Abstract
THE effects of light intensity and day-length on reproduction in the English sparrow have been studied quantitatively in the laboratory by George A. Bartholomew, jun. (Bull. Mus. Comp. ZooL, Harvard 101, No. 3 ; Feb. 1949). He has also considered the ecological significance of these factors in controlling the breeding season of this species in Nature.
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HAWKINS, T. Effects of Light Intensity and Day-Length on Reproduction in the English Sparrow. Nature 163, 966–967 (1949). https://doi.org/10.1038/163966b0
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DOI: https://doi.org/10.1038/163966b0