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首页> 外文期刊>Estuarine Coastal and Shelf Science >Abrupt transitions between macrobenthic faunal assemblages across seagrass bed margins
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Abrupt transitions between macrobenthic faunal assemblages across seagrass bed margins

机译：海草床边缘的大型底栖动物群落之间的突然过渡

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摘要

The nature of the transition from one contrasting macrobenthic assemblage to another across interfaces between intertidal seagrass and unvegetated sand was investigated in the subtropical Moreton Bay Marine Park, eastern Australia, via six two-dimensional core lattices. The same pattern of transition was manifested in each lattice. Macrofaunal abundance, species density (both observed and estimated total) and assemblage composition did not vary with distance away from the interface within the 0.75 m wide marginal bands of each habitat type. Neither were there significant differences in assemblage metrics or composition between the marginal and non-edge regions of either habitat. There were, however, very marked differences in assemblage composition, abundance and species density across the 25 cm wide strip on either side of the actual interface, the interacting assemblages reacting symmetrically. All these differences therefore took place over an ecotone distance of only 0.5 m at most. Spatial trends in assemblage metrics across the boundary zone were captured accurately by second and third order polynomial regression models. It also appeared that edge effects on individual species within the seagrass were a variable local response not a consistent effect of closeness to the bare sand.
机译：在澳大利亚东部的亚热带莫顿湾海洋公园中，通过六个二维核心网格，研究了潮间带海草和无植被沙之间从一种大型底栖动物组合过渡到另一种的过渡性质。在每个晶格中都表现出相同的过渡模式。在每种生境类型的0.75 m宽边带内，大型动物的丰度，物种密度（观察到的和估计的总数）和组合物的组成都不会随着距界面的距离而变化。在任一生境的边缘和非边缘区域之间的组合度量或组成方面都没有显着差异。但是，在实际界面两侧的25厘米宽的条带上，组合物的组成，丰度和物种密度存在明显差异，相互作用的组合物对称地反应。因此，所有这些差异都发生在最多仅0.5 m的过渡带距离上。通过二阶和三阶多项式回归模型可以准确地捕获跨边界区域的组合度量的空间趋势。还显示出，对海草内单个物种的边缘效应是变化的局部响应，而不是对裸露沙地的持续影响。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第10期|213-223|共11页
  • 作者

    R.S.K. Barnes; S. Hamylton;

  • 作者单位

    School of Biological Sciences, University of Queensland, Brisbane, Queensland 4072, Australia,Biodiversity Program, Queensland Museum (South Bank), Brisbane, Queensland 4101, Australia;

    School of Earth & Environmental Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    benthos; biodiversity; ecotone; edge effects; sandflat; seagrass;

    机译：便当生物多样性;过渡带边缘效应沙滩海草;

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