Molecular phylogenetics of geographically restricted Acropora species: implications for threatened species conservation

Richards, Z.T., Miller, D.J., and Wallace, C.C. (2013) Molecular phylogenetics of geographically restricted Acropora species: implications for threatened species conservation. Molecular Phylogenetics and Evolution, 69 (3). pp. 837-851.

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Abstract

To better understand the underlying causes of rarity and extinction risk in Acropora (staghorn coral), we contrast the minimum divergence ages and nucleotide diversity of an array of species with different range sizes and levels of threat. Time-calibrated Bayesian analyses based upon concatenated nuclear and mitochondrial sequence data implied contemporary range size and vulnerability are linked to species age. However, contrary to previous hypotheses that suggest geographically restricted Acropora species evolved in the Plio-Pleistocene, the molecular phylogeny depicts some Indo-Australian species have greater antiquity, diverging in the Miocene. Species age is not related to range size as a simple positive linear function and interpreting the precise tempo of evolution in this genus is greatly complicated by morphological homoplasy and a sparse fossil record. Our phylogenetic reconstructions provide new examples of how morphology conceals cryptic evolutionary relationships in this keystone genus, and offers limited support for the species groupings currently used in Acropora systematics. We hypothesize that in addition to age, other mechanisms (such as a reticulate ancestry) delimit the contemporary range of some Acropora species, as evidenced by the complex patterns of allele sharing and paraphyly we uncover. Overall, both new and ancient evolutionary information may be lost if geographically restricted and threatened Acropora species are forced to extinction. In order to protect coral biodiversity and resolve the evolutionary history of staghorn coral, further analyses based on comprehensive and heterogeneous morphological and molecular data utilizing reticulate models of evolution are needed.

Item ID: 30546
Item Type: Article (Research - C1)
ISSN: 1095-9513
Keywords: Scleractinia, rare, introgression, mitochondrial control region, single-copy nuclear intron, molecular clock
Projects and Grants: Queensland Smart State Fellowship, International Society for Coral Reef Studies Fellowship, Australian Museum, Woodside Energy
Date Deposited: 11 Dec 2013 09:13
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060311 Speciation and Extinction @ 35%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060301 Animal Systematics and Taxonomy @ 30%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060409 Molecular Evolution @ 35%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 30%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 70%
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