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- W2023703231 abstract "The perennially ice-covered lakes of Antarctica have hydrodynamically stable water columns with a number of vertically distinct phytoplankton populations. We examined the photosynthesis-irradiance characteristics of phytoplankton from four depths of Lake Bonney to determine their physiological condition relative to vertical gradients in irradiance and temperature. All populations studied showed evidence of extreme shade adaptation, including low Ik values (15–45 μE · m−2· s−1) and extremely low maximal photosynthetic rates (PBm less than 0.3 μg C ·μg chl a−1· h−1). Photosynthetic rates were controlled by temperature as well as light variations with depth. Lake Bonney has an inverted temperature profile within the trophogenic zone that increased from 0° C at the ice-water interface to 6° C from 10 to 18 m. Deeper phytoplankton (10 m and 17 m) were found to have photosynthetic capacities (PBm) and efficiences (α) three to five times higher than those at the ice-water interface. However, Q10 values were only ca. 2 for PBm (no temperature dependence was evident for α), suggesting that a simple temperature response cannot explain all the differences between populations. Lake Bonney phytoplankton (primarily cryptophytes and chlorophytes) had photosynthetic characteristics similar to diatoms from other physically stable environments (e.g. sea ice, benthos) and may be ecologically analogous to multiple deep chlorophyll maxima." @default.
- W2023703231 created "2016-06-24" @default.
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- W2023703231 date "1992-04-01" @default.
- W2023703231 modified "2023-09-25" @default.
- W2023703231 title "PHOTOSYNTHESIS-IRRADIANCE RELATIONSHIPS IN PHYTOPLANKTON FROM THE PHYSICALLY STABLE WATER COLUMN OF A PERENNIALLY ICE-COVERED LAKE (LAKE BONNEY, ANTARCTICA)1" @default.
- W2023703231 doi "https://doi.org/10.1111/j.0022-3646.1992.00179.x" @default.
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