Abstract
An annual or seasonal cycle was suggested in the activity of pinealocytes of bats ( Myotis lucifugus and M. sodalis) collected at the same place within the same cave (Bat Cave, Carter Co., Ky.) at six times of the year. Seasonal changes were statistically significant in both pinealocyte nuclear and nucleolar diameters, but the greatest amplitude and consistency of change were in the latter. The annual peak in nucleolar size occurred in March, at about the time of arousal and dispersal from hibernation. The nadir occurred in early fall just before hibernation. The pattern of seasonal changes in pinealocyte activity suggested by nucleolar size is the inverse of that of pituitary LH cells in related species. Experimental evaluation of a possible pineal role during or following spring arousal and dispersal of bats is suggested in the light of recent studies showing a pineal contribution to regulation of the timing of sympatheto-adrenomedullary activity in laboratory rats.
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