Western Polynesian tropical moist forests

The Western Polynesian tropical moist forests is a tropical and subtropical moist broadleaf forests ecoregion located in the Oceania biogeographic realm, covering the Pacific island nations, including Polynesia, Micronesia, and Melanesia, spanning approximately 92.7 km². Classified under the WWF ecoregion code OC0117, this region represents a distinct ecological community shaped by its unique combination of climate, geography, and evolutionary history.

Climate and Vegetation

This ecoregion experiences warm year-round with high annual rainfall, typically exceeding 2,000 mm. The dominant vegetation consists of dense, multi-layered canopy of broadleaf evergreen trees. These conditions create the foundation for the ecological communities found within the Western Polynesian tropical moist forests.

Ecological Significance

These forests are the most biodiverse terrestrial ecosystems on Earth, hosting an extraordinary density of plant and animal species per unit area. Epiphytes, lianas, and a rich understorey characterise the complex vertical structure. The Western Polynesian tropical moist forests contributes to the broader biodiversity patterns of the Oceania realm.

Geographic Distribution

The Western Polynesian tropical moist forests extends across Kiribati and Tuvalu. This geographic range places it within the Oceania realm, one of the eight major biogeographic divisions of the world.

Notable Species

The Western Polynesian tropical moist forests supports a range of wildlife, including Alexandrian laurel (Calophyllum inophyllum), American carpet grass (Axonopus compressus), Arrowleaf sida (Sida rhombifolia), Beauty Of The Night (Mirabilis jalapa), Bermudagrass (Cynodon dactylon), Birdbill Dayflower (Commelina diffusa), Bloodflower (Asclepias curassavica), Browne's blechum (Ruellia blechum), and 42 more species.

Conservation

Like many tropical and subtropical moist broadleaf forests ecosystems, the Western Polynesian tropical moist forests faces threats from deforestation, agricultural expansion, logging, and climate change. Conservation efforts in this ecoregion focus on habitat preservation, sustainable land management, and protecting corridors that connect fragmented habitat patches.