Abstract
FEW data are available concerning the environmental factors involved in the ‘timing’ of the reproductive cycles of equatorial birds. The annual fluctuation of day-length on the equator is only about two minutes. Wolfson1,2, considers it possible that “summation of daylengths or the daily dose of light”, rather than increasing day-lengths as such, might be the critical environmental factor in determining the periods of migration and breeding of equatorial, as well as other, species.
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References
Wolfson, A., Sci. Mon., 74, 191 (1952).
Wolfson, A., Condor, 55, 187 (1953).
Scott, H. M., and Payne, L., cited by Marshall, F. H. A., Biol. Rev., 17, 68 (1942).
Brown, F. A., and Rollo, M., Auk, 57, 485 (1940).
Rollo, M., and Domm, L. V., Auk, 60, 357 (1943).
Marshall, A. J., Quart. J. Micro. Sci., 90, 265 (1949).
Whetham, E. O., J. Agric. Sci., 23, 383 (1933).
Marshall, A. J., “Reproduction in Male Birds”. Chapter in “The Comparative Endocrinology of Vertebrates” (London, 1955).
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MARSHALL, A., DISNEY, H. Photostimulation of an Equatorial Bird (Quelea quelea, Linnæus). Nature 177, 143–144 (1956). https://doi.org/10.1038/177143a0
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DOI: https://doi.org/10.1038/177143a0
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