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Enhanced leaf nitrogen status stabilizes omnivore population density

Liman, Anna-Sara and Dalin, Peter and Björkman, Christer (2017). Enhanced leaf nitrogen status stabilizes omnivore population density. Oecologia. 183, 57-65
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Abstract

Plant traits can mediate the strength of interactions between omnivorous predators and their prey through density effects and changes in the omnivores' trophic behavior. In this study, we explored the established assumption that enhanced nutrient status in host plants strengthens the buffering effect of plant feeding for omnivorous predators, i.e., prevents rapid negative population growth during prey density decline and thereby increases and stabilizes omnivore population density. We analyzed 13 years of field data on population densities of a heteropteran omnivore on Salix cinerea stands, arranged along a measured leaf nitrogen gradient and found a 195 % increase in omnivore population density and a 63 % decrease in population variability with an increase in leaf nitrogen status from 26 to 40 mgN x g(-1). We recreated the leaf nitrogen gradient in a greenhouse experiment and found, as expected, that increasing leaf nitrogen status enhanced omnivore performance but reduced per capita prey consumption. Feeding on high nitrogen status host plants can potentially decouple omnivore-prey population dynamics and allow omnivores to persist and function effectively at low prey densities to provide "background level" control of insect herbivores. This long-term effect is expected to outweigh the short-term effect on per capita prey consumption-resulting in a net increase in population predation rates with increasing leaf nitrogen status. Conservation biological control of insect pests that makes use of omnivore background control could, as a result, be manipulated via management of crop nitrogen status.

Authors/Creators:Liman, Anna-Sara and Dalin, Peter and Björkman, Christer
Title:Enhanced leaf nitrogen status stabilizes omnivore population density
Series/Journal:Oecologia (1432-1939)
Year of publishing :2017
Volume:183
Page range:57-65
Number of Pages:9
Publisher:Springer
ISSN:1432-1939
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
Agrovoc terms:omnivory, population dynamics, population ecology, Salix
Keywords:Plant traits, Trophic omnivory, Population dynamics, Trophic status, Leaf nitrogen
URN:NBN:urn:nbn:se:slu:epsilon-e-4473
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4473
Additional ID:
Type of IDID
DOI10.1007/s00442-016-3742-y
Web of Science (WoS)000392391300006
ID Code:14702
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:13 Nov 2017 11:41
Metadata Last Modified:13 Nov 2017 11:41

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