Debrot, A.O.

The land cover map of Saba gives a coarse representation of the distribution of forest, shrub, pasture and artificial surface. Invasive species (like Corallita) are included where technically possible. See this report for more information

Quantitative habitat mapping and description form the basis for understanding the provisioning of ecosystem services and habitat connectivity, and hence provide an essential underpinning for marine spatial planning, management and conservation. Based on 869 video stations in a 150 x 200 m grid, we mapped 25.3 km2 of the near-shore island shelf of St. Eustatius at depths ranging 5-30 m. This yielded a coarse-grained map of the principal habitat classes of St. Eustatius’ seascapes. A total of nine principal seafloor habitats were distinguished. Gorgonian reefs amounted to 22% of the Statia Marine Park habitats sampled and were concentrated in the shallow wave-exposed eastern parts of the island (7.7 m average depths). The densest coral “scapes” and seagrass beds of St. Eustatius were concentrated at depths of about 24 m and only amounted to 4 and 5 percent resp. of the island shelf habitats studied. Whereas coral areas were essentially limited to the southern and south-western island shelf areas, seagrass beds were confined to the northern island shelf area. Including patch reef habitats, total hard coral-scape habitat for the St. Eustatius Marine Park amounted to about 19% of the area surveyed and about 475 ha of habitat. Sargassum reef habitat typically occurred at the seaward edge of communities dominated by hard coral growth.

Important Bird and Biodiversity Areas (IBA) map of Bonaire (GIS).

See Bird life international website for program description

Vegetation map of Bonaire, based on aerial photograph interpretation from December 1995 and June 1996, true color, scale approximately 1:8,000 (GIS)

See this report for more info.

See this pdf for a printable version of the original map.

The Lesser Antillean Iguana was originally found in the Lesser Antilles from Anguilla to Martinique, but is rapidly being lost from both large and small islands due to a range of factors.As populations continue to decline, life history information on the species remains very limited. During a population assessment for this species from May to December 2012, we collected data on the causes of mortality and endangerment by interviewing 53 local inhabitants and compiling all cases known to staff and volunteers of the National Parks Foundation.

Our results and observations suggest that on St. Eustatius, the interaction of vegetation and geology limit nest site availability to the iguana. Our results further indicate that the sites presently used are vulnerable to humans and their non-native pets, livestock, and invasive weeds.

In the Dutch Caribbean EEZ, at least 27 elasmobranch species have been documented. Of these, 9 are listed as “critically endangered” and 8 as “near threatened” by the IUCN. Elasmobranchs are not a target fishery in the Dutch Caribbean, but do occur as bycatch in artisanal fisheries. Sharks are considered nuisance species by fishermen. Most sharks caught are not discarded, but consumed locally, used as bait, or (reportedly) killed and discarded at sea on the two islands where landing of sharks is illegal (Bonaire and St. Maarten). Based on recent data, published sport diver accounts, and anecdotal accounts, it is clear that shark populations in most areas of the Dutch Caribbean have been strongly depleted in the last half century.

Abstract:

In 2005 to 2006 we assessed the status of the Caribbean coot Fulica caribaea in the Netherlands Antilles, largely semi-arid islands in the South Caribbean, with small numbers of permanently available fresh water bodies. The Caribbean coot is a freshwater bird which is dependent on the seasonal availability of freshwater ponds for breeding; it breeds on 4 of the 6 islands of the Netherlands Antilles, viz. Curaçao (first recorded in 1956), Bonaire (1974), Aruba (1977), and St. Maarten (1981). Compared to the period up to and including 1979, group sizes in 1980 to 2006 were larger on Curaçao, and it appears more abundant in the latter period on all islands. We report on 49 sites (>5 ha) in the Caribbean where the species has been recorded, or where we would expect it to occur on the basis of available habitat. Threats to the Caribbean coot include drainage or reclamation of habitat, hunting, and pollution. Few sites receive protection. The coot has a restricted range of occupancy of some 1000 km2, spread out over 13 islands, representing 10 countries. Based on its restricted range, coupled with high levels of threat and the limited amount of protection, we recomend that the species be included as ‘Vulnerable’ in the IUCN (International Union for the Conservation of Nature and Natural Resources, World Conservation Union) Red List. An increase in the level of (legal) protection, in addition to an increase in the amount of habitat included in the regional protected areas network and heightening the awareness of the needs of this Caribbean endemic are overdue. The establishment of permanent freshwater ponds, especially in the arid parts of its range, appears favourable for the species, and may aid conservation. 

Abstract:

At least 33 native species of marine mammals have been documented from the Wider Caribbean Region (WCR). For many of these species, the waters of the region serve as primary habitat for critical activities that include feeding, mating and calving. However, relatively little remains known about their biology, life history, distribution and behavior, particularly also around the windward Dutch islands (Saba, St. Eustatius and St. Maarten). In this study we compiled 84 marine mammal records for the waters of these islands, comprising 9 previously published records and 75 new records. A total of eight distinct species are documented, six of which are cetaceans. In comparison to the leeward Dutch islands (Aruba, Curaçao and Bonaire), documented strandings are few. Results suggest that whereas beaked whales and Bryde’s whale are more common around the leeward Dutch islands, humpback whales are more common around the windward Dutch islands. This study concludes that more dedicated efforts are needed to better document and understand cetacean composition, seasonality and use of the both the windward and leeward Dutch Caribbean maritime territories. Such initiatives should help further clarify any potential regional differences as well the underlying causes thereof. Several nations, including the USA, the Dominican Republic and France, have established marine mammal sanctuaries in their Caribbean waters. Declaring the Dutch EEZ as a marine mammal sanctuary would be a valuable contribution to the conservation of marine mammals in the region. 

Abstract:

Records of whale sharks in the Caribbean are relatively sparse. Here we document 24 records of whale sharks (Rhincodon typus Smith 1882) for the Dutch Caribbean, four for the windward islands of Saba, St. Eustatius and St. Maarten, and twenty for the southern Caribbean leeward islands of Aruba, Curaçao and Bonaire. The results suggest a higher abundance of whale sharks in the southern, leeward part of the Dutch Caribbean, likely associated with seasonal upwelling-driven productivity known for the southeastern Caribbean area. A bimodal seasonal pattern as documented for Venezuela was not as pronounced in our findings for the Leeward Dutch Caribbean and whale sharks were recorded in 9 months of the year. In the Windward Dutch Caribbean all (4) records so far were for the winter months of December-February. Most records involved large and solitary animals in contrast to areas elsewhere suspected of being nursery habitat. According to local sources, whale sharks were most often associated with feeding tunas and sea surface swarms of crab megalopae. 

Summary:

This paper is intended as a basis for nature restoration activities using seeds of trees and (larger) shrubs native to Bonaire with the aim of reforestation. It describes the main seed biology issues relevant for species from this region, to facilitate decisions on time and stage of harvesting, safe storage, breaking dormancy and germinating seeds and planting the young trees in the field.

The paper also emphasises that natural process of seedling establishment and succession must be observed in order to be successful. The choice of species and method of protection once planted in nature will prove essential.

The paper ends with stressing that such a reforestation activity needs to be planned far ahead: seeds must be collected from tree species taking care of genetic diversity and their storage potential. Recalcitrant seeds (see paper) must be treated carefully and in a different way.

In Appendix I all knowledge from literature about collection, storage, germination and planting has been collected. Appendix II gives the growth characteristics of a selection of trees.

This report is part of the Wageningen University BO research program (BO-11-011.05-039) and was financed by the Ministry of Economic Affairs (EZ) under project number 4308701034.