A study and comparative analysis of production characteristics of bacterio- and phytoplankton in Avacha Bay and in the southern region of the Far Eastern State Marine Biosphere Reserve (FEMBR) in Posyet Bay was carried out in summer, 2017. Bacterial production in the surface samples from these basins was similar, varying from 0.28 to 2.3 mg C/(day m3) for Avacha Bay and from 0.22 to 2.0 mg C/(day m3) for FEMBR, while the number of bacterioplankton cells was significantly higher at the FEMBR site, reaching 2.1 ×106 cells/mL. Evidence of hypoxia in the relief depressions of both water areas was noted. Bacterial oxygen consumption was found to be one of the main factors in development of hypoxia in Avacha Bay. Primary production in the surface samples and in the water column in both basins was comparable, but the concentration of chlorophyll a in the FEMBR southern region was more than an order of magnitude lower. This ratio resulted from absorption by other organisms of most of the produced microalgae biomass in the water column and a higher assimilation number, which increases from high to low latitudes. On the contrary, in Avacha Bay both high levels of primary production and a high concentration of chlorophyll a were noted, which indicated an intensive terrigenous influx of biogenic elements of a natural and anthropogenic nature.

中文翻译：

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2017年夏秋季阿瓦查湾及远东国家海洋生物圈保护区南部地区浮游细菌和浮游植物生产特征

2017 年夏季，对阿瓦查湾和远东国家海洋生物圈保护区 (FEMBR) 南部地区的浮游细菌和浮游植物的生产特征进行了研究和比较分析。这些盆地相似，Avacha Bay 为 0.28 至 2.3 mg C/(day m3)，FEMBR 为 0.22 至 2.0 mg C/(day m3)，而 FEMBR 站点的浮游细菌细胞数量明显更高，达到2.1 × 106 个细胞/毫升。注意到两个水域的减压洼地都存在缺氧迹象。发现细菌耗氧量是导致阿瓦查湾缺氧的主要因素之一。两个盆地的地表样品和水体中的初级产量相当，但 FEMBR 南部地区的叶绿素 a 浓度要低一个数量级以上。这个比率是由于其他生物吸收了水体中产生的大部分微藻生物量和较高的同化数，从高纬度到低纬度增加。相反，在阿瓦查湾发现了高水平的初级生产和高浓度的叶绿素 a，这表明自然和人为性质的生物元素大量涌入陆源。