Wildlife of
Micronesia, Federated States of

Primary Threats

• Warming seas are increasing mass coral bleaching risk and reducing reef recovery after storms; ocean acidification threatens coral growth. Sea-level rise and wave-driven flooding are eroding low-lying atolls and coastal infrastructure, salinizing freshwater lenses, and pushing communities to harden shorelines-often degrading mangroves and reef flats that would otherwise buffer waves.
• Nearshore reefs and lagoons are heavily relied on for daily protein; intensive harvesting (including night spearfishing and targeting spawning aggregations) can depress reef fish biomass and alter food webs. High demand and cash income needs can drive extraction of high-value species (e.g., groupers, sea cucumbers) and reduce resilience of reefs to bleaching and cyclones.
• Small islands have limited freshwater, arable land, and timber; localized depletion occurs where population density is higher (notably around state centers) and where cash needs increase reliance on natural resources. This includes depletion of inshore invertebrates (trochus, clams, sea cucumbers) and pressure on watershed forests that regulate streamflow and prevent erosion.
• Coastal development, land conversion, and shoreline armoring reduce mangroves and coastal vegetation; upland forest clearing fragments habitat for native birds and bats and increases runoff to lagoons. In some areas, road building and settlement expansion on narrow coastal plains squeeze natural habitats between ridges and reefs.
• Land-based runoff carries sediment and nutrients from roads, agriculture, and construction into reefs, smothering corals and fueling algal blooms. Solid waste management constraints on remote islands lead to open dumping and plastics entering lagoons; localized sewage and wastewater issues around urban centers degrade water quality. In Chuuk Lagoon, legacy WWII wrecks and materials can pose chronic contamination risks in specific sites.
• Non-native plants and animals can outcompete native island species and alter forest structure; invasive ants, rats, and feral cats threaten ground- and tree-nesting birds and other wildlife. Invasives also affect agroforestry systems and can complicate watershed restoration and protected area management on small islands where eradication is logistically difficult.
• Commercial-scale logging is limited compared to larger countries, but localized timber cutting and forest degradation for construction materials and fuelwood can occur, especially near accessible roads and communities. Loss of forest cover increases erosion and sedimentation that directly harms coral reefs and seagrass beds.
• Expansion or intensification of taro patches, agroforestry, and small-scale farming can increase sediment and nutrient runoff when clearing occurs on slopes or near streams. Shifts from traditional mixed agroforestry to more simplified plantings can reduce biodiversity and watershed stability.
• Roads, airports, ports, coastal protection works, and utility corridors can fragment habitats and increase erosion on steep islands. Coastal infrastructure often drives shoreline armoring and dredging/fill in sensitive lagoon and mangrove areas, with knock-on effects on fisheries nurseries.
• Boat traffic, anchoring, and unregulated tourism/recreation can damage corals and disturb wildlife at sensitive sites (e.g., manta ray cleaning stations in Yap, turtle nesting beaches on outer islands). Increased access to remote reefs can also accelerate extraction and disturbance where enforcement is limited.
• Subsistence hunting/harvest of certain birds and bats occurs in some areas; when combined with habitat loss and invasive predators, this can stress local populations. Turtle harvest pressures have historically affected nesting populations, requiring culturally appropriate management and enforcement.
• Most pressure is domestic or regional rather than large-scale international trade, but high-value marine products (e.g., some reef species, sea cucumbers) can enter commercial supply chains. This can rapidly increase harvest intensity beyond sustainable levels when market demand spikes.