|Location||Virgin Islands (to USA), St. Thomas|
|Central coordinates||64o 52.34' West 18o 18.90' North|
|Year of IBA assessment||2007|
Site description The site is located on the southeastern coast of St. Thomas and includes several mangrove cays (Bovoni Cay, Patricia Cay, Cas Cay) and lagoons (bays) around them. 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 pond shore and overlooks the pond and vicinity. Offshore of both Saba and Flat Cay are modest sized coral reefs. The islands are publicly owned by the territorial government of the U.S. Virgin Islands and legally protected against terrestrial visitors during the seabird nesting season (April - October). Saba Island is vegetated by scrub-thorny brush and introduced guinea grass on the north facing slopes.
Key Biodiversity Observed in summer 2006: Brown Pelican, Magnificent Frigatebird, Little Blue Heron, Snowy Egret, Great Egret, Green Heron, Laughing Gull, Scaly-napped Pigeon, White Crowned Pigeon, Zenaida Dove, Common Ground-Dove, Green-throated Carib, Gray Kingbird, Yellow Warbler, Bananaquit, Lesser Antillean Bullfinch.
Non-bird biodiversity: Marine sponges, sting rays, small schools of fish, and an occasional barracuda or shark occupy the surrounding waters. There is a small cove at one outlet (“false outlet”) of the lagoon that has a good diversity of littoral sea life.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Green-throated Carib Eulampis holosericeus||resident||2006||unknown||-||A2||Least Concern|
|Antillean Crested Hummingbird Orthorhyncus cristatus||resident||2006||unknown||-||A2||Least Concern|
|Pearly-eyed Thrasher Margarops fuscatus||resident||2006||unknown||-||A2||Least Concern|
|Loxigilla noctis||resident||2006||unknown||-||A2||Not Recognised|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Cas Cay/Mangrove Lagoon||Marine Reserve and Wildlife Sanctuary||0||is identical to site||225|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Shrubland||Arid lowland scrub||minor|
|Land-use||Extent (% of site)|
Protection status Mangrove Lagoon and cays are protected habitats by the USVI Dept. of Planning and Natural Resources (DPNR) with restricted boat dockage and moorings. Access to the lagoons is open but limited to visitors with boats, kayaks, etc.
Acknowledgements Jim Corven
References Boulon, Ralf H. & D. M. Griffin (1999);McLaughlin, M.(Eds)(1976); Platenberg et al. (2005) and Raffaele (1989).
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Recommended citation BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Mangrove Lagoon. Downloaded from http://www.birdlife.org on 28/10/2016
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