Sri Lanka lowland rain forests

The Sri Lanka lowland rain 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 12,500 km². Classified under the WWF ecoregion code IM0154, 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 Sri Lanka lowland rain 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 Sri Lanka lowland rain forests contributes to the broader biodiversity patterns of the Indomalaya realm.

Geographic Distribution

The Sri Lanka lowland rain forests extends entirely within Sri Lanka. This geographic range places it within the Indomalaya realm, one of the eight major biogeographic divisions of the world.

Notable Species

The Sri Lanka lowland rain forests supports a range of wildlife, including Achicoria azul (Launaea intybacea), Alexandrian laurel (Calophyllum inophyllum), Asiatic elephant (Elephas maximus), banana poka (Passiflora tarminiana), Bermudagrass (Cynodon dactylon), Black mimosa (Mimosa pigra), Brown Rat (Rattus norvegicus), Buff tailed bumblebee (Bombus terrestris), and 42 more species. Among these, 1 species is classified as threatened on the IUCN Red List, underscoring the conservation importance of this ecoregion.

Conservation

Like many tropical and subtropical moist broadleaf forests ecosystems, the Sri Lanka lowland rain 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.