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Microsatellite markers reveal shallow genetic differentiation between cohorts of the common sea urchin Paracentrotus lividus (Lamarck) in northwestern Mediterranen

AuthorsCalderón, I.; Palacín, Cruz ; Turon, Xavier
KeywordsSea urchins
Effective population size
Microsatellite loci
Issue Date2009
CitationMolecular Ecology 18 : 3036-3049 (2009)
AbstractTemporalvariabilitywasstudiedinthecommonseaurchinParacentrotuslividusthroughthe analysis of the genetic composition of three yearly cohorts sampled over two consecutive springsinalocalityinnorthwesternMediterranean.Individualswereagedusinggrowthring patterns observed in tests and samples were genotyped for five microsatellite loci. No reduction of genetic diversitywasobserved relative to asampleof the adult populationfrom the same location or within cohorts across years. FST and AMOVA results indicated that the differentiation between cohorts is rather shallow and not significant, as most variability is found within cohorts and within individuals. This mild differentiation translated into estimates of effective population size of 90–100 individuals. When the observed excess of homozygoteswastakenintoaccount,theestimateoftheaveragenumberofbreedersincreased to c. 300 individuals. Given our restricted sampling area and the known small-scale heterogeneity in recruitment in this species, our results suggest that at stretches of a few kilometresofshoreline,largenumbersofprogenitorsarelikelytocontributetothelarvalpool at each reproduction event. Intercohort variation in our samples is six times smaller than spatial variation between adults of four localities in the western Mediterranean.Ourresults indicatethat,notwithstandingthestochasticeventsthattakeplaceduringthelongplanktonic phase and during the settlement and recruitment processes, reproductive success in this species is high enough to produce cohorts genetically diverse and with little differentiation between them. Further research is needed before the link between genetic structure and underlying physical and biological processes can be well established.
Description14 Páginas ; 5 Figuras ; 4 Tablas ; 1 Apéndice
Publisher version (URL)http://dx.doi.org/10.1111/j.1365-294X.2009.04239.x
Appears in Collections:(CEAB) Artículos
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