NL026
Krammer-Volkerak This is an IBA in danger! 


Year of compilation: 2000

Site description
A former tidal estuary of the Rhine/Maas river sytem, closed off from the Oosterschelde (028) in 1987. It also adjoins Grevelingen (027) in the west, Haringvliet/Hollands Diep (024/025) in the north, and is linked with the Zoommeer (029) via the Schelde-Rhine river connection (shipping lane to Antwerp). The 20-km long stagnant freshwater lake includes some islets. Hunting is allowed but with restrictions as to quarry species.



Key biodiversity
An important site for breeding Recurvirostra avosetta, Charadrius alexandrinus (max. 184 pairs, 1989) and Sterna albifrons, but numbers are decreasing due to vegetation succession. The best breeding site for Larus melanocephalus in the Netherlands (e.g. 143 pairs in 1993). The mean total number of waterbirds in January exceeds 20,000.



Pressure/threats to key biodiversity
The main problem is nutrient pollution (`Other' threat, above). The bird-species composition outside the breeding season is much affected by the ongoing change from a salt- to a freshwater ecosystem.



Protected areas
National Partial International High3,300 ha of IBA covered by Natural Monument (Krammer- Volkerak I, 3,300 ha). 130 ha of IBA covered by Natural Monument (Krammer-Volkerak II, 130 ha). 295 ha of IBA covered by Nature Reserve (Krammersche Slikken, 295 ha). 15 ha of IBA covered by Nature Reserve (Schorren bij Ooltgensplaat, 15 ha). 4 ha of IBA covered by Nature Reserve (Slikken van de Heen, 4 ha). 193 ha of IBA covered by Nature Reserve (Slikken van de Heen II, 193 ha). 600 ha of IBA covered by Nature Reserve (Slikken van de Heen en Plaat van de Vliet, 600 ha). 12 ha of IBA covered by Nature Reserve (Dintelse Gorzen, 12 ha). 493 ha of IBA covered by Nature Reserve (Dintelse Gorzen II, 493 ha). 420 ha of IBA covered by Nature Reserve (Hellegatsplaten, 420 ha). 18 ha of IBA covered by Nature Reserve (Inlaag 1887, 18 ha). 6,300 ha of IBA covered by Special Protection Area (Krammer-Volkerak, 6,450 ha). 6,300 ha of IBA covered by Ramsar Site (Krammer-Volkerak, 6,450 ha).




Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Krammer-Volkerak. Downloaded from http://www.birdlife.org on 11/07/2020.