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The site was identified as important in 2014 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
Australasian Bittern Botaurus poiciloptilus	VU	resident	-	present	A1
Stewart Island Shag Leucocarbo chalconotus	VU	breeding	1991-2011	min 65 nests	A1, A4i
Southern Red-breasted Plover Charadrius obscurus	CR	non-breeding	-	present	A1
Black-billed Gull Larus bulleri	NT	breeding	-	present	A1
Black-fronted Tern Chlidonias albostriatus	EN	breeding	-	present	A1

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2014) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2014. The most recent assessment (2014) 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	some of area/population (10-49%)	moderate to rapid deterioration	high
Residential and commercial development	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	happening now	small area/few individuals (<10%)	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
1909	Otatara South	Scenic Reserve	<1
1909	Otatara South	Scenic Reserve	<1
1987	Mokomoko Inlet	Stewardship Area	2
1987	Oreti River	Stewardship Area	<1
1987	Bushy Point	Stewardship Area	1
1987	Omaui Island	Stewardship Area	<1

Habitat1	Habitat detail	% of IBA
Introduced vegetation		major (>10)
Marine Coastal/Supratidal		major (>10)
Marine Intertidal		major (>10)
Marine Neritic		major (>10)
Shrubland		major (>10)
Artificial/Aquatic & Marine		minor (<10)
Forest		minor (<10)

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Omaui Island Oreti Estuary (New Zealand). Downloaded from https://datazone.birdlife.org/site/factsheet/omaui-island-oreti-estuary-iba-new-zealand on 22/11/2024.