Pyramimonas amylifera conrad (prasinophyceae): Seasonal dynamics of a wild population, and the effects of temperature and salinity on growth and survival in culture

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Temperature, salinity and abundance of Pyramimonas amylifera were monitored over a 1-year period in a tidal salt marsh pool. The organism reached two peaks of abundance, the first in late fall before ice covered the pool, and the second in late winter after the ice had melted. Cysts, but no oc-toflagellate stages of this organism, were found in the pool in summer. The results of growth experiments on a clone of this organism isolated from the pool indicate that a temperature between 10 and 15 C is optimal. A temperature between 20 and 25 C is the maximum tolerable by this clone. The "short-term" salinity tolerance range of this clone was found to decrease with increasing temperature, a phenomenon which could affect the fitness of the organism as a tide pool inhabitant. The field and laboratory data indicate that although temperature and salinity were factors affecting the abundance of P. amylifera in the pool, other factors not considered in the study must have also been important. © 1979 Information Retrieval Inc.

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Journal of Plankton Research