Saba Island and Cays (20736)
Virgin Islands (to USA), Caribbean
Site overview
KBA status: confirmed
Year of last assessment: 2009
National site name: Saba Island and Cays
Central coordinates: Latitude: 18.3057, Longitude: -65.0000
System: marine, terrestrial
Elevation (m): 0 to 80
Area of KBA (km2): 5.02885
Protected area coverage (%): 2.52
KBA classification: Regional
Legacy site: Yes
Site details
Site description: The site is located just off the south central coast of St. Thomas and includes Saba Island plus the smaller Turtledove Cay and Flat Cays, a total area of approximately 14 hectares. The islands are about 2 km S-SW of the western end of the Cyril King airport runway extension. Saba has 2 salt ponds (east and west) with coral rubble shoreline on the northern side and rocky cliffs on the seaward south. The Saba terrain rises to about 80 m while the other cays have very low and flat terrain. A shallow sandbar reaches north to Turtledove Cay. There is a protected cove on the northwestern side of Saba with a small sandy beach. Behind the beach is a relative open, flat area adjacent to the west pond. A nature trail was developed some years ago but has mostly grown over. A bird observation blind is located near the east pond shore and overlooks the pond and vicinity. Offshore of both Saba and Flat Cay are modest sized coral reefs.
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.
Additional biodiversity: Islands & surrounding waters Audubon’s Shearwater, Red-billed Tropicbird, White-tailed Tropicbird, Brown Pelican, Brown Booby, Magnificent Frigatebird, White-cheeked Pintail, Lesser Yellowlegs, Laughing Gull, Sandwich Tern, Royal Tern, Roseate Tern, Sooty Tern, Bridled Tern, Brown Noddy, Zenaida Dove, American Oystercatcher, Black-necked Stilt, Smooth-billed Ani, Yellow Warbler. Non-bird biodiversity: The crested anole, Puerto Rican Racer snake, Slipperyback skink, dwarf gecko, and house mouse are also present. Green and Hawksbill Sea Turtles are common in the surrounding waters. There are small coral reef areas in adjacent waters that warrant protection from boat anchoring and terrestrial runoff. Seagrass beds provide habitat for fish, vital for the seabirds.
Delineation rationale: Mark has the shapefiles.
Habitats
Summary of habitats in KBA: Shorelines One beach on Saba is mostly sandy that leads out into some corals on the west. Offshore moorings are available on the leeward sides for day visitors to swim and snorkel the coral areas. Saba island is vegetated by scrub-thorny brush (crab bush, nicker bean) and introduced guinea grass on the north facing slopes, which provides degraded nesting habitat for Sooty Terns. The southern coast is characterized by steep rocky cliffs with suitable nesting habitat for Brown Noddies, Roseate Terns and Tropicbirds. On the leeward side is a dry forest slope. Turtledove and Flat Cays are composed primarily of low vegetation dominated by grasses, sedges and vines. Salt Ponds The two salt ponds on Saba less than 2-3 hectares each with shallow water. Dense shoreline vegetation provides close cover and limits human access. Detailed bird use of the ponds in unknown but only occasional foraging by shorebirds has been observed.
Land use: nature conservation and research | tourism/recreation
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Shrubland | 40 | |
| Marine Coastal/Supratidal | 20 | |
| Marine Neritic | 20 | |
| Marine Intertidal | 20 |
Threats
Summary of threats to biodiversity at KBA: The site is publicly owned by the Territorial government and subject to management and protection by the DPNR. Current use is very limited to diving/snorkeling the coral areas and occasional visitors to the beach. There has been an attempt to develop a birding/nature trail and observation blind but that activity has been abandoned. The municipal sewage outfall that extends southward from the vicinity of the airport releases waste that can flow towards the island, cays, and coral reefs. Saba Island and the cays are fully exposed to the sea to the south and east so there is a natural threat from tropical storms that could damage the coastline and salt ponds. The threat of establishment of exotic plants and animals to the cays is ever present. Boats may run aground during storms, potentially introducing rats. At least one large sailboat has been marooned and abandoned on the shore of Saba Cay causing concern about leaking fuels and oil onto the beach.
Additional information
Contributors: Jim Corven and Judy Pierce