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Regulation of forest defoliating insects through small mammal predation

reconsidering the mechanisms

Kollberg, Ida and Bylund, Helena and Huitu, Otso and Björkman, Christer (2014). Regulation of forest defoliating insects through small mammal predation. Oecologia. 176:4, 975-983
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Official URL: http://dx.doi.org/10.1007/s00442-014-3080-x

Abstract

Population densities of forest defoliating insects may be regulated by small mammal predation on the pupae. When outbreaks do occur, they often coincide with warm, dry weather and at barren forest sites. A proposed reason for this is that weather and habitat affect small mammal population density (numerical response) and hence pupal predation. We propose an alternative explanation: weather and habitat affect small mammal feeding behaviour (functional response) and hence the outbreak risks of forest pest insects. We report results from laboratory and field-enclosure experiments estimating rates of pupal predation by bank voles (Myodes glareolus) on an outbreak insect, the European pine sawfly (Neodiprion sertifer), at different temperatures (15 and 20 A degrees C), in different microhabitats (sheltered and non-sheltered), and with or without access to alternative food (sunflower seeds). We found that the probability of a single pupa being eaten at 20 A degrees C was lower than at 15 A degrees C (0.49 and 0.72, respectively). Pupal predation was higher in the sheltered microhabitat than in the open one, and the behaviour of the voles differed between microhabitats. More pupae were eaten in situ in the sheltered microhabitat whereas in the open area more pupae were removed and eaten elsewhere. Access to alternative food did not affect pupal predation. The results suggest that predation rates on pine sawfly pupae by voles are influenced by temperature- and habitat-induced variation in the physiology and behaviour of the predator, and not necessarily solely through effects on predator densities as previously proposed.

Authors/Creators:Kollberg, Ida and Bylund, Helena and Huitu, Otso and Björkman, Christer
Title:Regulation of forest defoliating insects through small mammal predation
Subtitle:reconsidering the mechanisms
Series/Journal:Oecologia (1432-1939)
Year of publishing :2014
Volume:176
Number:4
Page range:975-983
Number of Pages:9
Publisher:Springer Verlag
ISSN:1432-1939
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
L Animal production > L20 Animal ecology
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
Agrovoc terms:herbivores, natural enemies, population dynamics
Keywords:herbivore, functional response, natural enemies, outbreaks, population dynamics
URN:NBN:urn:nbn:se:slu:epsilon-e-2614
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2614
Additional ID:
Type of IDID
Web of Science (WoS)000345146700007
ID Code:12089
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:05 May 2015 06:44
Metadata Last Modified:06 Feb 2016 07:28

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