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Estudi en l’espai i el temps de poblacions del cranc marí Liocarcinus depurator mitjançant el gen mitrocondrial coi

AuthorsOjeda Martín, Víctor
AdvisorMestres, Francesc; Abelló, Pere
Issue Date7-Sep-2015
PublisherUniversidad de Barcelona
AbstractIn Marine Biology, the traditional thought was that dispersion of species was rather homogenous through seas given the lack of evident barriers to dispersion. However, scientists soon evidenced the occurrence of some oceanographic discontinuities. In the present research we have analyzed the spatial and temporal genetic differentiation of the marine crab Liocarcinus depurator populations across the three permanent or semipermanent oceanographic discontinuities found along the western Mediterranean: Gibraltar Straits, Almeria-Oran Front and Ibiza Channel. A partial fragment of the Cytochrome oxidase I gene (527 pb) was sequenced in 146 individuals collected in five localities (Cadis, West Alboran, Alacant, València and Delta de l’Ebre) during 2014 and 35 individuals collected in Delta de l’Ebre in 2007. The sequences obtained from these individuals were used to complete a temporal study about the genetic structure of this crab in four different periods. We have analyzed their genetic composition through time, the effects of oceanographic discontinuities over the gene flow, and whether these discontinuities were permanent or not. According to our results, we conclude that L. depurator presents two haplogroups: One most frequently found in Cadiz and West Alboran (“Atlantic”), and the other in Alacant, Valencia and Delta de l’Ebre (“Mediterranean”). From a temporal point of view, haplotype frequencies are not stable within populations, gene flow is asymmetric, and the oceanographic discontinuities are not permanent. The present study highlights the importance of temporal replicates to better understand the spatial genetic structure of marine species and implement better management strategies for their conservation
DescriptionTrabajo final presentado por Víctor Ojeda Martín para el Master en Genética y Genómica de la Universitat de Barcelona (UB), realizado bajo la dirección del Dr. Francesc Mestres Naval de la Universitat de Barcelona (UB) y del Dr. Pere Abelló Sala del Institut de Ciències del Mar (ICM-CSIC).-- 30 pages, 6 figures, 3 tables, supplemental material
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