title: Seasonal changes of nutrients and oxygen in the Bulgarian Black Sea coastal area.
abstract: The paper discusses the seasonal dynamics of nutrients and oxygen during the period 1995-1998 in comparison to the previous periods. This study is based on monthly and seasonally monitoring in the 3-20 n. m. zone along the Bulgarian Black Sea area. The investigation reveals certain shifting of seasonal maximums (minimums) and a trend of decreasing oxygen saturation, phosphorus and silicon in the last few years.
authors.affiliation: Institute of Oceanology, Bulgarian Academy of Science, Varna.
authors.forename: G
authors.initials: G
authors.lastname: Shtereva
authors.forename: A
authors.initials: A
authors.lastname: Krastev
authors.forename: O
authors.initials: O
authors.lastname: Hristova
mesh_terms: D002031:Bulgaria; D004784:Environmental Monitoring; D005068:Eutrophication; D009584:Nitrogen / Q000032:analysis*; D010100:Oxygen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012621:Seasons; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen