Polymorphism in a common Atlantic reef coral (Montastraea cavernosa) and its long-term evolutionary implications

Budd, Ann F., Nunez, Flavia L. D., Weil, Ernesto and Pandolfi, John M. (2012) Polymorphism in a common Atlantic reef coral (Montastraea cavernosa) and its long-term evolutionary implications. Evolutionary Ecology, 26 2: 265-290. doi:10.1007/s10682-010-9460-8


Author Budd, Ann F.
Nunez, Flavia L. D.
Weil, Ernesto
Pandolfi, John M.
Title Polymorphism in a common Atlantic reef coral (Montastraea cavernosa) and its long-term evolutionary implications
Formatted title
Polymorphism in a common Atlantic reef coral (Montastraea cavernosa) and its long-term evolutionary implications
Journal name Evolutionary Ecology   Check publisher's open access policy
ISSN 0269-7653
1573-8477
Publication date 2012-03
Year available 2011
Sub-type Article (original research)
DOI 10.1007/s10682-010-9460-8
Volume 26
Issue 2
Start page 265
End page 290
Total pages 26
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2012
Language eng
Formatted abstract
Recent advances in morphometrics and genetics have led to the discovery of numerous cryptic species in coral reef ecosystems. A prime example is the Montastraea annularis scleractinian coral species complex, in which morphological, genetic, and reproductive data concur on species boundaries, allowing evaluation of long-term patterns of speciation and evolutionary innovation. Here we test for cryptic species in the Atlantic species, Montastraea cavernosa, long recognized as polymorphic. Our modern samples consist of 94 colonies collected at four locations (Belize, Panamá, Puerto Rico in the Caribbean; São Tomé in the Eastern Atlantic). Our fossil samples consist of 78 colonies from the Plio-Pleistocene of Costa Rica and Panamá. Landmark morphometric data were collected on thin sections of 46 modern and 78 fossil colonies. Mahalanobis distances between colonies were calculated using Bookstein coordinates, revealing two modern and four fossil morphotypes. The remaining 48 of the 94 modern colonies were assigned to morphotype using discriminant analysis of calical measurements. Cross-tabulation and multiple comparisons tests show no significant morphological differences among geographic locations or water depths. Patterns of variation within and among fossil morphotypes are similar to modern morphotypes. DNA sequence data were collected for two polymorphic nuclear loci (β-tub1 and β-tub2) on all 94 modern colonies. Haplotype networks show that both genes consist of two clades, but morphotypes are not associated with genetic clades. Genotype frequencies and two-locus genotype assignments indicate genetic exchange across clades, and φst values show no genetic differentiation between morphotypes at different locations. Taken together, our morphological and genetic results do not provide evidence for cryptic species in M. cavernosa, but indicate instead that this species has an unusually high degree of polymorphism over a wide geographic area and persisting for >25 million years (myr).
Keyword Cryptic species
Coral reef
Carribean
Geometric morphometrics
β-tubulin
Neogene
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Online First - 20 January 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
Centre for Marine Studies Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 12 Sep 2011, 13:03:27 EST by Gail Walter on behalf of School of Biological Sciences