The vitamin B requirement of Phaeocystis globosa (Prymnesiophyceae) |
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Authors: | Peperzak L; Gieskes WWC; Duin R; Colijn F |
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Institution: | National Institute for Coastal and Marine Management / RIKZ, P.O. Box 8039, NL-4330 EA Middelburg, The Netherlands,
1 University of Groningen, Dept of Marine Biology, P.O. Box 14, NL-9750 AA Haren, The Netherlands and
2 Forschungs- und Technologie-Zentrum Westküste, Hafentörn, D-25761 Büsum, Germany |
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Abstract: | In batch cultures of flagellates and non-flagellate cells ofPhaeocystis globosa, the biomass yield was significantly enhancedby the addition of a mixture of the vitamins thiamine (B1),cyanocobalamin (B12) and biotin (H). A bioassay with B1 andB12 using the non-flagellate cells of P.globosa showed thatthis prymnesiophyte is a B1 auxotroph. The bioassay also indicateda significant difference in growth rate between culture mediumwith 10 nmol l1 B1 (µ = 0.80 day1) and culturemedium with 10 nmol l1 B12 (µ = 0.52 day1).These findings are discussed in relation to the hypothesis thatcentric diatoms, through vitamin B1 excretion or B12 depletion,initiate Phaeocystis blooms. It is concluded, however, thatan alternative hypothesis, that diatoms provide a solid substratefor colony initiation, has more experimental support. |
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