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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Contrasting spatial heterogeneity of sessile organisms within mussel (Perna perna L.) beds in relation to topographic variability
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Contrasting spatial heterogeneity of sessile organisms within mussel (Perna perna L.) beds in relation to topographic variability

机译：贻贝（Perna perna L.）床中固着生物的空间异质性与地形变异性的关系

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摘要

We examined the spatial heterogeneity in three sessile rocky shore organisms, the mussel Perna perna, the barnacle Octomeris angulosa (Sowerby) and the red alga Gelidium pristoides (Turn.) at a range of continuous local scales along horizontal transects within mid- and upper mussel beds of South African shores. We also examined the relationships between variability of organisms and topographic features (rock depressions, slope, aspect), and between mussel, barnacle and algal variability over the same scales. To estimate spatial heterogeneity, we analyzed scaling properties of semivariograms using a fractal approach. Relationships between different variables at the different scales were examined by cross-semivariograms. Spatial dependence of P. perna variability increased with spatial dependence of topographic variability, so that scaling regions of mussel and topographic distributions corresponded well. This relationship often improved with larger local scales (mussel cover increased with depressions, steeper slope and aspect towards waves), while at smaller spatial scales, variability in mussel cover was less well explained by variability in topography. The variability of the barnacle O. angulosa exhibited spatial dependence, even on topographically unstructured shores. In contrast, the distribution of the alga G. pristoides revealed high fractal dimensions, showing spatial independence on topographically unstructured shores. Algae also showed a very strong negative relationship with mussels at most local scales, and a negative relationship with barnacles in upper zones, especially at larger local scales. Barnacles may show clear spatial dependence because of hydrodynamics (at larger local scales) and the need to find a future mate in close proximity (at smaller local scales), while algae may show a strong negative relationship with mussels because of competition for space.
机译：我们研究了三种无柄多岩石的海岸生物，贻贝Perna perna，藤壶Octomeris angulosa（Sowerby）和红藻Gelidium pristoides（Turn。）的空间异质性。南非海岸的床。我们还研究了在相同规模上生物体变异与地形特征（岩石凹陷，坡度，坡向）之间以及贻贝，藤壶和藻类变异之间的关系。为了估计空间异质性，我们使用分形方法分析了半变异函数的缩放特性。通过交叉半变异函数图检查了不同尺度下不同变量之间的关系。多年生疟原虫变异性的空间依赖性随着地形变异性的空间依赖性而增加，因此贻贝的缩放区域和地形分布很好地对应。这种关系通常随着较大的局部尺度而改善（贻贝覆盖率随凹陷，陡峭的坡度和朝向波浪的方向而增加），而在较小的空间尺度上，贻贝覆盖率的变异性不能用地形变异性很好地解释。藤壶O. angulosa的变异性表现出空间依赖性，即使在地形不规则的海岸上也是如此。相反，藻类G. pristoides的分布显示出高的分形维数，显示了在地形非结构化海岸上的空间独立性。在大多数地方尺度上，藻类与贻贝也显示出非常强的负相关关系，而在上部地区，尤其是在更大的地方尺度上，与藤壶也具有负相关关系。由于流体动力学（在较大的局部尺度上）和需要在近距离内寻找未来的伴侣（在较小的局部尺度上），藤壶可能表现出明显的空间依赖性，而藻类可能由于争夺空间而与贻贝显示出强烈的负相关关系。

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