Data/hora: 06/06/2024 02:07:45

Provedor de dados: 	5	
País: 	France	
Título: 	Comparative Analysis of Stability-Genetic Diversity in Seagrass (Posidonia oceanica) Meadows Yields Unexpected Results	
Autores: 	Arnaud-haond, Sophie; Marba, Nuria; Diaz-almela, Elena; Serrao, Ester A.; Duarte, Carlos M.	
Data: 	2010-07	
Ano: 	2010	
Palavras-chave: 	Seagrass; Demography; Clonality; Genetic richness; Diversity-stability; Posidonia oceanica.	
Resumo: 	The diversity-stability relationship is the subject of a long-standing debate in ecology, but the genetic component of diversity has seldom been explored. In this study, we analyzed the interplay between genetic diversity and demographic responses to environmental pressures. This analysis included 30 meadows formed by the Mediterranean endemic seagrass, Posidonia oceanica, showing a wide range of population dynamics ranging from a near equilibrium state to steep decline due to strong environmental pressures close to aquaculture installations. Our results show that sedimentation rates are much better predictors of mortality than clonal or genetic components. An unexpected positive trend was observed between genotypic diversity and mortality, along with a negative relationship between allelic richness and net population growth. Yet such trends disappeared when excluding the most extreme cases of disturbance and mortality, suggesting the occurrence of a threshold below which no relationship exists. These results contrast with the positive relationship between genotypic diversity and resistance or resilience observed in previous manipulative experiments on seagrass. We discuss the reasons for this discrepancy, including the difficulties in designing experiments reflecting the complexity of natural meadows.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00006/11693/8498.pdf

DOI:10.1007/s12237-009-9238-9	
Editor: 	Springer	
Relação: 	http://archimer.ifremer.fr/doc/00006/11693/	
Formato: 	application/pdf	
Fonte: 	Estuaries And Coasts (1559-2723) (Springer), 2010-07 , Vol. 33 , N. 4 , P. 878-889	
Fonte: 	2010 Springer. Part of Springer Science+Business Media