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Insect defoliation modulates influence of climate on the growth of tree species in the boreal mixed forests of eastern Canada

Boakye, Emmanuel Amoah and Houle, Daniel and Bergeron, Yves and Girardin, Martin P. and Drobyshev, Igor (2022). Insect defoliation modulates influence of climate on the growth of tree species in the boreal mixed forests of eastern Canada. Ecology and Evolution. 12 :3 , e8656
[Research article]

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Abstract

Increasing air temperatures and changing precipitation patterns due to climate change can affect tree growth in boreal forests. Periodic insect outbreaks affect the growth trajectory of trees, making it difficult to quantify the climate signal in growth dynamics at scales longer than a year. We studied climate-driven growth trends and the influence of spruce budworm (Choristoneura fumiferana Clem.) outbreaks on these trends by analyzing the basal area increment (BAI) of 2058 trees of Abies balsamea (L.) Mill., Picea glauca (Moench) Voss, Thuja occidentalis L., Populus tremuloides Michx., and Betula papyrifera Marsh, which co-occurs in the boreal mixedwood forests of western Quebec. We used a generalized additive mixed model (GAMM) to analyze species-specific trends in BAI dynamics from 1967 to 1991. The model relied on tree size, cambial age, degree of spruce budworm defoliation, and seasonal climatic variables. Overall, we observed a decreasing growth rate of the spruce budworm host species, A. balsamea and P. glauca between 1967 and 1991, and an increasing growth rate for the non-host, P. tremuloides, B. papyrifera, and T. occidentalis. Our results suggest that insect outbreaks may offset growth increases resulting from a warmer climate. The observation warrants the inclusion of the spruce budworm defoliation into models predicting future forest productivity.

Authors/Creators:Boakye, Emmanuel Amoah and Houle, Daniel and Bergeron, Yves and Girardin, Martin P. and Drobyshev, Igor
Title:Insect defoliation modulates influence of climate on the growth of tree species in the boreal mixed forests of eastern Canada
Series Name/Journal:Ecology and Evolution
Year of publishing :2022
Volume:12
Number:3
Article number:e8656
Number of Pages:11
Publisher:WILEY
ISSN:2045-7758
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:boreal mixedwoods, climate change, dendrochronology, hardwoods, insect outbreak, natural disturbances
URN:NBN:urn:nbn:se:slu:epsilon-p-116720
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116720
Additional ID:
Type of IDID
DOI10.1002/ece3.8656
Web of Science (WoS)000774827300001
ID Code:27590
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: SLUpub Connector
Deposited On:21 Apr 2022 15:11
Metadata Last Modified:12 Sep 2022 08:18

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