Conservation genetics of the east Pacific green turtle (Chelonia mydas) in Michoacan, Mexico

Genetica
Omar Chassin-NoriaKen Oyama

Abstract

The main continental nesting rookeries of the east Pacific green turtle (EPGT), Chelonia mydas, on the Michoacan (Mexico) coast suffered drastic population declines following intense exploitation in the 1960s--1970s with annual abundance of nesting females plummeting from about 25,000 to an average of about 1400 between 1982 and 2001. Analyses of data from three nDNA microsatellite loci and 400 bp mtDNA control region sequences from a total of 123 nesting females sampled from four Michoacan rookeries found no evidence of population sub-structuring. The recent order of magnitude reduction in the population size shows no apparent impact on genetic diversity in either control region sequences (overall h = 0.48; pi = 0.0036) or microsatellite loci (overall Na = 20.8; Hexp = 0.895). Our estimates of annual effective female population size (Nef; from theta = 2Nemicron) of 1.9-2.3 x 10(3), in spite of being an order of magnitude below historical records, appear to be sufficient to allow recovery of this population without significant loss of genetic diversity. These findings highlight the importance of continued conservation to reverse the decline of this population before it becomes vulnerable to genetic erosion.

Citations

Mar 18, 2006·Proceedings. Biological Sciences·Micheline GrilletJean-François Ferveur
Jan 24, 2014·Journal of the Royal Society, Interface·Eugenia Naro-MacielEleanor J Sterling
Oct 10, 2006·Genetica·Mariana Pires de Campos TellesJosé Alexandre Felizola Diniz-Filho
Feb 14, 2009·Forensic Science International. Genetics·James Chun-I LeeHsing-Mei Hsieh
Oct 20, 2007·Molecular Ecology·B W Bowen, S A Karl
Dec 22, 2006·Molecular Ecology·Patricia L M LeeGraeme C Hays
Oct 27, 2015·Genetics and Molecular Biology·Juliana Costa JordãoLurdes Foresti de Almeida Toledo

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