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Ahemeral light regimens test the photoperiodic threshold of the european starling(Sturnus vulgaris)

Abstract

Male European starlings(Sturnus vulgaris) were held for three consecutive photoperiod oscillations (ahemeral years) composed of 30-h day lengths, i.e., the “daily” light and dark each lasted three hours longer than under the natural daily photoperiod at latitude 38°N. These starlings had no gonad metamorphosis during the 45 actual months necessary to complete the three ahemeral photoperiod oscillations; nor did subsequent exposure to continuous illumination elicit gonad response. It is concluded that the daily duration of light and darkness (although certainly operant in controlling starling sexual cycles under temperate-zone photoperiod oscillations) is not the critical factor establishing a sexual cycle under the ahemeral regimen. Rather, it appears that this species must experience a daily duration of light of 12 hours or less (a definitive photoperiodic threshold) before photo-induction of a sexual cycle is possible.

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References

  1. BALLARD, P. D. and BIELLIER, H. V. (1975): Effect of photoperiods on feed intake rhythms of domestic fowl. Int. J. Biometeor., 19: 255–266.

  2. COOPER, J. B. and BARNETT, B. D. (1976): Ahemeral photoperiods for chicken hens. Poultry Sci., 55: 1183–1187.

  3. FARNER, D. S. and FOLLETT, B. K. (1966): Light and other environmental factors affecting avian reproduction. J. Anim. Sci., 25: 90–115.

  4. FARNER, D. S. and LEWIS, R. A. (1971): Photoperiodism and reproductive cycles in birds. Photophysiology. Academic Press, New York, 6: 325–370.

  5. HAMNER, W. M. (1963): Diurnal rhythm and photoperiodism in testicular recrudescence of the house finch. Science, 142: 1294–1295.

  6. HAMNER, W. M. and ENRIGHT, J. T. (1967): Relationships between photoperiodism and circadian rhythms of activity in the house finch. J. exp. Biol., 46: 43–61.

  7. LOFTS, B. and MURTON, R. K. (1968): Photoperiodic and physiological adaptations regulating avian breeding cycles and their ecological significance. J. Zool. (Lond.), 155: 327–394.

  8. RISSER, A. C. (1971): A technique for performing laparotomy on small birds. Condor., 73: 376–379.

  9. SCHWAB, R. G. (1971): Circannian testicular periodicity in the European starling in the absence of photoperiodic change. In: Biochronometry. M. Menaker (ed.). Nat. Acad. Sci., Washington, D.C., 428–447.

  10. SCHWAB, R. G. (1978): Unilateral laparotomy as a technique to assay avian gonadal cycles. Condor., 80: 446.

  11. SCHWAB, R. G. and LOTT, D. F. (1969): Testis growth and regression in starlings,(Sturnus vulgaris), as a function of the presence of females. J. exp. Zool., 171: 39–42.

  12. SCHWAB, R. G. and RUTLEDGE, J. T. (1975): Stable daily light regimens as inductive factors of endogenous testicular cycles in the European starling,(Sturnus vulgaris) Int. J. Biometeor., 19: 219–231.

  13. VAN TIENHOVEN, A. and PLANCK, R. J. (1977): The effect of light on avian reproductive activity. Handbook of Physiology. American Physiological Society, Wash., D.C., 79–107.

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Schwab, R.G. Ahemeral light regimens test the photoperiodic threshold of the european starling(Sturnus vulgaris) . Int J Biometeorol 24, 83–88 (1980). https://doi.org/10.1007/BF02245545

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Keywords

  • Plant Physiology
  • Critical Factor
  • Light Regimen
  • Environmental Medicine
  • Continuous Illumination