• Summary
• Text account
• Data table and detailed info
• Map
• Reference and further resources

The site was identified as important in 2009 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Magpie Goose Anseranas semipalmata	LC	resident	1981-1994	1,600,000 individuals	A4i
Plumed Whistling-duck Dendrocygna eytoni	LC	resident	1981-1994	50,000 individuals	A4i
Wandering Whistling-duck Dendrocygna arcuata	LC	resident	1981-1994	400,000 individuals	A4i
Radjah Shelduck Radjah radjah	LC	resident	1981-1994	20,000 individuals	A4i
Green Pygmy-goose Nettapus pulchellus	LC	resident	1981-1994	50,000 individuals	A4i
Pacific Black Duck Anas superciliosa	LC	resident	1981-1994	60,000 individuals	A4i
Grey Teal Anas gracilis	LC	resident	1981-1994	50,000 individuals	A4i
Brolga Grus rubicunda	LC	resident	1981-1994	24,000 individuals	A4i
Australian Bustard Ardeotis australis	LC	resident	1998-2008	212 individuals	A1
Black-necked Stork Ephippiorhynchus asiaticus	NT	resident	1981-1984	1,800 individuals	A1, A4i
Royal Spoonbill Platalea regia	LC	resident	1981-1994	35,000 individuals	A4i
Australian Ibis Threskiornis moluccus	LC	non-breeding	1981-1994	15,000 individuals	A4i
Straw-necked Ibis Threskiornis spinicollis	LC	resident	1981-1994	80,000 individuals	A4i
Glossy Ibis Plegadis falcinellus	LC	resident	1981-1994	60,000 individuals	A4i
Plumed Egret Ardea plumifera	LC	resident	1981-1994	200,000 individuals	A4i
Pied Heron Egretta picata	LC	breeding	1981-1994	50,000 individuals	A4i
Australian Pelican Pelecanus conspicillatus	LC	resident	1981-1994	50,000 individuals	A4i
Bush Thick-knee Burhinus grallarius	LC	resident	1998-2008	frequent	A1
Black-winged Stilt Himantopus himantopus	LC	resident	1981-1994	100,000 individuals	A4i
Masked Lapwing Vanellus miles	LC	resident	1981-1994	80,000 individuals	A4i
Comb-crested Jacana Irediparra gallinacea	LC	resident	1981-1994	25,000 individuals	A4i
Little Curlew Numenius minutus	LC	non-breeding	1981-1994	300,000 individuals	A4i
Sharp-tailed Sandpiper Calidris acuminata	VU	non-breeding	1990-2002	4,900 individuals	A4i
Australian Pratincole Stiltia isabella	LC	non-breeding	1981-1994	30,000 individuals	A4i
Whiskered Tern Chlidonias hybrida	LC	non-breeding	1981-1994	45,000 individuals	A4i
Northern Rosella Platycercus venustus	LC	resident	1998-2008	uncommon	A3
Varied Lorikeet Psitteuteles versicolor	LC	resident	1998-2008	uncommon	A3
Rainbow Pitta Pitta iris	LC	resident	1998-2008	uncommon	A2, A3
Banded Honeyeater Cissomela pectoralis	LC	resident	1998-2008	uncommon	A3
Silver-crowned Friarbird Philemon argenticeps	LC	resident	1998-2008	uncommon	A3
Bar-breasted Honeyeater Ramsayornis fasciatus	LC	resident	1998-2008	uncommon	A3
White-gaped Honeyeater Stomiopera unicolor	LC	resident	1998-2008	abundant	A3
Buff-sided Robin Poecilodryas cerviniventris	LC	resident	1998-2008	uncommon	A3
Australian Yellow White-eye Zosterops luteus	LC	resident	1998-2008	uncommon	A3
Masked Finch Poephila personata	LC	resident	1998-2008	uncommon	A3
Long-tailed Finch Poephila acuticauda	LC	resident	1998-2008	frequent	A3

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2009) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2009. The most recent assessment (2008) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Climate change and severe weather	likely in long term (beyond 4 years)	some of area/population (10-49%)	slow but significant deterioration	medium
Energy production and mining	happening now	small area/few individuals (<10%)	slow but significant deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation	% overlap with IBA
1979	Kakadu	National Park (Commonwealth)	65
1980	Kakadu National Park	Ramsar Site, Wetland of International Importance	63
1981	Kakadu National Park	World Heritage Site (natural or mixed)	63
1991	Kakadu	National Park	65

Habitat1	Habitat detail	% of IBA
Forest	Melaleuca forests & woodlands, Mangroves	major (>10)
Wetlands (inland)	Riverine floodplains	major (>10)
Marine Intertidal		minor (<10)
Shrubland	Chenopod shrubs, samphire shrubs and forblands	minor (<10)

1. IUCN Habitat classification.

Land use	% of IBA
other	major (>10)
nature conservation and research	major (>10)

Kakadu NP owned by Traditional Owners and managed in partnership with National Parks; wetlands to east owned by Arnhemland ALT.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Alligator Rivers Floodplains (Australia). Downloaded from https://datazone.birdlife.org/site/factsheet/alligator-rivers-floodplains-iba-australia on 22/11/2024.