|Location||Australia, Western Australia|
|Central coordinates||114o 28.47' East 22o 13.16' South|
|IBA criteria||A2, A4i|
|Altitude||0 - 5m|
|Year of IBA assessment||2008|
Summary The mangroves along the east of Exmouth Gulf have supported more then 1% of the global population of Grey-tailed Tattler and Pied Oystercatcher and also support a population of the restricted-range Dusky Gerygone.
Ornithological information Other high counts of shorebirds include Bar-tailed Godwit (1253), Red-necked Stint (1133) and Greater Sand Plover (1036). Australian Yellow White-eye are very common and widespread (Biota Environmental Sciences 2005).
Site description The Exmouth Gulf Mangroves IBA is located on the eastern side of Exmouth Gulf in northern Western Australia. The IBA is defined by the EPA's Mangrove Mangement Unit (or Benthic Primary Producer Habitat unit), and extends for about 70 km from Giralia Bay to Tubridgi Point. The western boundary of the IBA approximates to the low tide level and the eastern boundary approximates to the inland extent of mangroves. Mudflats are typically 1 km wide but up to 4 km wide at Giralia Bay, and the mangroves are mostly 1 km wide. The shorebirds of this area are poorly known and further surveys may refine the IBA boundary; however it appears that mangroves are much richer along the eastern side of the gulf, which is sheltered and has some rainwater inflows. The mean rainfall at Onslow is 265 mm. Inland of the IBA are bare hypersaline flats, which support some shorebirds roosting at high tides but are otherwise of little value for the key bird species. A nomination for World Heritage listing for Cape Range and Exmouth Gulf is being advanced by the Western Australian government.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Pied Oystercatcher Haematopus longirostris||unknown||2005||196 individuals||-||A4i||Least Concern|
|Grey-tailed Tattler Heteroscelus brevipes||non-breeding||2005||3,184 individuals||-||A4i||Least Concern|
|Dusky Gerygone Gerygone tenebrosa||resident||2005||common [units unknown]||-||A2||Least Concern|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Burnside And Simpson Island||Nature Reserve||115||protected area contained by site||115|
|Tent Island||Nature Reserve||2,015||protected area contained by site||2,015|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Coastline||Intertidal mud, sand & salt flats; Mangrove wetlands||major|
Land ownership Crown Land, private (= Yanrey Station pastoral lease), state government (Giralia Station and the two nature reserves managed by Department of Environment and Conservation).
|Land-use||Extent (% of site)|
|Notes: IBA largely not utilised but activities in surrounding areas include commercial and recreational fisheries, aquaculture, defence training and a proposed salt evaporation works (Biota Environmental Sciences 2006).|
Other biodiversity The site is one of the major population centres for Dugong in WA.
Management considerations Further surveys are needed to investigate the real importance of Exmouth Gulf for shorebirds. Development proposals must not impact the rainwater inflow to the mangroves.
Protection status Burnside and Simpson Island Nature Reserve and Tent Island Nature Reserve.
Acknowledgements Mike Bamford kindly provided advice.
References Biota Environmental Sciences Pty Ltd (2005) Yannarie Salt Project Mangrove and Coastal Ecosystem Study, North Perth, Western Australia.
Biota Environmental Sciences Pty Ltd (2006) Yannarie Salt Project Mangrove and Coastal Ecosystem Study - Executive Summary, North Perth, Western Australia.
Marine Parks and Reserves Selection Working Group (1994) A Representative Marine Reserve System for Western Australia. Department of Conservation and Land Management, Perth.
DEWHA (2008) A Directory of Important Wetlands in Australia. Exmouth Gulf East - WA007. Accessed June 2008.
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Exmouth Gulf Mangroves. Downloaded from http://www.birdlife.org on 24/05/2013
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