The Experts below are selected from a list of 495 Experts worldwide ranked by ideXlab platform
Tobias S Kaiser - One of the best experts on this subject based on the ideXlab platform.
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timing the tides genetic control of diurnal and Lunar emergence times is correlated in the marine midge clunio marinus
BMC Genetics, 2011Co-Authors: Dietrich Neumann, Tobias S Kaiser, David G HeckelAbstract:The intertidal zone of seacoasts, being affected by the superimposed tidal, diurnal and Lunar cycles, is temporally the most complex environment on earth. Many marine organisms exhibit Lunar Rhythms in reproductive behaviour and some show experimental evidence of endogenous control by a circaLunar clock, the molecular and genetic basis of which is unexplored. We examined the genetic control of Lunar and diurnal rhythmicity in the marine midge Clunio marinus (Chironomidae, Diptera), a species for which the correct timing of adult emergence is critical in natural populations. We crossed two strains of Clunio marinus that differ in the timing of the diurnal and Lunar Rhythms of emergence. The phenotype distribution of the segregating backcross progeny indicates polygenic control of the Lunar emergence rhythm. Diurnal timing of emergence is also under genetic control, and is influenced by two unlinked genes with major effects. Furthermore, the Lunar and diurnal timing of emergence is correlated in the backcross generation. We show that both the Lunar emergence time and its correlation to the diurnal emergence time are adaptive for the species in its natural environment. The correlation implies that the unlinked genes affecting Lunar timing and the two unlinked genes affecting diurnal timing could be the same, providing an unexpectedly close interaction of the two clocks. Alternatively, the genes could be genetically linked in a two-by-two fashion, suggesting that evolution has shaped the genetic architecture to stabilize adaptive combinations of Lunar and diurnal emergence times by tightening linkage. Our results, the first on genetic control of Lunar Rhythms, offer a new perspective to explore their molecular clockwork.
David G Heckel - One of the best experts on this subject based on the ideXlab platform.
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timing the tides genetic control of diurnal and Lunar emergence times is correlated in the marine midge clunio marinus
BMC Genetics, 2011Co-Authors: Dietrich Neumann, Tobias S Kaiser, David G HeckelAbstract:The intertidal zone of seacoasts, being affected by the superimposed tidal, diurnal and Lunar cycles, is temporally the most complex environment on earth. Many marine organisms exhibit Lunar Rhythms in reproductive behaviour and some show experimental evidence of endogenous control by a circaLunar clock, the molecular and genetic basis of which is unexplored. We examined the genetic control of Lunar and diurnal rhythmicity in the marine midge Clunio marinus (Chironomidae, Diptera), a species for which the correct timing of adult emergence is critical in natural populations. We crossed two strains of Clunio marinus that differ in the timing of the diurnal and Lunar Rhythms of emergence. The phenotype distribution of the segregating backcross progeny indicates polygenic control of the Lunar emergence rhythm. Diurnal timing of emergence is also under genetic control, and is influenced by two unlinked genes with major effects. Furthermore, the Lunar and diurnal timing of emergence is correlated in the backcross generation. We show that both the Lunar emergence time and its correlation to the diurnal emergence time are adaptive for the species in its natural environment. The correlation implies that the unlinked genes affecting Lunar timing and the two unlinked genes affecting diurnal timing could be the same, providing an unexpectedly close interaction of the two clocks. Alternatively, the genes could be genetically linked in a two-by-two fashion, suggesting that evolution has shaped the genetic architecture to stabilize adaptive combinations of Lunar and diurnal emergence times by tightening linkage. Our results, the first on genetic control of Lunar Rhythms, offer a new perspective to explore their molecular clockwork.
Dietrich Neumann - One of the best experts on this subject based on the ideXlab platform.
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timing in tidal semiLunar and Lunar Rhythms
2014Co-Authors: Dietrich NeumannAbstract:Tidal, semiLunar, and Lunar Rhythms are particularly pronounced in intertidal organisms, which are affected by strong fluctuations of environmental factors with the tides. For a number of species it has been shown that their tidal, semiLunar, or Lunar Rhythms in behavior and reproduction are not a direct response to the tides, but reflect the action of endogenous biological clocks. This chapter reviews current knowledge on the properties and mechanisms of circatidal and circa(semi)Lunar clocks as shown by laboratory experiments and highlights major open questions for future research.
