Abstract
Percent respiration was measured in over 1,100 arctic and subarctic marine water and sediment samples using14C-labeled glucose and glutamate. These measurements were made at different times of the year in 4 regions. Percent respiration values were typically lower in regions where the waters of large rivers mixed with seawater. They were also lower in sediments and in waters collected near the bottom than in surface waters. They were higher in winter arctic waters than water samples collected in the summer; however, a similar seasonal trend was not observed in subarctic waters. There were a number of studies in which there were significant positive rank correlations between percent respiration and salinity and between percent respiration and temperature. From what is known about the range of temperature and salinity encountered in samples collected during these studies and the results of temperature and salinity effects experiments, it was concluded that changes in these 2 variables did not explain the variation observed in percent respiration. Correlations between percent respiration and the inorganic nutrients PO4 −3, NH4 + and NO3 − showed that of the 3 variables, only NO3 − showed relatively high correlations with all the same sign. From this it was concluded that there may be situations in which NO3 − levels may influence percent respiration in nearshore marine waters. It is also likely that qualitative characteristics of the available organic nutrients may also influence percent respiration levels. Although no organic nutrient data is available for statistical analysis, the patterns of percent respiration near river plumes and the relatively strong negative correlation often observed between uptake rates (heterotrophic activity) and percent respiration suggests that organic nutrients may be a factor in controlling percent respiration. It is suggested that there are situations in which percent respiration measurements may be used to document stress in natural microbial populations due to nutrient deficiencies.
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Griffiths, R.P., Caldwell, B.A. & Morita, R.Y. Observations on microbial percent respiration values in arctic and subarctic marine waters and sediments. Microb Ecol 10, 151–164 (1984). https://doi.org/10.1007/BF02011422
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DOI: https://doi.org/10.1007/BF02011422