Discovery reports (1942) Discovery reports discoveryreports21inst Year: 1942 3o8 DISCOVERY REPORTS on this account alone, for at other seasons the agreement is good. The figures given in Table 2, obtained over the short period covering the main increase in the locality in ZOOOt 1500 1000 500 JuIl) August September October November December Januarq Febru3rL| March April Mau June Fig. lo. Northern Region. Annual variation in plant pigments per m.; means of all available observations (50-0 m. hauls) at mean dates. Numbers of observations in brackets. Note anomalous figure for November mentio
Discovery reports (1942) Discovery reports discoveryreports21inst Year: 1942 3o8 DISCOVERY REPORTS on this account alone, for at other seasons the agreement is good. The figures given in Table 2, obtained over the short period covering the main increase in the locality in ZOOOt 1500 1000 500 JuIl) August September October November December Januarq Febru3rL| March April Mau June Fig. lo. Northern Region. Annual variation in plant pigments per m.; means of all available observations (50-0 m. hauls) at mean dates. Numbers of observations in brackets. Note anomalous figure for November mentioned in text. question during the circumpolar cruise in 1937, clearly show how maximal values were observed early in December in spite of the November values being lower than else- where. Table 2 Colour units Pmg. Simg. Station Date per m., atoms atoms 50-0 m. hauls per m. per m.' 2089 20. xi. 37 450 2-11 38-6 2091 21. XI. 190 2'03 36-6 2093 22. XI. 130 2-09 33-3 2106 27. xi. 1170 2-05 28-8 2131 5- xii. 37 5760 1-54 14-4 2141 9. xn. 1630 1-98 iS-8 2143 10. Xll. 5040 1-50 2-S The very close agreement between nutrient salt content of the water and estimated quantities of plant pigments is also clearly shown by this table. It would not be so good over a longer period when the effect of the biological uptake would be masked by regeneration or replacement in varying degrees, but it seems to me that if our Harvey estimations do not reflect the real quantity of phytoplankton production fairly closely, the high degree of correlation with chemical data obtained quite independently by our hydrologists at the critical period would be utterly impossible.
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