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Integrative study of marine clines: genetic and morphological gradients in the portunid crab Liocarcinus depurator

AutorMacpherson, Enrique ; Abelló, Pere ; García-Merchán, V. H.; Palero, Ferran ; Robainas-Barcia, A.; Rufino, Marta M.
Fecha de publicación21-ago-2014
Citación8th International Crustacean Congress. Abstract volume: 118 (2014)
ResumenGenetic clines, that is, geographic zones in which genetically differentiated populations interbreed, occur throughout the oceans (AVISE 2001). Because the width and shape of genetic clines commonly represent an evolutionary balance between selection and dispersal, clines provide researchers with the ability to powerfully analyze both evolutionary forces simultaneously. In this study, the population structure of the portunid crab Liocarcinus depurator was assessed using both genetic and morphology data collected from a total of 10 areas along the Mediterranean Sea and the Atlantic Ocean. One mitochondrial gene (COI) was sequenced in 287 individuals and 280 individuals were genotyped using 11 polymorphic microsatellite markers. Furthermore, a geometric morphological analysis was performed in a larger collection of 350 crabs from both Mediterranean and Atlantic waters. The sampling design allowed us to detect the level and pattern of differentiation between populations, and define barriers for dispersal. After carrying out an integrated cline analysis of both genetic and morphological data, the presence of significant genetic gradients was discovered for both the mitochondrial (cline width = 0.291 - 0.396) and nuclear (cline width = 0.505 - 0.789) markers. The analyses of morphological shape changes along space did not show any significant gradient (cline width = -0.023 - 0.028). Our results indicate a clear reduction of gene flow between Atlantic and Mediterranean populations, with a stronger reduction in mtDNA than microsatellites. This could be related to different effective sizes in both the nuclear and the mitochondrial genomes, to different selective pressures or to different migration rates in males and females
Descripción8th International Crustacean Congress (ICC-8), 18-23 August 2014, Frankfurt am Main.-- 1 page
Versión del editorhttp://www.senckenberg.de/root/index.php?page_id=15713&preview=true
Aparece en las colecciones: (ICM) Comunicaciones congresos
(CEAB) Comunicaciones congresos
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