Endemic Sri Lankan freshwater crab (Ceylonthelphusa) conservation in wet zone boulder brooks?
What micro-habitat conditions within damp cloud-forest leaf litter sustain endangered highland mountain crabs in the Knuckles and Sinharaja ranges?
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3 Answers from travellers
Sri Lanka possesses remarkable endemic freshwater crab diversity, with over 50 species in the family Gecarcinucidae (including genera Ceylonthelphusa, Perbrinckia, and Mahatha). These mountain crabs are fully adapted to freshwater mountain environments, omitting free-swimming larval stages; females brood eggs directly under the abdomen, releasing fully formed crablets into damp moss. They inhabit clean, fast-flowing mountain torrents and humid leaf litter under dense rainforest canopy at elevations up to 2,000 meters. They require high water oxygen levels and cannot survive in streams polluted by synthetic agricultural fertilizers or cardamom drying kilns.
Turning over wet forest boulders to find crabs risks crushing small juveniles; field surveys should replace stones back in their original resting beds.
Micro-habitat desiccation caused by logging and climate warming along mountain ridges presents the largest extinction risk to mountain stream invertebrates.
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