Finni T, Kononen K, Olsonen R, Wallström K
Maj and Tor Nessling Foundation, Fredrikink. 20 B 16, FIN-00120 Helsinki, Finland.
Ambio. 2001 Aug;30(4-5):172-8.
Long-term information on possible changes in cyanobacterial blooms in the Baltic Sea, formed mainly by Nodularia spumigena and Aphanizomenon sp., was sought in published records in historical (years 1887-1938) and modern (years 1974-1998) phytoplankton data sets. Old and new sampling methods and fixatives were tested to improve the comparison of data that had been collected and analyzed in different ways. A hundred years ago, plankton was mainly of interest as a source of fish food; eutrophication problems were only locally reported from the coast, mainly in southern haffs and the receiving waters of larger cities. There were few recordings of open-sea blooms before World War II. Abundances of Nodularia spumigena and Aphanizomenon sp. were low in the old material, and 137 summer samples from 1887-1938 showed no peak abundance. High abundances are common in the new material, and the range of the numbers of both taxa has increased markedly relative to the old material. Since the 1960s, cyanobacterial blooms have been common in the open sea in both the Baltic proper and the Gulf of Finland, indicating high availability of nutrients.
通过历史（1887 - 1938年）和现代（1974 - 1998年）浮游植物数据集的已发表记录，探寻波罗的海蓝藻水华可能变化的长期信息，这些水华主要由泡沫节球藻和束丝藻形成。对新旧采样方法及固定剂进行了测试，以改进对以不同方式收集和分析的数据的比较。一百年前，浮游生物主要作为鱼类食物来源受到关注；富营养化问题仅在沿海地区有局部报道，主要在南部半咸水区域和大城市的受纳水体。二战前公海水华的记录很少。旧材料中泡沫节球藻和束丝藻的丰度较低，1887 - 1938年的137个夏季样本未显示出丰度峰值。新材料中高丰度很常见，且这两个分类单元的数量范围相对于旧材料有显著增加。自20世纪60年代以来，蓝藻水华在波罗的海主体和芬兰湾的公海都很常见，这表明营养物质的高可用性。
