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Tree-ring isotopes from the Swiss Alps reveal non-climatic fingerprints of cyclic insect population outbreaks over the past 700 years
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SYSNO ASEP 0574055 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Tree-ring isotopes from the Swiss Alps reveal non-climatic fingerprints of cyclic insect population outbreaks over the past 700 years Author(s) Vitali, V. (DE)
Peters, R. L. (CH)
Lehmann, M. M. (CH)
Leuenberger, M. (CH)
Treydte, K. (CH)
Büntgen, Ulf (UEK-B) RID, ORCID, SAI
Schuler, P. (CH)
Saurer, M. (CH)Source Title Tree Physiology - ISSN 0829-318X
Roč. 43, č. 5 (2023), s. 706-721Number of pages 16 s. Language eng - English Country GB - United Kingdom Keywords dendroecology ; deuterium ; ecophysiology ; insect defoliation ; insect outbreak ; plant-pathogen interaction ; stable isotope ; tree physiology ; tree-ring cellulose ; zeiraphera griseana Subject RIV GK - Forestry OECD category Forestry Research Infrastructure CzeCOS IV - 90248 - Ústav výzkumu globální změny AV ČR, v. v. i. Method of publishing Open access Institutional support UEK-B - RVO:86652079 UT WOS 000951722300001 EID SCOPUS 85162858370 DOI 10.1093/treephys/tpad014 Annotation Recent experiments have underlined the potential of delta H-2 in tree-ring cellulose as a physiological indicator of shifts in autotrophic versus heterotrophic processes (i.e., the use of fresh versus stored non-structural carbohydrates). However, the impact of these processes has not yet been quantified under natural conditions. Defoliator outbreaks disrupt tree functioning and carbon assimilation, stimulating remobilization, therefore providing a unique opportunity to improve our understanding of changes in delta H-2. By exploring a 700-year tree-ring isotope chronology from Switzerland, we assessed the impact of 79 larch budmoth (LBM, Zeiraphera griseana [Hubner]) outbreaks on the growth of its host tree species, Larix decidua [Mill]. The LBM outbreaks significantly altered the tree-ring isotopic signature, creating a H-2-enrichment and an O-18- and C-13-depletion. Changes in tree physiological functioning in outbreak years are shown by the decoupling of delta H-2 and delta O-18 (O-H relationship), in contrast to the positive correlation in non-outbreak years. Across the centuries, the O-H relationship in outbreak years was not significantly affected by temperature, indicating that non-climatic physiological processes dominate over climate in determining delta H-2. We conclude that the combination of these isotopic parameters can serve as a metric for assessing changes in physiological mechanisms over time. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2024 Electronic address https://academic.oup.com/treephys/article/43/5/706/7026060?login=true
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