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Christophe Destombe - One of the best experts on this subject based on the ideXlab platform.
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molecular evidence for the coexistence of two Sibling Species in pylaiella littoralis ectocarpales phaeophyceae along the brittany coast
Journal of Phycology, 2015Co-Authors: Alexandre Geoffroy, Stephane Mauger, Aurelien De Jode, Line Le Gall, Christophe DestombeAbstract:The great phenotypic variability and the lack of diagnostic characters in the genus Pylaiella render the systematic study of this genus problematic. In this study, we investigated the diversity of Pylaiella littoralis along the Brittany (France) coast using a DNA barcoding multilocus approach with mitochondrial (cox1, nad1, and atp9) and chloroplastic (rbcL and atpB) markers associated with a population genetics approach using 10 microsatellite markers. In addition, spatio-temporal sampling was conducted along the Brittany coast. We sampled 140 individuals from four sites located between Saint-Malo and Concarneau (380 km) from April to October. Mitochondrial sequence data revealed the occurrence of two Sibling Species, with a minimum of 2.4% divergence between them. Microsatellite genotypic data congruently revealed two well-supported clusters matching the two mitochondrial clades of Pylaiella. Although gene flow is limited between Species, occurrence of genetic admixtures in some populations suggested that reproductive isolation is not complete. Our study highlighted the complementarity of barcoding and population genetics approaches to shed light on the evolutionary processes that lead to speciation.
Nicole B. Lopanik - One of the best experts on this subject based on the ideXlab platform.
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latitudinal variation of a defensive symbiosis in the bugula neritina bryozoa Sibling Species complex
PLOS ONE, 2014Co-Authors: Jonathan Linneman, Grace Limfong, Darcy Paulus, Nicole B. LopanikAbstract:Mutualistic relationships are beneficial for both partners and are often studied within a single environment. However, when the range of the partners is large, geographical differences in selective pressure may shift the relationship outcome from positive to negative. The marine bryozoan Bugula neritina is a colonial invertebrate common in temperate waters worldwide. It is the source of bioactive polyketide metabolites, the bryostatins. Evidence suggests that an uncultured vertically transmitted symbiont, “Candidatus Endobugula sertula”, hosted by B. neritina produces the bryostatins, which protect the vulnerable larvae from predation. Studies of B. neritina along the North American Atlantic coast revealed a complex of two morphologically similar Sibling Species separated by an apparent biogeographic barrier: the Type S Sibling Species was found below Cape Hatteras, North Carolina, while Type N was found above. Interestingly, the Type N colonies lack “Ca. Endobugula sertula” and, subsequently, defensive bryostatins; their documented northern distribution was consistent with traditional biogeographical paradigms of latitudinal variation in predation pressure. Upon further sampling of B. neritina populations, we found that both host types occur in wider distribution, with Type N colonies living south of Cape Hatteras, and Type S to the north. Distribution of the symbiont, however, was not restricted to Type S hosts. Genetic and microscopic evidence demonstrates the presence of the symbiont in some Type N colonies, and larvae from these colonies are endowed with defensive bryostatins and contain “Ca. Endobugula sertula”. Molecular analysis of the symbiont from Type N colonies suggests an evolutionarily recent acquisition, which is remarkable for a symbiont thought to be transmitted only vertically. Furthermore, most Type S colonies found at higher latitudes lack the symbiont, suggesting that this host-symbiont relationship is more flexible than previously thought. Our data suggest that the symbiont, but not the host, is restricted by biogeographical boundaries.
Paul E Simonsen - One of the best experts on this subject based on the ideXlab platform.
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Sibling Species of the anopheles funestus group and their infection with malaria and lymphatic filarial parasites in archived and newly collected specimens from northeastern tanzania
Malaria Journal, 2015Co-Authors: Yahya A. Derua, Stephen M Magesa, William Kisinza, Michael Alifrangis, Paul E SimonsenAbstract:Background Studies on the East African coast have shown a recent dramatic decline in malaria vector density and change in composition of Sibling Species of the Anopheles gambiae complex, paralleled by a major decline in malaria incidence. In order to better understand the ongoing changes in vector-parasite dynamics in the area, and to allow for appropriate adjustment of control activities, the present study examined the composition, and malaria and lymphatic filarial infection, of Sibling Species of the Anopheles funestus group. Similar to the An. gambiae complex, the An. funestus group contains important vectors of both malaria and lymphatic filariasis.
