. FURC 6 I I—T—I DEPTH I I r I^H T^II ° so lOO ^H^H 0 so loo 90 68 168 209 220 167 26 154 84 34 100 63 lOO 100 80 56 26 28 90 79 201 17 72 620 I057 532 158 64 45 19 177 230 169 72 72 100 143 25 162 344 79 289 1480 6 FURC 5 4 3 2 I 3 CAL 2 N? EXAM- -INED Fig. 113. Developmental condition of the massed surface larvae in autumn. For East Wind zone see Fig. iii. (3) The autumnal scarcity of late Furcilia dominants, which seems anomalous in view of the already well established existence of such dominants (p. 361, Fig. iii) in Weddell West in the latter part of March, is probably to be ascribed to t
. FURC 6 I I—T—I DEPTH I I r I^H T^II ° so lOO ^H^H 0 so loo 90 68 168 209 220 167 26 154 84 34 100 63 lOO 100 80 56 26 28 90 79 201 17 72 620 I057 532 158 64 45 19 177 230 169 72 72 100 143 25 162 344 79 289 1480 6 FURC 5 4 3 2 I 3 CAL 2 N? EXAM- -INED Fig. 113. Developmental condition of the massed surface larvae in autumn. For East Wind zone see Fig. iii. (3) The autumnal scarcity of late Furcilia dominants, which seems anomalous in view of the already well established existence of such dominants (p. 361, Fig. iii) in Weddell West in the latter part of March, is probably to be ascribed to the fact that the majority of our April observations in Weddell West were made in two seasons when there seems to have been a marked decline in the activity of the Antarctic bottom water resulting (p. 331) in a late arrival of deep larvae in Weddell West and a correspondingly late development to the older Furcilia state. (4) As expressed by the stage frequency the modal values of the autumnal swarms display a highly heterogeneous pattern. In the East Wind zone the April swarms (Fig. iii) continue to reveal a much retarded develop- mental condition, the First Calyptopis remaining still virtually the only dominant surface stage. Now it is true it is being encountered more frequently, and increasingly, in moult, in one instance (Station 854) the Second Calyptopis having become slightly dominant. The continuance of the First Calyptopis as virtually the sole dominant in these high latitudes until so late in the year is perhaps not surprising when it is recalled that at two of the three stations (p. 93, Table 14, Stations 854 and 855) where we struck the larvae there extensive risings were still taking place. Winter. Thus far it will have been seen, that is from January up to the end of June, we have been dealing with a heterogeneous assemblage of purely larval swarms yet to become adolescent, swarms in which the developmental condition has been determined by staging alone. From
Size: 4730px × 1057px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
