Spatial clustering of habitat structure effects patterns of community composition and diversity
Spatial clustering of habitat structure effects patterns of community composition and diversity
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DOI：
10.1890/11-1190.1
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发表时间：
2012-05-01
期刊：
影响因子：
4.8
通讯作者：
Holyoak, Marcel
中科院分区：
文献类型：
--
作者：
Altermatt, Florian;Holyoak, Marcel
自然生态系统往往显示出在空间聚集的高生产力的栖息地。环境干扰也往往是非随机分布在空间和内在联系的栖息地质量或独立的发生。理论研究预测，配置和聚集的栖息地斑块质量和干扰可以影响metacrification组成和多样性，但实验证据在很大程度上是缺乏的。在metachtability实验中，我们测试了空间自相关干扰和空间聚集的斑块质量对区域和局部丰富度，群落差异，和社区组成的影响。我们发现，空间聚集的补丁质量普遍增加的原生动物和轮虫在微观世界中的社区的原生动物和轮虫的社区相异性（基于两个措施的β多样性）。景观结构和干扰的位置对B多样性有显着的相互作用的影响，这部分取决于特定的β多样性措施。干扰对聚集景观组成和丰富度的影响一般取决于不同类型生境斑块之间的距离和连通性。我们的研究结果还表明，在单个补丁的干扰的影响不能直接外推到景观尺度：预测可能是正确的，当只考虑物种丰富度，但β多样性的重要变化可能会被忽视。生物多样性和保护研究需要考虑生境质量和干扰的空间聚集以及空间聚集之间的连通性。
Natural ecosystems often show highly productive habitats that are clustered in space. Environmental disturbances are also often nonrandomly distributed in space and are either intrinsically linked to habitat quality or independent in occurrence. Theoretical studies predict that configuration and aggregation of habitat patch quality and disturbances can affect metacommunity composition and diversity, but experimental evidence is largely lacking. In a metacommunity experiment, we tested the effects of spatially autocorrelated disturbance and spatial aggregation of patch quality on regional and local richness, among-community dissimilarity, and community composition. We found that spatial aggregation of patch quality generally increased among-community dissimilarity (based on two measures of beta diversity) of communities containing protozoa and rotifers in microcosms. There were significant interacting effects of landscape structure and location of disturbances on b diversity, which depended in part on the specific beta diversity measures used. Effects of disturbance on composition and richness in aggregated landscapes were generally dependent on distance and connectivity among habitat patches of different types. Our results also show that effects of disturbances in single patches cannot directly be extrapolated to the landscape scale: the predictions may be correct when only species richness is considered, but important changes in beta diversity may be overlooked. There is a need for biodiversity and conservation studies to consider the spatial aggregation of habitat quality and disturbance, as well as connectivity among spatial aggregations.