The history of cyanobacterial blooms in the Baltic Sea

Citation
T. Finni et al., The history of cyanobacterial blooms in the Baltic Sea, AMBIO, 30(4-5), 2001, pp. 172-178
Citations number
77
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Journal title
AMBIO
ISSN journal
0044-7447 → ACNP
Volume
30
Issue
4-5
Year of publication
2001
Pages
172 - 178
Database
ISI
SICI code
0044-7447(200108)30:4-5<172:THOCBI>2.0.ZU;2-S
Abstract
Long-term information on possible changes in cyanobacterial blooms in the B altic Sea, formed mainly by Nodularia spumigena and Aphanizomenon sp., was sought in published records in historical (years 1887-1938) and modern (yea rs 1974-1998) phytoplankton data sets. Old and new sampling methods and fix atives were tested to improve the comparison of data that had been collecte d and analyzed in different ways. A hundred years ago, plankton was mainly of interest as a source of fish food; eutrophication problems were only loc ally reported from the coast, mainly in southern haffs and the receiving wa ters 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 pe ak 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 mat erial. Since the 1960s, cyanobacterial blooms have been common in the open sea in both the Baltic proper and the Gulf of Finland, indicating high avai lability of nutrients.