Premium
Contrasting effects of natural and anthropogenic stressors on beta diversity in river organisms
Author(s) -
GutiérrezCánovas Cayetano,
Millán Andrés,
Velasco Josefa,
Vaughan Ian P.,
Ormerod Steve J.
Publication year - 2013
Publication title -
global ecology and biogeography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.164
H-Index - 152
eISSN - 1466-8238
pISSN - 1466-822X
DOI - 10.1111/geb.12060
Subject(s) - nestedness , beta diversity , species richness , ecology , biodiversity , invertebrate , stressor , benthic zone , alpha diversity , habitat , natural (archaeology) , species diversity , environmental science , biology , geography , neuroscience , paleontology
Aim We hypothesized that mechanisms underlying beta diversity in rivers would differ between gradients where (1) natural stressors result in progressive species turnover with high specificity and (2) anthropogenic stressors result in the loss of specialist taxa thus giving rise to nestedness. Location G reat B ritain, the I berian P eninsula and the H imalayan M ountains. Methods We analysed five datasets describing benthic macroinvertebrates sampled along natural (elevation, salinity) and anthropogenic (acidity, metals, land use) stress gradients. Predictions were tested by fitting models relating species richness and beta‐diversity components (total, turnover and nestedness dissimilarities) to putative stress intensity (i.e. the degree to which a particular environmental constraint filters species occurrence). Results Stress intensity accounted for most of the variability in species richness ( r 2 = 0.64–0.93), which declined with increasing stress. Dissimilarity in community composition between locations increased with the difference in stress intensity for all datasets. For natural stressors, beta‐diversity patterns mainly reflected species turnover, whilst for anthropogenic stressors beta diversity mainly reflected nesting of subsets of species as stress intensity increased. Main conclusions Our results support the hypothesis that natural and anthropogenic stressors generate contrasting patterns in beta diversity that arise through different mechanisms.