HORIZONTAL DISTRIBUTION, GROWTH AND DYNAMICS OF DISPERSAL 361 



place (p. 315) in the slope waters of the Charcot Island district, the whole Pacific sector of the 

 East Wind drift, probably because of the massive and more or less permanent ice-cover that for long 

 has been known to exist in these high latitudes, is not a suitable breeding-ground for the krill. 



In the East Wind drift, although the selectivity of the stramin net gives a false impression of the real 

 extent of the summer larval outburst there, it is significant that such scattered occurrences as have 

 been recorded are confined exclusively to the Australian-Indian Ocean-Atlantic sectors, in the coastal, 

 or near-coastal, waters of which (p. 302) the eggs have been shown to be hatching and the principal 

 larval risings taking place. 



NORTHERN OR WEDDELL ZONE 



JANUARY 



FEBRUARY 



MARCH 



STATION 



FURC 6 

 " 5 



" 4 



" 3 



„ 2 



I 



CAL 3 



■' 2 



I 



N9 EXAM 



-INED 



1821 22232830|l2 15 17 IB 18 19 I9 20252525 2 22255889999 9 lO 12 12 12 12 19 2021 22 25 26 28 28 28 30303030 

 VF VII VI2 VI3 VI4 618 520 361 362 355 1138 1144 637 639 1987 I990 647 1994 374 2293 2300 194 W527 1328 

 303 1492 320 1965 618 620 622 362 355 1138 1144 368 369 639 1987 647 1994 373 375 2298 193 194 WS27 1328 



STATION 



DEPTH 



6 FURC 

 5 ■ 

 4 ■ 

 3 ■ 



2 ■ 

 I 



3 CAL 

 2 



I 



452 ? 7 20 512 217 148 328 92 616 8IO 278 21 156 113 55 94 87 48 80 287 89 108 148 

 133 54 99 54 304 59 30 249 25 572 159 50 44 116 545 357 325 36 65 III 119 98 490 353 



NSEXAM- 

 -INED 



SOUTHERN OR EAST WIND ZONE 



MONTH 



FEBRUARY 



MONTH 



DATE 

 STATION 

 DEPTH 



FURC 5 

 5 

 4 

 3 

 2 

 1 

 CAL 3 

 2 



17 17 17 28 28 28 



NI9 NI9 NI9 1545 1545 1545 



u m n m m D 



DEPTH 

 □ 50- O 



^ lOO- 50 



2 2 3 4 4 8 10 22 22 22 25 



1547 1547 260G2603 2603 2510 1312 1713 1713 1713 1720 



20 20 20 20 20 20 22 22 

 854 854 854 855 855 855 2335 2335 



D 



n m n 



DATE 

 STATION 

 DEPTH 



o so lOO 



Scak per cent 



250-I00 



ii» 



.Jill 



Aili.li 



6 FURC 



5 



4 



3 



2 



I 



3 CAL 



2 



I ■ 



N9 EXAM- 

 -INED 



59 39 5 116 19 3 8 2 167 52 39 12 9 97 119 90 



5 43 lOa 98 55 II 15 45 



N5 EXAM- 

 -INED 



Fig. III. Developmental condition of the massed surface larvae in summer. The April (early autumn) condition 

 in the East Wind drift is also shown (based on vertical net hauls). 



The developmental condition of the massed surface larvae in summer, based on the data from our 

 three uppermost vertical net hauls, ^ is shown in Fig. iii. Taking in turn (a) the situation in the 

 northern or Weddell zone, and {b) the situation in the southern or East Wind zone, the principal 

 facts presented are the following: 



(a) Northern or Weddell zone 



(i) Owing to the succession of risings taking place from January to March, the Calyptopis stages, 

 especially the First, may be encountered dominant in the surface swarms from their earliest appearance 

 in January until the end of summer. 



(2) The Second and Third Calyptopes are first encountered dominant in January and February 

 and the early Furcilias, Furcilias 1-3, first encountered dominant or in some measure of abundance 

 towards the end of the latter month. 



^ Except in winter and spring the larval gatherings from the stramin nets were not subjected to detailed analyses. We have 

 to rely, therefore, for our summer and autumn stage frequencies upon the material from the vertical nets. 



42 



