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Implications of extreme life span in clonal organisms: millenary clones in mead...
ARNAUD-HAOND, Sophie; Duarte, C. M.; Diaz-Almela, E.; Marbà, N.; Sintes, T.; Serrão, EsterThe maximum size and age that clonal organisms can reach remains poorly known, although we do know that the largest natural clones can extend over hundreds or thousands of metres and potentially live for centuries. We made a review of findings to date, which reveal that the maximum clone age and size estimates reported in the literature are typically limited by the scale of sampling, and may grossly underestima...
Comparative analysis of stability-genetic diversity in seagrass (Posidonia ocea...
ARNAUD-HAOND, Sophie; Marbà, N.; Diaz-Almela, E.; Serrão, Ester; Duarte, C. M.The diversity–stability relationship is the subject of a long-standing debate in ecology, but the genetic component of diversity has seldom been explored. In this study, we analyzed the interplay between genetic diversity and demographic responses to environmental pressures. This analysis included 30 meadows formed by the Mediterranean endemic seagrass, Posidonia oceanica, showing a wide range of population dyn...
Genetic differentiation and secondary contact zone in the seagrass Cymodocea no...
Alberto, F.; Massa, S. I.; Manent, P.; Diaz-Almela, E.; ARNAUD-HAOND, Sophie; Duarte, C. M.; Serrão, EsterAim A central question in evolutionary ecology is the nature of environmental barriers that can limit gene flow and induce population genetic divergence, a first step towards speciation. Here we study the geographical barrier constituted by the transition zone between the Atlantic Ocean and the Mediterranean Sea, using as our model Cymodocea nodosa, a seagrass distributed throughout the Mediterranean and in th...
Vicariance patterns in the Mediterranean Sea: East-west cleavage and low disper...
ARNAUD-HAOND, Sophie; Migliaccio, M.; Diaz-Almela, E.; Teixeira, Sara; Van De Vliet, M. S.; Alberto, F.; Procaccini, G.; Duarte, C. M.; Serrão, EsterAim The seagrass, Posidonia oceanica is a clonal angiosperm endemic to the Mediterranean Sea. Previous studies have suggested that clonal growth is far greater than sexual recruitment and thus leads to low clonal diversity within meadows. However, recently developed microsatellite markers indicate that there are many different genotypes, and therefore many distinct clones present. The low resolution of markers...
Feed-backs between genetic structure and perturbation-driven decline in seagras...
Diaz-Almela, E.; ARNAUD-HAOND, Sophie; Vliet, M. S.; Álvarez, E.; Marbà, N.; Duarte, C. M.; Serrão, EsterWe explored the relationships between perturbation-driven population decline and genetic/genotypic structure in the clonal seagrass Posidonia oceanica, subject to intensive meadow regression around four Mediterranean fish-farms, using seven specific microsatellites. Two meadows were randomly sampled (40 shoots) within 1,600 m2 at each site: the “impacted” station, 5–200 m from fish cages, and the “control” stat...