Identification of significant shorebird areas : thresholds and criteria

Clemens, R. S., Weston, M. A., Haslem, A., Silcocks, A. and Ferris, J. 2010, Identification of significant shorebird areas : thresholds and criteria, Diversity and distribution, vol. 16, no. 2, pp. 229-242.

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Title Identification of significant shorebird areas : thresholds and criteria
Author(s) Clemens, R. S.
Weston, M. A.
Haslem, A.
Silcocks, A.
Ferris, J.
Journal name Diversity and distribution
Volume number 16
Issue number 2
Start page 229
End page 242
Publisher Wiley - Blackwell Publishing
Place of publication Oxford, England
Publication date 2010
ISSN 1366-9516
0305-0270
1472-4642
Keyword(s) criteria
international importance
ramsar listing
shorebirds
thresholds
wetlands
Summary Aim Conservation managers designate significant areas for shorebirds based on imperfect data. Significant wetlands for migratory shorebirds have usually been identified on the basis of whether they exceed certain thresholds, defined either by total abundance (usually 20,000 waterbirds) or percentage of a population (usually 1.0%). We evaluate the performance of existing criteria and determine if lowering thresholds would improve shorebird conservation without adding unreasonable numbers of significant sites.

Location Australia.

Methods We evaluated the best available data, which is used by managers to designate significant areas, to describe the effect of lowering thresholds on the number of significant sites identified and the number of shorebirds these sites support using a range of thresholds in existing criteria. We also investigated factors which may explain interspecific differences evident when lowering thresholds.

Results When the threshold for total abundance was lowered from 20,000 to 2000 shorebirds, an additional 45 shorebird areas, holding 65% more shorebirds, were identified. When thresholds for the percentage of a population criterion were lowered from 1.0 to 0.1%, an additional 86 shorebird areas were identified which held 29% more shorebirds. The proportion of a species population counted within wetlands identified as significant by the application of criteria varied widely between species. The percentage of population criterion always identified a network of areas that included more individuals of each species than the total abundance criterion at all threshold levels tested. The percentage of species populations found in networks of significant areas showed greater increase as thresholds were lowered for species that were abundant, widespread and well represented at existing thresholds.

Main conclusions Our results suggest lowering thresholds will substantially increase the number of shorebirds in identified significant areas. However, some species will remain under-represented, partly because of interspecific differences in distribution and inadequate sampling of some shorebird habitats.
Language eng
Field of Research 050202 Conservation and Biodiversity
Socio Economic Objective 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Blackwell Publishing Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30029479

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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