The Experts below are selected from a list of 17001 Experts worldwide ranked by ideXlab platform
Alexandra Anhthu Weber - One of the best experts on this subject based on the ideXlab platform.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 \textless F-ST \textless 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 \textless F-ST \textless 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F-ST \textless 0.001) and strong structure in the brooders (global F-ST = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 < F(ST) < 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 < F(ST) < 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F(ST) < 0.001) and strong structure in the brooders (global F(ST) = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
Anne Chenuil - One of the best experts on this subject based on the ideXlab platform.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 \textless F-ST \textless 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 \textless F-ST \textless 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F-ST \textless 0.001) and strong structure in the brooders (global F-ST = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 < F(ST) < 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 < F(ST) < 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F(ST) < 0.001) and strong structure in the brooders (global F(ST) = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
Sophie Valiere - One of the best experts on this subject based on the ideXlab platform.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 \textless F-ST \textless 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 \textless F-ST \textless 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F-ST \textless 0.001) and strong structure in the brooders (global F-ST = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 < F(ST) < 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 < F(ST) < 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F(ST) < 0.001) and strong structure in the brooders (global F(ST) = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
Bastien Mérigot - One of the best experts on this subject based on the ideXlab platform.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 \textless F-ST \textless 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 \textless F-ST \textless 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F-ST \textless 0.001) and strong structure in the brooders (global F-ST = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
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influence of the larval phase on connectivity strong differences in the genetic structure of brooders and Broadcasters in the ophioderma longicauda species complex
Molecular Ecology, 2015Co-Authors: Alexandra Anhthu Weber, Sophie Valiere, Bastien Mérigot, Anne ChenuilAbstract:Closely related species with divergent life history traits are excellent models to infer the role of such traits in genetic diversity and connectivity. Ophioderma longicauda is a brittle star species complex composed of different genetic clusters, including brooders and Broadcasters. These species diverged very recently and some of them are sympatric and ecologically syntopic, making them particularly suitable to study the consequences of their trait differences. At the scale of the geographic distribution of the Broadcasters (Mediterranean Sea and northeastern Atlantic), we sequenced the mitochondrial marker COI and genotyped an intron (i51) for 788 individuals. In addition, we sequenced 10 nuclear loci newly developed from transcriptome sequences, for six sympatric populations of brooders and Broadcasters from Greece. At the large scale, we found a high genetic structure within the brooders (COI: 0.07 < F(ST) < 0.65) and no polymorphism at the nuclear locus i51. In contrast, the Broadcasters displayed lower genetic structure (0 < F(ST) < 0.14) and were polymorphic at locus i51. At the regional scale, the multilocus analysis confirmed the contrasting genetic structure between species, with no structure in the Broadcasters (global F(ST) < 0.001) and strong structure in the brooders (global F(ST) = 0.49), and revealed a higher genetic diversity in Broadcasters. Our study showed that the lecithotrophic larval stage allows on average a 50-fold increase in migration rates, a 280-fold increase in effective size and a threefold to fourfold increase in genetic diversity. Our work, investigating complementary genetic markers on sympatric and syntopic taxa, highlights the strong impact of the larval phase on connectivity and genetic diversity.
Antonio Ciaglia - One of the best experts on this subject based on the ideXlab platform.
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public servant or censor the south african broadcasting corporation in the era of political television advertising
Journal of Agricultural Education, 2015Co-Authors: Sarah Chiumbu, Antonio CiagliaAbstract:Political television advertising is becoming an important feature of democratic elections and essential to election campaign strategies. In this article we take a close look at the role the South African Broadcasting Corporation (SABC) is playing in the new era of political television advertising ushered in in 2009. We focus our analysis on the banning by the SABC of election advertisements by two major opposition political parties before the 2014 elections. The country's regulator, the Independent Communications Authority of South Africa (Icasa) upheld the decision of the SABC when the two parties filed complaints. The banning of the advertisements and Icasa's decision are assessed on two important principles for public broadcasting - editorial independence and public accountability. We argue in this article that the action by the public broadcaster undermines freedom of expression and the credibility of both the SABC and Icasa, especially when contextualised within other controversial editorial decisions taken by the broadcaster over the years. Further, we argue that laws governing political advertising in South Africa are constitutionally problematic and contain contradictions in how they should be applied and implemented by both Broadcasters and Icasa. We conclude by arguing for a review of these laws.
