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Estimated plankton abundance at station PS63/064-6
Arbitrary density units (++++ = very abundant; + = least abundant). Extremely dense sample; too dense to be counted, sample taken from sea water supply via large volume... -
Plankton abundance measured in surface water during Polarstern cruise ANT-XX/2
Samples taken from sea water supply via large volume centrifuge in parallel to other sampling (CTD and MUC)
