...Trevor J. Rivers; James G. Morin SUMMARY Luminescent signals can be used by animals for a number of purposes, including courtship and defense, sometimes by the same individual. However, the relative costs of producing these different behaviors are largely unknown. In the marine ostracod Photeros...

... consist of repeated trains of secreted bioluminescent pulses in a specific pattern ejected into the water column as courtship signals by male Vargula annecohenae , which are small (<2 mm) myodocopid ostracod crustaceans. Although these animals display in near darkness, we have used image...

... of spontaneous movements: large slow rotations of up to 50° around a transverse axis, and a superimposed 2 Hz tremor with an amplitude of 5 °. 08 09 1989 © 1990 by Company of Biologists 1990 eye eye-movement ostracod deep-sea Clear ocean water attenuates blue light by a factor...