Phenotypic variation in the coral Platygyra daedalea in Kenya: morphometry and genetics
2007 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 345, 105-115 p.Article in journal (Refereed) Published
High intraspecific variability and lack of adequate field descriptions or distinguishing skeletal features has made identification of the scleractinian coral Platygyra daedalea challenging. This species displays a number of distinct morphological types that co-occur on lagoonal reefs in Kenya and which often cannot be separated by field observations. To better understand how morphological and genetic variations are related, morphometric and molecular techniques were used to examine phenotypic variation in P. daedalea. A canonical discriminant analysis of measurements of 10 skeletal characters confirmed the existence of 2 morphotypes. No single diagnostic trait could be used to distinguish the 2 morphotypes, though a combination of 4 characters separated them. A mathematical equation is presented to separate colonies into the 2 morphotypes, where field identification is not possible. Genetic differentiation was studied using 5 microsatellite loci and sequence analysis of the internal transcriber spacer (ITS1 and ITS2) and 5.8S region of the nuclear ribosomal RNA gene. AMOVA of the microsatellite and ITS sequence data showed significant genetic differences between the 2 morphotypes. However, phylogenetic analysis of the ITS sequences showed no evidence of sequence divergence between morphotypes, which suggests that they share a gene pool, or that the genetic divergence is recent. We conclude that the occurrence of distinct morphotypes is a characteristic of P. daedalea and that there does appear to be a genetic basis for separating morphotypes. However, genetic differences in P. daedalea could only be detected when combined with morphometric data.
Place, publisher, year, edition, pages
2007. Vol. 345, 105-115 p.
IdentifiersURN: urn:nbn:se:sh:diva-5566DOI: 10.3354/meps07013ISI: 000250195800010ScopusID: 2-s2.0-35348898931OAI: oai:DiVA.org:sh-5566DiVA: diva2:389062
In dissertation In press: Understanding phenotypic variation in the scleractinian coral Platygyra daedalea (Ellis & Solander 1786) in Kenyan lagoonal reefs through morphometric and genetic studies2011-01-182011-01-182014-10-27Bibliographically approved