Genetic variation for parental effects on the propensity to gregarise in <Emphasis Type="Italic">Locusta migratoria</Emphasis> |
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Authors: | Marie-Pierre Chapuis Arnaud Estoup Arnaud Augé-Sabatier Antoine Foucart Michel Lecoq Yannis Michalakis |
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Institution: | 1.Centre de Biologie et de Gestion des Populations,Institut National de la Recherche Agronomique, Campus International de Baillarguet,Montferrier/Lez,France;2.Génétique et Evolution des Maladies Infectieuses,UMR 2724 Centre National de la Recherche Scientifique – Institut de la Recherche et du Développement, Institut de la Recherche et du Développement,Montpellier Cedex 5,France;3.Ecologie et Ma?trise des Populations d'Acridiens,Département BIOS, Centre de coopération internationale en recherche agronomique pour le développement, Campus International de Baillarguet,Montpellier Cedex 5,France |
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Abstract: | Background Environmental parental effects can have important ecological and evolutionary consequences, yet little is known about genetic
variation among populations in the plastic responses of offspring phenotypes to parental environmental conditions. This type
of variation may lead to rapid phenotypic divergence among populations and facilitate speciation. With respect to density-dependent
phenotypic plasticity, locust species (Orthoptera: family Acrididae), exhibit spectacular developmental and behavioural shifts
in response to population density, called phase change. Given the significance of phase change in locust outbreaks and control,
its triggering processes have been widely investigated. Whereas crowding within the lifetime of both offspring and parents
has emerged as a primary causal factor of phase change, less is known about intraspecific genetic variation in the expression
of phase change, and in particular in response to the parental environment. We conducted a laboratory experiment that explicitly
controlled for the environmental effects of parental rearing density. This design enabled us to compare the parental effects
on offspring expression of phase-related traits between two naturally-occurring, genetically distinct populations of Locusta migratoria that differed in their historical patterns of high population density outbreak events. |
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