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Transgenerational phenotypic plasticity of diapause induction and related fitness cost in a commercial strain of the parasitoid Aphidius ervi Haliday

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Insect Science 2021年第3期28卷 780-792页

作者： Muhammad Mubashir Saeed Kevin Tougeron Abu Bakar Muhammad Raza Muhammad Afzal Anjum Aqueel Guillaume Jean Le Goff Frangois Renoz Jennifer Pirotte Thierry Hance Department of Entomology University College of AgricultureUniversity of SargodhaSargodhaPakistan Earth and Life Institute Biodiversity Research CentreUniversite catholique de LouvainLouvain-la-Neuve1348Belgium

Diapause is an adaptation that insects have evolved to synchronize their life cycle with that of seasonal climatic changes and resources ***,cues for its induction are not always clear and,in some cases,a maternal effect may be *** the population level,just a part of the individuals may exhibit diapause with important consequences in terms of winter ***,clear indicators of diapause state are difficult to *** induction was thus investigated in the aphid parasitoid species Aphidius ervi Haliday(Hymenoptera:Braconidae)developing in the aphid Sitobion avenae(Hemiptera:Aphididae)at four crossed photothermal regimes(16℃and 8℃,16:8 h L:D and 8:16 h L:D),and during 2 successive *** analyzed the reliability of changes in mummy color to assess for the diapausing state compared to dissections,and we measured parasitoid morphological and physiological *** observed that the proportion of dark brown mummies increased after one generation under low photothermal regime compared to other *** diapause was recorded at 16℃,16:8 h L:D,while we observed 16.2%and 67.5%diapause incidence at 8℃,8:16 h L:D,at 1st and 2nd generation,*** induction is thus increased by short day-length conditions and low temperatures as well as by maternal *** parasitoid life-history traits(weight,size,fat content,water content,egg-load,and longevity)were affected by the photothermal regime and/or the *** results raise new questions on the environmental thresholds needed to induce diapause and on survival and adaptation potential of commercially available parasitoid strains in different environments.

关键词： dormancy life-history traits mummy color photothermal regimes transgenerational plasticity

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