The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Virginie Courtierorgogozo - One of the best experts on this subject based on the ideXlab platform.
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a Morphological Trait involved in reproductive isolation between drosophila sister species is sensitive to temperature
Ecology and Evolution, 2021Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and Drosophila yakuba. We designed a semi-automatic measurement machine learning pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. We found that male genitalia structures involved in reproductive isolation can be relatively variable within one species and can resemble the shape of closely related species' genitalia through plasticity to temperature. Our results suggest that reproductive isolation mechanisms can be dependent on the environmental context.
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a Morphological Trait involved in reproductive isolation between drosophila sister species is sensitive to temperature
bioRxiv, 2021Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and D. yakuba. We designed a semi-automatic measurement pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. Our results suggest that speciation of D. santomea and D. yakuba was associated with a change in genitalia plasticity.
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temperature change has the same effect as genetic variation on a Morphological Trait involved in reproductive isolation between drosophila sister species
bioRxiv, 2020Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Abstract Phenotypic plasticity, the capacity of one genotype to generate distinct phenotypes in different environments, is usually thought to facilitate species divergence by opening novel ecological niches to plastic individuals. Here we reveal a case of speciation where this “plasticity first” scenario might not hold. Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Under the lock-and-key hypothesis, rapid Morphological evolution is associated with a high match between male and female genitalia of the same species and a low match between male and females of closely related species. Previous studies have suggested plasticity of genitalia to be a proof against the lock-and-key hypothesis since the environmentally triggered phenotypic change could modify the “key”. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and D. yakuba. We designed a semi-automatic measurement pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that ventral branches are not plastic in D. yakuba but that in D. santomea temperature change phenocopies interspecific genetic variation between both species for ventral branches shape. Our results suggest that speciation of D. santomea and D. yakuba was associated with a gain of plasticity and that genitalia plasticity can be compatible with the lock-and-key hypothesis.
Alexandre E Peluffo - One of the best experts on this subject based on the ideXlab platform.
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a Morphological Trait involved in reproductive isolation between drosophila sister species is sensitive to temperature
Ecology and Evolution, 2021Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and Drosophila yakuba. We designed a semi-automatic measurement machine learning pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. We found that male genitalia structures involved in reproductive isolation can be relatively variable within one species and can resemble the shape of closely related species' genitalia through plasticity to temperature. Our results suggest that reproductive isolation mechanisms can be dependent on the environmental context.
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a Morphological Trait involved in reproductive isolation between drosophila sister species is sensitive to temperature
bioRxiv, 2021Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and D. yakuba. We designed a semi-automatic measurement pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. Our results suggest that speciation of D. santomea and D. yakuba was associated with a change in genitalia plasticity.
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temperature change has the same effect as genetic variation on a Morphological Trait involved in reproductive isolation between drosophila sister species
bioRxiv, 2020Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Abstract Phenotypic plasticity, the capacity of one genotype to generate distinct phenotypes in different environments, is usually thought to facilitate species divergence by opening novel ecological niches to plastic individuals. Here we reveal a case of speciation where this “plasticity first” scenario might not hold. Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Under the lock-and-key hypothesis, rapid Morphological evolution is associated with a high match between male and female genitalia of the same species and a low match between male and females of closely related species. Previous studies have suggested plasticity of genitalia to be a proof against the lock-and-key hypothesis since the environmentally triggered phenotypic change could modify the “key”. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and D. yakuba. We designed a semi-automatic measurement pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that ventral branches are not plastic in D. yakuba but that in D. santomea temperature change phenocopies interspecific genetic variation between both species for ventral branches shape. Our results suggest that speciation of D. santomea and D. yakuba was associated with a gain of plasticity and that genitalia plasticity can be compatible with the lock-and-key hypothesis.
Jean R David - One of the best experts on this subject based on the ideXlab platform.
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a Morphological Trait involved in reproductive isolation between drosophila sister species is sensitive to temperature
Ecology and Evolution, 2021Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and Drosophila yakuba. We designed a semi-automatic measurement machine learning pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. We found that male genitalia structures involved in reproductive isolation can be relatively variable within one species and can resemble the shape of closely related species' genitalia through plasticity to temperature. Our results suggest that reproductive isolation mechanisms can be dependent on the environmental context.
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a Morphological Trait involved in reproductive isolation between drosophila sister species is sensitive to temperature
bioRxiv, 2021Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and D. yakuba. We designed a semi-automatic measurement pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that temperature does not affect ventral branches in D. yakuba but that in D. santomea ventral branches tend to morph into a D. yakuba-like shape at lower temperature. Our results suggest that speciation of D. santomea and D. yakuba was associated with a change in genitalia plasticity.
