The
condition of the culture was checked daily. The chlorophyte
Brachiomonas submarina (TV15) and the cryptophyte Rhodomonas
salina (TV22), obtained from the culture collection of Tva¨rminne
Zoological Station(University ofHelsinki)were grownexponentially
onf/2-Simedium(GuillardandRyther,1962;Guillard,1975)at18 8C
and 6%salinity in aged seawater. Cell concentrations of the cultures
weredeterminedbymicroscopy(LeitzLabovert,25)usingaBu¨ rcher
chamber. Also, the dry weight (DW, mg l1) was determined by
filtering a known volume ofwell-mixed cultures on combusted (4 h,
450 8C), pre-weighed filters (WhatmanGF/F), dried at 65 8C for 24 h.
Thecondition of the culture was checked daily. The chlorophyteBrachiomonas submarina (TV15) and the cryptophyte Rhodomonassalina (TV22), obtained from the culture collection of Tva¨rminneZoological Station(University ofHelsinki)were grownexponentiallyonf/2-Simedium(GuillardandRyther,1962;Guillard,1975)at18 8Cand 6%salinity in aged seawater. Cell concentrations of the culturesweredeterminedbymicroscopy(LeitzLabovert,25)usingaBu¨ rcherchamber. Also, the dry weight (DW, mg l1) was determined byfiltering a known volume ofwell-mixed cultures on combusted (4 h,450 8C), pre-weighed filters (WhatmanGF/F), dried at 65 8C for 24 h.
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