Israel Oceanographic and Limnological Research, Yigal Alon Kinneret Limnological Laboratory, Migdal, Israel.
FEMS Microbiol Ecol. 2010 Mar;71(3):351-63. doi: 10.1111/j.1574-6941.2009.00822.x. Epub 2009 Nov 27.
Semi-annual averaged values of photosynthetic carbon fixation (PCF), community respiration (CR), bacterial productivity (BP) and zooplankton carbon biomass, measured biweekly or monthly, were used to obtain long-term estimates of bacterial respiration (BR) and bacterial growth efficiency (BGE) in Lake Kinneret from 2001 through 2007. We posited that CR=BR+phytoplankton respiration (PR)+zooplankton respiration (ZR). Based on the results of independent experimental series, PR was estimated as 0.3 x gross primary production (GPP) and GPP as 1.5 x PCF. ZR was determined by multiplying zooplankton carbon biomass, measured biweekly, with published respiration rates for major zooplankton groups. From these data, we calculated BR and consequently BGE, determined as BP/(BR+BP). Over the entire study period, BR averaged 49 (+/-10)% of CR and was consistently higher during the first half of the year. Semi-annual averaged BGE ranged from 26% to 53%, mean 39 (+/-9)%. Similar values of BGE were obtained if we did not use the measured values for ZR, but estimated BR+ZR from CR-PR and then assumed that BR ranged from two to three times ZR. The approach outlined in this paper can be useful for determining BGE in aquatic systems where long-term data sets of PCF, CR and BP are available.
我们使用 2001 年至 2007 年期间每两周或每月测量的光合碳固定（PCF）、群落呼吸（CR）、细菌生产力（BP）和浮游动物碳生物量的半年平均值，以获得对加利利海细菌呼吸（BR）和细菌生长效率（BGE）的长期估算。我们假设 CR=BR+浮游植物呼吸（PR）+浮游动物呼吸（ZR）。基于独立实验系列的结果，我们将 PR 估计为 0.3 x 总初级生产力（GPP），GPP 为 1.5 x PCF。ZR 通过将每周测量的浮游动物碳生物量与主要浮游动物群的公布呼吸率相乘来确定。根据这些数据，我们计算了 BR，从而确定了 BGE，其定义为 BP/（BR+BP）。在整个研究期间，BR 平均占 CR 的 49（+/-10）%，并且在上半年一直保持较高水平。半年度平均 BGE 范围从 26%到 53%，平均值为 39（+/-9）%。如果我们不使用 ZR 的实测值，而是根据 CR-PR 估算 BR+ZR，然后假设 BR 范围在 ZR 的两倍到三倍之间，则可以得到相似的 BGE 值。本文中概述的方法可用于确定具有可用 PCF、CR 和 BP 的长期数据集的水生系统中的 BGE。
