. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. JOHN J. KAROL. to these values but we may say in passing that they are of the same order of magnitude as the findings of King 1 in the Norway rat. In both we find a maximum in summer followed by a mini- mum in autumn. Combining the earlier data (1915-1921) with these additional data we get the following monthly sex ratios: January (395) + February (469) 99-54 ± March (1,129) + April (660) 113-65 + May (967) + 4-61 June (707) ± 5-29 July (592) + August (818) +
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. JOHN J. KAROL. to these values but we may say in passing that they are of the same order of magnitude as the findings of King 1 in the Norway rat. In both we find a maximum in summer followed by a mini- mum in autumn. Combining the earlier data (1915-1921) with these additional data we get the following monthly sex ratios: January (395) + February (469) 99-54 ± March (1,129) + April (660) 113-65 + May (967) + 4-61 June (707) ± 5-29 July (592) + August (818) + September (617) + October (564) ± November (367) + December (279) + 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75 6Z6 346. 342 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC FIG. 2. The sex ratio of Pcromyscus for each month of the year com- puted for the combined material from 1915 to 1926. Numbers along graphs indicate numbers born in each month. • Here, as in the earlier data alone, we find two annual maxima, one occurring in March and April; the other from August to Oc- 1 Archir fiir Entwickungsmeckanik, 1927, 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
