19 documents found, page 1 of 2
Major shifts at the range edge of marine forests: the combined effects of clima...
Assis, J.; Berecibar, E.; Claro, B.; Alberto, F.; Reed, D.; Raimondi, P.; A, SerrãoGlobal climate change is likely to constrain low latitude range edges across many taxa and habitats. Such is the case for NE Atlantic marine macroalgal forests, important ecosystems whose main structuring species is the annual kelp Saccorhiza polyschides. We coupled ecological niche modelling with simulations of potential dispersal and delayed development stages to infer the major forces shaping range edges and...
Extending the life history of a clonal aquatic plant: dispersal potential of se...
Berković, Buga; Cabaço, Susana; Barrio, Juan M.; Santos, Rui; Serrão, Ester; Alberto, F.The dispersal potential of sexual and asexual propagules of Zostera noltii was experimentally quantified in still water and under different currents in microcosm and mesocosm facilities. We estimated sinking rates of seeds and changes over time in shoot buoyancy, shoot viability, fragment breakage, shoot growth rate and spathe release rate of floating fragments. The fast sinking rates of detached Z. noltii seed...
Looking into the black box: simulating the role of self-fertilization and morta...
Johansson, M. L.; Raimondi, P. T.; Reed, D. C.; Coelho, N. C.; Serrão, Ester; Alberto, F.Patterns of spatial genetic structure (SGS), typically estimated by genotyping adults, integrate migration over multiple generations and measure the effective gene flow of populations. SGS results can be compared with direct ecological studies of dispersal or mating system to gain additional insights. When mismatches occur, simulations can be used to illuminate the causes of these mismatches. Here, we report a ...
High and distinct range-edge genetic diversity despite local bottlenecks
Assis, J.; Castilho Coelho, N.; Alberto, F.; Valero, Myriam; Raimondi, P. T.; Reed, D. C.; Serrão, EsterThe genetic consequences of living on the edge of distributional ranges have been the subject of a largely unresolved debate. Populations occurring along persistent low latitude ranges (rear-edge) are expected to retain high and unique genetic diversity. In contrast, currently less favourable environmental conditions limiting population size at such range-edges may have caused genetic erosion that prevails over...
Isolation by oceanographic distance explains genetic structure for Macrocystis ...
Alberto, F.; Raimondi, P. T.; Reed, D. C.; Watson, J. R.; Siegel, D. A.; Mitarai, S.; Coelho, N. C.; Serrão, EsterOcean currents are expected to be the predominant environmental factor influencing the dispersal of planktonic larvae or spores; yet, their characterization as predictors of marine connectivity has been hindered by a lack of understanding of how best to use oceanographic data. We used a high-resolution oceanographic model output and Lagrangian particle simulations to derive oceanographic distances (hereafter ca...
Fast sporophyte replacement after removal suggests banks of latent microscopic ...
Barradas, Ana; Alberto, F.; Engelen, Aschwin; Serrão, EsterThis study investigated the effects of a physical disturbance consisting of the removal of adult kelps (Laminaria ochroleuca Bachelot de la Pylaie)and their corresponding understorey turf assemblage in tide pools in northern Portugal.
Microsatellite markers for the giant kelp macrocystis pyrifera
Alberto, F.; Whitmer, A.; Coelho, N. C.; Zippay, M.; E, Varela-Álvarez; Raimondi, P. T.; Reed, D. C.; Serrão, EsterWe report the isolation and characterization of 16 microsatellite loci to study the population genetics of the giant kelp, Macrocystis pyrifera. Markers were obtained by screening a genomic library enriched for microsatellite motifs. Of the 37 primer pairs defined, 16 amplified clean polymorphic microsatellites and are described. These loci identified a number of alleles ranging from three to forty (mean = 16.5...
Findkelp, a GIS-based community participation project to assess portuguese kelp...
Assis, J.; Tavares, D.; Tavares, J.; Cunha, A. H.; Alberto, F.; Serrão, EsterIn almost any Atlantic coastal area of Europe where there is a suitable substratum and adequate water quality, one or more species of kelp may be found. Their high productivity and complex biological structure make kelps especially important members of their communities, particularly when present in dense stands known as “kelp forests”. Currently, these species are subject to important novel constraints of phys...
Standardizing methods to address clonality in population studies (Molecular Eco...
ARNAUD-HAOND, Sophie; Duarte, M.; Alberto, F.; Serrão, EsterAlthough clonal species are dominant in many habitats, from unicellular organisms to plants and animals, ecological and particularly evolutionary studies on clonal species have been strongly limited by the difficulty in assessing the number, size and longevity of genetic individuals within a population. The development of molecular markers has allowed progress in this area, and although allozymes remain of limi...
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...