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Local colonization-extinction dynamics of a tree-killing bark beetle during a large-scale outbreak

Kärvemo, Simon and Johansson, Victor and Schroeder, Martin and Ranius, Thomas (2016). Local colonization-extinction dynamics of a tree-killing bark beetle during a large-scale outbreak. Ecosphere. 7:3, 1-14
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Abstract

Forest pest insects may cause large-scale tree growth reductions and tree mortality during outbreaks. The large-scale development of outbreaks has frequently been studied, while the colonization-extinction dynamics during outbreaks is less known. We study the colonization-extinction dynamics of a severe tree-killing bark beetle, Ips typographus, during an outbreak across a 130000ha forest landscape in southern Sweden. We recorded annual colonization and extinction events in 1ha pixels across the landscape by helicopter surveys during three consecutive years, and modeled colonization and extinction probabilities based on focal pixel quality, local population size, connectivity to surrounding beetle populations, and tree composition in the surrounding landscape. The local populations had a high turnover; 81-93% of all occupied pixels were the result of colonizations in the same year and the annual extinction rates were 84-90%. The colonization probability increased and the extinction probability decreased with increasing spruce (host-tree) volume in focal pixels and the connectivity. The fitted spatial scaling parameter of the connectivity measure suggested that the colonization probability was mainly affected by the number of surrounding occupied pixels within a few hundred meters. The colonization probability also decreased with increasing volume of birch (a nonhost) in the focal pixel, while the extinction probability decreased with increasing local population size. In conclusion, the local population size and quality of the focal pixel explained more of the colonization and extinction probability than the connectivity and composition of surrounding forest. The distribution of tree-killing bark beetles during outbreaks can be patchy and highly dynamic. Two reasons for this are the increased probability of successful attacks when exceeding a critical attack density and the fragmented distribution of large spruce volumes throughout the forest landscape.

Authors/Creators:Kärvemo, Simon and Johansson, Victor and Schroeder, Martin and Ranius, Thomas
Title:Local colonization-extinction dynamics of a tree-killing bark beetle during a large-scale outbreak
Series/Journal:Ecosphere (2150-8925)
Year of publishing :2016
Volume:7
Number:3
Page range:1-14
Number of Pages:14
Publisher:Ecological Society of America, ESA
ISSN:2150-8925
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Zoology
Agrovoc terms:forestry, pest insects
Keywords:connectivity, forest insect pest, Ips typographus, landscape, metapopulation, nonhost volatiles, Norway spruce, spatial dynamics. 
URN:NBN:urn:nbn:se:slu:epsilon-e-3550
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3550
Additional ID:
Type of IDID
Web of Science (WoS)000374896800020
DOI10.1002/ecs2.1257
ID Code:13457
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:FORMAS
Deposited By: SLUpub Connector
Deposited On:05 Jul 2016 09:18
Metadata Last Modified:05 Jul 2016 09:18

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