I
I
I
L
180'
90'
0'
90'
I
I
I
I
(C)
FIQ. 19. Indirect indications of upwelling arcas throughout the world : (A) tiist,ribution
of phosphatic deposits (Tooms, 1967) ; (B) distribution of guano islands (Hutchinson.
1960) ; (C) distribution of sperm whale catches from Nantucket, 1726-1919 (Towneend, 1936) ; above, northern s u m m e r ; below, northern winter.
I
I
L
180'
90'
0'
90'
I
I
I
I
(C)
FIQ. 19. Indirect indications of upwelling arcas throughout the world : (A) tiist,ribution
of phosphatic deposits (Tooms, 1967) ; (B) distribution of guano islands (Hutchinson.
1960) ; (C) distribution of sperm whale catches from Nantucket, 1726-1919 (Towneend, 1936) ; above, northern s u m m e r ; below, northern winter.