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The site was identified as important in 2010 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
Bean Goose Anser fabalis	LC	passage	2004-2008	29,500 individuals	C3
Mallard Anas platyrhynchos	LC	passage	1995-2003	23,000 individuals	C3
Mediterranean Gull Larus melanocephalus	LC	breeding	2004-2009	3-9 breeding pairs	C6
Common Tern Sterna hirundo	LC	breeding	2008	186 breeding pairs	C6
A4iii Species group - waterbirds	n/a	passage	2004-2008	30,000 individuals	C4

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2010) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2010. The most recent assessment (2008) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Black-headed Gull Larus ridibundus	4,410	4,410	breeding pairs	100	favourable
Mediterranean Gull Larus melanocephalus	9	9	breeding pairs	100	favourable
Common Tern Sterna hirundo	186	186	breeding pairs	100	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Natural system modifications	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Invasive and other problematic species and genes	happening now	whole area/population (>90%)	moderate to rapid deterioration	very high
Biological resource use	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Human intrusions and disturbance	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Residential and commercial development	happening now	some of area/population (10-49%)	no or imperceptible deterioration	low
Pollution	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
Most of site (50-90%) covered (including the most critical parts for important bird species)	No management planning has taken place	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation	% overlap with IBA
1989	Otmuchowsko - Nyski Obszar Chronionego Krajobrazu	Obszar Chronionego Krajobrazu	100
2007	Zbiornik Nyski	Special Protection Area (Birds Directive)	88

Habitat1	Habitat detail	% of IBA
Wetlands (inland)	Standing freshwater, Water fringe vegetation	100

1. IUCN Habitat classification.

Land use	% of IBA
water management	90
tourism/recreation	10

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Nysa reservoir (Poland). Downloaded from https://datazone.birdlife.org/site/factsheet/nysa-reservoir-iba-poland on 22/11/2024.