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Dynamics and biogeochemical significance of the physical environment in Lake Biwa

机译：琵琶湖自然环境的动力学和生物地球化学意义

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We have examined two aspects of the dynamics and biogeochemical significance of the physical environment in Lake Biwa. One is the horizontal distribution of cyanobacteria as it relates to the 'first gyre' in the north basin of Lake Biwa. We could easily measure the first gyre using a vessel-mounted acoustic doppler currents profiler. We were able to quantify the dynamics of the horizontal and vertical structure of currents and water temperature of this gyre. The first gyre did not remain at a fixed position; it moved north and south according to the growth of the gyre. This may play a role in the redistribution of cyanobacteria from place to place in the north basin. The second important environmental dynamic we measured was oxygen consumption rates from 1994 to 2000. We found that the minimum oxygen concentration in the hypolimnion has a clear inverse relationship with the apparent oxygen consumption rates in the 80-85 m depth layer. As a reduction in oxygen concentration in the hypolimnion can have a serious impact on benthic organisms, we concluded that the Lake Biwa environment should be monitored carefully and systematically.
机译：我们研究了琵琶湖自然环境的动力学和生物地球化学意义的两个方面。一个是蓝藻的水平分布，因为它与琵琶湖北部盆地的“第一回旋”有关。我们可以使用船载声多普勒电流剖面仪轻松测量第一个回旋。我们能够量化该旋流的水流和水温的水平和垂直结构的动力学。第一回旋器没有保持在固定位置。它根据回旋的增长而向南和向北移动。这可能在北部盆地各处的蓝细菌的重新分布中起作用。我们测量的第二个重要的环境动力学是1994年至2000年的耗氧率。我们发现，次生水层中的最低耗氧量与80-85 m深度层的表观耗氧率有着明显的反比关系。由于下层动物中氧气浓度的降低可能对底栖生物产生严重影响，因此我们得出结论，应该仔细系统地监测琵琶湖的环境。

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