Chalcid parasitoid community associated with the invading pest Dryocosmus kuriphilus in north-western Italy

Ambra Quacchia, Chiara Ferracini, James A. Nicholls, Enzo Piazza, Matteo A. Saladini, Federica Tota, G. Melika, Alberto Alma

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

1.Biological invasions of exotic species pose a major threat to native biodiversity. Invaders are known to have direct impacts on native species; however, less well studied are the indirect impacts mediated through the integration of invaders into trophically linked communities. 2.A survey of the chalcid wasp parasitoid community attacking the chestnut gallwasp Dryocosmus kuriphilus was carried out over a 5-year period at 26 sites in north-western Italy. More than 415000 galls were collected and more than 10000 parasitoid specimens emerged. Twenty-seven parasitoid species belonging to six families (Eurytomidae, Pteromalidae, Torymidae, Eupelmidae, Ormyridae, Eulophidae) were identified using morphological and molecular methods; seventeen are new records for the parasitoid community associated with D. kuriphilus in Italy. The morphospecies complexes Megastigmus dorsalis, Eupelmus urozonus, E. annulatus, and Eurytoma pistaciae were the dominant species; another six morphospecies were encountered regularly but at low frequency; and 13 species were recorded only occasionally. The attack rate of any individual parasitoid species was low, although the more common species appeared to be increasing their use of this novel host. 3.Biases observed in the sex ratios of parasitoids emerging from D. kuriphilus galls suggest that parasitoid individuals are making life-history decisions to take advantage of the high abundance of this host. Overall, these patterns imply that there is an ongoing transfer of parasitoids between oak and chestnut galls, and hence a high potential for this invading species to have a major impact on native oak gall communities via indirect competition mediated through shared parasitoids.

Original languageEnglish
Pages (from-to)114-123
Number of pages10
JournalInsect Conservation and Diversity
Volume6
Issue number2
DOIs
Publication statusPublished - Mar 2013

Fingerprint

Dryocosmus kuriphilus
galls
parasitoid
Italy
gall
pests
parasitoids
Castanea
Ormyridae
Quercus
Megastigmus
Eupelmus
Eupelmidae
Eurytoma
Torymidae
Eurytomidae
Pteromalidae
Eulophidae
sex ratio
indigenous species

Keywords

  • Biodiversity
  • Chalcidoidea
  • Chestnut gallwasp
  • Dryocosmus kuriphilus
  • Indigenous parasitoids

ASJC Scopus subject areas

  • Insect Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Chalcid parasitoid community associated with the invading pest Dryocosmus kuriphilus in north-western Italy. / Quacchia, Ambra; Ferracini, Chiara; Nicholls, James A.; Piazza, Enzo; Saladini, Matteo A.; Tota, Federica; Melika, G.; Alma, Alberto.

In: Insect Conservation and Diversity, Vol. 6, No. 2, 03.2013, p. 114-123.

Research output: Contribution to journalArticle

Quacchia, Ambra ; Ferracini, Chiara ; Nicholls, James A. ; Piazza, Enzo ; Saladini, Matteo A. ; Tota, Federica ; Melika, G. ; Alma, Alberto. / Chalcid parasitoid community associated with the invading pest Dryocosmus kuriphilus in north-western Italy. In: Insect Conservation and Diversity. 2013 ; Vol. 6, No. 2. pp. 114-123.
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