|Most recent IBA monitoring assessment|
|Year of assessment||Threat score (pressure)||Condition score (state)||Action score (response)|
|2018||very high||not assessed||high|
|For more information about IBA monitoring please click here|
The site is 17 km long and covers 85% of this barrier island in the Wadden Sea, lying between Texel and Terschelling (the village and the main tourist facilities on the east side have been excluded). The western half of the island (Vliehors) is an extensive sandflat (adjacent to the Wadden Sea, site 001). The eastern part consists of an extensive area of both shifting and fixed sand-dunes (the width of which varies from 300 to 1,700 m), forestry plantations, some embanked brackish lagoons (Kroonpolders) and mudflats (Posthuiswad). The western part of the island (Vliehors) is an air-force training area. Other land-uses include scattered houses, recreational facilities, hunting, and groundwater abstraction.
The dunes hold a recently-established breeding colony of Platalea leucorodia. The island also has a large number of Somateria mollissima (2,500 nests) and a large breeding colony of Larus argentatus. The mudflats south of the island are an important feeding area for tens of thousands of waterbirds that have high-tide roosts in the polders and on the Vliehors (count data for this sandflat hardly exist).
BirdLife International (2020) Important Bird Areas factsheet: Duinen Vlieland. Downloaded from http://www.birdlife.org on 27/02/2020.