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首页> 外文期刊>Estuarine Coastal and Shelf Science >Patterns of association between canopy-morphology and understorey assemblages across temperate Australia
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Patterns of association between canopy-morphology and understorey assemblages across temperate Australia

机译：温带澳大利亚冠层形态与下层组合之间的关联模式

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摘要

Patterns of association between canopy and understorey vegetation have been described over 1000s of km according to the presence and absence of algal canopies and the different types of canopies. However, the degree to which morphological variation of the canopy is correlated with patterns in the understorey algal assemblage is unknown. We tested the hypothesis that variation in the morphology of Ecklonia radiata, growing in monospecific canopies, is associated with variation in the structure of understorey assemblages at regional scales across temperate Australia. We found that the morphology of kelp did correlate with the structure of understorey assemblages, over broad spatial scales, particularly that of surface area/volume ratio and measures of stipe width. These canopy-understorey associations revealed two 'types' of kelp forest; one characteristic of Western and South Australia and the other of Eastern Australia. We suggest that future research on causal relationships between morphology and understorey assemblages of algae consider the potential importance that morphology may have on mechanisms such as light penetration and physical abrasion by fronds. Whilst correlations between the understorey and morphology do not demonstrate causality, the realisation that these associations occur over broad spatial scales and that southern and eastern Australia differ in their 'type' of kelp forest, at the very least, contributes to a more broadly based understanding of a major ecological pattern across the world's most extensive west-east coastline.
机译：根据藻类冠层的存在与否以及不同类型的冠层，已经描述了冠层与下层植被之间的关联模式超过1000千米。然而，冠层的形态变化与底层藻类组合中的图案相关的程度尚不清楚。我们测试了以下假设：在澳大利亚温带地区，在单特异性冠层中生长的Ecklonia radiata形态的变化与下层组合结构的变化有关。我们发现，海带的形态确实与下层组合的结构相关，在较大的空间尺度上，尤其是表面积/体积比和柄宽的度量。这些冠层与下层的联系揭示了两种“类型”的海带森林。西澳大利亚州和南澳大利亚州的一个特征，东澳大利亚州的另一个特征。我们建议，有关藻类形态与底层结构之间因果关系的未来研究应考虑形态学可能对诸如光穿透和叶状体物理磨损等机制具有潜在的重要性。虽然下层和形态之间的相关性没有显示因果关系，但认识到这些联系发生在广泛的空间尺度上，并且澳大利亚南部和东部的海带森林“类型”不同，至少有助于更广泛的了解。遍及世界上最广阔的东西沿海的主要生态格局。

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