Significance of Bacterial Exoenzymes in Organic Matter Cycling in the Antarctic Ocean

将初级生产者的碳与细菌偶联， 显著影响有机质垂直通量的格局 海洋中的物质。 因为细菌必须水解颗粒 在摄取之前，细菌外水解酶必须承担核心作用， 从颗粒有机物到微生物的碳通量 循环. 细菌外切水解酶的表达受 因此在沃茨中可能停止 耗尽了颗粒和聚合物。 在高纬度沃茨 在漫长的极地期间， 晚上 有待验证的假设是，在南极洲 冬季，细菌外切水解酶的生产停止。 因此，在早期阶段产生的颗粒和聚合物 春天的花朵不能被细菌利用。 外切水解酶是 当有机物积累到临界水平时表示; 因此，颗粒有机物和 细菌变得强大。 现场和实验室操作将 检查调节外切水解酶的环境线索 活动 这些知识应该有助于 了解生物生产机制和变异性 在南大洋有机物循环的路径中。

Coupling of carbon from primary producers to bacteria can significantly influence the patterns of vertical flux of organic matter in the ocean. Because bacteria must hydrolyze particles before uptake, bacterial exohydrolases must assume a central role in carbon flux from particulate organic matter into the microbial loop. The expression of bacterial exohydrolase is regulated by substrate concentration and therefore may cease in waters depleted of particles and polymers. In high latitude waters there is no phytoplankton production during the protracted polar night. The hypothesis to be tested is that during the Antarctica winter, the production of bacteria exohydrolase ceases. Therefore, particles and polymers produced during the early spring bloom cannot be utilized by bacteria. Exohydrolases are expressed when organic matter accumulates to a critical level; consequently, the coupling between particulate organic matter and bacteria becomes strong. Field and laboratory manipulations will examine environmental cues which regulate exohydrolase activities. This knowledge should contribute to the understanding of biological production mechanisms and variability in the pathways of organic matter cycling in the Southern Ocean.