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Location Bonaire, Sint Eustatius and Saba (to Netherlands), Sint Eustatius
Central coordinates 62o 59.60' West  17o 30.52' North
IBA criteria A2, A4ii
Area 1,016 ha
Altitude 0 - 300m
Year of IBA assessment 2009

Site description The Boven Subsector is a legally protected area comprising several xeric, rocky hills in the northwest peninsula of St. Eustatius, or Statia. Zeelandia beach is on the southeast end of the area, which harbors Tropicbird nesting areas in its sandy cliffs. The hills above the airport form the southern limit of the concentration of Tropicbird nesting.There are no settlements within Boven; however, an oil transfer station lies on the western border along the coast.

Key Biodiversity A significant population of Red-billed Tropicbirds, Phaethon aethereus, nests within the Boven Subsector, meeting the requirements of A4(i) for a biogeographic population within the Caribbean. An estimate of 100-200 breeding birds was made in 2003 based on field surveys which did not cover all of Boven.

Non-bird biodiversity: Species with restricted ranges include the Antillean Iguana Iguana delicatissima, the ground lizard Ameiva erythrocephala, two anolis lizards Anolis bimaculatus and A. wattsi, and two geckos Sphaerodactylus sputator and S. sabanus. There are five species of bats, the only native mammal, including Ardops nichollsi montserratensis which has a restricted range. Locations for the aforementioned species could not be referenced. The endemic Statia Morning Glory Ipomoea sphenophylla can be found within Boven.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Red-billed Tropicbird Phaethon aethereus breeding  2009  146 individuals  medium  A4ii  Least Concern 
Green-throated Carib Eulampis holosericeus resident  2003  unknown  A2  Least Concern 
Caribbean Elaenia Elaenia martinica resident  2003  unknown  A2  Least Concern 
Pearly-eyed Thrasher Margarops fuscatus resident  2003  unknown  A2  Least Concern 
Loxigilla noctis resident  2003  unknown  A2  Not Recognised 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
St. Eustatius (Statia) Marine Park 2,750 protected area overlaps with site 0  
The Quill / Boven National Park National Park 540 protected area contained by site 540  


IUCN habitat Habitat detail Extent (% of site)
Coastline   25%

Land use

Land-use Extent (% of site)
rangeland/pastureland -

Protection status The Boven Subsector is a protected area. The other protected area is the Quill but it is located at the opposite end of the island. Marine protected areas surround Statia.

Further web sources of information 

Site profile from Important Bird Areas in the Caribbean: key sites for conservation (BirdLife International 2008)

References Collier N.C. and A.C. Brown. 2003. Report to St. Eustatius National Parks: Surveys of Sea and Terrestrial Birds. Unpublished Report. Environmental Protection in the Caribbean, Florida, USA.Hoogerwerf, A. 1977. Notes on the birds of St. Martin, Saba, and St. Eustatius. Studies on the Fauna of Curacao and other caribbean islands 54(176):60-123.Raffaele, H., J. Wiley, O. Garrido, A. Keith, and J. Raffaele. 1998. A guide to the birds of the West Indies. Princeton University Press, Princeton, NJ.Rojer, A. 1997b. Biological Inventory of Sint Eustatius. Unpublished Report. Carmabi Foundation. Curaçao, Netherlands Antilles.Stuffers, A.L. 1956. The vegetation of the Netherlands Antilles. Studies of the Flora of Curaçao and Other Caribbean Islands 1(15).Van Halewyn, R. and R.L. Norton. 1984. The status and conservation of seabirds in the Caribbean. Pp 169-222 in Status and conservation of the world's seabirds (J.P. Croxall, P.G.H. Evans, and R. Schreiber, Eds.). ICBP Technical Pub. No. 2.Cambridge, United Kingdom.Voous, K. H. 1955.The birds of the Netherlands Antilles. Curaçao: Uitg. Natuurwet. Werkgroep Ned. Ant.Voous, K. H. 1983. Birds of the Netherlands Antilles. 2nd ed. De Walburg Pers, Zutphen, Netherlands.Walsh-McGehee M. 2000. Status and Conservation Priorities for White-tailed and Red-billed Tropicbirds in the West Indies. Pages 31-38 in Status and Conservation of West Indian Seabirds (E.A. Schreiber and D.S. Lee, eds.). Society of Caribbean Ornithology, Special Publication No. 1, Ruston, LA.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Boven, Sint Eustatius. Downloaded from on 24/10/2016

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