Consulta: creatorFacets:"Teixeira, Sara"
Registros recuperados: 5
Data/hora: 11/06/2024 12:12:51

Recent population expansion and connectivity in the hydrothermal shrimp Rimicaris exoculata along the Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Teixeira, Sara; Cambon-bonavita, Marie-anne; Serrao, Ester A.; Desbruyeres, Daniel; Arnaud-haond, Sophie.
Aim Deep-sea hydrothermal vents are unstable habitats that are both spatially and temporally fragmented. In vent species, a 'short-term insurance' hypothesis would lead us to expect mostly self-recruitment, limiting the loss of larvae in the deep ocean or water column and increasing genetic differentiation over the time elapsed since colonization. Alternatively, a 'long-term insurance' hypothesis would support the prediction of selection for large-scale dispersal, to ensure long-term persistence in these ephemeral habitats. The main goal of this study was to infer the spatial and temporal distribution of genetic diversity of the shrimp Rimicaris exoculata, which forms high-density local populations on hydrothermal vents along the Mid-Atlantic ridge....
Tipo: Text
Palavras-chave: Bottleneck; Deep-sea biogeography; Dispersal; Genetic diversity; Hydrothermal vents; Marine biogeography; Mid-Atlantic Ridge; Rimicaris exoculata; Spatio-temporal distribution.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00033/14394/12350.pdf

Genetic recolonization of mangrove: genetic diversity still increasing in the Mekong Delta 30 years after Agent Orange
Provedor de dados: 5
Autores: Arnaud-haond, Sophie; Duarte, Carlos M.; Teixeira, Sara; Massa, Sonia Isabel; Terrados, Jorge; Nguyen Hong, Tri; Phan Nguyen, Hong; Serrao, Ester A.
The 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 local extinction was reconstructed and compared with the genetic diversity of an unaffected population from Thailand, The results show that genetic diversity of the A. alba population is still increasing in the Mekong Delta 3 decades after the end of the Vietnam War, but is reaching an asymptotic level that is comparable to the adjacent non-affected...
Tipo: Text
Palavras-chave: Agent Orange; Deforestation; Mangrove; Local extinction; Demographic recovery; Genetic recovery; Recolonization genetics.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6898.pdf

Panmixia in a Fragmented and Unstable Environment: The Hydrothermal Shrimp Rimicaris exoculata Disperses Extensively along the Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Teixeira, Sara; Serrao, Ester A.; Arnaud, Sophie.
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 differentiation was found between individuals from the different geographic origins, supporting a scenario of widespread large-scale dispersal despite the habitat distance and fragmentation. We hypothesize that delayed metamorphosis associated to temperature differences or even active directed migration dependent on physical and/or chemical stimuli could explain...
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00087/19858/17509.pdf

Microsatellite markers developed through pyrosequencing allow clonal discrimination in the invasive alga Caulerpa taxifolia
Provedor de dados: 5
Autores: Arnaud-haond, Sophie; Candeias, Rui; Serrao, Ester A.; Teixeira, Sara.
Polymorphic microsatellites were developed for the invasive green algae Caulerpa taxifolia using next generation DNA sequencing. Results showed a limited rate of microsatellites for the amount of sequences, possibly explaining failure of previous attempts for microsatellite development through classical methods. Eight polymorphic loci were selected that exhibited polymorphism and a null or negligible rate of amplification failure. The number of alleles per locus ranged from two to seven. The reconstruction of Multi Locus Genotypes and the heterozygosity and departure from Hardy-Weinberg equilibrium confirmed the influence of clonal reproduction and showed the usefulness of this set of markers to successfully discriminate clonal lineages and analyze the...
Tipo: Text
Palavras-chave: Caulerpa taxifolia; Algae; Invasion; Mediterranean; Queensland; New South Wales; Seagrass.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00126/23720/21598.pdf

High connectivity across the fragmented chemosynthetic ecosystems of the deep Atlantic Equatorial Belt: efficient dispersal mechanisms or questionable endemism?
Provedor de dados: 5
Autores: Teixeira, Sara; Olu, Karine; Decker, Carole; Cunha, Regina L.; Fuchs, Sandra; Hourdez, Stephane; Serrao, Ester A.; Arnaud-haond, Sophie.
Chemosynthetic ecosystems are distributed worldwide in fragmented habitats harbouring seemingly highly specialized communities. Yet, shared taxa have been reported from highly distant chemosynthetic communities. These habitats are distributed in distinct biogeographical regions, one of these being the so-called Atlantic Equatorial Belt (AEB). Here, we combined genetic data (COI) from several taxa to assess the possible existence of cryptic or synonymous species and to detect the possible occurrence of contemporary gene flow among populations of chemosynthetic species located on both sides of the Atlantic. Several Evolutionary Significant Units (ESUs) of Alvinocarididae shrimp and Vesicomyidae bivalves were found to be shared across seeps of the AEB. Some...
Tipo: Text
Palavras-chave: Atlantic equatorial belt; Chemosynthetic habitats; Deep-sea connectivity; Endemic bivalves; Endemic shrimp; Genetic diversity; Microsatellite markers; Mitochondrial COI gene.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26789/24950.pdf