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Habitat provided by native species facilitates higher abundances of an invader in its introduced compared to native range

Citation

Gribben, PE and Poore, AGB and Thomsen, MS and Quesey, P and Weschke, E and Wright, JT, Habitat provided by native species facilitates higher abundances of an invader in its introduced compared to native range, Scientific Reports, 10, (1) Article 6385. ISSN 2045-2322 (2020) [Refereed Article]


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Copyright 2020 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/s41598-020-63429-2

Abstract

The impacts invasive species have on biodiversity and ecosystem function globally have been linked to the higher abundances they often obtain in their introduced compared to native ranges. Higher abundances of invaders in the introduced range are often explained by a reduction in negative species interactions in that range, although results are equivocal. The role of positive interactions in explaining differences in  the abundance of invaders between native and invasive ranges has not been tested. Using biogeographic surveys, we showed that the rocky shore porcelain crab, Petrolisthes elongatus, was ~4 times more abundant in its introduced (Tasmania, Australia) compared to its native (New Zealand) range. The habitat of these crabs in the invaded range (underside of intertidal boulders) was extensively covered with the habitat-forming tubeworm Galeolaria caespitosa. We tested whether the habitat provided by the tubeworm facilitates a higher abundance of the invasive crab by creating mimics of boulders with and without the tubeworm physical structure and measured crab colonisation into these habitats at three sites in both Tasmania and New Zealand. Adding the tubeworm structure increased crab abundance by an average of 85% across all sites in both ranges. Our intercontinental biogeographic survey and experiment demonstrate that native species can facilitate invader abundance and that positive interactions can be important drivers of invasion success.

Item Details

Item Type:Refereed Article
Keywords:biological invasion, facilitation, intertidal boulder field, Petrolisthes elongatus, positive interactions
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community ecology (excl. invasive species ecology)
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Control of pests, diseases and exotic species in coastal and estuarine environments
UTAS Author:Wright, JT (Associate Professor Jeffrey Wright)
ID Code:143174
Year Published:2020
Deposited By:Ecology and Biodiversity
Deposited On:2021-03-03
Last Modified:2021-04-19
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