Data/hora: 26/07/2024 22:45:34

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Hierarchical drivers of reef-fish metacommunity structure	
Autores: 	Macneil, M. Aaron; Graham, Nicholas A. J.; Polunin, Nicholas V. C.; Kulbicki, Michel; Galzin, Rene; Harmelin-vivien, Mireille; Rushton, Steven P.	
Data: 	2009-01	
Ano: 	2009	
Palavras-chave: 	Alpha; Beta; And gamma diversity biodiversity coral reefs ecological scales habitat structure mixed-effects models multiple working hypotheses; Reef-fish biomass species abundance species richness.	
Resumo: 	Coral reefs are highly complex ecological systems, where multiple processes interact across scales in space and time to create assemblages of exceptionally high biodiversity. Despite the increasing frequency of hierarchically structured sampling programs used in coral-reef science, little progress has been made in quantifying the relative importance of processes operating across multiple scales. The vast majority of reef studies are conducted, or at least analyzed, at a single spatial scale, ignoring the implicitly hierarchical structure of the overall system in favor of small-scale experiments or large-scale observations. Here we demonstrate how alpha (mean local number of species), beta diversity (degree of species dissimilarity among local sites), and gamma diversity (overall species richness) vary with spatial scale, and using a hierarchical, information-theoretic approach, we evaluate the relative importance of site-, reef-, and atoll-level processes driving the fish metacommunity structure among 10 atolls in French Polynesia. Process-based models, representing well-established hypotheses about drivers of reef-fish community structure, were assembled into a candidate set of 12 hierarchical linear models. Variation in fish abundance, biomass, and species richness were unevenly distributed among transect, reef, and atoll levels, establishing the relative contribution of variation at these spatial scales to the structure of the metacommunity. Reef-fish biomass, species richness, and the abundance of most functional-groups corresponded primarily with transect-level habitat diversity and atoll-lagoon size, whereas detritivore and grazer abundances were largely correlated with potential covariates of larval dispersal. Our findings show that (1) within-transect and among-atoll factors primarily drive the relationship between alpha and gamma diversity in this reef-fish metacommunity; (2) habitat is the primary correlate with reef fish metacommunity structure at multiple spatial scales; and (3) inter-atoll connectedness was poorly correlated with the nonrandom clustering of reef-fish species. These results demonstrate the importance of modeling hierarchical data and processes in understanding reef-fish metacommunity structure.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00207/31782/30195.pdf

DOI:10.1890/07-0487.1

https://archimer.ifremer.fr/doc/00207/31782/	
Editor: 	Ecological Soc Amer	
Formato: 	application/pdf	
Fonte: 	Ecology (0012-9658) (Ecological Soc Amer), 2009-01 , Vol. 90 , N. 1 , P. 252-264	
Fonte: 	2009 by the Ecological Society of America

info:eu-repo/semantics/openAccess

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