VERTICAL MIGRATION RECONSIDERED 



329 



Table LXVIII 

 Showing the numbers o/Calanus acutus, Rhincalanus gigas, and Oithona frigida taken at 

 three depths at stations in ranges of high and low phytoplankton values during the 

 daylight hours of 0800-1600. Within each range of phytoplankton values the hauls 

 are arranged in order of stations of ascending phytoplankton values from left to right. 

 Except where indicated by footnote stations are taken in December and January 



Depth of 

 nets in m. 



Phytoplankton 

 < 500,000 cells per N 50 V haul 



Actual numbers in nets at 

 each station 



Mean 



Phytoplankton 

 > 500,000 cells per N 50 V haul 



Actual numbers in nets at 

 each station 



Mean 



C alarms acutus (N 70 H nets) 



o-5 

 Av. 61 



Av. 115 



o-5 

 Av. 61 

 Av. 115 



o-5 

 Av. 61 

 Av. 115 



0,0, o, of, of, if, o, 0,0 

 0,4380, 2, if, of, 6f, 1, 3, — 

 72, 640, 208, 6f, iof, 2of, 40, 

 164, 16 



o 

 549 

 131 



2, 198, o, o, o, o, o, o, o, 2 



12, 39, O, 40, 50, 4, 52, 192, 800, 720 



— , 5600, i, 40, 100, 39, 6, — , 1275, 



120 



Rhincalanus gigas (N 70 H nets) 



o, o, o, o, 0,0, 1, o, o, o 



141, 15, o, 20, 6, 3, 14, 16, 380, 120 



— , 37, o, 80, 180, 318, 50, — , 200, 52 



o, o, o, if, 2f , if, 0,0,0 o 



o, 4, O, 2f , 5J , of, 0,0—, I 



12, 188, 220, 62f, 88f, 27-f, 41, 115 



13,388 I 



Oithona frigida (expressed in thousands) (N 70 H nets) 



o, o, o, i7f , i2f , 3of , o, o, o 7 0,15,0,0,1,1,0,0,0,1 



4, 1418, o, 2f , 3f , 52f , 2, o, — 185 19,2,1,82,11,1,38,22,4 



o, I3.4 2 . i5t» nf. 2if, 27,0, 31 18 — , 139, o, 59, 10, 7, 7, — , 30, 3 



20 

 191 

 898 







72 



"5 



2 

 20 

 32 



Same 



— ■ = No Sample. f = Station taken in May. 



Table LXIX 

 as Table LXVIII bid for stations during hours of darkness 2000-0400 



Depth of 

 nets in m. 



Phytoplankton 

 < 500,000 cells per N 50 V haul 



Actual numbers in nets at 

 each station 



Mean 



Phytoplankton 

 > 500,000 cells per N 50 V haul 



Actual numbers in nets at 

 each station 



Mean 



Calanus acutus (N 70 H nets) 



o-5 

 Av. 64 

 Av. in 



o-5 

 Av. 64 

 Av. in 



o-5 

 Av. 64 

 Av. in 



= No sample. 



Station taken in May. 



