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Modeling Climatic Influences on Three Parasitoids of Low-Density Spruce Budworm Populations. Part 1: Tranosema rostrale (Hymenoptera: Ichneumonidae)
Article

Modeling Climatic Influences on Three Parasitoids of Low-Density Spruce Budworm Populations. Part 2: Meteorus trachynotus (Hymenoptera: Braconidae)

1
Natural Resources Canada, Canadian Forest Service, Quebec, QC G1V 4C7, Canada
2
Direction de la Protection des Forêts, Ministère des Forêts, de la Faune et des Parcs du Québec, 2700 rue Einstein, Québec, QC G1P 3W8, Canada
*
Author to whom correspondence should be addressed.
Academic Editors: Jakub Horák and Adam Véle
Forests 2021, 12(2), 155; https://doi.org/10.3390/f12020155
Received: 10 December 2020 / Revised: 21 January 2021 / Accepted: 25 January 2021 / Published: 28 January 2021
(This article belongs to the Special Issue Impact of Global Change on Insect Biodiversity in Forests)
This is the second article of a series of three where we develop temperature-driven models to describe the seasonal interactions between parasitoids and their hosts which we use to explore the impact of climate on their spatiotemporal biology. Here, we model the biology of Meteorus trachynotus (Hymenoptera: Braconidae) with an individual-based model of its daily interactions with two host species. This model predicts the performance of the parasitoid in response to temperature affecting its seasonal development and that of the two hosts. We compare model output with an extensive set of field observations from natural host populations. The predicted activity of the first adult parasitoid generation closely matches the seasonal pattern of attack on the spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae) within the limitations of available data. The model predicts 1–4 full generations of M. trachynotus per year in eastern North America, with generations well synchronized with larvae of a known overwintering host, the obliquebanded leafroller Choristoneura rosaceana. The model predicts the observed density dependence of parasitism on spruce budworm. Predicted performance exhibits spatial variation caused by complex life-history interactions, especially synchrony with the overwintering host. This leads to a better performance in warm but not hot environments at middle latitudes and elevations. The model’s predicted spatial patterns correspond closely to our field observations on the frequency of parasitism on spruce budworm. Under climate change, the model predicts that the performance of M. trachynotus populations will improve in the northern portion of its range. View Full-Text
Keywords: biodiversity; ecology; environment; forest; global change; insect; parasitoids; spruce budworm; obliquebanded leafroller; seasonal biology; host synchrony biodiversity; ecology; environment; forest; global change; insect; parasitoids; spruce budworm; obliquebanded leafroller; seasonal biology; host synchrony
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MDPI and ACS Style

Régnière, J.; Saint-Amant, R.; Thireau, J.-C.; Therrien, P.; Hébert, C.; Martel, V. Modeling Climatic Influences on Three Parasitoids of Low-Density Spruce Budworm Populations. Part 2: Meteorus trachynotus (Hymenoptera: Braconidae). Forests 2021, 12, 155. https://doi.org/10.3390/f12020155

AMA Style

Régnière J, Saint-Amant R, Thireau J-C, Therrien P, Hébert C, Martel V. Modeling Climatic Influences on Three Parasitoids of Low-Density Spruce Budworm Populations. Part 2: Meteorus trachynotus (Hymenoptera: Braconidae). Forests. 2021; 12(2):155. https://doi.org/10.3390/f12020155

Chicago/Turabian Style

Régnière, Jacques; Saint-Amant, Rémi; Thireau, Jean-Claude; Therrien, Pierre; Hébert, Christian; Martel, Véronique. 2021. "Modeling Climatic Influences on Three Parasitoids of Low-Density Spruce Budworm Populations. Part 2: Meteorus trachynotus (Hymenoptera: Braconidae)" Forests 12, no. 2: 155. https://doi.org/10.3390/f12020155

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