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Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency

Sanaa N. Alhadidi, Mike Fowler Orcid Logo, John N. Griffin

BioControl

Swansea University Author: Mike Fowler Orcid Logo

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DOI (Published version): 10.1007/s10526-019-09936-2

Abstract

Many studies demonstrate an important role of natural enemy biodiversity in the regulation of agricultural pests, but the role of different aspects of biodiversity in influencing this crucial ecosystem service remain controversial. We hypothesised that the functional diversity generated by combining...

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Published in: BioControl
ISSN: 1386-6141 1573-8248
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa49971
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first_indexed 2019-04-15T09:29:09Z
last_indexed 2019-05-07T15:47:12Z
id cronfa49971
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spelling 2019-05-03T15:07:12.3063796 v2 49971 2019-04-11 Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency a3a29027498d4b43a3f082a0a5ba16b4 0000-0003-1544-0407 Mike Fowler Mike Fowler true false 2019-04-11 SBI Many studies demonstrate an important role of natural enemy biodiversity in the regulation of agricultural pests, but the role of different aspects of biodiversity in influencing this crucial ecosystem service remain controversial. We hypothesised that the functional diversity generated by combining divergent consumer groups (roaming coccinellid predators and parasitoid wasps) fosters complementarity, enhancing aphid biocontrol. We tested this using experimental mesocosms containing plants, aphids and natural enemies located in a greenhouse. We compared the aphid control efficiency (final aphid abundance) of low functional diversity treatments (two parasitoid species, or two predator species) with high functional diversity treatments (all four possible predator-parasitoid combinations). We also included all four enemies as single species treatments to allow calculation of the non-additive effects of combining natural enemies. Results showed that biocontrol (final aphid abundance) was driven by the species identity of natural enemies and positive non-additive effects in two treatments in which the most efficient predator species was combined with a parasitoid species and the other predator species, respectively. Functional diversity did not consistently influence biocontrol or non-additive effects. In conclusion, functional diversity, as defined by differences between roaming predator and parasitoid functional groups, failed to consistently explain biocontrol efficiency in our study. This calls for consideration of finer-scale functional traits and how they govern natural enemy interactions and cascading effects across ecosystems. Journal Article BioControl 1386-6141 1573-8248 30 4 2019 2019-04-30 10.1007/s10526-019-09936-2 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University Institution 2019-05-03T15:07:12.3063796 2019-04-11T13:27:16.1887882 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Sanaa N. Alhadidi 1 Mike Fowler 0000-0003-1544-0407 2 John N. Griffin 3 0049971-11042019132931.pdf Alhadidi_etal_2019_BioControl.pdf 2019-04-11T13:29:31.9570000 Output 318589 application/pdf Version of Record true 2019-04-11T00:00:00.0000000 Released under the terms of a Creative Commons Attribution 4.0 International License (CC-BY). true eng
title Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
spellingShingle Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
Mike Fowler
title_short Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
title_full Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
title_fullStr Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
title_full_unstemmed Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
title_sort Functional diversity of predators and parasitoids does not explain aphid biocontrol efficiency
author_id_str_mv a3a29027498d4b43a3f082a0a5ba16b4
author_id_fullname_str_mv a3a29027498d4b43a3f082a0a5ba16b4_***_Mike Fowler
author Mike Fowler
author2 Sanaa N. Alhadidi
Mike Fowler
John N. Griffin
format Journal article
container_title BioControl
publishDate 2019
institution Swansea University
issn 1386-6141
1573-8248
doi_str_mv 10.1007/s10526-019-09936-2
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Many studies demonstrate an important role of natural enemy biodiversity in the regulation of agricultural pests, but the role of different aspects of biodiversity in influencing this crucial ecosystem service remain controversial. We hypothesised that the functional diversity generated by combining divergent consumer groups (roaming coccinellid predators and parasitoid wasps) fosters complementarity, enhancing aphid biocontrol. We tested this using experimental mesocosms containing plants, aphids and natural enemies located in a greenhouse. We compared the aphid control efficiency (final aphid abundance) of low functional diversity treatments (two parasitoid species, or two predator species) with high functional diversity treatments (all four possible predator-parasitoid combinations). We also included all four enemies as single species treatments to allow calculation of the non-additive effects of combining natural enemies. Results showed that biocontrol (final aphid abundance) was driven by the species identity of natural enemies and positive non-additive effects in two treatments in which the most efficient predator species was combined with a parasitoid species and the other predator species, respectively. Functional diversity did not consistently influence biocontrol or non-additive effects. In conclusion, functional diversity, as defined by differences between roaming predator and parasitoid functional groups, failed to consistently explain biocontrol efficiency in our study. This calls for consideration of finer-scale functional traits and how they govern natural enemy interactions and cascading effects across ecosystems.
published_date 2019-04-30T04:01:15Z
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score 11.016235

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