Ability of taxonomic diversity indices to discriminate coastal lagoon environments based on macrophyte communities

Type Article
Date 2005
Language English
Author(s) Mouillot David1, Gaillard Sylvain1, Aliaume Catherine1, Verlaque Marc2, Belsher Thomas3, Troussellier Marc1, Chi Thang1
Affiliation(s) 1 : Univ Montpellier 2, UMR,UMII 5119, CNRS, F-34095 Montpellier 5, France.
2 : Univ Mediterranee, UMR 6540, Ctr Oceanol Marseille, F-13288 Marseille, France.
3 : IFREMER, Stn Sete, F-34203 Sete, France.
Source Ecological Indicators (1470-160X) (Elsevier), 2005 , Vol. 5 , N. 1 , P. 1-17
DOI 10.1016/j.ecolind.2004.04.004
WOS© Times Cited 79
Keyword(s) Languedoc Roussillon, Exotic species, Human impact, Eutrophication, Biodiversity
Abstract Lagoons are highly productive areas representing more than 50% of the coastline area in Languedoc-Roussillon (South of France, Mediterranean sea). These lagoons are very different in their environmental conditions, human influences, eutrophication levels and aquaculture intensity. Based on macrophyte communities associated with soft substrates, two indices of taxonomic diversity (the "average taxonomic distinctness" (Delta(+)) and the "variation in taxonomic distinctness" (Lambda(+))) were used to discriminate four of these lagoons (Thau, Salse-Leucate, Bages-Sigean and Mauguio). Bages-Sigean presented a significant higher average taxonomic distinctness (p < 0.05) and Salse-Leucate had a significant higher variation in taxonomic distinctness (p < 0.05) without considering exotic species. The index values were neither influenced by sample size nor by presence of exotic species. Thus, the "average taxonomic distinctness" was related to human activities and eutrophication level whereas the "variation in taxonomic distinctness" was more related the environmental variability, associated with the prime stressor of salinity in brackish coastal lagoons.
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