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
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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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