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Sibling Species of the anopheles funestus group and their infection with malaria and lymphatic filarial parasites in archived and newly collected specimens from northeastern tanzania
Malaria Journal, 2015Co-Authors: Yahya A. Derua, Stephen M Magesa, William Kisinza, Michael Alifrangis, Paul E SimonsenAbstract:Background Studies on the East African coast have shown a recent dramatic decline in malaria vector density and change in composition of Sibling Species of the Anopheles gambiae complex, paralleled by a major decline in malaria incidence. In order to better understand the ongoing changes in vector-parasite dynamics in the area, and to allow for appropriate adjustment of control activities, the present study examined the composition, and malaria and lymphatic filarial infection, of Sibling Species of the Anopheles funestus group. Similar to the An. gambiae complex, the An. funestus group contains important vectors of both malaria and lymphatic filariasis.
Stephen M Magesa - One of the best experts on this subject based on the ideXlab platform.
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Sibling Species of the anopheles funestus group and their infection with malaria and lymphatic filarial parasites in archived and newly collected specimens from northeastern tanzania
Malaria Journal, 2015Co-Authors: Yahya A. Derua, Stephen M Magesa, William Kisinza, Michael Alifrangis, Paul E SimonsenAbstract:Background Studies on the East African coast have shown a recent dramatic decline in malaria vector density and change in composition of Sibling Species of the Anopheles gambiae complex, paralleled by a major decline in malaria incidence. In order to better understand the ongoing changes in vector-parasite dynamics in the area, and to allow for appropriate adjustment of control activities, the present study examined the composition, and malaria and lymphatic filarial infection, of Sibling Species of the Anopheles funestus group. Similar to the An. gambiae complex, the An. funestus group contains important vectors of both malaria and lymphatic filariasis.
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Sibling Species of the anopheles funestus group and their infection with malaria and lymphatic filarial parasites in archived and newly collected specimens from northeastern tanzania
Malaria Journal, 2015Co-Authors: Yahya A. Derua, Stephen M Magesa, William Kisinza, Michael Alifrangis, Paul E SimonsenAbstract:Background Studies on the East African coast have shown a recent dramatic decline in malaria vector density and change in composition of Sibling Species of the Anopheles gambiae complex, paralleled by a major decline in malaria incidence. In order to better understand the ongoing changes in vector-parasite dynamics in the area, and to allow for appropriate adjustment of control activities, the present study examined the composition, and malaria and lymphatic filarial infection, of Sibling Species of the Anopheles funestus group. Similar to the An. gambiae complex, the An. funestus group contains important vectors of both malaria and lymphatic filariasis.
Alexandre Geoffroy - One of the best experts on this subject based on the ideXlab platform.
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molecular evidence for the coexistence of two Sibling Species in pylaiella littoralis ectocarpales phaeophyceae along the brittany coast
Journal of Phycology, 2015Co-Authors: Alexandre Geoffroy, Stephane Mauger, Aurelien De Jode, Line Le Gall, Christophe DestombeAbstract:The great phenotypic variability and the lack of diagnostic characters in the genus Pylaiella render the systematic study of this genus problematic. In this study, we investigated the diversity of Pylaiella littoralis along the Brittany (France) coast using a DNA barcoding multilocus approach with mitochondrial (cox1, nad1, and atp9) and chloroplastic (rbcL and atpB) markers associated with a population genetics approach using 10 microsatellite markers. In addition, spatio-temporal sampling was conducted along the Brittany coast. We sampled 140 individuals from four sites located between Saint-Malo and Concarneau (380 km) from April to October. Mitochondrial sequence data revealed the occurrence of two Sibling Species, with a minimum of 2.4% divergence between them. Microsatellite genotypic data congruently revealed two well-supported clusters matching the two mitochondrial clades of Pylaiella. Although gene flow is limited between Species, occurrence of genetic admixtures in some populations suggested that reproductive isolation is not complete. Our study highlighted the complementarity of barcoding and population genetics approaches to shed light on the evolutionary processes that lead to speciation.
