To assess the preferences for light intensities and colour on loggerhead and green hatchlings during sea finding.
Type of Study:
Both species oriented towards uv, violet and blue-green light (360, 400 and 500 nm) and the number of hatchlings attracted increased with increasing intensity. When offered dark vs colour at high and low intensity, loggerheads moved towards 360, 400 and 500 nm and away from 560, 580 and 600nm (orange light). Loggerheads only moved towards red 700nm light at high intensities. Green hatchlings didn't respond to 600 and 700 nm at either high or low intensity
Brightest direction models must incorporate a definition for brightness that considers the response of different to different coloured light
Melbourne Beach, Florida, USA
Witherington B. E. & Bjorndal K. A. (1991) Influences of wavelength and intensity on hatchling sea-turtle phototaxis: implications for sea-finding behavior. Copeia 1991, 1060-1069.