BIOGEOGRAPHICAL BOUXDARIES 



219 



masses and, from the distribution of these species, he estimated 

 the origins of the different components of mixed water (Bary, 

 1959a). 



He has continued this technique in Edinburgh and Fig. 10 

 shows the application of the method to the Continuous Plank- 

 ton Recorder material. The results for the months of August and 

 September, 1957, have been combined. A large number of tem- 

 perature and salinity observations were available from routine 

 sampling aboard commercial freighters, ocean weather ships and 

 research vessels. From these a T /S diagram was prepared for the 

 Atlantic part of the survey, the central North Sea, and the shelf 

 waters, including the western entrance to the English Channel. 

 The boundaries of the water masses were drawn in the usual way. 

 Many of the ships taking these salinity and temperature observa- 



3^-5 



35-5 



350 



SALINITY 7oo 

 A-Calanus minor M-Sagitta elegans 



O - P/ euromamma robusta 

 Fig. 10. Temperature-salinity-plankton diagram for the northeastern Atlantic 

 and the central North Sea during August and September 1957 (modified from Bary, 

 1959a). 



