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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
Weka Gallirallus australis	VU	resident	-	present	A1
Yellow-eyed Penguin Megadyptes antipodes	EN	resident	1932-1990	40-66 breeding pairs	A1, A4ii
Sooty Shearwater Ardenna grisea	NT	breeding	2013	100,000-499,999 breeding pairs	A4ii
Stewart Island Shag Leucocarbo chalconotus	VU	breeding	1911-2011	384-922 breeding pairs	A1, A4i
A4iii Species group - seabirds	n/a	-	-	100,000-499,999 breeding pairs	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
Human intrusions and disturbance	likely in short term (within 4 years)	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

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
1926	Nature Reserve - Bench Island	Nature Reserve	37
1958	Whero Rock	Nature Reserve	<1

Habitat1	Habitat detail	% of IBA
Forest		major (>10)
Marine Coastal/Supratidal		major (>10)
Marine Intertidal		major (>10)
Shrubland		major (>10)

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Northern Titi Muttonbird Islands (New Zealand). Downloaded from https://datazone.birdlife.org/site/factsheet/northern-titi-muttonbird-islands-iba-new-zealand on 22/11/2024.