Genetic recolonization of mangrove: genetic diversity still increasing in the Mekong Delta 30 years after Agent Orange

Title:	Genetic recolonization of mangrove: genetic diversity still increasing in the Mekong Delta 30 years after Agent Orange
Authors:	Nguyen, Hong Tri Phan, Nguyen Hong Sophie, Arnaud-Haond
Keywords:	Recolonization genetics;Genetic recovery;Demographic recovery;Local extinction;Mangrove;Deforestation
Issue Date:	2009
Publisher:	INTER-RESEARCH, NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY
Citation:	ISIKNOWLEDGE
Abstract:	The widespread use of Agent Orange (a mixture of phenoxyl herbicides) over Southern Vietnam by US Forces led to the decimation of mangrove forests in the Mekong Delta. Mangrove trees Avicennia albawere sampled across the Mekong Delta; their age was assessed using models based on internode growth and samples were genotyped for 6 microsatellite loci. The evolution of genetic diversity over time elapsed since local extinction was reconstructed and compared with the genetic diversity of an unaffected population from Thailand. The results show that genetic diversity of the A. albapopulation is still increasing in the Mekong Delta 3 decades after the end of the Viet-nam War, but is reaching an asymptotic level that is comparable to the adjacent non-affected popu-lation of Thailand. This might be a sign of genetic recovery, but may also reveal a limitation, either of genetic enrichment due to current predominance of auto-recruitment or of demographic increase due to intraspecific competition in this pioneer species. In any case, these results, although encouraging, demonstrate that genetic recovery after complete or almost complete population depletion continues over a longer time-scale than apparent demographic recovery
Description:	TNS07515 ; MARINE ECOLOGY PROGRESS SERIES Volume: 390 Pages: 129-135
URI:	http://repository.vnu.edu.vn/handle/VNU_123/30652 http://www.int-res.com/abstracts/meps/v390/p129-135/
ISSN:	0171-8630
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