Distribution of endemic bark beetle attacks and their physiological consequences on Pinus halepensis

Davi Hendrik, Durand Gillmann Marion, Damesin Claire, Delzon Sylvain, Petit Cathleen, Rozenberg Philippe, Sabatier Sylvie-Annabel, Chadœuf Joël, Boutte Bernard, Boivin Thomas. 2020. Distribution of endemic bark beetle attacks and their physiological consequences on Pinus halepensis. Forest Ecology and Management, 469:118187, 11 p.

https://doi.org/10.1016/j.foreco.2020.118187

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q1, Sujet : FORESTRY

Résumé : One factor that determines a tree's resilience capacity to drought is its level of interaction with aggravating biotic factors, such as bark beetles, which in turn depends on whether insect populations are at an endemic or epidemic stage. In a Mediterranean natural forest ecosystem, we investigated the ecophysiological characteristics of trees which (i) predispose Pinus halepensis to attacks of endemic populations of bark beetles (Tomicus destruens) and (ii) that arise as a result of these attacks. The annual life cycle of Tomicus destruens features an initial dispersal phase of sexually mature adults towards pine trunks for the purposes of brood production, and a second dispersal phase of callow adults from trunks to pine shoots for sexual maturation. During a three-year survey of endemic bark beetle attacks in a stand of 178 trees, we found that trees targeted for trunk attacks showed a more aggregated distribution pattern than those targeted for shoot attacks. Moreover, shoot-attacked trees were clearly larger and taller, had lower wood density, and were less exposed to competition than non-attacked trees. No differences were found between the characteristics of trunk-attacked trees and non-attacked ones. We found crown defoliation, lower primary growth and alteration of trunk non-structural carbon in phloem in the year following trunk attacks, although this did not affect vulnerability to cavitation of the vascular system, secondary growth, wood density, and xylem starch. Conversely, the health status and physiological variables of the shoot-attacked trees were not altered, which may be explained by their initial vigor. We conclude that the distribution of Tomicus destruens attacks at the plot level was independent of the ecophysiological traits of the host trees. It was mainly determined by the dispersal strategy of the endemic bark beetle population especially during brood production as only trunk attacks significantly weakened the trees.

Mots-clés Agrovoc : Pinus halepensis, distribution des populations, physiologie végétale, organisme nuisible à la forêt

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : tomicus destruens

Mots-clés libres : Bark beetle, Mediterranean, Endemic, Pinus halepensis, Tree physiology, Sucrose

Classification Agris : H10 - Ravageurs des plantes
K70 - Dégâts causés aux forêts et leur protection

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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