The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberingsea00hood Year: 1981 (Nuclear Chicago Mark I). Total body water was calculated according to the method of HoUeman and Dieterich (1973), and lean body mass was computed as the quotient of total body water and the factor , which represents the proportion of water by weight in a lean mammal (Pace and Rathbun 1945). Fat was computed as the difference between total body weight and lean body mass. Total body weights of two harbor and spotted seals are plotted against time in Fi
The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberingsea00hood Year: 1981 (Nuclear Chicago Mark I). Total body water was calculated according to the method of HoUeman and Dieterich (1973), and lean body mass was computed as the quotient of total body water and the factor , which represents the proportion of water by weight in a lean mammal (Pace and Rathbun 1945). Fat was computed as the difference between total body weight and lean body mass. Total body weights of two harbor and spotted seals are plotted against time in Fig. 53-8, with the propor- tions of lean body mass (LBM) and body fat indi- cated. Body fat content appears to vary with sea- sonal variation of food intake, while total body weight and lean body mass increase. Mean annual body weight of two spotted seals from 1 to 9 years of age is plotted in Fig. 53-9. The elevated food intake of these seals from 1 to 3 years (see Fig. 53-3) corresponds to the steady increase in body weight (body growth) during that period. These growth data are in close agreement with growth information (length/age) obtained by Tikhomirov (1971) for Bering Sea spotted seals and are described by the regression equation W = e°'^''' (r = ) over the range of 0-3 years of age. Molt The annual shedding of hair in phocine seals occurs soon after the mating season, and since the seals appear to remain out of the water for much of its duration (McLaren 1958, Sergeant 1973, Frost et al. 1979, Johnson and Johnson 1979), they probably feed infrequently (McLaren 1958, Hart and Fisher 1964, Johnson et al. 1966, Mansfield 1967, Hubbard 1968, Spalding 1964, Goltsev 1971). Observations of wild and captive seals suggest that the shedding period may last as long as five weeks (Scheffer and Slipp 1944), and that it takes place first in young and Phoca vitulina richardsl o P. largha 8ix. .^-ifFAT AGE (years) Figure 53-7. Postnatal growth (weight/age) of harbor seals
Size: 2137px × 936px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
