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- W2316908044 abstract "Experiments utilizing were performed during the 1979 and 1980 ice-free seasons in the shallow and deep-chlorophyll layers of Castle Lake (California) to determine the effects of dissolved inorganic nitrogen (DIN) concentration on the rates of DIN assimilation. The half-saturation constant (K,) for assimilation of NO3 was about 12 jig N 1' in the epilimnion (3 m) and mid-hypolimnion (20 i), and increased to about 50 jig N 1-1 in the aphotic-lower hypolimnion (25 i). A similar pattern was evident for NH' in 1979 (K, 2.7, 2.6, and 9.3 jig N 1-' at 3, 20 and 25 m, respectively) but not 1980 (K, = 7.0, 14.0, and 6.0 jig N 1-' at 3, 20 and 25 m, respectively). The trend in K, values paralleled the availability of DIN to the phytoplankton at the various depths. Relatively low NH' enrichments (5 jig NHI-N 1-') strongly inhibited assimilation of NO3 at 3 m. Assimilation of NO3 was less sensitive to NH' at 20 m (40 jig NH4-N I' was required to inhibit NO3 assimilation) and was not affected by NH' concentration up to about 75 jig N 1-' at 25 m. This strategy appears advantageous to the phytoplankton because NH' is the primary source of nitrogenous nutrition at 3 m while NO3 may be a more important nitrogen source below 20 i. The seasonal persistence of the deep-water phytoplankton maximum in Castle Lake appears to be dependent to a large extent on the adaptations of these organisms to the ambient DIN supply." @default.
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- W2316908044 date "1985-08-01" @default.
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- W2316908044 title "Nitrogen Metabolism of the Shallow and Deep-Water Phytoplankton in a Subalpine Lake" @default.
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- W2316908044 doi "https://doi.org/10.2307/3565231" @default.
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