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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spatial demographic and genetic consequences of harvesting within populations of the terrestrial orchid Cymbidium goeringii
Auteurs :	Mi Yoon Chung, Auteur ; John D. Nason, Auteur
Type de document :	Article
Dans :	Biological Conservation (137(1) JUN 2007)
Article en page(s) :	125-137
Langues:	Anglais
Résumé :	Populations of many orchids, especially terrestrial species, have been rapidly decreasing due to mass collection by plant sellers and enthusiasts. Given the presumably negative demographic and genetic consequences, such anthropogenic activity should be taken into consideration for predicting ecological and evolutionary dynamics and for planning conservation strategies. To determine how recent human disturbance alters spatial demographic and population genetic processes, populations of the terrestrial orchid Cymbidium goeringii located in South Korea were examined to quantify the spatial distributions of individuals and genotypes with respect to three levels of disturbance: "disturbed" (four populations), "putatively disturbed" (two), and "undisturbed" (two). Undisturbed and putatively disturbed populations were found to possess significantly positive spatial clustering of individuals over a range of spatial scales. In contrast, disturbed populations exhibited little or no spatial aggregation, consistent with the selective removal of plants by collectors from higher density areas within these populations. Although overall genetic differentiation among populations was moderate and significant (F(ST) = 0.082), levels of genetic diversity within populations were similar despite the different disturbance histories (mean H(e) = 0.257-0.324). Spatial genetic autocorrelation analyses revealed that the undisturbed populations exhibited significant declines in kinship (F(ij)) with distance, that mean kinship at interplant distances of

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