HORIZONTAL DISTRIBUTION, GROWTH AND DYNAMICS OF DISPERSAL 371 



from the Weddell drift and the South Georgia whaling grounds, covers also the region immediately 

 to the east of the Weddell stream between 30° and 65° E (swarms distinguished by a dagger), the 

 West Wind region south-east of Kerguelen (swarms distinguished by an asterisk) and includes several 

 stations in the Bransfield Strait and west of Graham Land (swarms distinguished by two asterisks) 

 where the larvae encountered were probably (p. 371) of East Wind origin. Briefly the major features 

 illustrated are the following: 



(i) The growing dominance of the early adolescent over the Sixth Furcilia encountered in the 

 Weddell zone throughout October. 



MONTH 



DATE 

 STATION 

 ADOL 

 FURC 6 

 .. 5 

 40 

 m36 

 i32 

 <28 

 24 

 ^20 

 il6 

 y 12 

 8 

 4 



9 10 17 17 19 25 26 26 27 28 29 I 3 3 4 7 7 7 B 9 II 



2879 2B80W282W283 !l029 511 517 1039 518 1632 52312119 1640 I540 2128 S 2136 2137 2139 2513 S 



L .1 1. . .^/ 



N2 EXAM 

 -INED 



SEPTEMBER 



NOVEMBER 



DECEMBER 



T"TTIT=^TT 



MONTH 



DATE 

 STATION 



ADOL 

 6 FURC 

 5 " 

 40 

 36 UJ 

 32 i 



24 



20? 

 16 i 



12 ui 



18 100 100 20O 32 lOO 197 74 1570 100 143 1637 86 55 57 



87 266 189 99 



S = SAMPLE FROM SIGHTED SWARM 



Fig. 119. Developmental condition of young swarms in the West Wind region south-east of Kerguelen compared 

 with the corresponding condition in the Weddell zone at the same, or approximately the same, time. 



(2) The absolute dominance of the early adolescent over the Sixth Furcilia encountered in the 

 Weddell zone in November and the virtual disappearance of the latter from the plankton before the 

 end of the month. 



(3) The survival of the Sixth Furcilia in small numbers between 30° and 65° E in November and 

 in the West Wind region south-east of Kerguelen, in one instance (Station 1640) in large numbers, into 

 early December. 



(4) The overall backward condition of the November-December swarms of East Wind, or prob- 

 able East Wind, origin as compared with the corresponding condition of many of their contemporaries 

 in the Weddell stream. 



Summer. The continued survival of the Sixth Furcilia in the higher latitudes of the East Wind 

 drift, but nowhere else, over spring and into summer (January-March), 11-13 months after the first 

 major risings (p. 310, Fig. 74) take place in this coastwise stream, is shown in Fig. 120. The 

 numbers that so survive it will be seen are negligible. 



The gross distribution of the massed surface larvae is shown by seasonal symbols in Fig. 121. 

 In order to bring the inadequately sampled First Calyptopis (p. 360) into the distributional picture 

 and further to bring together on a single page as much relevant information as possible, the data from 

 the vertical as well as from the stramin net hauls have been used in the construction of this figure 

 throughout. The seasonal symbols employed have been used only where gatherings of major signifi- 

 cance have been recorded, hauls of less than 100 in the stramin nets and of less than 50 in the three 

 uppermost vertical nets being distinguished by small black plots wherever they were encountered 

 throughout the year. The principal features thus illustrated are the following: 



(i) The great summer outburst in Weddell West which by autumn has involved the whole of the 



Weddell zone and continues to do so throughout winter into spring. 



43-2 



