Seasonal variability and regulation of bacterial production in a shallow eutrophic lake
Seasonal variability and regulation of bacterial production in a shallow eutrophic lake
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浅层富营养化湖泊细菌产生的季节变化和调节
DOI：
10.1002/lno.11196
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发表时间：
2019
影响因子：
4.5
通讯作者：
Akio Imai
中科院分区：
文献类型：
--
作者：
Kenji Tsuchiya;Tomoharu Sano;Noriko Tomioka;Ayato Kohzu;Kazuhiro Komatsu;Ryuichiro Shinohara;Noriko Takamura;Megumi Nakagawa;Youta Sugai;VIctor S. Kuwahara;Tatsuki Toda;Hideki Fukuda;Akio Imai
从2012年到2016年，阐明了浅水富营养化霞浦湖细菌产量（BP）的季节变化。在研究期间，血压在1.9至138μg C L−1d−1之间波动。在任何季节，BP和细菌丰度之间都没有显著的相关性，这表明全年BP都有很强的自上而下的调节。另一方面，BP也与自下而上的调节因素有关，如水温，磷和初级生产力（PP）。在冬季，BP与叶绿素浓度呈正相关，表明本地基质对BP相对重要。此外，BP与异养nanoflagellates，纤毛虫，桡足类呈正相关，这表明BP的底物更高的可用性。在夏季，虽然BP和PP之间没有显著的相关性，但降雨量与BP和PP均呈显著的负相关，这表明相对较低的太阳辐照度和不利的天气条件降低了细菌的底物供应，从而降低了PP。这些结果表明，BP的时间变化的调节不是由外来的，但在最高（夏季）和最低（冬季）生产季节，即使在浅，富营养化的湖泊由本地基板。PP在秋季约为春季的一半，由于较低的太阳辐照度，虽然两个季节的水温相似，秋季营养盐浓度较高。另一方面，秋季的BP与春季相当，细菌碳需求（= BP +细菌呼吸; 1.12 ± 0.79 g Cm −2d−1）与PP（1.16 ± 0.53 g Cm −2d−1）相当，表明相对于其他季节，较高的外来基质相对重要。
The seasonal variation of bacterial production (BP) in a shallow, eutrophic Lake Kasumigaura was clarified from 2012 to 2016. During the studied period, BP fluctuated from 1.9 to 138μg C L−1d−1. There were no significant correlations between BP and bacterial abundance in any season, suggesting a strong top‐down regulation on BP throughout the year. On the other hand, BP was also related to bottom‐up regulation factors such as water temperature, phosphorus, and primary production (PP) annually. During winter, BP was positively correlated with chlorophyllaconcentration, suggesting that autochthonous substrates were relatively important for BP. Moreover, BP was positively correlated with heterotrophic nanoflagellates, ciliates, and copepods, suggesting higher availability of substrates for BP. In summer, although there was no significant correlation between BP and PP, rainfall amount showed significant negative correlations with both BP and PP, suggesting depressed PP from relatively lower solar irradiance coupled with unfavorable weather conditions that decreased the substrate supply for bacteria. These results suggest that temporal variation of BP was regulated not by allochthonous, but by autochthonous substrates during both the highest (summer) and lowest (winter) productive seasons, even in a shallow, eutrophic lake. PP in autumn was approximately half that of spring due to lower solar irradiance, although water temperatures during both seasons were similar and nutrient concentrations during autumn were higher. On the other hand, BP in autumn was comparable with that in spring, and the bacterial carbon demand (= BP + bacterial respiration; 1.12 ± 0.79 g C m−2d−1) was comparable to PP (1.16 ± 0.53 g C m−2d−1), suggesting the relative importance of higher allochthonous substrates relative to other seasons.