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Algal canopy as a proxy for the disturbance history of understorey communities in East Antarctica

机译：藻类冠层替代南极东部底层社区的扰动历史

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摘要

Much of the macroalgal zonation on Antarctic coasts is thought to be maintained by ice scour. The frequency and severity of ice scour typically decrease with depth, which is hypothesized to drive the zonation of two canopy-forming macroalgae, Desmarestia menziesii and Himantothallus grandifolius. If true, understorey communities should share the same history of ice scour as their respective canopies, and their composition should vary accordingly. To evaluate this prediction we collected boulders from under each canopy species at two depths, 6 and 12 m, at two sites on the coast of East Antarctica. We examined the hard-substrate communities growing on boulders and tested for differences in community composition with respect to canopy species, surface orientation, and depth. Communities under the different canopies snowed some variation consistent witn me hypothesized difference in disturbance history. Those under H. grandifolius accommodated a greater abundance and diversity of sponges, which is usually characteristic of older, later successional communities. Differences were subtle, however, suggesting that canopies might be maintained by ice disturbance over large temporal scale relative to those at which understorey communities develop, and/or that canopies themselves influence understorey composition. This study describes patterns associated with one of the most prominent examples of bathymetric zonation in shallow Antarctic benthos, and experimental work is now needed to partition the processes at work.
机译：据认为，南极沿海地区的许多大型藻类带是通过冰冲作用维持的。冰冲的频率和严重性通常随深度而降低，据推测这会驱动形成两个冠层的大型藻类Desmarestia menziesii和Himantothallus grandifolius的分区。如果属实，下层社区应与各自的顶篷共享相同的冰激凌历史，其组成也应相应变化。为了评估这一预测，我们在南极东部沿海两个地点的两个冠层物种（分别为6和12 m）处收集了巨石。我们检查了在巨石上生长的硬质基质群落，并测试了群落组成在冠层物种，表面取向和深度方面的差异。在不同的树冠下的社区下雪了一些变化，与假设的干扰历史差异一致。那些在H. grandifolius下生活的海绵拥有更多的丰富性和多样性，这通常是较老的，后来的演替社区的特征。然而，差异是微妙的，这表明，相对于下层群落发展和/或下层冠层本身影响下层组成，冠层冠层可能在较大的时间尺度上受到冰扰动的影响。这项研究描述了与南极浅层底栖动物的等深线分区最突出的例子之一相关的模式，现在需要实验工作来划分工作过程。

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  • 来源
    《Polar biology》 |2011年第6期|p.781-790|共10页
  • 作者

    Graeme F. Clark; Jonathan S. Stark; Lisa A. Perrett; Nicole A. Hill; Emma L. Johnston;

  • 作者单位

    Evolution and Ecology Research Centre,University of New South Wales, Sydney, NSW 2052, Australia;

    Environmental Protection and Change Program, Australian Antarctic Division, Kingston, TAS 7050, Australia;

    The Great Barrier Reef Marine Park Authority,PO Box 1379, Townsville, QLD 4810, Australia;

    Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia;

    Evolution and Ecology Research Centre,University of New South Wales, Sydney, NSW 2052, Australia;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    boulder; hard-substrate; invertebrates; desmarestia menziesii; himantothallus grandifolius;

    机译：巨石硬质基材无脊椎动物desmarestia menziesii;大花海葵;

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