Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 138 DISCOVERY REPORTS monthly intervals on each side of it, the points are divided up into a number of groups representing pregnancies starting in each month. When the pregnancies are counted and plotted against months, the curve shown in Fig. 42 giving the frequencies of pairing by months, is obtained. This makes it clear that the majority of pairings take place in the months of August to December inclusive, with the maximum in October. By plotting the same curve with the time scale shifted 15 months later the curv
Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 138 DISCOVERY REPORTS monthly intervals on each side of it, the points are divided up into a number of groups representing pregnancies starting in each month. When the pregnancies are counted and plotted against months, the curve shown in Fig. 42 giving the frequencies of pairing by months, is obtained. This makes it clear that the majority of pairings take place in the months of August to December inclusive, with the maximum in October. By plotting the same curve with the time scale shifted 15 months later the curve of birth frequencies shown in Fig. 43 is obtained. This shows the season of parturition extending from December to April, with the maximum in February. 'jun'jul'Aug'Sep Oct Nov Dec Jan Feb Mar Apr Fig. 42. Sperm whale. Pairing frequencies by months.
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