Goodsell P J, Underwood A J
Centre for Research on Ecological Impacts of Coastal Cities, Marine Ecology Labs A11, University of Sydney, Sydney 2006, Australia.
Oecologia. 2008 Sep;157(3):509-19. doi: 10.1007/s00442-008-1087-x. Epub 2008 Jun 24.
There is considerable debate about whether stability (e.g. inertia) of an assemblage, or of individuals in an assemblage, is positively associated with the number of species or whether there are idiosyncratic effects of particular species. We assessed the general model that the loss of an individual alga, caused by trampling, is greater in monospecific than in multi-species stands but that the responses of algae are idiosyncratic, depending on the morphology of the species. The experiment was done on conspicuous and dominant algae with different morphology on temperate Australian rocky shores: the fucalean algae Hormosira banksii and Sargassum sp. and the coralline alga Corallina officinalis. We assessed the relative and interactive effects of the extent of trampling (number of paths) and the localised intensity of trampling (number of travels per path) on the three algae. The number of paths trampled (the extent of disturbance) had more impact on each alga than the number of times paths were travelled (the intensity of disturbance). As predicted, H. banksii was most susceptible to trampling at each level than were the coarser algae Sargassum sp. and C. officinalis. There was a consistent trend for each alga to be more inert to trampling when in the presence of the other two species than when in monospecific stands, but this was only statistically significant (P < 0.05) for the softer alga H. banksii. The responses of H. banksii and Sargassum sp. to disturbance seemed, in many cases, to be due to the presence of C. officinalis rather than to "diversity" per se. The relationship between the number of species and stability is complex in intertidal habitats, depending on the species and the combinations of species with which it grows.
关于群落的稳定性（如惯性）或群落中个体的稳定性是否与物种数量呈正相关，或者是否存在特定物种的特殊影响，存在着相当大的争论。我们评估了一个通用模型，即由践踏导致的单个藻类损失，在单物种群落中比在多物种群落中更大，但藻类的反应是特异的，取决于物种的形态。该实验是在澳大利亚温带岩石海岸上对具有不同形态的显眼且占优势的藻类进行的：墨角藻科藻类Hormosira banksii和马尾藻属以及珊瑚藻Corallina officinalis。我们评估了践踏程度（路径数量）和局部践踏强度（每条路径的行走次数）对这三种藻类的相对和交互影响。被践踏的路径数量（干扰程度）对每种藻类的影响比路径行走次数（干扰强度）更大。正如预测的那样，在每个水平上，H. banksii比更粗壮的藻类马尾藻属和C. officinalis更容易受到践踏。当与其他两个物种共存时，每种藻类对践踏的惰性都比在单物种群落中更大，这是一个一致的趋势，但只有较软的藻类H. banksii在统计学上具有显著差异（P < 0.05）。在许多情况下，H. banksii和马尾藻属对干扰的反应似乎是由于C. officinalis的存在，而不是由于“多样性”本身。潮间带生境中物种数量与稳定性之间的关系很复杂，这取决于物种以及与其共生的物种组合。
