivalves in particular has large implications for patterns in food-web structure and function in this system.
机译：臭名昭著的群落结构对盐度值的范围和暴露于河口的淡水的时程和量所造成的暴露时间都很敏感。我们从位于新西兰西南部峡湾的Doubtful-Thompson Sound情结的4个区域中的8个浅层站点（距MHW以下2 m；平均水位高）的软沉积物栖息地中取样了大型动物（> 1 mm）。峡湾从自然和人为来源接收大量淡水，形成明显的低盐度表层并驱动河口平均循环。峡湾的浅水软沉积物栖息地高度零散，并受淡水输入模式影响而形成强烈的环境梯度。令人怀疑的声音内部区域的臭名昭著的社区结构与峡湾的其他区域始终不同。这由Orbiniidae家族中的双壳类，十足纲和多足纲的丰富度低以及Neredidae家族中的两栖纲和多足纲的丰富度得到了证明。对区域之间的分类学丰富度进行分析后发现，“可疑声音”的内部区域也最复杂。分类学丰富度和主要分类单元丰富的模式，以及有关淡水层低盐度事件，厚度和混合模式返回时间的物理信息。这些结果与从Manapouri电站持续排放淡水对峡湾浅水臭名昭著的社区的巨大影响是一致的。特别是双壳类动物的丧失对于该系统中食物网结构和功能的模式具有重大影响。

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