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Decrease in bacterial production over the past three decades in the north basin of Lake Biwa, Japan

机译：在日本湖博湾北部盆地过去三十年中减少了细菌产量

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摘要

In Lake Biwa, the largest lake in Japan, external pollutant loads have decreased since the 1980s, leading to improved water quality, such as reduction in biochemical oxygen demand (BOD) and PO43? concentrations. We examined long-term variation of bacterial production (BP) under these environmental changes from 2016–2017 in the north basin of Lake Biwa. BP was estimated by measuring the incorporation of stable isotope?15N-labeled deoxyadenosine (15N-dA) from June 2016 and December 2017?and compared with measurements from 1986 and 1997–1998. In 1986, BP was measured by following 3H-labeled thymidine (3H-TdR) incorporation and in 1997–1998 by tracking bacterial abundance in incubations and calculating specific growth rates (μ). To allow direct comparison of 15N-dA and 3H-TdR incorporation rates, we determined a conversion factor. To estimate μ in 2016–2017, we determined a factor for converting 15N-dA incorporation to cell number increase. In 2016–2017, the 15N-dA incorporation rate ranged from 0.13 to 30.7?pmol l?1?h?1 and μ ranged from 0.016 to 0.70 day?1. BP values from 3H-TdR incorporation rates in 1986 and μ in 1997–1998 were 4.6 and 2.1 times BP values in 2016–2017, respectively, confirming the decrease in BP over the past 3 decades in Lake Biwa. Water quality data showed only low decrease rates for BOD and total phosphorus concentration from the 1980s, whereas the rate of decrease for PO43? concentrations was equivalent to that of BP. BP and decomposition of organic matter are known to be strongly P-limited in Lake Biwa. Our results suggest that the decrease in BP can be explained by a reduction in readily bioavailable PO43?. Organic phosphorus can also be an important P-source for BP under conditions with very low PO43? concentrations (nM), and changes in the bioavailability of organic phosphorus might have also regulated BP dynamics.
机译：在Biwa湖中，日本最大的湖泊，自20世纪80年代以来，外部污染物负荷降低，导致水质提高，如减少生化氧需求（BOD）和PO43？浓度。我们在2016 - 2017年在博伊瓦北部盆地的2016-2017，在这些环境变化下检查了细菌产量（BP）的长期变化。通过测量2016年6月和2017年12月的稳定同位素（15N-DA）掺入稳定同位素的掺入估计BP估计？与1986年和1997-1998的测量相比。 1986年，通过跟踪在孵育中的细菌丰度和计算特异性生长速率（μ），通过在3H标记的胸苷（3H-TDR）掺入和1997-1998中来测量BP。为了允许直接比较15N-DA和3H-TDR掺入率的速率，我们确定了转换因子。为了估算μ2016 - 2017年，我们确定了将15n-da掺入到细胞数增加的因素。在2016 - 2017年，15N-DA掺入率范围为0.13至30.7？PMOL L？1？1和μ范围为0.016至0.70天？1。 1986年1986年的3H-TDR融合率的BP值分别于1997-1998的2016-2017次为4.6％和2.1倍BP值，确认BP在博伊瓦湖过去3年中的BP减少。水质数据仅显示了20世纪80年代的BOD和总磷浓度的低降低率，而PO43的降低率？浓度相当于BP的浓度。已知有机质的BP和分解在Biwa湖中强烈的P限制。我们的研究结果表明，BP的减少可以通过易于生物可利用的PO43减少来解释？有机磷也可以是BP在非常低的PO43的条件下的重要p源？浓度（NM）和有机磷的生物利用度的变化可能还调节了BP动力学。

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  • 来源
    《Limnology》 |2020年第1期|共10页
  • 作者

    Kenji Tsuchiya; Noriko Tomioka; Tomoharu Sano; Ayato Kohzu; Kazuhiro Komatsu; Akio Imai; Kazuhide Hayakawa; Takamaru Nagata; Takahiro Okamoto; Yoshinori Hirose;

  • 作者单位

    1grid.140139.e0000 0001 0746 5933National Institute for Environmental Studies16-2 Onogawa305-8506TsukubaIbarakiJapan;

    1grid.140139.e0000 0001 0746 5933National Institute for Environmental Studies16-2 Onogawa305-8506TsukubaIbarakiJapan;

    1grid.140139.e0000 0001 0746 5933National Institute for Environmental Studies16-2 Onogawa305-8506TsukubaIbarakiJapan;

    1grid.140139.e0000 0001 0746 5933National Institute for Environmental Studies16-2 Onogawa305-8506TsukubaIbarakiJapan;

    1grid.140139.e0000 0001 0746 5933National Institute for Environmental Studies16-2 Onogawa305-8506TsukubaIbarakiJapan;

    1grid.140139.e0000 0001 0746 5933National Institute for Environmental Studies16-2 Onogawa305-8506TsukubaIbarakiJapan;

    2grid.416629.e0000 0004 0377 2137Lake Biwa Environmental Research Institute5-34 Yanagasaki520-0022OtsuShigaJapan;

    2grid.416629.e0000 0004 0377 2137Lake Biwa Environmental Research Institute5-34 Yanagasaki520-0022OtsuShigaJapan;

    2grid.416629.e0000 0004 0377 2137Lake Biwa Environmental Research Institute5-34 Yanagasaki520-0022OtsuShigaJapan;

    2grid.416629.e0000 0004 0377 2137Lake Biwa Environmental Research Institute5-34 Yanagasaki520-0022OtsuShigaJapan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 湖泊、水库;淡水生物;
  • 关键词

    Bacterial production; Lake Biwa; Biochemical oxygen demand; Total organic carbon; Phosphate;

    机译：细菌生产;琵琶湖;生物化学需氧量;总有机碳;磷酸盐;

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