Mugger vs Saltwater crocodile ecology in Nilwala River: salinity tolerance and human conflict?
What morphological cranial features and salinity excretion glands separate Crocodylus porosus from Crocodylus palustris in the lower reaches of Matara?
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6 Answers from travellers
The Nilwala River in Matara is a critical sympatric zone where two distinct crocodilians overlap. The Saltwater Crocodile (Crocodylus porosus / Geta Kimbula) dominates the brackish river mouth and estuarine mangrove swamps. It possesses specialized lingual salt glands on its tongue that excrete excess sodium chloride, along with a narrower, triangular snout with distinct preorbital ridges. The freshwater Mugger Crocodile (Crocodylus palustris / Hela Kimbula) inhabits upstream pools and reservoirs; it has a broad, blunt, shovel-shaped snout and lacks functional lingual salt glands. Due to slaughterhouse waste dumping and riverbank encroachment, saltwater crocs in the lower river present severe human-wildlife conflict.
Local bathing ghats install steel-caged "croc fences" (Kimbul Kotu) along riverbanks so residents can bathe in river water safely without ambush risks.
Saltwater crocodiles frequently navigate coastal sea waters to move between southern river mouths, occasionally surfacing off Mirissa and Polhena beaches.
Muggers dig extensive subterranean burrows in mud banks to estivate during severe dry-season drought periods when upper streams dry into trickles.
Nesting occurs between January and April; females construct elevated mounds of decaying leaf vegetation along riverbank thickets to incubate 30 to 50 eggs.
Night boat safaris along the Nilwala use yellow searchlights to identify resting crocs by their brilliant ruby-red tapetal eye reflections on water surfaces.
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