Bacterioplankton monitoring in the Gulf of Bothnia (1989-)

The project is a part of a larger monitoring programme; Intensive Monitoring of the Pelagic Environment. The objective is to follow long-term trends in the biomass production and abundance of the bacterioplankton as a measurement of the trophic status of the ecosystem. Bacterial biomass production is further an important part of the ecosystems secondary production, an indirect measurement of the biological respiration, and thereby the ecosystem oxygen demand. The bacterial growth and abundance are monitored at one coastal station and two open sea stations. The sampling is made bi-weekly during the period May-September and June-September in the Bothnian Bay. In October-January the samplings are made once every month. Data from simultaneous sampling for water physics/chemistry are stored at the Swedish Meteorological and Hydrological Institute, SMHI.

本项研究为更大规模监测计划——海洋浮游生物密集监测项目的一部分。其宗旨在于追踪生态系统营养状态变化的长期趋势，具体体现在对浮游细菌生物量生产和丰度的监测上。细菌生物量的生产是生态系统次级生产的重要组成部分，它间接反映了生物呼吸作用，从而衡量了生态系统的氧气需求。细菌的生长和丰度在沿海一站及两座开放式海洋站进行监测。采样活动于每年五月至九月以及六月至九月，在波的尼亚湾进行，每两周一次。而在十月至次年一月，则每月进行一次采样。同时进行的水文物理/化学采样数据则存储于瑞典气象水文研究所（SMHI）。