The marine diatom Thalassiosira jluvintilis was grown in a continuous culture system at 20°C on a 12:12 L:D cycle over a series of nutrient-and light-limited dilution rates. Bannister's theoretical model describing nutrient-saturated growth gave an excellent fit to the light-limited data. A simple extension of the model allows description of nutrient-limited growth as well. Dark carbon loss rates were in the range lo-20% of daytime production rates at dilution rates >0.25*d-'.The relationship hctwcen Chl n:C ratios and dilution rate was linear under nutrient limitation and independent of the type of limiting nutrient. Productivity indices under nutrient limitation were found to be a hyperbolic function of dilution rate. N:C ratios were linearly correlated with dihltion rate llnder both light and nutrient limitation, but with the regressions having opposite signs.
-In late June 1983, Secchi depth d was 3.5 m and the vertical attenuation co&k&t K was 10.5 m-l in Otisco Lake. By 2 August, near the peak of a "whiting," the values were 1.4 m and 0.64 m-l, and calcium-containing, acidlabile particles >4 pm comprised -65% of total analyzed inorganic particles. From measured values of K and of the reflectance ratio R, the volume-scattering coefficient b was calculated to be 2.88 m-l and the volume absorption coefficient a, 0.3 1 m-l. Turbidity measurements confirmed the value of b and indicated -60% of the value was due to CaCO,. Of the value of a, water, Gelbstoff, and chlorophyll-bearing particles contributed 54, 25, and 21%, respectively.
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