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Regulation of growth in an estuarine clone of gonyaulax tamarensis salinity dependent temperature responses


, : Regulation of growth in an estuarine clone of gonyaulax tamarensis salinity dependent temperature responses. Journal of Experimental Marine Biology & Ecology 62(1): 25-38

Batch-culture experiments with G. tamarensis Lebour indicated variations in population growth rate and cell size as a function of temperature and salinity. The data on population growth were used to formulate a simple model which predicts bloom development in the absence of other regulatory factors. The agreement between observed and predicted results is quite good for field populations of G. tamarensis in Cape Cod [Massachusetts, USA] embayments during 1977 and 1980. Although other factors may complicate population dynamics, this agreement indicates that in some cases the development of blooms in this region can be accounted for simply on the basis of salinity-dependent temperature regulation of cell division rates. In the cultures, cell size changed with population growth rate; small cells dominated in populations growing rapidly. The larger cell size in the slower growing cultures failed to compensate for the reduced population growth rates when rates of biosynthesis were compared. The potential use of cell size variability in estimating in situ growth rates, and its role in bloom decline through size-selective grazing by zooplankton are considered.

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