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- W1986689693 abstract "Abstract We tested the applicability of McDuff & Chisholm's (1982) method for calculating the specific growth rate of phytoplankton populations to the naked dinoflagellate Gymnodinium cf. nagasakiense Takayama et Adachi (ex Gyrodinium aureolum Hulburt). This method, which relies on the determination of the fraction of cells undergoing mitosis (mitotic index), is only valid if the duration of mitosis ( t d ) does not vary with growth conditions and is known. The generation time of several cultured strains of G. cf. nagasakiense was made to vary between 1.6 and 14 days using a range of light and temperature conditions. The mitotic index was then determined at regular intervals during one or two light/dark cycles. The value of t d , calculated with McDuff & Chisholm's equation was found to vary proportionally to the generation time t g . This violates the authors's assumption and implies that this method cannot be directly applied for this species in the field. We suggest that the constancy of t d should be systematically verified on culture populations of phytoplankton species, before trying to determine their in situ growth rates. Our experiments also revealed the presence of two different-sized subpopulations within the Gymnodinium cultures. They were found to exhibit quite different cell division timing during the light/dark cycle." @default.
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- W1986689693 date "1990-10-01" @default.
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- W1986689693 title "Variability in the growth characteristics of Gymnodinium cf. nagasakiense (Dinophyceae) and its consequences for the determination of in situ growth rates" @default.
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- W1986689693 doi "https://doi.org/10.1016/0022-0981(90)90089-u" @default.
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