Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/27768
Title: Ficus rubiginosa, fruitset data and wasp and seed data
Contributor(s): Mackay, K David  (author)orcid 
Publication Date: 2019
DOI: 10.25952/5dcf9ec2e6b47Open Access Link
Handle Link: https://hdl.handle.net/1959.11/27768
Abstract/Context: Aim: We tested four hypotheses: (1) that pioneer trees at distribution margins would receive fewer visits from pollinators and pollinator parasitoids than would trees in larger, established populations; (2) that predator release (lower rates of pollinator parasitism) would result in higher pollinator reproductive success; (3) that less competition among fewer pollinator foundresses would correlate with higher plant reproductive success; and (4) that these effects would be greater at the plant species’ expanding range margin. Location: The dry, western side of the Great Dividing Range in northern New South Wales, eastern Australia. Taxon: The rusty fig (Ficus rubiginosa, Moraceae), its pollinator and the pollinator’s parasitoids. Methods: We measured fruit (syconia) set per tree, seed set per syconium, and fig-wasp numbers (pollinators and non-pollinators) per syconium in a total of 62 trees in 24 populations covering three distributional zones - the dry, western margin of the species’ range, a more mesic, eastern margin at the species’ altitudinal limit, and the zone between these two margins. These results were modelled against F. rubiginosa population size, the position of plant populations in relation to range margins, and climatic gradients of temperature and rainfall. Results: Lower rates of pollinator parasitism and less pollinator competition correlated with increased reproductive success in the pollinator and increased male fitness (in terms of pollen dispersal) and female fitness (in terms of seed per syconium) in isolated trees of F. rubiginosa, compared with trees in larger populations, particularly at F. rubiginosa’s mesic, expanding range margin. Main conclusions: Pollinator-predator release and pollinator-competition release can lead to increased pollinator and plant reproductive success in pioneer trees at range margins. This reinforces the need to understand biotic interactions underlying reproduction and dispersal at expanding range fronts if we are to understand and better predict the drivers and effects of climate-change-induced range shifts in plants and their pollinators.
Publication Type: Dataset
Field of Research (FOR): 050202 Conservation and Biodiversity
Socio-Economic Outcome Codes: 960505 Ecosystem Assessment and Management of Forest and Woodlands Environments
Keywords: figs
pollinators
parasitoids
range margins
range expansion
climate change
HERDC Category Description: X Dataset
Dataset Stored at: University of New England
Appears in Collections:Dataset
School of Environmental and Rural Science

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