The impact of local extinction on genetic structure of wild populations of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica: consequences for the conservation of plant genetic resources

Barrantes, Daniel; Macaya Trejos, Gabriel; Guarino, Luigi; Bouduin, Jean Pierre; Rocha, Oscar J.

dc.creator	Barrantes, Daniel
dc.creator	Macaya Trejos, Gabriel
dc.creator	Guarino, Luigi
dc.creator	Bouduin, Jean Pierre
dc.creator	Rocha, Oscar J.
dc.date	2007-04-30
dc.date.accessioned	2016-05-03T15:36:12Z
dc.date.available	2016-05-03T15:36:12Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/5690
dc.identifier	10.15517/rbt.v56i3.5690
dc.identifier.uri	https://hdl.handle.net/10669/27645
dc.description	Plant populations may experience local extinction and at the same time new populations may appear in nearby suitable locations. Species may also colonize the same site on multiple occasions. Here, we examined the impact of local extinction and recolonization on the genetic structure of wild populations of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica. We compared genetic diversity from the samples taken from the populations before and after extinction at 13 locations using microsatellite markers. Locations were classified according to the occurrence of extinction episodes during the previous five years into three groups: 1) populations that experienced extinction for more than one year, and were later recolonized (recolonized), 2) populations that did not experience local extinction (control), and 3) populations that did not experience local extinction during the study, but were cut to experimentally simulate extinction (experimental). Our data did not show a clear tendency in variation in allele frequencies, expected heterozygosity, and effective number of alleles within and between groups of populations. However, we found that the level of genetic differentiation between samples collected at different times at the same location was different in the three groups of populations. Recolonized locations showed the highest level of genetic differentiation (mean Fst = 0.2769), followed by control locations (mean Fst = 0.0576) and experimental locations (mean Fst = 0.0189). Similar findings were observed for Nei's genetic distance between samples (di,j = 0.1786, 0.0400, and 0.0037, respectively). Our results indicate that genetic change in lima beans depends on the duration and frequency of local extinction episodes. These findings also showed that control populations are not in equilibrium. Implications of these results for the establishment of conservation strategies of genetic resources of lima beans are discussed.	en-US
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 56 (3) September 2008	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 56 (3) September 2008	es-ES
dc.source	Revista Biología Tropical; Vol. 56 (3) September 2008	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v56i3
dc.title	The impact of local extinction on genetic structure of wild populations of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica: consequences for the conservation of plant genetic resources	en-US
dc.title	The impact of local extinction on genetic structure of wild populations of lima beans (Phaseolus lunatus) in the Central Valley of Costa Rica: consequences for the conservation of plant genetic resources	es-ES
dc.type	artículo original
dc.coverage	CRC	en-US

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