Paper 2C 



presented with little corrrnent. However/^ some explanation of the 

 units presented and the counting system which produced them is in 

 order. The countinq system used was designed to allow for the 

 rapid analysis of large numbers of plankton samples taken monthly 

 from large areas of the North Atlantic Ocean. 



P hyt op lankt on were recorded as number of occurrences per twenty 

 0.295- mm diameter microscopic fields taken diagonally across a 

 section of bolting silk which had filtered 3 m of seawater (a 

 10-n mi Sample). The silk aperture size was 225 x 234 mm. lean 

 occurrences of each taxum per water mass per month are shown in 

 Figures 20. 2 and 20.3. 



Zoop 



thei 

 of t 

 abun 

 subs 

 mu It 

 per 

 s amp 

 t oge 

 Z OOP 

 the 

 prec 

 in F 

 me t h 

 pr es 

 stag 



lank 

 r s 

 he s 

 danc 

 t i tu 

 ip li 

 sa mp 

 le s 

 t h er 

 lank 

 numb 

 ludi 

 igur 

 ods 

 ent 

 es ) 



t on 

 i ze . 

 i Ik 

 e c 

 ted 

 ed 

 le ( 



pe r 



to 

 ton 

 er o 

 ng 

 es 2 



see 

 in b 

 and 



ware 

 Zo 



we re 



ateg 



for 



by 



3 cu 

 w a 



op t a 

 >2 



f a 



the 



0-6 

 Co 



ot h 



are 



cou 

 op la 



est 

 or i e 

 each 

 an 



m ) . 

 te r 

 in t 

 mm 

 II 



need 

 and 

 lebr 

 size 

 pres 



nt ed by 

 nkton t 

 i ni a t e d 

 s . /s n 



cat eg o 



aliquot 



F ina 



mass p 

 he numb 

 were a 

 animals 



f or an 

 20.7. 

 ook (1 



cat ego 

 ented s 



e i t he 

 a xa <2 



to f 



"sec 



r y / an 



facto 

 lly^ 

 e r mon 

 er s s h 

 na I yze 

 on 



a I i qu 



For 

 96C). 

 r i e s ( 

 epar at 



r of 



mm s 

 all 

 e p t e d 

 d th 

 r to 

 the 

 th (s 

 own i 

 d in 

 a si 

 ot fa 

 more 



Som 

 usual 

 e I y . 



two 

 een 

 with 



va I 

 ese 

 give 

 numb 

 e e F 

 n F 

 the 

 Ik 

 c t or 



det 

 e t 

 ly d 



me t h 



ina 



i n 



ue" 

 ace 

 the 



er s 



ig. 



iqu r 

 same 

 was 



T 

 ails 

 axa 

 i f fe 



ods / Q 



stagge 



one of 



(weight 



epted 



numbe r 



for a 



23.1 ) w 



es 20.4 



manner 



record 



he se da 



conce 



of zoop 



rent d 



epend i n 



red tra 

 3 se 

 e d ni e a n 

 va lues 



of p I a 

 II ana 

 ere ave 

 and 



except 

 ed/ th 

 ta are 

 rn ing 

 lank ton 

 eve lopm 



c on 

 verse 

 t of 

 ) was 



were 

 nk t on 

 ly zeo 

 raged 

 2 G . 5 . 



that 

 ere by 

 shown 

 these 



were 

 ent a I 



Two features of the plankton dynamics which are not obvious from 

 the figures are mentioned below. Thecosomate pteropods increased 

 and decreased along with the Cerat.ium tripos bloom in all 

 instances during the springtime. Compare Figures 2C.2 with 20.4/ 

 and 20.3 with 2U.5. The cladoceran Pennil^la ^P« dominated the 

 plankton in October Chesapeake Bight Shelf Water samples in 1976 

 but were not abundant in fall samples of 1974 and 1975." 



ZOOPLANKTON DF A WARVI CORE tDDY 



A decayed warm core Gulf Stream eddy (called Eddy 

 U.S. Navy ce anog raph i c Office) was traversed by 

 February 1976 (Fig. 20.1). 



D by the 

 the CPR in 



^Atlantic Environmental Group/ National f^arine 

 Service/ NO A A/ Narraciansett/ Rl G?P82. Unpubl. data. 



Fisheries 



338 



