The klinokinetic behaviour of infective Trichonema larvae in light

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Abstract
Trichonema larvae are affected by light of visible wavelengths and there is a klinokinetic response to light intensity, the smallest rates of turning occurring in light of about 300 ft-c, and the rate of turning increasing with increased intensity (900 ft-c). In dim light the vertical migration of larval nematodes would be greatest, which explains in part the large recoveries from grass at dawn and dusk.I thank Professor O. W. Richards, F.R.S., for permission to work at the Imperial College Field Station, and Professor B. G. Peters for help and advice. The work was financed by the Department of Scientific and Industrial Research.