Discovery reports (1964) Discovery reports discoveryreports32inst Year: 1964 INTIMATE STRUCTURE OF THE SWARMS 251 By means of this apparatus we are investigating whether the structure of a patch is in any way orderly Above all, we are considering the food availability in the interior of the swarm, and the varying distribution of sex-ratios and developmental stages. In this way the form and internal structure of a larval swarm might perhaps be accurately mapped together with the form and internal structure of adjacent swarms and the distances separating them from each other. We already indeed
Discovery reports (1964) Discovery reports discoveryreports32inst Year: 1964 INTIMATE STRUCTURE OF THE SWARMS 251 By means of this apparatus we are investigating whether the structure of a patch is in any way orderly Above all, we are considering the food availability in the interior of the swarm, and the varying distribution of sex-ratios and developmental stages. In this way the form and internal structure of a larval swarm might perhaps be accurately mapped together with the form and internal structure of adjacent swarms and the distances separating them from each other. We already indeed find that such swarms, in so far as their stage frequencies go, are anything but disorderly. 1 I I [ 1 1 r DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT T 1 f 1 1 r NOV DEC JAN FEB MAR APR Fig- 54- Growth curves of E. superba after Ruud and Bargmann. GROWTH AS INDIVIDUALS AND SWARMS As INDIVIDUALS In illustrating the growth-rate of plankton animals, it is customary to plot the average monthly or half-monthly length of as large a series of measured specimens as possible. Thus Ruud (1932), mainly from specimens collected from whales' stomachs, and Bargmann (1945) from specimens collected from the plankton, obtain the growth curves reproduced in Fig. 54. Before one year's growth is over, when the adolescents (p. 339, Fig. 95) first appear in substantial numbers in August, Bargmann is able to distinguish between males and females and accordingly from August onwards her growth curve divides into its male and female components. As Fig. 54 shows the growth- rate in the two sexes is very similar, the two curves, although the females are consistently smaller than the males,! following approximately the same course. Ruud does not treat the sexes separately and since he only had substantial larval samples for January, and little or no larval material covering the rest of the year, his curve for the greater part of the first year's growth i
Size: 1918px × 1043px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
