The area-independent effects of habitat complexity on biodiversity vary between regions
The area-independent effects of habitat complexity on biodiversity vary between regions
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DOI：
10.1046/j.1461-0248.2003.00404.x
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发表时间：
2003-02-01
期刊：
影响因子：
8.8
通讯作者：
Hawkins, SJ
中科院分区：
文献类型：
--
作者：
Johnson, MP;Frost, NJ;Hawkins, SJ
在物种丰富度的研究中，潜在的解释变量往往是共同变化的。如果在一次调查中地形各不相同，就很难将地区和生境多样性的影响分开。地形复杂的表面可能包含更多的物种，这是由于生境多样性的增加或由于面积本身的增加。分形几何可用于调整物种丰富度估计，以控制复杂表面上面积的增加。分形技术的应用调查的岩石海岸表现出明确的区域独立的地形对物种丰富度的影响在马恩岛。相比之下，在英格兰西南部的物种丰富度的变化反映了表面的可用性。多变量测试和帽贝丰度的变化也表明了地形的区域独立影响的区域变化。社区组成没有变化，在英格兰西南部的表面复杂性增加。这些结果表明，大规模梯度的异质性对社会进程或人口的影响。
Potential explanatory variables often co-vary in studies of species richness. Where topography varies within a survey it is difficult to separate area and habitat-diversity effects. Topographically complex surfaces may contain more species due to increased habitat diversity or as a result of increased area per se . Fractal geometry can be used to adjust species richness estimates to control for increases in area on complex surfaces. Application of fractal techniques to a survey of rocky shores demonstrated an unambiguous area-independent effect of topography on species richness in the Isle of Man. In contrast, variation in species richness in south-west England reflected surface availability alone. Multivariate tests and variation in limpet abundances also demonstrated regional variation in the area-independent effects of topography. Community composition did not vary with increasing surface complexity in south-west England. These results suggest large-scale gradients in the effects of heterogeneity on community processes or demography.