Van Oordt's Mersken

IBA Justification

The site was identified as important in 2016 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Ruff Calidris pugnax LC breeding 2011-2015 3-4 breeding pairs C6

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2016).

IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2017 very unfavourable not assessed medium
Was the whole site assessed? State assessed by Accuracy of information
yes population good

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Calidris pugnax Ruff 10 3 breeding pairs 30 very unfavourable

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Whole area of site (>90%) covered by appropriate conservation designation A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species Unknown medium
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Wijnjeterper Schar Site of Community Importance (Habitats Directive) 170 protected area overlaps with site 328
Van Oordts Mersken Natuurbeschermingswet 842 is identical to site 0
Van Oordt's Mersken Special Protection Area (Birds Directive) 842 is identical to site 670
Van Oordt's Mersken Nature Reserve 388 protected area contained by site 388
Van Oordt's Mersken Site of Community Importance (Habitats Directive) 536 protected area contained by site 0


Habitat (IUCN level 1) Habitat detail Extent (% of site)
Wetlands (inland) Rivers and streams -
Artificial/Terrestrial Highly improved re-seeded landscapes -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
water management -
nature conservation and research -
urban/industrial/transport -
agriculture -
hunting -

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Van Oordt's Mersken. Downloaded from on 01/10/2023.