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The site was identified as internationally important for bird conservation 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 List	Season (year/s of estimate)	Size	IBA criteria
South Island Oystercatcher Haematopus finschi	LC	non-breeding (2009–2012)	24,970–27,010 birds	A4i
Northern Red-breasted Plover Charadrius aquilonius	LC	resident (2009–2012)	16–18 pairs	A1, A4i
Wrybill Anarhynchus frontalis	VU	non-breeding (2009–2012)	629–2,478 birds	A1, A4i
Black-billed Gull Larus bulleri	NT	breeding (2009–2010)	244–508 pairs	A1
A4iii Species group - seabirds	n/a	non-breeding (-)	20,000-49,999 birds	A4iii

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
Pollution	happe­ning now	most of popul­ation/area (50–90%)	slow decline (1–10% over 3 gener­ations)	high
Invasive and other problematic species and genes	happe­ning now	some of popul­ation/area (10–49%)	moderate decline (10–30% over 3 gener­ations)	high
Human intrusions and disturbance	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Natural system modifications	happe­ning now	few indivi­duals/small area (<10%)	moderate decline (10–30% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation (management category)	% coverage of IBA
1987	Awhitu	Stewardship Area (III)	<1
1987	Mangere	Stewardship Area (III)	-
1987	Drury	Stewardship Area (III)	<1
1987	Weymouth	Stewardship Area (III)	-

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

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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 23/12/2024.