Melatonin does not prevent long photoperiod stimulation of secondary sexual characters in the male three-spined stickleback Gasterosteus aculeatus.

@article{Mayer1997MelatoninDN,
  title={Melatonin does not prevent long photoperiod stimulation of secondary sexual characters in the male three-spined stickleback Gasterosteus aculeatus.},
  author={Irmengard Mayer and Cecilia Bornestaf and Lennart Wetterberg and Bertil Borg},
  journal={General and comparative endocrinology},
  year={1997},
  volume={108 3},
  pages={
          386-94
        }
}
Breeding in the three-spined stickleback is stimulated by long but not by short photoperiods in many seasons. The aim of the present study was to test the hypothesis that melatonin plays a role in the inhibitory effect of short photoperiod in this species. Adult nonbreeding males were kept either under constant light (Experiment 1) or under a stimulatory long photoperiod (16L 8D, Experiment 2), in water containing 0, 20, or 80 microg/liter melatonin for 16 hr/day for 28 days during the spring… CONTINUE READING
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