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Water stress and insect herbivory interactively reduce crop yield while the insect pollination benefit is conserved

Raderschall, Chloë and Vico, Giulia and Lundin, Ola and Taylor, Astrid and Bommarco, Riccardo (2021). Water stress and insect herbivory interactively reduce crop yield while the insect pollination benefit is conserved. Global Change Biology. 27 , 71-83
[Research article]

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Abstract

Climate change is predicted to hamper crop production due to precipitation deficits and warmer temperatures inducing both water stress and increasing herbivory due to more abundant insect pests. Consequently, crop yields will be impacted simultaneously by abiotic and biotic stressors. Extensive yield losses due to such climate change stressors might, however, be mitigated by ecosystem services such as insect pollination. We examined the single and combined effects of water stress, insect herbivory and insect pollination on faba bean yield components and above- and belowground plant biomass under realistic field conditions. We used rainout shelters to simulate a scenario in line with climate change projections, with adequate water supply at sowing followed by a long period without precipitation. This induced a gradually increasing water stress, culminating around crop flowering and yield formation. We found that gradually increasing water stress combined with insect herbivory by aphids interactively shaped yield in faba beans. Individually, aphid herbivory reduced yield by 79% and water stress reduced yield by 52%. However, the combined effect of water stress and aphid herbivory reduced yield less (84%) than the sum of the individual stressor effects. In contrast, insect pollination increased yield by 68% independently of water availability and insect herbivory. Our results suggest that yield losses can be greatly reduced when both water stress and insect herbivory are reduced simultaneously. In contrast, reducing only one stressor has negligible benefits on yield as long as the crop is suffering from the other stressor. We call for further exploration of interactions among ecosystem services and biotic and abiotic stressors that simulate realistic conditions under climate change.

Authors/Creators:Raderschall, Chloë and Vico, Giulia and Lundin, Ola and Taylor, Astrid and Bommarco, Riccardo
Title:Water stress and insect herbivory interactively reduce crop yield while the insect pollination benefit is conserved
Series Name/Journal:Global Change Biology
Year of publishing :2021
Volume:27
Page range:71-83
Number of Pages:13
Publisher:WILEY
ISSN:1354-1013
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:climate change, drought, faba bean, herbivory, insect pollination, water stress
URN:NBN:urn:nbn:se:slu:epsilon-p-108831
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108831
Additional ID:
Type of IDID
DOI10.1111/gcb.15386
Web of Science (WoS)000584666100001
ID Code:23347
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology

(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: SLUpub Connector
Deposited On:26 Apr 2021 06:43
Metadata Last Modified:26 Apr 2021 06:51

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