. do 04 da i2 ife 2b do 04 oe do 04- de <z ife 20 do 04 os 00 04 oe 12 ie 20 00 04 oa Fig. 18. Diurnal variations of macroplankton species. The curves show the average number per haul at four-hour intervals. Midnight and midday are accentuated by black and white triangles respectively. The species are arranged roughly in order of the magnitude of their diurnal variation (see Table I, p. 95).

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