Wildlife of
Bonaire, Sint Eustatius and Saba

Primary Threats

• Warming seas drive coral bleaching and mortality, while ocean acidification reduces reef-building capacity-undermining the reef structure that protects coasts and supports fisheries and tourism. Stronger storms and shifting rainfall patterns increase sediment runoff pulses (especially on slopes affected by grazing) and physically damage reefs and coastal infrastructure. Sea-level rise threatens low-lying coastal habitats like mangroves and seagrass areas (e.g., Bonaire's Lac Bay) that are critical nurseries for fish and forage areas for turtles.
• Land-based pollution includes inadequately treated sewage/wastewater, septic leakage, and stormwater runoff carrying nutrients and contaminants to reefs-fueling algal growth and reducing coral recovery. Solid waste and marine debris (plastics, fishing line, consumer trash) accumulate along shorelines due to ocean currents and local disposal challenges. On Bonaire and Statia, erosion from degraded lands can increase sedimentation on reefs, reducing light and smothering corals.
• Fishing pressure (including on reef fish and nearshore species) can reduce key herbivores that keep algae in check, weakening reef resilience after bleaching events. Localized depletion can occur near accessible coastal areas and popular sites, while limited enforcement capacity and data constraints make it difficult to fine-tune harvest rules across islands. Bycatch risks affect sea turtles and other protected species in nearshore gear.
• Marine invasive lionfish prey on juvenile reef fish, altering food webs and hampering reef recovery. Terrestrial invasives-especially free-roaming goats, donkeys, and/or cattle-overgraze vegetation, accelerating erosion and sediment delivery to reefs; on Bonaire this issue is closely tied to land degradation and coastal water quality. Feral cats and rats threaten seabirds and endemic reptiles, while invasive plants can outcompete native dry forest and shrubland species.
• Coastal development for housing, tourism facilities, and shoreline infrastructure fragments or degrades critical habitats (mangroves, beaches, dune systems) and can reduce natural coastal buffering. On smaller islands with limited flat land (Saba and Statia), development pressure concentrates in narrow coastal zones, increasing cumulative impacts on adjacent marine habitats. Informal or incremental coastal modifications (small seawalls, beach grooming, land filling) can compound habitat degradation even where large-scale development is limited.
• High visitation at popular dive and snorkel sites can cause direct reef damage (contact, fin kicks, trampling in shallows) and indirect impacts through boat traffic, noise, and shoreline crowding. Disturbance on nesting beaches can affect sea turtles through lighting, beach use, and nearshore activity. On Saba and Statia, hiking and trail use can erode steep slopes and disturb sensitive upland habitats if not well managed.
• Ports, coastal roads, seawalls, and tourism-related facilities increase hardening of shorelines and can alter currents and sediment transport, affecting adjacent reefs and beaches. Expanding energy, water, and waste infrastructure is essential for people but can fragment terrestrial habitats and introduce new disturbance corridors, especially on the limited land area of Saba and Statia.
• Historical and ongoing land-use changes-such as grazing-driven conversion of native vegetation to degraded scrub and increased fire risk-modify watershed function and increase erosion. Alteration of coastal wetlands (drainage, filling, restricted tidal exchange) reduces nursery habitat and water filtration services. Reef condition is further modified by shifts in ecological balance (loss of herbivores, algal dominance) that make the system less coral-driven.
• Chronic pressure on limited freshwater resources can lead to greater reliance on desalination and infrastructure expansions with coastal footprints. Collection or removal of biological resources (e.g., ornamental organisms, shells) is generally regulated but can still occur at small scales and cumulatively affect local populations, particularly in accessible shallow habitats.
• Coral diseases and syndromes (which can intensify with warmer waters and nutrient enrichment) contribute to coral loss and slow recovery after bleaching. Sea turtle health can be affected by degraded water quality and ingestion/entanglement associated with debris, while terrestrial wildlife can be impacted by pathogens spread via invasive mammals and domestic animals.