. MONTHS Text-fig. 8. Foetal growth in length of southern hemisphere blue whale, Balaenoptera mtisculus, and fin whale, B. pliysalus- Rectangles represent monthly means, plus or minus two standard errors. (Black—blue whale; white—fin whale). In fact the greatest differences between his mean lengths are almost within the range of four standard errors (about 0-26 m. or 10 in.) calculated for the present material and certainly well within plus or minus two standard errors of the means for his very much smaller samples. The supposed difference between these two years is therefore unlikely to be si
. MONTHS Text-fig. 8. Foetal growth in length of southern hemisphere blue whale, Balaenoptera mtisculus, and fin whale, B. pliysalus- Rectangles represent monthly means, plus or minus two standard errors. (Black—blue whale; white—fin whale). In fact the greatest differences between his mean lengths are almost within the range of four standard errors (about 0-26 m. or 10 in.) calculated for the present material and certainly well within plus or minus two standard errors of the means for his very much smaller samples. The supposed difference between these two years is therefore unlikely to be significant. The average growth curve for the fin whale has been fitted as follows. The mean foetal lengths of the samples for October, November and December are thought to be very close to the true mean lengths for these months; they lie on a straight line which cuts the abscissa, when extrapolated, in mid-July. The slope of this line is very similar to that calculated for the sperm whale (Text-fig. 12) and the period from conception to Lt^ is estimated to be 33 days in the fin whale (Table i). This gives the second week in June as a mean conception date for the southern hemisphere fin whale, which agrees very well with independent conclusions from other data. (These include the follicular cycle of females at puberty, and the histological cycle of testis activity and of testis tubule diameters, ' There are six Antarctic whaling 'areas'. Areas III and IV are south of the Indian Ocean.
Size: 2681px × 1864px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
