The area-independent effects of habitat complexity on biodiversity vary between regions
Johnson, Mark P., Frost, Natalie J., Mosley, Matthew W.J., Roberts, Malcolm.F. and Hawkins, Stephen J. (2003) The area-independent effects of habitat complexity on biodiversity vary between regions. Ecology Letters, 6, (2), 126-132. (doi:10.1046/j.1461-0248.2003.00404.x).
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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.
|Keywords:||fractal, heterogeneity, lottery, spacing, topography|
|Subjects:||Q Science > QH Natural history > QH301 Biology|
|Divisions:||University Structure - Pre August 2011 > School of Biological Sciences
University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
|Date Deposited:||08 Aug 2008|
|Last Modified:||25 Apr 2013 17:35|
|Contact Email Address:||email@example.com|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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