Effect of photoperiod on the gonadal cycle in an equatorial bird, quelea quelea

ABSTRACT ROWAN'S1 discovery that increasing day-lengths in winter induce reproductive activity and migratory behaviour has been amply confirmed for many species and has contributed

greatly to our understanding of the timing of these events in birds of the north temperate zone2. There still remain, however, the problems of regulation of migration in species that winter

in the tropics and south temperate zone and regulation of breeding in species that are permanent residents in the tropics. The great dissimilarities in day-length conditions in these zones,

and particularly the relative constancy of day-length in the equatorial region, have raised considerable doubt about a possible regulatory function of day-length in equatorial and

transequatorial migrants and in tropical species. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS OPTIONS

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institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS DAY LENGTH REGULATES GONADOTROPE PROLIFERATION AND REPRODUCTION VIA AN

INTRA-PITUITARY PATHWAY IN THE MODEL VERTEBRATE _ORYZIAS LATIPES_ Article Open access 30 March 2024 NIGHT FLIGHT FACILITATES LATE BREEDING CATCH-UP IN A LONG-DISTANCE MIGRATORY SEABIRD

Article Open access 30 December 2024 TESTOSTERONE DYNAMICS OF MIGRATORY BIRDS DURING STOPOVER Article Open access 06 April 2025 REFERENCES * Rowan, W., _Proc. Boston Nat. Hist. Soc._, 39,

151 (1929). Google Scholar  * Wolfson, A., _Condor_, 47, 95 (1945). Burger, J. W., _Wilson Bull._, 61, 211 (1949). Farner, D. S., in _“Photoperiodism and related phenomena in plants and

animals”_, ed. R. B. Withrow (Amer. Assoc. Adv. Sci., 1959). Google Scholar  * Wolfson, A., in _“Photoperiodism and related phenomena in plants and animals”_, ed. by R. B. Withrow (Amer.

Assoc. Adv. Sci., 1959). Wolfson, A., in _“Comparative Endocrinology”_, ed. by A. Gorbman (Wiley, New York, 1959). Google Scholar  * Marshall, A. J., and Disney, H. J. de S., _Nature_, 177,

143 (1956); 180, 647 (1957); _Proc. Zool. Soc. London_, 127, 379 (1956). Article  ADS  CAS  Google Scholar  * Wolfson, A., _J. Exp. Zool._, 121, 311 (1952); 125, 353 (1954). Article  Google

Scholar  * Witschi, E., in _“Comparative Physiology of Reproduction”_, ed. I. C. Jones and P. Eckstein. (Mem. Soc. Endocrinol., No. 4, 1955). Google Scholar  Download references AUTHOR

INFORMATION AUTHORS AND AFFILIATIONS * Department of Biological Sciences, Northwestern University, Evanston, Illinois ALBERT WOLFSON & DAVID P. WINCHESTER Authors * ALBERT WOLFSON View

author publications You can also search for this author inPubMed Google Scholar * DAVID P. WINCHESTER View author publications You can also search for this author inPubMed Google Scholar

RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE WOLFSON, A., WINCHESTER, D. Effect of Photoperiod on the Gonadal Cycle in an Equatorial Bird, _Quelea

quelea_. _Nature_ 184, 1658–1659 (1959). https://doi.org/10.1038/1841658a0 Download citation * Issue Date: 21 November 1959 * DOI: https://doi.org/10.1038/1841658a0 SHARE THIS ARTICLE Anyone

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