title: Contaminants reduce the richness and evenness of marine communities: a review and meta-analysis.
abstract: Biodiversity of marine ecosystems is integral to their stability and function and is threatened by anthropogenic processes. We conducted a literature review and meta-analysis of 216 studies to understand the effects of common contaminants upon diversity in various marine communities. The most common diversity measures were species richness, the Shannon-Wiener index (H') and Pielou evenness (J). Largest effect sizes were observed for species richness, which tended to be the most sensitive index. Pollution was associated with marine communities containing fewer species or taxa than their pristine counterparts. Marine habitats did not vary in their susceptibility to contamination, rather a approximately 40% reduction in richness occurred across all habitats. No class of contaminant was associated with significantly greater impacts on diversity than any other. Survey studies identified larger effects than laboratory or field experiments. Anthropogenic contamination is strongly associated with reductions in the species richness and evenness of marine habitats.
authors.affiliation: Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia. e.johnston@unsw.edu.au
authors.forename: Emma L
authors.initials: EL
authors.lastname: Johnston
authors.forename: David A
authors.initials: DA
authors.lastname: Roberts
mesh_terms: D000818:Animals; D044822:Biodiversity; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004784:Environmental Monitoring / Q000706:statistics & numerical data; D004787:Environmental Pollution / Q000009:adverse effects*; D008386:Marine Biology; D009792:Oceans and Seas; D011157:Population Dynamics