Pollination by nectar-foraging pompilid wasps: a new specialized pollination strategy for the Australian flora.
Pompilidae
colour
nectar
orchid
pollination
specialized
Journal
Plant biology (Stuttgart, Germany)
ISSN: 1438-8677
Titre abrégé: Plant Biol (Stuttg)
Pays: England
ID NLM: 101148926
Informations de publication
Date de publication:
Sep 2021
Sep 2021
Historique:
received:
19
12
2020
accepted:
15
04
2021
pubmed:
18
5
2021
medline:
1
9
2021
entrez:
17
5
2021
Statut:
ppublish
Résumé
The Pompilidae is a cosmopolitan and diverse group of wasps, which commonly feed on nectar. However, pollination systems specialized on pompilids have not been documented in detail outside of southern Africa. Here, we studied Caladenia drummondii (Orchidaceae) where, based on floral traits and preliminary field observations, we predicted pollination by sexual deception of male pompilid wasps. Detailed pollinator observations were undertaken using floral baiting experiments at sites spanning 375 km. Following evidence for nectar on some flowers of C. drummondii, the sugar content on the labellum was analysed by GC-MS. Floral spectral reflectance was measured and compared with Caladenia using other pollination strategies. Males of a single species of pompilid wasp (Calopompilus sp.) were the only visitors capable of pollinating C. drummondii. Attempts to feed from the surface of the labellum were frequent and were associated with removal and deposition of pollinia. GC-MS analysis revealed larger quantities of sugar on the labellum than reported in other Caladenia species. While no sexual or courtship behaviour was observed, the zig-zag and circling flight on approach to the flower is suggestive of odour-based attraction. Floral spectral reflectance was similar to sexually deceptive Caladenia. This study represents the first confirmation of a specialized pompilid pollination system outside of Africa. Although pollination occurs during nectar-foraging, long-distance sexual attraction cannot be ruled out as an explanation for the exclusive male visitation. The similarity in floral spectral reflectance to other Caladenia indicates colour may not impose a constraint on the evolution of pollination by pompilids.
Substances chimiques
Plant Nectar
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
702-710Subventions
Organisme : Australian Research Council
ID : DE15010720
Organisme : Australian Research Council
ID : DE160101313
Organisme : Australian Research Council
ID : DP150102762
Informations de copyright
© 2021 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands.
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