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首页> 外文期刊>Polar biology >The subtidal macrobenthic assemblages of Bahia San Sebastian (Tierra del Fuego, Argentina)
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The subtidal macrobenthic assemblages of Bahia San Sebastian (Tierra del Fuego, Argentina)

机译：Bahia San Sebastian（阿根廷火地岛）的潮下大型底栖动物组合

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摘要

Bahia San Sebastian (BSS), a shallow and protected environment on the eastern coast of Tierra del Fuego (Argentina), is a prime habitat for several species of nearctic migratory birds that visit the area during summer to feed in its huge intertidal mudflats. The area has also great economic value due to the extraction and transport of hydrocarbons. Twenty-three dredge stations were analysed and presence/ absence data were used to classify stations and species by cluster analysis. Two algae and 113 taxa of macrobenthic invertebrates from 12 animal phyla were identified. Species richness was one order of magnitude higher (mean 29.0 sp st~(-1)) in stations located outside or in the southern unprotected section of BSS than in most muddy or sandy stations within the bay (mean 3.7 sp st~(-1)). Hard bottom stations outside BSS were dominated by a rich assemblage of sessile filter-feeders, mainly bryozoans, hydrozoans, ascidians, sponges, and the bivalve Aulacomya atra. Soft bottom areas inside BSS were mainly populated by relatively few species of deposit-feeders, such as the orbiniid polychaete Phylo felix, which was particularly frequent and widespread. Shells of the clam Mulinia edulis are very common, representing one of the few hard substrata available for sessile species on soft bottoms. Epibenthic assemblages within BSS were dominated by the detritivorous isopod Serolis paradoxa and the crab Eurypodlus latrelllel. The macrobenthic fauna of BSS can be regarded as typical of the Magellan region, showing affinities with those of other localities around Tierra del Fuego, the Straits of Magellan and the southern Chilean fjords.
机译：巴伊亚圣塞瓦斯蒂安（BSS）是位于火地岛（阿根廷）东海岸的一个浅浅且受保护的环境，是数种近迁性候鸟的主要栖息地，它们在夏季到该地区觅食，以觅食其巨大的潮间带滩涂。由于碳氢化合物的提取和运输，该地区也具有巨大的经济价值。分析了23个疏edge站，并通过聚类分析将存在/不存在的数据用于对站和物种进行分类。从12种动物门中鉴定出2种藻类和113种大型底栖无脊椎动物。 BSS无保护区南部或南部的站点的物种丰富度比海湾内大多数泥泞或沙质站点高（平均3.7 spst〜（-1），高2个数量级（-1）。 ））。 BSS外部的坚硬底部站主要由无柄滤食器组成，主要是苔藓虫，水生动物，海鞘，海绵和双壳类Aulacomya口。 BSS内部的软底部区域主要由相对较少种类的沉积物喂食器组成，例如，鸟巢类多毛or Phylo felix尤其常见且分布广泛。蛤类Mulinia edulis的壳很常见，代表了可用于软底无土物种的少数硬质基质之一。 BSS内的上栖动物组合主要由有害的等足类Seolis paradoxa和蟹Eurypodlus latrelllel主导。 BSS的大型底栖动物群可被视为麦哲伦地区的典型动物，与火地岛（Tierra del Fuego），麦哲伦海峡和智利南部峡湾附近的其他地区的亲缘关系十分密切。

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