More intraguild prey than pest species in arachnid diets may compromise biological control in apple orchards

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Hambäck, Peter A.Stockholms universitet,Institutionen för ekologi, miljö och botanik (author)

More intraguild prey than pest species in arachnid diets may compromise biological control in apple orchards

Article/chapterEnglish2021

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Elsevier BV,2021
printrdacarrier

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LIBRIS-ID:oai:DiVA.org:su-198622
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-198622URI
https://doi.org/10.1016/j.baae.2021.09.006DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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Understanding the full diet of natural enemies is necessary for evaluating their role as biocontrol agents, because many enemy species do not only feed on pests but also on other natural enemies. Such intraguild predation can compromise pest control if the consumed enemies are actually better for pest control than their predators. In this study, we used gut metabarcoding to quantify diets of all common arachnid species in Swedish and Spanish apple orchards. For this purpose, we designed new primers that reduce amplification of arachnid predators while retaining high amplification of all prey groups. Results suggest that most arachnids consume a large range of putative pest species on apple but also a high proportion of other natural enemies, where the latter constitute almost a third of all prey sequences. Intraguild predation also varied between regions, with a larger content of heteropteran bugs in arachnid guts from Spanish orchards, but not between orchard types. There was also a tendency for cursorial spiders to have more intraguild prey in the gut than web spiders. Two groups that may be overlooked as important biocontrol agents in apple orchards seem to be theridiid web spiders and opilionids, where the latter had several small-bodied pest species in the gut. These results thus provide important guidance for what arachnid groups should be targets of management actions, even though additional information is needed to quantify all direct and indirect interactions occurring in the complex arthropod food webs in fruit orchards.

Subject headings and genre

NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
Gut metabarcoding
Philodromus
Opiliones
Theridiidae
Araneidae

Added entries (persons, corporate bodies, meetings, titles ...)

Cirtwill, Alyssa R.Stockholms universitet,Institutionen för ekologi, miljö och botanik(Swepub:su)alci5182 (author)
García, D. (author)
Grudzinska-Sterno, MagdalenaStockholms universitet,Institutionen för ekologi, miljö och botanik (author)
Miñarro, M. (author)
Tasin, M. (author)
Yang, XuyueStockholms universitet,Institutionen för ekologi, miljö och botanik(Swepub:su)xuyan (author)
Samnegård, Ulrika,1985-Stockholms universitet,Institutionen för ekologi, miljö och botanik(Swepub:su)usamn (author)
Stockholms universitetInstitutionen för ekologi, miljö och botanik (creator_code:org_t)

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In:Basic and Applied Ecology: Elsevier BV57, s. 1-131439-17911618-0089

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