Document Detail

Sympatric populations of the highly cross-fertile coral species Acropora hyacinthus and Acropora cytherea are genetically distinct.
MedLine Citation:
PMID:  12065046     Owner:  NLM     Status:  MEDLINE    
High cross-fertilization rates in vitro and non-monophyletic patterns in molecular phylogenies challenge the taxonomic status of species in the coral genus Acropora. We present data from eight polymorphic allozyme loci that indicate small, but significant, differentiation between sympatric populations of Acropora cytherea and Acropora hyacinthus (F(ST) = 0.025-0.068, p < 0.05), a pair of acroporid corals with very high interspecific fertilization rates in vitro. Although no fixed allelic differences were found between these species, the absence of genetic differentiation between widely allopatric populations suggests that allele frequency differences between A. cytherea and A. hyacinthus in sympatry are biologically significant. By contrast, populations of Acropora tenuis, a species which spawns 2-3 hours earlier and shows low cross-fertilization rates with congeners in vitro, were clearly distinct from A. cytherea and A. hyacinthus (F(ST) = 0.427-0.465, p < 0.05). Moreover, allopatric populations of A. tenuis differed significantly, possibly as a consequence of its relatively short period of larval competency. Our results effectively rule out the possibility that A. hyacinthus and A. cytherea are morphotypes within a single species, and indicate that hybridization occurs relatively infrequently between these taxa in nature.
L M Márquez; M J H van Oppen; B L Willis; D J Miller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  269     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-06-14     Completed Date:  2003-01-13     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  1289-94     Citation Subset:  IM    
Department of Biochemistry and Molecular Biology, James Cook University, Townsville 4811, Australia.
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MeSH Terms
Anthozoa / classification*,  enzymology,  genetics*,  physiology
Enzymes / analysis
Gene Frequency
Genetic Variation*
Genetics, Population*
Reg. No./Substance:

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