Tonle Sap freshwater swamp forests

The Tonle Sap freshwater swamp forests is a tropical and subtropical moist broadleaf forests ecoregion located in the Indomalaya biogeographic realm, covering South and Southeast Asia, extending from the Indian subcontinent to southern China, spanning approximately 25,926 km². Classified under the WWF ecoregion code IM0164, 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 Tonle Sap freshwater swamp 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 Tonle Sap freshwater swamp forests contributes to the broader biodiversity patterns of the Indomalaya realm.

Geographic Distribution

The Tonle Sap freshwater swamp forests extends across Cambodia and Vietnam. This geographic range places it within the Indomalaya realm, one of the eight major biogeographic divisions of the world.

Notable Species

The Tonle Sap freshwater swamp forests supports a range of wildlife, including Allspice (Pimenta dioica), American Black Nightshade (Solanum americanum), American carpet grass (Axonopus compressus), Anil de pasto (Indigofera suffruticosa), Aroma (Dichrostachys cinerea), Arrowleaf sida (Sida rhombifolia), Awnless Barnyard Grass (Echinochloa colonum), Bermudagrass (Cynodon dactylon), and 42 more species.

Conservation

Like many tropical and subtropical moist broadleaf forests ecosystems, the Tonle Sap freshwater swamp 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.