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Complexity in the relationship between matrix composition and inter-patch distance in fragmented habitats

机译：零散生境中基质组成与斑块间距离之间关系的复杂性

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摘要

The connectivity of fragmented landscapes is a function of the physical distance between suitable habitats and the characteristics of the habitat through which the animal is moving, i.e. the matrix. Experimental manipulations done to explain how spatial arrangement and composition of habitats affects biota remain scarce, particularly in marine systems. Holdfasts of the common kelp, Ecklonia radiata, are discrete units of habitat for small invertebrates (e.g. amphipods, isopods, molluscs, annelids) that can be isolated from other holdfasts by habitat, which may be less suitable (e.g. other species of algae or relatively bare space). We compared assemblages, which colonised defau-nated holdfasts in experimentally created small-scale landscapes where patches of habitat (holdfasts) were distant versus close together and which had Sargassum spp. versus relatively bare space in the matrix. We also compared colonisation across matrices of crushed fucoid algae to assess whether the structural or chemical nature of algae in the matrix had the most influence on the colonisation. Assemblages in defaunted holdfasts differed between those that were close to and those that were distant from undisturbed holdfasts, where the matrix was devoid of vegetation. Where Sargassum spp. was present in the matrix, however, this difference disappeared and was possibly due to the chemical, rather than structural, characteristics of the fucoid matrix. The extent to which matrix habitat is a barrier to movement of invertebrates among holdfasts thus depends on not only how extensive it is but what type of habitat it contains. As within terrestrial systems, the nature of the matrix is also likely to be a fundamental component of the connectivity within marine systems.
机译：零散的景观的连通性是合适的栖息地之间的物理距离和动物活动所经过的栖息地（即矩阵）特征的函数。进行实验操作以解释栖息地的空间布置和组成如何影响生物群的情况仍然很少，特别是在海洋系统中。常见海带Ecklonia radiata的固定带是小无脊椎动物（例如，两栖类，等脚类，软体动物，无节肢动物）的栖息地的离散单位，可以通过栖息地与其他固定带分离，这可能不太适合（例如其他藻类或相对藻类）裸露的空间）。我们比较了一些组合，这些组合在实验创建的小规模景观中定居下来的固定的禁食区，栖息地的各个部分（固定区）相距较远，且彼此靠近，并且具有Sargassum spp。相对于矩阵中相对裸露的空间。我们还比较了粉碎的岩藻糖藻类基质之间的定殖，以评估基质中藻类的结构或化学性质对定殖的影响最大。受到拥护的fastfast的组合在接近和远离未受干扰的fastfast的组合之间有所不同，在这种情况下，矩阵没有植被。那里Sargassum spp。存在于基质中，但是这种差异消失了，可能是由于岩藻糖基质的化学特征而非结构特征所致。因此，基质栖息地阻碍无脊椎动物在禁食之间运动的程度不仅取决于其栖息地的广泛性，还取决于其所包含的栖息地的类型。与地面系统一样，矩阵的性质也可能是海洋系统内连接性的基本组成部分。

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  • 来源
    《Marine biology》 |2008年第1期|p.117-125|共9页
  • 作者

    P. J. Goodsell; S. D. Connell;

  • 作者单位

    Southern Seas Ecology Laboratories, School of Earth and Environmental Sciences DP 418, University of Adelaide, Adelaide, South Australia 5005, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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