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temperature change has the same effect as genetic variation on a Morphological Trait involved in reproductive isolation between drosophila sister species
bioRxiv, 2020Co-Authors: Alexandre E Peluffo, Mehdi Hamdani, Alejandra Vargasvalderrama, Jean R David, Francois Mallard, Francois Graner, Virginie CourtierorgogozoAbstract:Abstract Phenotypic plasticity, the capacity of one genotype to generate distinct phenotypes in different environments, is usually thought to facilitate species divergence by opening novel ecological niches to plastic individuals. Here we reveal a case of speciation where this “plasticity first” scenario might not hold. Male genitalia are usually extremely divergent between closely related species, but relatively constant within one species. Under the lock-and-key hypothesis, rapid Morphological evolution is associated with a high match between male and female genitalia of the same species and a low match between male and females of closely related species. Previous studies have suggested plasticity of genitalia to be a proof against the lock-and-key hypothesis since the environmentally triggered phenotypic change could modify the “key”. Here we examine the effect of temperature on the shape of the ventral branches, a male genital structure involved in reproductive isolation, in the sister species Drosophila santomea and D. yakuba. We designed a semi-automatic measurement pipeline that can reliably identify curvatures and landmarks based on manually digitized contours of the ventral branches. With this method, we observed that ventral branches are not plastic in D. yakuba but that in D. santomea temperature change phenocopies interspecific genetic variation between both species for ventral branches shape. Our results suggest that speciation of D. santomea and D. yakuba was associated with a gain of plasticity and that genitalia plasticity can be compatible with the lock-and-key hypothesis.
Oyvind Overli - One of the best experts on this subject based on the ideXlab platform.
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melanin based skin spots reflect stress responsiveness in salmonid fish
Hormones and Behavior, 2009Co-Authors: Silje Kittilsen, Joachim Schjolden, I Beitnesjohansen, Jenny C Shaw, T G Pottinger, Christina Sorensen, Bjarne O Braastad, Morten Bakken, Oyvind OverliAbstract:Within animal populations, genetic, epigenetic and environmental factors interact to shape individual neuroendocrine and behavioural profiles, conferring variable vulnerability to stress and disease. It remains debated how alternative behavioural syndromes and stress coping styles evolve and are maintained by natural selection. Here we show that individual variation in stress responsiveness is reflected in the visual appearance of two species of teleost fish; rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar). Salmon and trout skin vary from nearly immaculate to densely spotted, with black spots formed by eumelanin-producing chromatophores. In rainbow trout, selection for divergent hypothalamus-pituitary-interrenal responsiveness has led to a change in dermal pigmentation patterns, with low cortisol-responsive fish being consistently more spotted. In an aquaculture population of Atlantic salmon individuals with more spots showed a reduced physiological and behavioural response to stress. Taken together, these data demonstrate a heritable behavioural-physiological and Morphological Trait correlation that may be specific to alternative coping styles. This observation may illuminate the evolution of contrasting coping styles and behavioural syndromes, as occurrence of phenotypes in different environments and their response to selective pressures can be precisely and easily recorded.
Jenny C Shaw - One of the best experts on this subject based on the ideXlab platform.
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melanin based skin spots reflect stress responsiveness in salmonid fish
Hormones and Behavior, 2009Co-Authors: Silje Kittilsen, Joachim Schjolden, I Beitnesjohansen, Jenny C Shaw, T G Pottinger, Christina Sorensen, Bjarne O Braastad, Morten Bakken, Oyvind OverliAbstract:Within animal populations, genetic, epigenetic and environmental factors interact to shape individual neuroendocrine and behavioural profiles, conferring variable vulnerability to stress and disease. It remains debated how alternative behavioural syndromes and stress coping styles evolve and are maintained by natural selection. Here we show that individual variation in stress responsiveness is reflected in the visual appearance of two species of teleost fish; rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar). Salmon and trout skin vary from nearly immaculate to densely spotted, with black spots formed by eumelanin-producing chromatophores. In rainbow trout, selection for divergent hypothalamus-pituitary-interrenal responsiveness has led to a change in dermal pigmentation patterns, with low cortisol-responsive fish being consistently more spotted. In an aquaculture population of Atlantic salmon individuals with more spots showed a reduced physiological and behavioural response to stress. Taken together, these data demonstrate a heritable behavioural-physiological and Morphological Trait correlation that may be specific to alternative coping styles. This observation may illuminate the evolution of contrasting coping styles and behavioural syndromes, as occurrence of phenotypes in different environments and their response to selective pressures can be precisely and easily recorded.