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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
Cape Barren Goose Cereopsis novaehollandiae	LC	resident	1989-2007	473 breeding pairs	A4i
Little Penguin Eudyptula minor	LC	resident	1978-1997	41,000 breeding pairs	A4ii
White-faced Storm-petrel Pelagodroma marina	LC	resident	1978-1997	44,000 breeding pairs	A4ii
Short-tailed Shearwater Ardenna tenuirostris	LC	resident	1975-1995	790,000 breeding pairs	A4ii
Black-faced Cormorant Phalacrocorax fuscescens	LC	resident	1978-1997	336-436 individuals	A4i
Sooty Oystercatcher Haematopus fuliginosus	LC	resident	1978-1997	102 breeding pairs	A4i
Pacific Gull Larus pacificus	LC	resident	1978-1997	229 breeding pairs	A4i
Fairy Tern Sternula nereis	VU	resident	1986	89 breeding pairs	A1, A4i

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
Agricultural expansion and intensification	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Invasive and other problematic species and genes	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Biological resource use	happening now	some of area/population (10-49%)	no or imperceptible deterioration	low
Human intrusions and disturbance	happening now	some of area/population (10-49%)	no or imperceptible 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
-	Little Goose Island Nature Reserve	Nature Reserve	<1
-	Beagle Island Nature Reserve	Nature Reserve	<1
-	Little Badger Island Nature Reserve	Nature Reserve	<1
1999	East Kangaroo Island	Nature Reserve	10
1999	Chappell Islands	Nature Reserve	1
1999	Big Green Island	Nature Reserve	13
1999	Isabella Island	Nature Reserve	1
1999	Goose Island	Conservation Area	5
2000	Badger Island	Indigenous Protected Area	59
2000	Mt Chappell Island	Indigenous Protected Area	15
2000	Chalky Island	Conservation Area	2
2000	Wybalenna Island	Conservation Area	1
2000	Mile Island	Conservation Area	<1
2011	Pasco Group	Conservation Area	2
2011	Marriott Reef	Conservation Area	<1
2013	Little Chalky Island	Conservation Area	<1

Habitat1	Habitat detail	% of IBA
Artificial/Terrestrial	Improved grassland & pasture	major (>10)
Grassland	Tussock grasslands	major (>10)
Shrubland	Chenopod shrubs, samphire shrubs and forblands	minor (<10)
Marine Coastal/Supratidal		-

1. IUCN Habitat classification.

Land use	% of IBA
nature conservation and research	major (>10)
rangeland/pastureland	major (>10)
not utilised	minor (<10)

Tasmanian State Government and private land owners.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Chalky, Big Green and Badger Island Groups (Australia). Downloaded from https://datazone.birdlife.org/site/factsheet/chalky-big-green-and-badger-island-groups-iba-australia on 22/11/2024.