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timing the tides genetic control of diurnal and Lunar emergence times is correlated in the marine midge clunio marinus
BMC Genetics, 2011Co-Authors: Dietrich Neumann, Tobias S Kaiser, David G HeckelAbstract:The intertidal zone of seacoasts, being affected by the superimposed tidal, diurnal and Lunar cycles, is temporally the most complex environment on earth. Many marine organisms exhibit Lunar Rhythms in reproductive behaviour and some show experimental evidence of endogenous control by a circaLunar clock, the molecular and genetic basis of which is unexplored. We examined the genetic control of Lunar and diurnal rhythmicity in the marine midge Clunio marinus (Chironomidae, Diptera), a species for which the correct timing of adult emergence is critical in natural populations. We crossed two strains of Clunio marinus that differ in the timing of the diurnal and Lunar Rhythms of emergence. The phenotype distribution of the segregating backcross progeny indicates polygenic control of the Lunar emergence rhythm. Diurnal timing of emergence is also under genetic control, and is influenced by two unlinked genes with major effects. Furthermore, the Lunar and diurnal timing of emergence is correlated in the backcross generation. We show that both the Lunar emergence time and its correlation to the diurnal emergence time are adaptive for the species in its natural environment. The correlation implies that the unlinked genes affecting Lunar timing and the two unlinked genes affecting diurnal timing could be the same, providing an unexpectedly close interaction of the two clocks. Alternatively, the genes could be genetically linked in a two-by-two fashion, suggesting that evolution has shaped the genetic architecture to stabilize adaptive combinations of Lunar and diurnal emergence times by tightening linkage. Our results, the first on genetic control of Lunar Rhythms, offer a new perspective to explore their molecular clockwork.
Damien Tran - One of the best experts on this subject based on the ideXlab platform.
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how annual course of photoperiod shapes seasonal behavior of diploid and triploid oysters crassostrea gigas
PLOS ONE, 2017Co-Authors: Laura Payton, Mohamedou Sow, Jeancharles Massabuau, Pierre Ciret, Damien TranAbstract:In this work, we study if ploidy (i.e. number of copies of chromosomes) in the oyster Crassostrea gigas may introduce differences in behavior and in its synchronization by the annual photoperiod. To answer to the question about the effect of the seasonal course of the photoperiod on the behavior of C. gigas according to its ploidy, we quantified valve activity by HFNI valvometry in situ for 1 year in both diploid and triploid oysters. Chronobiological analyses of daily, tidal and Lunar Rhythms were performed according the annual change of the photoperiod. In parallel, growth and gametogenesis status were measured and spawning events were detected by valvometry. The results showed that triploids had reduced gametogenesis, without spawning events, and approximately three times more growth than diploids. These differences in physiological efforts could explain the result that photoperiod (daylength and/or direction of daylength) differentially drives and modulates seasonal behavior of diploid and triploid oysters. Most differences were observed during long days (spring and summer), where triploids showed longer valve opening duration but lower opening amplitude, stronger daily rhythm and weaker tidal rhythm. During this period, diploids did major gametogenesis and spawning whereas triploids did maximal growth. Differences were also observed in terms of moonlight rhythmicity and neap-spring tidal cycle rhythmicity. We suggest that the seasonal change of photoperiod differentially synchronizes oyster behavior and biological Rhythms according to physiological needs based on ploidy.
Jeanfrancois Hamel - One of the best experts on this subject based on the ideXlab platform.
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Lunar Rhythms in the deep sea evidence from the reproductive periodicity of several marine invertebrates
Journal of Biological Rhythms, 2011Co-Authors: Annie Mercier, Zhao Sun, Sandrine Baillon, Jeanfrancois HamelAbstract:While Lunar Rhythms are commonly documented in plants and animals living in terrestrial and shallow-water environments, deep-sea organisms have essentially been overlooked in that respect. This report describes evidence of Lunar periodicity in the reproduction of 6 deep-sea species belonging to 2 phyla. Occurrences of gamete release in free spawners and larval release in brooders exhibited significant peaks around the new and full moons, respectively. The exact nature of this Lunar period (endogenous or exogenous rhythm) and its adaptive significance in the deep sea remain elusive. Current knowledge suggests that proxies of moon phases at depth may include fluxes in particulate matter deposition, cyclic currents, and moonlight for species living in the disphotic zone.
