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Wetland conservation and sustainable use under global change: a tropical Australian case study using magpie geese

Citation

Traill, LW and Bradshaw, CJA and Delean, S and Brook, BW, Wetland conservation and sustainable use under global change: a tropical Australian case study using magpie geese, Ecography: Pattern and Diversity in Ecology, 33, (5) pp. 818-825. ISSN 0906-7590 (2010) [Refereed Article]

Copyright Statement

Copyright 2010 The Authors. Journal compilation Copyright 2010 Ecography

DOI: doi:10.1111/j.1600-0587.2009.06205.x

Abstract

Imminent shifts in environmental parameters due to climatic change might have profound ramifications for wetlands listed under the Ramsar convention. Although the exact mechanisms by which global change will affect these systems are not known, models that simulate component drivers, particularly at a broad spatial scale, can nevertheless allow for more informed conservation decision making. Such general inference is particularly needed for wetlands across the tropics, where less knowledge and fewer resources are available to mitigate the impacts on important conservation sites. Here we develop a case study of wetland loss to sea level rise across tropical north Australia (including Ramsar-listed sites), and link these to a metapopulation model for a keystone endemic waterbird, the magpie goose Anseranas semipalmata. We projected published models on sea level rise through to the year 2400, and found a non-linear trajectory of inundation up to 20 m above present levels. Digital elevation models were used to simulate sea level rise and the spatially differentiated loss of wetland habitat used by geese. Range retraction was linked to decline in ecological carrying capacity, and we coupled wetland-specific habitat loss projections to a spatially explicit demographic metapopulation model. Additionally, we included alternate harvest strategies based on present-day estimates of indigenous and non-indigenous offtake of geese, and examined the synergy between wetland loss and hunting on extinction risk. Our results suggest that Australia's once-abundant and widespread magpie goose will be reduced to a fragmented population of just a few thousand individuals within the next 200300 yr. Harvest could continue for some time, up to a "tipping point" at around 5% loss of current wetland habitat, after which the decline of geese is rapid. Given the inexorable nature of sea level rise, short- to medium-term conservation of waterbirds across Ramsar wetlands must prepare for adaptive wetland management, such as through buffer-placement, and ongoing monitoring of harvest.

Item Details

Item Type:Refereed Article
Keywords:wetland, conservation, magpie goose, case study, Anseranas semipalmata, climate change
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Wildlife and Habitat Management
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Models
Author:Brook, BW (Professor Barry Brook)
ID Code:116067
Year Published:2010
Web of Science® Times Cited:17
Deposited By:Biological Sciences
Deposited On:2017-05-01
Last Modified:2017-11-22
Downloads:0

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