Accumulation of glucose and protein hydrolysate by natural populations of microorganisms in the Black Sea and Atlantic Ocean

Accumulation rate of dissolved organic matter (DOM) by natural populations varies over a wide range. In the surface layer of the Black Sea accumulation rate of glucose is 0.6-4.82 mg C/m**3 per day, and in the Atlantic Ocean 1.15-12.38 mg C/m**3 per day. This rate is 2-17 times higher when hydrolysate is added to the medium. Accumulation rate of glucose and hydrolysate in the aphotic layer of the Black Sea and the Atlantic Ocean is 1.5-6 times lower than at the surface. The organotrophic coefficient also varied within wide range. Relative amount of DOM used by microorganisms for growth in total production is much less (0.6-39.9%) in areas of intensive photosynthesis than in waters poor in DOM (83.7-99.2%).

自然种群对溶解有机物（dissolved organic matter, DOM）的积累速率分布跨度极大。在黑海表层水体中，葡萄糖的积累速率为0.6~4.82 mg C/m³·天，大西洋海域的葡萄糖积累速率则介于1.15~12.38 mg C/m³·天之间。当培养基中添加水解液时，该积累速率可提升2~17倍。黑海与大西洋的无光层内，葡萄糖及水解液的积累速率较表层水体低1.5~6倍。异养系数（organotrophic coefficient）的波动范围同样较为宽泛。在光合作用旺盛区域，微生物用于生长的溶解有机物在总生产量中的占比仅为0.6%~39.9%，远低于溶解有机物匮乏水域的83.7%~99.2%。