Beyond polyphagy and opportunism: natural prey of hunting spiders in the canopy of apple trees.
Araneae
Beneficial arthropods
Biocontrol potential
Carrhotus xanthogramma
Food web
Intraguild predation
Natural diet
Ontogenetic shift
Philodromus cespitum
Trophic niche
Journal
PeerJ
ISSN: 2167-8359
Titre abrégé: PeerJ
Pays: United States
ID NLM: 101603425
Informations de publication
Date de publication:
2020
2020
Historique:
received:
20
01
2020
accepted:
19
05
2020
entrez:
30
6
2020
pubmed:
1
7
2020
medline:
1
7
2020
Statut:
epublish
Résumé
Spiders (Araneae) form abundant and diverse assemblages in agroecosystems such as fruit orchards, and thus might have an important role as natural enemies of orchard pests. Although spiders are polyphagous and opportunistic predators in general, limited information exists on their natural prey at both species and community levels. Thus, the aim of this study was to assess the natural prey (realized trophic niche) of arboreal hunting spiders, their role in trophic webs and their biological control potential with direct observation of predation events in apple orchards. Hunting spiders with prey in their chelicerae were collected in the canopy of apple trees in organic apple orchards in Hungary during the growing seasons between 2013 and 2019 and both spiders and their prey were identified and measured. Among others, the composition of the actual (captured by spiders) and the potential (available in the canopy) prey was compared, trophic niche and food web metrics were calculated, and some morphological, dimensional data of the spider-prey pairs were analyzed. Species-specific differences in prey composition or pest control ability were also discussed. By analyzing a total of 878 prey items captured by spiders, we concluded that arboreal hunting spiders forage selectively and consume a large number of apple pests; however, spiders' beneficial effects are greatly reduced by their high levels of intraguild predation and by a propensity to switch from pests to alternative prey. In this study, arboreal hunting spiders showed negative selectivity for pests, no selectivity for natural enemies and positive selectivity for neutral species. In the trophic web, the dominant hunting spider taxa/groups (
Identifiants
pubmed: 32596048
doi: 10.7717/peerj.9334
pii: 9334
pmc: PMC7307562
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e9334Informations de copyright
© 2020 Mezőfi et al.
Déclaration de conflit d'intérêts
The authors declare that they have no competing interests.
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