Article (Scientific journals)
Effects of fluctuating thermal regimes on cold survival and life history traits of the spotted wing Drosophila (Drosophila suzukii).
Enriquez, Thomas; Ruel, David; Charrier, Maryvonne et al.
2018In Insect Science, 27 (2), p. 317 - 335
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Keywords :
cold storage; fluctuating thermal regimes; life-history traits; recovery; spotted wing drosophila; Animals; Drosophila/physiology; Female; Fertility; Male; Sexual Behavior, Animal; Cold-Shock Response; Life History Traits; Drosophila; Ecology, Evolution, Behavior and Systematics; Agronomy and Crop Science; Biochemistry, Genetics and Molecular Biology (all); Insect Science; General Biochemistry, Genetics and Molecular Biology
Abstract :
[en] Drosophila suzukii is an invasive pest causing severe damages to a large panel of cultivated crops. To facilitate its biocontrol with strategies such as sterile or incompatible insect techniques, D. suzukii must be mass-produced and then stored and transported under low temperature. Prolonged cold exposure induces chill injuries that can be mitigated if the cold period is interrupted with short warming intervals, referred to as fluctuating thermal regimes (FTR). In this study, we tested how to optimally use FTR to extend the shelf life of D. suzukii under cold storage. Several FTR parameters were assessed: temperature (15, 20, 25 °C), duration (0.5, 1, 2, 3 h), and frequency (every 12, 24, 36, 48 h) of warming intervals, in two wild-type lines and in two developmental stages (pupae and adults). Generally, FTR improved cold storage tolerance with respect to constant low temperatures (CLT). Cold mortality was lower when recovery temperature was 20 °C or higher, when duration was 2 h per day or longer, and when warming interruptions occurred frequently (every 12 or 24 h). Applying an optimized FTR protocol to adults greatly reduced cold mortality over long-term storage (up to 130 d). Consequences of FTR on fitness-related traits were also investigated. For adults, poststorage survival was unaffected by FTR, as was the case for female fecundity and male mating capacity. On the other hand, when cold storage occurred at pupal stage, poststorage survival and male mating capacity were altered under CLT, but not under FTR. After storage of pupae, female fecundity was lower under FTR compared to CLT, suggesting an energy trade-off between repair of chill damages and egg production. This study provides detailed information on the application and optimization of an FTR-based protocol for cold storage of D. suzukii that could be useful for the biocontrol of this pest.
Disciplines :
Entomology & pest control
Environmental sciences & ecology
Author, co-author :
Enriquez, Thomas  ;  Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs ; CNRS, ECOBIO-UMR 6553, Université de Rennes, Rennes, France
Ruel, David;  CNRS, ECOBIO-UMR 6553, Université de Rennes, Rennes, France
Charrier, Maryvonne ;  CNRS, ECOBIO-UMR 6553, Université de Rennes, Rennes, France
Colinet, Hervé ;  CNRS, ECOBIO-UMR 6553, Université de Rennes, Rennes, France
Language :
English
Title :
Effects of fluctuating thermal regimes on cold survival and life history traits of the spotted wing Drosophila (Drosophila suzukii).
Publication date :
01 November 2018
Journal title :
Insect Science
ISSN :
1672-9609
eISSN :
1744-7917
Publisher :
Blackwell Publishing Ltd, Australia
Volume :
27
Issue :
2
Pages :
317 - 335
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ANR - Agence Nationale de la Recherche
FWF - Austrian Science Fund
Funding text :
This study was funded by SUZUKILL project (The French National Research Agency): ANR-15-CE21-0017 and Austrian Science Fund (FWF): I 2604-B25. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. We would like to thanks Gaëtan CORMY, bachelor student, for his valuable help on the flies mating assays.
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since 13 December 2022

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