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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
Black-billed Gull Larus bulleri	NT	breeding	1985	min 494 nests	A1, A4i

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
Climate change and severe weather	likely in short term (within 4 years)	some of area/population (10-49%)	moderate to rapid deterioration	medium
Human intrusions and disturbance	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Pollution	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Natural system modifications	happening now	some of area/population (10-49%)	slow but significant deterioration	medium

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
1974	Puerua	Government Purpose Reserve	5
1987	Clutha River Mouth	Stewardship Area	<1
1987	Beaumont	Stewardship Area	<1
1987	Clydevale Punt Landing Site	Stewardship Area	-
1987	Gull Island (Clutha River)	Stewardship Area	<1
1987	Clydevale / Clutha River	Stewardship Area	<1
1987	Puerua Wildlife Reserve	Stewardship Area	<1
2000	Birch Island	Stewardship Area	<1

Habitat1	Habitat detail	% of IBA
Introduced vegetation		major (>10)
Shrubland		major (>10)
Wetlands (inland)		major (>10)
Forest		minor (<10)
Marine Coastal/Supratidal		minor (<10)
Marine Intertidal		minor (<10)

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lower Clutha River Mata-Au (New Zealand). Downloaded from https://datazone.birdlife.org/site/factsheet/lower-clutha-river-mata-au-iba-new-zealand on 22/11/2024.