High genetic diversity in geographically remote populations of endemic and widespread coral reef angelfishes (genus: Centropyge)

Hobbs, Jean-Paul, van Herwerden, Lynne, Jerry, Dean R., Jones, Geoffrey P., and Munday, Philip L. (2013) High genetic diversity in geographically remote populations of endemic and widespread coral reef angelfishes (genus: Centropyge). Diversity, 5 (1). pp. 39-50.

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In the terrestrial environment, endemic species and isolated populations of widespread species have the highest rates of extinction partly due to their low genetic diversity. To determine if this pattern holds in the marine environment, we examined genetic diversity in endemic coral reef angelfishes and isolated populations of widespread species. Specifically, this study tested the prediction that angelfish (genus: Centropyge) populations at Christmas and Cocos Islands have low genetic diversity. Analyses of a 436 base pair fragment of the mtDNA control region revealed that the endemic C. joculator exhibited high haplotype (h > 0.98 at both locations) and nucleotide (Christmas p% = 3.63, Cocos p% = 9.99) diversity. Similarly, isolated populations of widespread angelfishes (C. bispinosa and C. flavicauda) had high haplotype (h > 0.98) and nucleotide (p% = 2.81 and p% = 5.78%, respectively) diversity. Therefore, in contrast to terrestrial patterns, endemic and isolated populations of widespread angelfishes do not have low genetic diversity, rather their haplotype and nucleotide diversities were among the highest reported for marine fishes. High genetic diversity should reduce extinction risk in these species as it could provide the evolutionary potential to adapt to the rapidly changing environmental conditions forecast for coral reefs.

Item ID: 28417
Item Type: Article (Research - C1)
ISSN: 1424-2818
Keywords: extinction risk, haplotype diversity, nucleotide diversity, genetic diversity, Pomacanthidae, Christmas Island, Cocos (Keeling) Islands, endemic species, isolated and widespread populations, evolutionary potential
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This article is produced under the terms and conditions of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/).

Date Deposited: 15 Aug 2013 06:08
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 50%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060311 Speciation and Extinction @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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