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Insects 2015, 6(1), 112-121; doi:10.3390/insects6010112

Do Offspring of Insects Feeding on Defoliation-Resistant Trees Have Better Biological Performance When Exposed to Nutritionally-Imbalanced Food?

1
Faculté de foresterie, de géographie et de Géomatique Université Laval, Québec, QC G1V 0A6, Canada
2
Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC H4B 1R6, Canada
3
Direction de l'aménagement et de l'environnement forestiers Ministère des Forêts, de la Faune et des Parcs, 5700, 4e Av. Ouest, Québec, QC G1V 0A6, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Brian T. Forschler
Received: 3 October 2014 / Accepted: 7 January 2015 / Published: 12 January 2015
View Full-Text   |   Download PDF [265 KB, uploaded 12 January 2015]   |  

Abstract

White spruce (Picea glauca (Moench) Voss) trees that are resistant or susceptible to spruce budworm (Choristoneura fumiferana (Clem.)) attack were identified in a southern Quebec plantation. Due to high mortality-induced selective pressures imposed by resistant trees on spruce budworm larvae, insects that survive on resistant trees exhibited greater biological performance than those on susceptible trees. We tested the hypothesis that this better biological performance is maintained across generations when progeny were subjected to nutritional stress. We collected pupae from resistant and susceptible trees (phenotype). Adults were reared under controlled laboratory conditions. Progeny were subsequently reared on two types of artificial diet (high vs. low quality). Low quality diet simulated food quality deterioration during outbreak conditions. Results confirmed that surviving insects collected from resistant trees have better performance than those from susceptible trees. Offspring performance (pupal mass, developmental time) was affected only by diet quality. These results suggest that adaptive advantages that would be acquired from parents fed on resistant trees are lost when progeny are exposed to nutritionally-imbalanced food, but the effects persist when larvae are fed a balanced diet. Offspring mortality, fecundity and fertility were positively influenced by parental origin (tree phenotype). View Full-Text
Keywords: adaptation; Choristoneura fumiferana; Picea glauca; spruce budworm; tree resistance adaptation; Choristoneura fumiferana; Picea glauca; spruce budworm; tree resistance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Quezada-Garcia, R.; Fuentealba, A.; Nguyen, N.; Bauce, É. Do Offspring of Insects Feeding on Defoliation-Resistant Trees Have Better Biological Performance When Exposed to Nutritionally-Imbalanced Food? Insects 2015, 6, 112-121.

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