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Entangled effects of allelic and clonal (genotypic) richness in the resistance ...
Massa, S. I.; Paulino, Cristina M.; Serrão, Ester; Duarte, C. M.; Arnaud-Haond, S.Background - The relationship between species diversity and components of ecosystem stability has been extensively studied, whilst the influence of the genetic component of biodiversity remains poorly understood. Here we manipulated both genotypic and allelic richness of the seagrass Zostera noltii, in order to explore their respective influences on the resistance of the experimental population to stress. Thus ...
Invasion is a community affair: clandestine followers in the bacterial communit...
Aires, T.; Serrão, Ester; Kendrick, G.; Duarte, C. M.; Arnaud-Haond, S.Biological invasions rank amongst the most deleterious components of global change inducing alterations from genes to ecosystems. The genetic characteristics of introduced pools of individuals greatly influence the capacity of introduced species to establish and expand. The recently demonstrated heritability of microbial communities associated to individual genotypes of primary producers makes them a potentiall...
Genetic flow directionality and geographical segregation in a Cymodocea nodosa...
Masucci, A. P.; Arnaud-Haond, S.; Eguíluz, V. M.; Hernández-García, E.; Serrão, EsterWe analyse a large data set of genetic markers obtained from populations of Cymodocea nodosa, a marine plant occurring from the East Mediterranean to the Iberian-African coasts in the Atlantic Ocean. We fully develop and test a recently introduced methodology to infer the directionality of gene flow based on the concept of geographical segregation. Using the Jensen-Shannon divergence, we are able to extract a d...
Implications of extreme life span in clonal organisms: millenary clones in mead...
Arnaud-Haond, S.; 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...
Panmixia in a fragmented and unstable environment: the hydrothermal shrimp Rimi...
Teixeira, S.; Serrão, Ester; Arnaud-Haond, S.Dispersal plays a fundamental role in the evolution and persistence of species, and especially for species inhabiting extreme, ephemeral and highly fragmented habitats as hydrothermal vents. The Mid-Atlantic Ridge endemic shrimp species Rimicaris exoculata was studied using microsatellite markers to infer connectivity along the 7100-Km range encompassing the sampled sites. Astonishingly, no genetic differentiat...
Travelling in time with networks: revealing present day hybridization versus an...
Moalic, Y.; Arnaud-Haond, S.; Perrin, C.; Pearson, G. A.; Serrão, EsterBackground: Hybridization or divergence between sympatric sister species provides a natural laboratory to study speciation processes. The shared polymorphism in sister species may either be ancestral or derive from hybridization, and the accuracy of analytic methods used thus far to derive convincing evidence for the occurrence of present day hybridization is largely debated. Results: Here we propose the applic...
Genetic recolonization of mangrove: Genetic diversity still increasing in the M...
Arnaud-Haond, S.; Duarte, C. M.; Teixeira, S.; Massa, S. I.; Terrados, J.; Tri, N. H.; Hong, P. N.; Serrão, EsterThe widespread use of Agent Orange (a mixture of phenoxyl herbicides) over Southern Vietnam by US Forces led to the decimation of mangrove forests in the Mekong Delta. Mangrove trees Avicennia alba were sampled across the Mekong Delta; their age was assessed using models based on internode growth and samples were genotyped for 6 microsatellite loci. The evolution of genetic diversity over time elapsed since loc...
Genetic diversity of a clonal angiosperm near its range limit: The case of Cymo...
Alberto, F.; Arnaud-Haond, S.; Duarte, C. M.; Serrão, EsterThe seagrass Cymodocea nodosa forms a unique community in the Canary Islands, where it is classified as an endangered species. Biogeographic theory predicts that clonal species on islands near their distributional limits might show lower proportions of sexual (versus clonal) reproduction, lower genetic diversity, and higher differentiation. We addressed these hypotheses by comparing the genetic structure of C. ...
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