Gaskm et al.: Phocoena phocoena in the coastal waters of northern Japan 



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Figure 3 



The western North Pacific and western Bering Sea, showing average summer surface isotherms 

 (July-September) (Japanese Meteorological Agency 1986; Miyashita and Kasuya 1988; and Nasu 

 1963, 1966). Diagonal hatching indicates postulated summer range of about 90<7r of the harbor 

 porpoise population based on criteria of Winn*. Solid circles indicate confirmed summer records. 

 Solid squares are confirmed spring I April-June) records. 



Figure 4 



The western North Pacific and western Bering Sea, showing average winter surface isotherms 

 (December-March) (Japanese Meteorological Agency 1986: Miyashita and Kasuya 1988; and Nasu 

 1963, 1966). Horizontal hatching indicates postulated winter range of about 90<7r of the harbor 

 porpoise population based on criteria of Winn 6 . Solid circles indicate confirmed winter records. 



