Different interrelationships among phytoplankton, bacterial and environmental variables in dumping and reference areas in the East Sea

摘要: Approximately several hundred million tons of waste, composed mostly dredged materials and sewage sludge, are disposed annually in the world's ocean; millions waste dumped yearly into East Sea, Korea. To assess impacts such dumping on bacteria phytoplankton pelagic ecosystem, to understand mechanisms behind any observed changes, environmental, bacterial, variables reference areas Sea were measured 10 times from January 1996 August 1998. The effects also tested vitro by directly adding various types sea- water. Physicochemical characteristics as temperature, salinity, concentrations ammo- nium, nitrate, phosphate generally similar between areas; values bacterial biomass chlorophyll a 2 areas. However, higher or lower production (BP) primary (PP) fre- quently compared sites. Microbial ecological relationships (e.g. sea surface temperature vs. BP/PP ratio, nitrate concentration PP) significant at sites but not Comparisons environ- mental, phytoplankton, suggested that BP PP might be due disposal inhibitory substances. This infer- ence seemed supported waste-addition experiments, which thymidine incorporation rates inhibited >1% human animal wastes acid aminopeptidase activity was >5% waste. Thus, continual impose activities phyto- plankton waters area, stimulatory more diluted waters. Dumping organic ocean has potential affect functions marine ecosystem bottom level microbial food webs.