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• W2012806430 abstract "The multi-component aspect of species diversity of groundfish assemblages was examined on the basis of a set of experimental trawl surveys conducted on the continental shelf of the Gulf of Lions. The structure of species diversity was investigated through the simultaneous analysis of indices relating to 4 diversity components: (1) the number of species (species density S and Margalef's Dmg index), (2) rarity (number of species with less than 5% of occurrence), (3) evenness (Heip's EHeip and Berger–Parker's 1/d indices) and (4) taxonomic diversity (Δ, Δ∗, Δ+, Λ+). In addition, two popular heterogeneous indices (Simpson's 1 − D and Shannon's H' indices) combining the number of species and evenness were also considered. PCA based on Spearman's correlation coefficients was carried out to investigate empirical relationships between these 11 indices while generalized linear models (GLMs) were used to analyse diversity patterns in relation to bathymetry. Our results showed that the 11 species diversity indices studied might be grouped into 6 complementary components: (1) number of species (species density S and Margalef's Dmg index), (2) evenness (EHeip, 1/d, H′, 1 − D, Δ), (3) rarity and each of the 3 other measures of taxonomy: (4) Δ∗, (5) Δ+, and (6) Λ+. This result showed not only that a single diversity index cannot provide a complete description of species diversity but also that – in some cases – it cannot even encapsulate a complete description of a specific diversity component. In addition, in contrast to their expected theoretical properties, some descriptors appeared to be redundant in our field study. Finally, we found that the influence of depth on diversity patterns is usually significant but weak and varies according to the diversity components considered. Our findings – which show that diversity descriptors may respond in different ways to habitat degradation or loss – highlight the complexity of defining priority areas of protection taking simultaneously into account the main characteristics of diversity." @default.
• W2012806430 created "2016-06-24" @default.
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• W2012806430 date "2007-06-01" @default.
• W2012806430 modified "2023-09-29" @default.
• W2012806430 title "A multi-component analysis of species diversity of groundfish assemblages on the continental shelf of the Gulf of Lions (north-western Mediterranean Sea)" @default.
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• W2012806430 doi "https://doi.org/10.1016/j.ecss.2006.12.017" @default.
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