Age and size thresholds for pupation and developmental polymorphism in the browntail moth, Euproctis chrysorrhoea under conditions that either emulate diapause or prevent it

Frago Enric, Selfa Jesús, Pujade-Villar Juli, Guara Miguel, Bauce Eric. 2009. Age and size thresholds for pupation and developmental polymorphism in the browntail moth, Euproctis chrysorrhoea under conditions that either emulate diapause or prevent it. Journal of Insect Physiology, 55 (10) : 952-958.

Quartile : Q1, Sujet : ENTOMOLOGY / Quartile : Q2, Sujet : PHYSIOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Size and age thresholds for pupation are important life history traits of insects. They are the ultimate consequences of the underlying physiological mechanism that optimize resource allocation. Such thresholds may have a plastic response under time-varying environmental conditions, developmental polymorphism (i.e., plasticity in the number of instars before pupation) being a common strategy adopted by insects to overcome this challenging situation. In this study, we systematically explore the variables related with both age and size thresholds for pupation and developmental polymorphism in the browntail moth, Euproctis chrysorrhoea (Lepidoptera: Lymantriidae), by rearing a group of caterpillars under conditions that either emulate larval diapause or prevent it. As an innovative approach, we evaluated the importance of predictor variables by means of generalized linear modeling in a multi-model inference framework. Our results show that (i) rearing conditions affect fitness, (ii) rearing conditions, size of hatchlings, size and age at maturity and sex are related to the number of instars before pupation, and (iii) there are both age and size thresholds for pupation which differ between sexes and between larvae reared under different conditions. Results are discussed in the context of lepidopteran plasticity in life history traits and its relationship with optimal molting strategies.

Mots-clés libres : Age and size thresholds for pupation, Larval diapause, Molting strategies, Multi-model inference, Size of hatchlings

Auteurs et affiliations

• Frago Enric, Université Laval (CAN) ORCID: 0000-0001-8817-1303 - auteur correspondant
• Selfa Jesús, Universidad de Valencia (ESP)
• Pujade-Villar Juli, Universitat de Barcelona (ESP)
• Guara Miguel, Universidad de Valencia (ESP)
• Bauce Eric, Université Laval (CAN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603747/)

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