CHENG and SHULENBERGER: DISTRIBUTION AND ABUNDANCE OF HALOBATES 



produces cold core "rings" of water which migrate 

 into the central North Atlantic watermass (Fu- 

 glister 1972; Lai and Richardson^'). These rings (as 

 opposed to the "cold core" within the ring) are bits 

 of the warm Gulf Stream. They are numerous, 

 physically large, temporally persistant, and are 

 known to carry with them large populations of 



■•Lai, D. Y, and P. L. Richardson. 1977. Distribution and 

 movement of cyclonic Gulf Stream Rings. Tech. Rep. Ref. No. 

 77-1, Graduate School of Oceanography, Univ. Rhode Island, 

 Kingston, R.I. 



organisms. Such populations may persist for 

 months or years ( Ortner et al. 1978). Other species 

 which occur primarily in the Atlantic equatorial 

 current system show distributions very like H. 

 micans, presumably as the result of occasional 

 captures of specimens carried by cold-core rings 

 (Nafpaktitis et al. 1977). 



Cold core rings are also produced by the 

 Kuroshio Current ( Hori 1970; Kawai 1972 ). When 

 sufficient samples become available, H. micans 

 will probably show a distribution in the western 

 half of the North Pacific central watermass very 



30° 



130' 



20° 



10° 



10° 



20' 



•2 



!• 

 •I 

 •3 

 •2 



•I 



•25 



I* 

 »2 



8* 



il8 



•I 

 •I 



•3 



•I 

 •3 



•I 

 •3 



•2 



•I 



120° 



100° 



■x: 



90° 



7^ 



80° 



70' 



•I 



2#2 



•1,3 



M.I%2XI 

 .,•53 



12^2 



!•' 

 I,I,7,3«L-I,I 



i,5,3j;g 



5,f>53 

 l'32,4 



2%l,ll 



•1,1 



•3 



Hal abates micans 



2,'»^-^-l,i 

 2,1,1* ■3,1,8 



^••1.2 

 2/1.10 



H,2 

 !•■ 



• 1,8 



*3 

 •2 



•I 

 •I 



30° 



20° 



0° 



10° 



20° 



130° 



120° 



110° 



100° 



90° 



80° 



70° 



Figure ^.—Halobates micans distribution in the EASTROR\C area, showing number of insects caught per tow. When insects were 

 caught in more than one tow at each station the numbers are separated by a comma. Small dots represent negative stations, large dots 

 are positive stations. 



583 



