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Potential pollen vectors of the mass flowering tree Acacia dealbata, within its natural range in southern Tasmania

Citation

Griffin, AR and Hingston, AB and Harwood, CE and Harbard, JL and Brown, MJ and Ellingsen, KM and Young, CM, Potential pollen vectors of the mass flowering tree Acacia dealbata, within its natural range in southern Tasmania, Papers and Proceedings of the Royal Society of Tasmania, 154 pp. 9-26. ISSN 0080-4703 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 the Society

DOI: doi:10.26749/rstpp.154.9

Abstract

In Tasmania, Acacia dealbata flowers from July to September when weather conditions are non-conducive to activity by the insects which are generally considered to be major pollinators of the genus. This paper examines the presence and behaviour of insect and bird visitors as potential pollen vectors. Very few insects were observed to visit the flowers. However, several bird species fed on the flower-heads and foraged for small invertebrates inhabiting the blossoms. These feeding behaviours resulted in adhesion of pollen to feathers likely to be transferred from one genet to another as birds moved. During feeding, rosellas were observed to not only ingest flower-heads but the presence of branchlet clip under 57% of A. dealbata trees surveyed is evidence of the widespread occurrence of these species foraging on flowers. However, given the profusion of flowers and the small numbers of birds observed, it is difficult to conclude that birds are wholly responsible for outcross pollination and we discuss the possibility that wind may also be an important pollen vector. Although the floral attributes of A. dealbata are more aligned with insect pollination, we failed to definitively identify any one major pollinator of the species in this environment and suggest that the pollination syndrome may most accurately be described as generalist.

Item Details

Item Type:Refereed Article
Keywords:Acacia dealbata, pollination syndrome, bird pollination, insect pollination, wind pollination, mass flowering, pollination ecology
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community ecology (excl. invasive species ecology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Rehabilitation or conservation of terrestrial environments
UTAS Author:Griffin, AR (Professor Rod Griffin)
UTAS Author:Hingston, AB (Mr Andrew Hingston)
UTAS Author:Harwood, CE (Mr Christopher Harwood)
UTAS Author:Harbard, JL (Ms Jane Harbard)
UTAS Author:Young, CM (Mrs Catherine Young)
ID Code:143889
Year Published:2020
Deposited By:Plant Science
Deposited On:2021-04-09
Last Modified:2022-04-13
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