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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
Whooper Swan Cygnus cygnus	LC	breeding	2004-2009	1-2 breeding pairs	C6
Spotted Crake Porzana porzana	LC	breeding	2001-2008	5-30 males	C6
Little Crake Zapornia parva	LC	breeding	2009	30-50 males	C6
Common Crane Grus grus	LC	passage	2002-2003	1,000-1,500 individuals	C2
Black-tailed Godwit Limosa limosa	NT	breeding	2004-2008	12-25 breeding pairs	C1
Black-tailed Godwit Limosa limosa	NT	passage	2004-2008	30-130 individuals	C1
Little Tern Sternula albifrons	LC	breeding	2001-2009	8-25 breeding pairs	C6
Whiskered Tern Chlidonias hybrida	LC	breeding	2004-2008	90-180 breeding pairs	C6
Black Tern Chlidonias niger	LC	breeding	2004-2008	10-90 males	C6
Common Tern Sterna hirundo	LC	breeding	2004-2009	60-300 breeding pairs	C6
Aquatic Warbler Acrocephalus paludicola	VU	breeding	2004-2009	10 males	C1
A4iii Species group - waterbirds	n/a	passage	2004-2009	10,000-50,000 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 (2011) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Whooper Swan Cygnus cygnus	1	1	males	100	favourable
Common Crane Grus grus	1,500	1,000	individuals	67	unfavourable
Black-tailed Godwit Limosa limosa	25	3	breeding pairs	12	very unfavourable
Black-headed Gull Larus ridibundus	1,500	315	breeding pairs	21	very unfavourable
Common Tern Sterna hirundo	300	110	breeding pairs	37	very unfavourable

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
1986	Dolina Narwi	Obszar Chronionego Krajobrazu	81

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