Ecological contrasts across an Antarctic land–sea interface
Ecological contrasts across an Antarctic land–sea interface
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南极陆海界面的生态对比
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Convey
中科院分区：
文献类型：
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作者：
C. Waller;D. Barnes;P. Convey
我们报道了南极半岛阿德莱德岛Rothera研究站周围陆生、潮间带和浅海下动物群落的组成。我们检验了主要的假设，即海洋环境的物种丰富度、生物量和丰度将比陆地环境高得多，而且两者都将大于潮间带的物种丰富度、生物量和丰度。我们还比较了潮间带和潮下带之间选定海洋类群的年龄和大小，以检验这样的假设，即在更紧张的环境(潮间带)中的动物会更小、寿命更短。潮间带和潮下带群落的物种丰富度相似，在组成上有相当大的重叠。然而，与以前的报告不同的是，陆地群落与潮间带没有重叠，特别是在南极半岛和Scotia Arc更靠北的地方。底栖动物生物量变化较大，但在亚潮间带最高。虽然陆地群落退化，生物量低，但它们的总体丰度最高，平均每平方米超过3×105只。同一物种潮间带和潮下带个体的年龄没有显著差异，潮间带存在最大4岁的苔藓虫群体。与预期和有限的现有文献相比，我们得出结论，虽然南极潮间带显然是一个次优和高度紧张的栖息地，但其动物群落可以很好地建立和相对多样化，并不局限于短期机会主义者或流浪者和流浪者。
We report the composition of terrestrial, intertidal and shallow sublittoral faunal communities at sites around Rothera Research Station, Adelaide Island, Antarctic Peninsula. We examined primary hypotheses that the marine environment will have considerably higher species richness, biomass and abundance than the terrestrial, and that both will be greater than that found in the intertidal. We also compared ages and sizes of individuals of selected marine taxa between intertidal and subtidal zones to test the hypothesis that animals in a more stressed environment (intertidal) would be smaller and shorter lived. Species richness of intertidal and subtidal communities was found to be similar, with considerable overlap in composition. However, terrestrial communities showed no overlap with the intertidal, differing from previous reports, particularly from further north on the Antarctic Peninsula and Scotia Arc. Faunal biomass was variable but highest in the sublittoral. While terrestrial communities were depauperate with low biomass they displayed the highest overall abundance, with a mean of over 3 × 105 individuals per square metre. No significant differences in ages of intertidal and subtidal individuals of the same species were found, with bryozoan colonies of up to 4 years of age being present in the intertidal. In contrast with expectation and the limited existing literature we conclude that, while the Antarctic intertidal zone is clearly a suboptimal and highly stressful habitat, its faunal community can be well established and relatively diverse, and is not limited to short-term opportunists or waifs and strays.