Marked early 20th century pollution and the subsequent recovery of Töölö Bay, central Helsinki, as indicated by subfossil diatom assemblage changes
✍ Scribed by Atte Korhola; Tom Blom
- Book ID
- 104614563
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 832 KB
- Volume
- 341
- Category
- Article
- ISSN
- 1573-5141
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✦ Synopsis
Diatoms were used to infer the trophic status history of a Baltic Sea inlet, T6616 Bay, located in central Helsinki . The waterbody received partially treated sewage effluent from the local sewage works and from a sugar factory from ca . 1890 until ca . 1960 when primary sewage treatment and the diversion of the effluent began . The increased nutrient input is shown in the diatom stratigraphy in the form of a rapid increase in planktonic eutrophic forms particularly Cyclotella cf. meneghiniana, and a reciprocal destruction of the periphytic flora . The overall diversity decreased markedly at this time . There is a gradual recovery of the system to the predisturbance conditions from 1960 onwards, as indicated by the re-emergence of the mesotrophic periphytic diatoms . Detrended correspondence analysis (DCA) is used to summarize the responses of the diatom assemblages to changing nutrient concentrations .