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The site was identified as internationally important for bird conservation 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 List	Season (year/s of estimate)	Size	IBA criteria
Corncrake Crex crex	LC	breeding (2006–2009)	98–120 males	C1
Eurasian Golden Plover Pluvialis apricaria	LC	passage (2005–2008)	6,000–8,000 birds	C2
Eurasian Curlew Numenius arquata	NT	passage (2005–2008)	750–1,100 birds	C1
Little Tern Sternula albifrons	LC	breeding (2004–2008)	102–119 pairs	C6
Black Tern Chlidonias niger	LC	breeding (1998)	60 pairs	C6
Common Tern Sterna hirundo	LC	breeding (2004–2008)	255–353 pairs	C6
White-tailed Sea-eagle Haliaeetus albicilla	LC	breeding (2007–2008)	15–19 pairs	C6
Barred Warbler Curruca nisoria	LC	breeding (1998–2000)	360 pairs	C6
A4iii Species group - waterbirds	n/a	passage (2004–2009)	20,000 birds	C4

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2010. The most recent assessment (2019) is shown below.

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Energy production and mining	happe­ning now	most of popul­ation/area (50–90%)	rapid decline (>30% over 3 gener­ations)	very high
Transportation and service corridors	likely in short term (<4 years)	whole of popul­ation/area (>90%)	rapid decline (>30% over 3 gener­ations)	very high

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
-	Zespo/l/ Nadwis/lan/skich Parko/w Krajobrazowych	Landscape Park (-)	27
1953	Wielka Kępa	Rezerwat Przyrody (IV)	<1
1953	Wielka Ke/pa [Forest Reserve]	Nature Reserve (-)	<1
1956	Ostrów Panieński	Rezerwat Przyrody (IV)	<1
1956	Linie NR (Peatbog Reserve)	Nature Reserve (-)	-
1958	Las Mariański	Rezerwat Przyrody (IV)	<1
1965	Wiosło Małe	Rezerwat Przyrody (IV)	<1
1968	Las Mątawski	Rezerwat Przyrody (IV)	1
1972	Wiosło Duże	Rezerwat Przyrody (IV)	<1
1987	Kępa Bazarowa	Rezerwat Przyrody (IV)	<1
1993	Zespó Nadwiolañskich Parków Krajobrazowych	Landscape Park (-)	-

Habitat	% of IBA	Habitat detail
Artificial/Terrestrial	38	Other urban and industrial areas
Wetlands (inland)	31	Standing freshwater; Rivers and streams; Water fringe vegetation; Fens, transition mires and springs
Grassland	21	Humid grasslands; Mesophile grasslands
Forest	8	Alluvial and very wet forest
Other	2

Land use	% of IBA
fisheries/aquaculture	25
agriculture	20
urban/industrial/transport	20
not utilised	15
unknown	15
tourism/recreation	5
hunting	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lower Vistula River Valley (Poland). Downloaded from https://datazone.birdlife.org/site/factsheet/lower-vistula-river-valley-iba-poland on 23/12/2024.