Tree mortality from drought, insects, and their interactions in a changing climate

New Phytologist
By: , and 



Climate change is expected to drive increased tree mortality through drought, heat stress, and insect attacks, with manifold impacts on forest ecosystems. Yet, climate-induced tree mortality and biotic disturbance agents are largely absent from process-based ecosystem models. Using data sets from the western USA and associated studies, we present a framework for determining the relative contribution of drought stress, insect attack, and their interactions, which is critical for modeling mortality in future climates. We outline a simple approach that identifies the mechanisms associated with two guilds of insects – bark beetles and defoliators – which are responsible for substantial tree mortality. We then discuss cross-biome patterns of insect-driven tree mortality and draw upon available evidence contrasting the prevalence of insect outbreaks in temperate and tropical regions. We conclude with an overview of tools and promising avenues to address major challenges. Ultimately, a multitrophic approach that captures tree physiology, insect populations, and tree–insect interactions will better inform projections of forest ecosystem responses to climate change.

Publication type Article
Publication Subtype Journal Article
Title Tree mortality from drought, insects, and their interactions in a changing climate
Series title New Phytologist
DOI 10.1111/nph.13477
Volume 208
Issue 3
Year Published 2015
Language English
Publisher Wiley
Contributing office(s) Fort Collins Science Center, Western Ecological Research Center
Description 10 p.
First page 674
Last page 683
Online Only (Y/N) N
Additional Online Files (Y/N) N
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