412 JOHNSON AND BKINTON [CHAP. 18 



circulation with horizontal flow, such as exists in the Gulf of Main (Bigelow, 

 1926; Redfield, 1941) and, on a smaller scale, in coral atoll lagoons, where a 

 semi-closed system is set up in a vertical rather than horizontal plane (Johnson, 

 1954), provide the more simple and obvious conditions for interpreting the 

 interrelations of species within their ever-moving aquatic environment. 



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