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Management implications of the Macquarie Island trophic cascade revisted: a reply to Dowding et al.(2009)


Bergstrom, D and Lucieer, A and Kiefer, K and Wasley, J and Belbin, L and Pedersen, TK and Chown, C, Management implications of the Macquarie Island trophic cascade revisted: a reply to Dowding et al.(2009), Journal of Applied Ecology, 46, (5) pp. 1133-1136. ISSN 0021-8901 (2009) [Refereed Article]

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DOI: doi:10.1111/j.1365-2664.2009.01708.x


1. The management of non-indigenous species is not without its complications. In Bergstromet al.’s(2009) study, we demonstrated that feral cats Felis catus on sub-Antarctic Macquarie Island were exerting top-downcontrol on the feral rabbit Oryctolagus cuniculus population, and that the eradication of the cats led to a substantial increase in rabbit numbers and an associated trophic cascade. 2. Dowding et al. (2009) claim our modelling was flawed for various reasons, but primarily that a reduction in the application of the rabbit control agent,Myxoma virus, coinciding with cat removal, was a major driver of rabbit population release. 3. We explore this proposition (as well as others) by examining rates of Myxoma viral release between 1991 and 2006 (with an attenuation factor for the years, 2003–2006) in association with presence ⁄ absence of cats against two estimates of rabbit population size. Myxoma viral release was a significant factor in the lower estimates of rabbit population, but the effect was small, and was not significant for higher rabbit population estimates. By contrast, the presence or absence of cats remained highly significant for both estimates. 4. Synthesis and applications. We re-affirm our position that top-down control of rabbit numbers by cats, prior to their eradication, was occurring on Macquarie Island. Nonetheless, we agree with Dowding et al. (2009) that systems with multiple invasive species represent complex situations that require careful scrutiny. Such scrutiny should occur in advance of, during, and following managementinterventions.

Item Details

Item Type:Refereed Article
Keywords:invasive species, rabbits, sub-Antarctic, trophic cascade
Research Division:Environmental Sciences
Research Group:Ecological applications
Research Field:Biosecurity science and invasive species ecology
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Lucieer, A (Professor Arko Lucieer)
UTAS Author:Pedersen, TK (Mr Tore Pedersen)
ID Code:60302
Year Published:2009
Web of Science® Times Cited:14
Deposited By:Geography and Environmental Studies
Deposited On:2010-01-29
Last Modified:2010-04-14
Downloads:1 View Download Statistics

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