Wormer- en Jisperveld & Kalverpolder (1248)
Netherlands, Europe
Site overview
KBA status: confirmed
Year of last assessment: 2016
National site name: Wormer- en Jisperveld & Kalverpolder
Central coordinates: Latitude: 52.5167, Longitude: 4.8333
System: freshwater, terrestrial
Elevation (m): -2 to -1
Area of KBA (km2): 17.43121
Protected area coverage (%): 100.00
KBA classification: Regional
Legacy site: Yes
Site details
Site description: A polder landscape including a shallow lake, ditches, wet meadows and marshland, situated to the north of the city of Zaandam. This site, together with sites 068, 071 and 072, formed part of a single, larger site (former site NL038) in the previous pan-European IBA inventory (Grimmett and Jones 1989).
Rationale for qualifying as KBA: This site qualifies as a Key Biodiversity Area of international significance that was identified using previously established criteria and thresholds for the identification of Important Bird and Biodiversity Areas (IBAs) and for which available data indicate that it does not meet global KBA criteria and thresholds set out in the Global Standard.
Delineation rationale: 9 March 2017: name and area edited. Now equal to the designated Special Protection Area (Birds Directive).
Habitats
Land use: agriculture (25%) | fisheries/aquaculture (10%) | hunting (10%) | nature conservation and research (32%) | tourism/recreation (11%) | water management (100%)
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Artificial - Terrestrial | 83 | |
| Wetlands(Inland) | 17 |
Threats
Summary of threats to biodiversity at KBA: The main problems are the nutrient pollution of wetlands (`Other' threat, above), disturbance caused by ultra-light planes, and the effects of urbanization. A compensation scheme is in place for those farmers affected by restrictions on agricultural practices.
| Threat level 1 | Threat level 2 | Threat level 3 | Timing |
|---|---|---|---|
| Natural system modifications | Dams & water management/use | Abstraction of ground water (agricultural use) | Ongoing |
| Agriculture & aquaculture | Livestock farming & ranching | Agro-industry grazing, ranching or farming | Ongoing |
| Natural system modifications | Other ecosystem modifications | Ongoing |