. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 70 FARMER, FOLLETT, KING AND MORTON r C 1-2 g o O o o> -. Begin 20L 4D o o o o 8 8 o 10 20 30 40 50 Days FIGURE 1. Ovarian weights (W) of first-year white-crowned sparrows as a function of time after a change in daily photoperiod from 8 (8L 16D) to 20 hours (20L 4D). Closed circles represent birds subjected to 20L 4D; open circles represent birds continued on 8L 16D. natural conditions of temperature and photoperiod (Table I; also King et al., in press). Migrating females taken in Pullman in early
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 70 FARMER, FOLLETT, KING AND MORTON r C 1-2 g o O o o> -. Begin 20L 4D o o o o 8 8 o 10 20 30 40 50 Days FIGURE 1. Ovarian weights (W) of first-year white-crowned sparrows as a function of time after a change in daily photoperiod from 8 (8L 16D) to 20 hours (20L 4D). Closed circles represent birds subjected to 20L 4D; open circles represent birds continued on 8L 16D. natural conditions of temperature and photoperiod (Table I; also King et al., in press). Migrating females taken in Pullman in early May had a mean ovarian weight of ± mg. and a pituitary gonadotropin content of ( ) ju, For females taken late in May, shortly after arrival on the breeding grounds in the vicinity of Fairbanks, Alaska, the respective means were 326 ± 129 mg. and () ^ In contrast, the respective means. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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