Institute of Ecology and Zoology Department, University of Georgia, Athens, Georgia 30602.
Appl Environ Microbiol. 1986 Dec;52(6):1317-23. doi: 10.1128/aem.52.6.1317-1323.1986.
Production by attached and free-living planktonic bacteria in two blackwater rivers in the Southeastern United States was measured over a period of 14 months by using the rate of incorporation of [methyl-H]thymidine into DNA. Production rates and biomass dynamics were compared to determine the potential for in situ production to supply planktonic biomass. Bacterial production in these rivers was moderate and varied seasonally. Rates varied from 0.058 to 2.120 mg of C m h in the Ogeechee River and from 0.002 to 2.418 mg of C m h in Black Creek. Regressions of growth rate on various environmental variables showed that temperature and total dissolved organic carbon concentration were the best predictors of growth. Although attached bacteria were <21% of the total biomass, they accounted for up to 53% of the total production. Turnover times for attached bacteria ranged from <1 day to >3 years depending on season. Turnover times of free-living bacteria varied from 4.4 days to 11.8 years. Comparisons of biomass with production indicated that during most seasons, the majority of bacterial biomass in these rivers was of allochthonous origin. During summer, when water temperatures were high, bacterial growth in the river may have supplied a greater percentage of the standing stock of bacteria than allochthonous inputs.
通过使用[甲基-H]胸苷掺入 DNA 的速率，在 14 个月的时间内测量了美国东南部两条黑水河中附着和自由生活的浮游细菌的生产力。比较了生产力和生物量动态，以确定原地生产为浮游生物量提供的潜力。这些河流中的细菌生产力适中，季节性变化。奥克赫奇河的速率从 0.058 到 2.120 mg C m h 不等，而黑溪的速率从 0.002 到 2.418 mg C m h 不等。生长率与各种环境变量的回归表明，温度和总溶解有机碳浓度是生长的最佳预测因子。尽管附着细菌仅占总生物量的<21%，但它们占总生产力的高达 53%。附着细菌的周转率根据季节的不同，从<1 天到>3 年不等。自由生活细菌的周转率从 4.4 天到 11.8 年不等。生物量与生产力的比较表明，在大多数季节，这些河流中的大部分细菌生物量均来自异源。在夏季，当水温较高时，河流中的细菌生长可能比异源输入提供了更大比例的细菌现存量。
