Daily irradiance governs growth rate and colony formation of Phaeocystis (Prymnesiophyceae) |
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Authors: | Peperzak Louis |
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Affiliation: | Ministry of Transport & Public Works, Tidal Waters Division Grenadierweg 31, NL-4338 PG Middelburg, The Netherlands |
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Abstract: | Phaeocystis was cultured at a range of ecologically significantdaily irradiances under nutrient-replete conditions. Below athreshold of 100 W h m1 day1, the cells were smalland flagellated, and remained solitary. Above this threshold,the cells were larger and able to form colonies. Growth rateand colony formation were maximum at sea surface irradiances(>700 W h m2 day2). Presumably, colonial growthis a strategy to maintain optimum growth rates in the watercolumn. Sinking, nutrient-stressed colonies reach low irradiancesand colonial cells can transform into small solitary flagellatedcells. These observations are important in understanding theecology and life cycle of Phaeocystis. |
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