1. When mothers anticipate: Effects of the prediapause stage on embryo development time and of maternal photoperiod on eggs of a temperate and a tropical strains of Aedes albopictus (Diptera: Culicidae)
- Author
-
Guillaume Lacour, Nicolas Cadilhac, Christophe Lagneau, Sébastien Boyer, Thierry Hance, Florian Vernichon, Université Catholique de Louvain = Catholic University of Louvain (UCL), Entente Interdépartementale pour la démoustication du littoral méditerranéen (EID), Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])
- Subjects
0106 biological sciences ,Aedes albopictus ,Embryo, Nonmammalian ,Physiology ,Photoperiod ,Zoology ,Embryonic Development ,Phenotypic plasticity ,Diapause ,Diapause, Insect ,Embryo development ,01 natural sciences ,03 medical and health sciences ,Aedes ,Animals ,030304 developmental biology ,Ovum ,photoperiodism ,0303 health sciences ,Larva ,biology ,Ecology ,Embryogenesis ,Maternal effect ,Embryo ,biology.organism_classification ,[SDV.BA.ZI]Life Sciences [q-bio]/Animal biology/Invertebrate Zoology ,010602 entomology ,[SDV.BDD.EO]Life Sciences [q-bio]/Development Biology/Embryology and Organogenesis ,Insect Science ,embryonic structures ,Female ,Day length - Abstract
International audience; Background: The diapause of Aedes albopictus is maternally induced by photoperiod and initiates at the pharate larvae stage in eggs. This pre-diapause results in enhanced survival eggs during the winter. This study aims to disentangle the effects of photoperiod and diapause on embryonic developmental time and egg size in A. albopictus. A temperate strain capable to perform diapause and a tropical strain unable of diapause were reared at 21°C with long-(LD) and short-day (SD) lengths. Four distinct traits were studied on embryos and eggs were measured at the end of embryogenesis.Results: The chronologies of embryo development for both strains were influenced by maternal photoperiod, especially in the temperate strain in which the development of SD eggs took longer than LD eggs. The delay increased gradually in the temperate strain, and reached up to 38 h at the end of embryogenesis. The kinetics of embryogenesis differed among the temperate and the tropical strains, each one of the 4 studied traits showing differences. For example the serosal cuticle was secreted precociously in the tropical strain. Egg width and volume are influenced by the maternal photoperiod and the strain  photoperiod interaction. For both strains, larger eggs were laid by female reared under SD when compared to LD.Conclusions: The influence of several maternal effects was demonstrated in this study. The diapause process modifies greatly the length of embryogenesis in the temperate strain, whereas the maternal photoperiod has a direct influence on egg size and embryogenesis regardless of the strain considered. These findings provide useful data on chronology of embryonic development for integrative biology studies of egg pre-diapause stages.
- Full Text
- View/download PDF