Leatherback turtle (Dermochelys coriacea) nesting on Rekawa beach: sand compaction and red light?

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What nesting trance indicators and sand temperature monitoring ensure ethical night observation of massive Leatherback turtles without inducing false crawls?

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Accepted Answer

Rekawa Beach in Hambantota is one of the few global nesting sites visited by all five species of marine turtles, including the colossal Leatherback (Dermochelys coriacea). Weighing up to 500kg, nesting females emerge on dark high-tide nights between April and July. Conservation field trackers under the Turtle Conservation Project (TCP) monitor the beach in darkness. Visitors are held back until the turtle finishes digging the 80cm egg chamber and enters the physiological "egg-laying trance." Observers approach strictly from the rear under low-intensity red LED headlamps (650nm), which turtles cannot detect.

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Flash photography and white light torches are prohibited; white light startles the female, causing her to abort egg-laying and return to the ocean.

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In-situ nest temperatures govern sex determination: temperatures above 29.5°C produce female hatchlings, while cooler sand yields males.

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Dr Anouk Marine1890 rep

TCP community protection ensures nests remain safe from feral dogs and poachers, avoiding artificial concrete holding tanks that disorient hatchlings.

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Capt Roshan Sea1720 rep

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