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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
South Island Oystercatcher Haematopus finschi	LC	non-breeding	2009-2012	24,970-27,010 individuals	A4i
Northern Red-breasted Plover Charadrius aquilonius	LC	resident	2009-2012	16-18 breeding pairs	A1, A4i
Wrybill Anarhynchus frontalis	VU	non-breeding	2009-2012	629-2,478 individuals	A1, A4i
Black-billed Gull Larus bulleri	NT	breeding	2009-2010	244-508 breeding pairs	A1
A4iii Species group - seabirds	n/a	non-breeding	-	20,000-49,999 individuals	A4iii

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
Pollution	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Human intrusions and disturbance	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Natural system modifications	happening now	small area/few individuals (<10%)	moderate to rapid 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
1987	Awhitu	Stewardship Area	<1
1987	Weymouth	Stewardship Area	-
1987	Drury	Stewardship Area	<1
1987	Mangere	Stewardship Area	-

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

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Manukau Harbour (New Zealand). Downloaded from https://datazone.birdlife.org/site/factsheet/manukau-harbour-iba-new-zealand on 22/11/2024.