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JOURNAL OF PLANKTON RESEARCH | VOLUME 1 | NUMBER 4 | PAGES 291-300 | 1979
© Oxford University Press

research-article

Pyramimonas amylifera Conrad (Prasinophyceae): seasonal dynamics of a wild population, and the effects of temperature and salinity on growth and survival in culture

William E. Gardiner* and Paul E. Hargraves

Department of Botany, University of Rhode Island Kingston, Rhode Island, U.S.A. 02881 Graduate School of Oceanography and Department of Botany, University of Rhode Island Kingston, Rhode Island, U.S.A. 02881

Received on September 1, 1978; accepted on September 1, 1979

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.

*Present address: Department of Biology, University of South Florida, Tampa, Florida, U.S.A. 33620. (Address for reprints)


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