Influence of larval outbreaks on the climate reconstruction potential of an Arctic shrub

Wilmking, Martin; Buras, Allan; Lehejček, Jiří; Lange, Jelena; Shetti, Rohan; van der Maaten, Ernst

dc.title	Influence of larval outbreaks on the climate reconstruction potential of an Arctic shrub	en
dc.contributor.author	Wilmking, Martin
dc.contributor.author	Buras, Allan
dc.contributor.author	Lehejček, Jiří
dc.contributor.author	Lange, Jelena
dc.contributor.author	Shetti, Rohan
dc.contributor.author	van der Maaten, Ernst
dc.relation.ispartof	Dendrochronologia
dc.identifier.issn	1125-7865 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued	2018
utb.relation.volume	49
dc.citation.spage	36
dc.citation.epage	43
dc.type	article
dc.language.iso	en
dc.publisher	Elsevier GmbH
dc.identifier.doi	10.1016/j.dendro.2018.02.010
dc.relation.uri	https://www.sciencedirect.com/science/article/pii/S1125786517301649
dc.subject	Alnus viridis ssp. crispa	en
dc.subject	Cell wall thickness	en
dc.subject	Eurois occulta	en
dc.subject	Greenland	en
dc.subject	Herbivory	en
dc.subject	Insect attack	en
dc.subject	Plant-climate interaction	en
dc.subject	Shrub rings	en
dc.subject	Tundra	en
dc.description.abstract	Arctic shrubs have a strong potential for climate and environmental reconstructions in the chronically understudied regions of the high northern latitudes. The climate dynamics of these regions are important to understand because of large-scale feedbacks to the global climate system. However, little is known about other factors influencing shrub ring growth, possibly obscuring their climate signal. For example, as of yet we are not able to differentiate between herbivory or climatically induced growth depressions. Here, we use one of the most common Arctic shrubs, Alnus viridis as a test case to address this question. We sampled Alnus in Kobbefjord, Greenland, measured shrub-ring width and cell wall thickness and built site chronologies of each parameter. We analysed climate-growth relationships, tested their stability over time and employed a pointer-year analysis to detect growth depressions. We employed bootstrapped transfer function stability tests (BTFS) to assess the suitability of our shrub chronologies for climate reconstruction. Correlations with climate data showed strong significantly positive and stable correlations between summer temperature and ring-width with the exception of the recent decade. A climate reconstruction model failed stability tests, when the complete period of record was used for calibration and verification. Wood anatomy analysis uncovered the occurrence of unusual cell structure (very thin cell walls) in the exceptionally narrow ring of 2004, a recorded insect outbreak year in other parts of Greenland. When excluding the affected ring and a recovery period, the reconstruction model passed all tests, suggesting that the unusual 2004 ring was not climate driven, but rather the result of an insect attack. When combining anatomical analysis with traditional ring-width measurements, we move a step further in potentially distinguishing small rings caused by insect attacks from small rings formed in climatically challenging years. While this study does not provide unambiguous evidence, it does provide potential useful methodological combinations to enable more robust climate reconstructions in areas where climatic records are extremely sparse. © 2018 Elsevier GmbH	en
utb.faculty	Faculty of Logistics and Crisis Management
dc.identifier.uri	http://hdl.handle.net/10563/1007787
utb.identifier.obdid	43879220
utb.identifier.scopus	2-s2.0-85043355345
utb.identifier.wok	000433995400005
utb.source	j-scopus
dc.date.accessioned	2018-04-23T15:01:44Z
dc.date.available	2018-04-23T15:01:44Z
dc.description.sponsorship	CDFW, California Department of Fish and Wildlife
dc.description.sponsorship	INTERACT, under the European Community's Seventh Framework Programme [262693]; DFG [Wi 2680/8-1]; Internal Grant Agency of Czech University of Life Sciences Prague [20154304]
utb.contributor.internalauthor	Lehejček, Jiří
utb.fulltext.affiliation	Martin Wilmking a, , Allan Buras a,1 , Jiří Lehejček b , Jelena Lange a , Rohan Shetti a , Ernst van der Maaten a,2 a Institute of Botany and Landscape Ecology, University Greifswald, Soldmannstr. 15, 17487 Greifswald, Germany b Department of Environmental Security, Faculty of Logistics and Crisis Management, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic ⁎ Corresponding author. E-mail address: wilmking@uni-greifswald.de (M. Wilmking). 1 Current address: Forest Ecology and Forest Management, Wageningen University and Research, Droevendaalsesteg 3a, 6708 PB Wageningen, The Netherlands. 2 Current address: Forest Growth and Woody Biomass Production, TU Dresden, Pienner Str. 8, 01737 Tharandt, Germany.
utb.fulltext.dates	Received 1 November 2017; Received in revised form 1 February 2018; Accepted 27 February 2018; Available online 02 March 2018
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utb.fulltext.sponsorship	The research received support (logistics and access to the Kobbefjord research station) from INTERACT (grant agreement No. 262693), under the European Community’s Seventh Framework Programme. We thank station manager Katrine Raundrup for logistical help. JeL was supported by DFG Wi 2680/8-1. JiL was supported by the Internal Grant Agency of Czech University of Life Sciences Prague, Project No. 20154304.
utb.scopus.affiliation	Institute of Botany and Landscape Ecology, University Greifswald, Soldmannstr. 15, Greifswald, Germany; Department of Environmental Security, Faculty of Logistics and Crisis Management, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, Zlín, Czech Republic
utb.fulltext.projects	262693
utb.fulltext.projects	DFG Wi 2680/8-1
utb.fulltext.projects	20154304