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- W99139022 abstract "The biomass and seasonal variability of all groups of planktonic organisms was investigated in saline meromictic Mahoney Lake (British Columbia, Canada). After ice-break, meltwater formed a stable surface layer which resulted in steep vertical gradients of temperature, salinity, and oxygen concentration. This secondary chemocline persisted until August when it was detected at 4m depth. Pronounced vertical differences were also observed for heterotrophic flagellates, ciliates, rotifers, calanoid copepods, and growth rates of chemotrophic bacterioplankton. No strong correlation between the different components of the microbial loop was found, but phytoplankton primary production and ciliates numbers were tightly correlated (r 2 = 0.649, p<0.001). Compared to phytoplankton biomass (<200 mgC. m -2 ), the biomass of bacterioplankton in the epilimnion measured in autumn was more than one order of magnitude higher (up to 5,650 mgC. m -2 ) and chemoheterotrophic bacterial production exceeded photosynthesis by a factor of 7.1. By comparison, the biomasses of flagellates and ciliates remained very low throughout the year (maxima, 5.52 and 3.4 mgC. m -2 ) whereas that of the calanoid copepod Diaptomus connexus rose to unexpected high levels (681 mgC. m -2 ). parallel to the increase in biomass of aerobic chemoheterotrophic bacteria. Calanoid copepods represent the highest trophic level in the planktonic food web of this fishless lake. Taken together our results indicated an unusual pattern of carbon flow in Mahoney Lake. Maximum rates of carbon transfer." @default.
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- W99139022 date "1999-01-22" @default.
- W99139022 modified "2023-09-25" @default.
- W99139022 title "Structure of the aerobic food chain in a meromictic lake dominated by purple sulfur bacteria" @default.
- W99139022 doi "https://doi.org/10.1127/archiv-hydrobiol/144/1999/127" @default.
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