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Differences in regulation of planktonic and epilithic biofilm bacterial production in the middle reaches of a temperate river
Aquatic Microbial Ecology ( IF 1.4 ) Pub Date : 2021-06-17 , DOI: 10.3354/ame01968 K Tsuchiya 1 , A Kohzu 1 , VS Kuwahara 2 , SiS Matsuzaki 1 , M Denda 3 , K Hirabayashi 4
Aquatic Microbial Ecology ( IF 1.4 ) Pub Date : 2021-06-17 , DOI: 10.3354/ame01968 K Tsuchiya 1 , A Kohzu 1 , VS Kuwahara 2 , SiS Matsuzaki 1 , M Denda 3 , K Hirabayashi 4
Affiliation
ABSTRACT: To clarify the governing factors of planktonic and epilithic bacterial production (BP) and to quantify their relative contributions to the carbon cycle, we investigated the seasonal variation and regulatory factors of planktonic and epilithic BP in the middle reaches of the Shinano River, Japan, ecosystem from February 2019 to May 2020. Sampling was conducted at 3 stations: upper stream riffle, upper stream pool, and lower stream riffle, where current velocity, water depth, and bed shear stress were distinct. Planktonic and biofilm BP ranged from 5.5 to 466 mgC m-3 d-1 and 2.9 to 132 mgC m-2 d-1, respectively, showing clear seasonal variation. Biofilm BP was higher in the upper stream riffle than at the other stations, where no spatial variation in planktonic BP was observed. Generalized linear models suggest that BP was primarily regulated by water temperature. Additionally, planktonic BP was significantly correlated with dissolved organic carbon, suggesting carbon limitation. Biofilm BP showed no evidence of resource limitation (nutrients and organic matter), but was significantly explained by current velocity and station. The results suggest that although seasonality is dominant in biofilm BP variation, spatial differences are significant within the seasonal variability. Moreover, current velocity and bottom shear stress related to local geomorphologies such as riffles and pools affect substrate supply rate and biofilm formation processes, regulating biofilm BP variation. This study demonstrated different regulatory factors of planktonic and biofilm BP in the middle reaches of a temperate river.
中文翻译:
温带河流中游浮游生物膜细菌生成调控差异
摘要:为了阐明浮游和附石细菌产生 (BP) 的控制因素并量化它们对碳循环的相对贡献,我们调查了日本信浓川中游浮游和附石 BP 的季节性变化和调控因素。 , 生态系统 2019 年 2 月至 2020 年 5 月。 在 3 个站点进行采样:上游浅滩、上游池和下游浅滩,其中流速、水深和河床剪应力不同。浮游生物和生物膜 BP 范围为 5.5 至 466 mgC m -3 d -1和 2.9 至 132 mgC m -2 d -1,分别显示出明显的季节性变化。上游浅滩的生物膜 BP 高于其他站点,没有观察到浮游生物 BP 的空间变化。广义线性模型表明血压主要受水温调节。此外,浮游生物 BP 与溶解的有机碳显着相关,表明碳限制。生物膜 BP 没有显示资源限制(养分和有机物质)的证据,但可以通过当前的速度和站点进行显着解释。结果表明,虽然季节性在生物膜 BP 变化中占主导地位,但在季节性变化中空间差异是显着的。而且,与局部地貌(如浅滩和水池)相关的流速和底部剪应力影响底物供应率和生物膜形成过程,调节生物膜 BP 的变化。这项研究证明了温带河流中游浮游生物和生物膜 BP 的不同调节因素。
更新日期:2021-06-17
中文翻译:
温带河流中游浮游生物膜细菌生成调控差异
摘要:为了阐明浮游和附石细菌产生 (BP) 的控制因素并量化它们对碳循环的相对贡献,我们调查了日本信浓川中游浮游和附石 BP 的季节性变化和调控因素。 , 生态系统 2019 年 2 月至 2020 年 5 月。 在 3 个站点进行采样:上游浅滩、上游池和下游浅滩,其中流速、水深和河床剪应力不同。浮游生物和生物膜 BP 范围为 5.5 至 466 mgC m -3 d -1和 2.9 至 132 mgC m -2 d -1,分别显示出明显的季节性变化。上游浅滩的生物膜 BP 高于其他站点,没有观察到浮游生物 BP 的空间变化。广义线性模型表明血压主要受水温调节。此外,浮游生物 BP 与溶解的有机碳显着相关,表明碳限制。生物膜 BP 没有显示资源限制(养分和有机物质)的证据,但可以通过当前的速度和站点进行显着解释。结果表明,虽然季节性在生物膜 BP 变化中占主导地位,但在季节性变化中空间差异是显着的。而且,与局部地貌(如浅滩和水池)相关的流速和底部剪应力影响底物供应率和生物膜形成过程,调节生物膜 BP 的变化。这项研究证明了温带河流中游浮游生物和生物膜 BP 的不同调节因素。