Species Climatic Suitability Explains Insect–Host Dynamics in the Southern Rocky Mountains, USA

Jaime, Luciana; Hart, Sarah J.; Lloret, Francisco; Veblen, Thomas T.; Andrus, Robert A.; Rodman, Kyle C.; Batllori, Enric

doi:10.1007/s10021-021-00643-7

Cited by 4 publications

(3 citation statements)

References 55 publications

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“…‘outbreaks’), beetles can successfully colonize most hosts within a stand (Aukema et al, 2016; Boone et al, 2011). Outbreak development is complex but requires an abundance of suitable host trees, which often reflects disturbance history (Kulakowski et al, 2012; Veblen et al, 1994) and abiotic factors (Jaime et al, 2022). Given available hosts, large‐scale outbreaks can occur when above‐average temperatures increase overwinter insect survival and drought conditions limit host tree defences (Anderegg, Hicke, et al, 2015; Howe et al, 2022; Raffa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Rocky Mountain forests are poised to recover following bark beetle outbreaks but with altered composition

et al. 2022

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1. Amplified by warming temperatures and drought, recent outbreaks of native bark beetles (Curculionidae: Scolytinae) have caused extensive tree mortality throughout Europe and North America. Despite their ubiquitous nature and important effects on ecosystems, forest recovery following such disturbances is poorly understood, particularly across regions with varying abiotic conditions and outbreak effects. 2. To better understand post-outbreak recovery across a topographically complex region, we synthesized data from 16 field studies spanning subalpine forests in the Southern Rocky Mountains, USA. From 1997 to 2019, these forests were heavily affected by outbreaks of three native bark beetle species (Dendroctonus ponderosae, Dendroctonus rufipennis and Dryocoetes confusus). We compared pre-and post-outbreak forest conditions and developed region-wide predictive maps of post-outbreak (1) live basal areas, (2) juvenile densities and (3) height

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Section: Introductionmentioning

confidence: 99%

Rocky Mountain forests are poised to recover following bark beetle outbreaks but with altered composition

et al. 2022

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“…Although higher tree defense capacity may be expected in host tree populations located close to their climatic optimum due to a better species performance (Abeli et al, 2014; Martínez‐Meyer et al, 2013; Sexton et al, 2009), several studies have reported that tree populations established in climatically suitable locations are more likely to be infested when such locations are also suitable for bark beetles (e.g., Jaime et al, 2019), particularly under the influence of drought events (Jaime et al, 2021; Kleinman et al, 2012; Lloret & Kitzberger, 2018). This is reflected in our analyses, as the most attacked forest plots were the ones that experienced long‐lasting droughts with a moderate maximum intensity during the 10 years before the beetle attack, which could have strongly depleted hosts’ resistance (Huang et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…The response of a particular forest to bark beetle disturbance could also be influenced by its environmental position within the climatic niche of the species involved (Jaime et al, 2019, 2021; Lloret & Kitzberger, 2018). According to the niche theory, species performance declines from the niche optimum (or center) to the edge (or margin) of the species’ niche (Carscadden et al, 2020; Hutchinson, 1957).…”

Section: Introductionmentioning

confidence: 99%

Climatic and stand drivers of forest resistance to recent bark beetle disturbance in European coniferous forests

Jaime

Batllori

Ferretti

et al. 2022

Global Change Biology

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Bark beetle infestation is a major driver of tree mortality that may be critical for forest persistence under climate change and the forecasted increase of extreme heat and drought episodes. Under this context, the environmental position of host tree populations within the species’ climatic niche (central vs. marginal populations) is expected to be a determinant in the dynamics of insect–host systems. Here, we analyzed the recent patterns of bark beetle disturbance and forest resistance across European coniferous forests during the 2010–2018 period. We obtained bark beetle attack and tree mortality data from successive continental‐scale forest condition surveys on 130 plots including five host trees and five bark beetle species, and characterized the climatic niche of each species. Then, we analyzed the overall forest resistance and species‐specific responses, in terms of bark beetle attack and induced tree mortality, in relation to the distance to the niche optimum of both host tree and beetle species, previous drought events, and plot characteristics. Regional patterns of recent disturbance revealed that forests in central, north, and east of Europe could be at risk under the attack of multivoltine bark beetle species. We found that overall forest resistance to beetle attack was determined by several driving factors, which varied among species responses. Particularly, the environmental position of the affected forest within the host and beetle species’ climatic niche and plot characteristics mediated the influence of drought on the resistance to beetle attack. In turn, forest resistance to induced tree mortality was determined exclusively by the maximum intensity and duration of drought events. Our findings highlight the importance of disturbance interactions and suggest that the joint influence of drought events and bark beetle disturbance will threaten the persistence of European coniferous forests, even in those tree populations close to their species' climatic optimum.

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Bark beetle outbreaks in coniferous forests: a review of climate change effects

Jaime,

Batllori,

Lloret

2023

Eur J Forest Res

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Species Climatic Suitability Explains Insect–Host Dynamics in the Southern Rocky Mountains, USA

Cited by 4 publications

References 55 publications

Rocky Mountain forests are poised to recover following bark beetle outbreaks but with altered composition

Rocky Mountain forests are poised to recover following bark beetle outbreaks but with altered composition

Climatic and stand drivers of forest resistance to recent bark beetle disturbance in European coniferous forests

Bark beetle outbreaks in coniferous forests: a review of climate change effects

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