Diatom assemblages in superficial sediments from the Gulf of Riga,eastern Baltic Sea |
| |
Authors: | Sakson Maire Miller Urve |
| |
Affiliation: | (1) Institute of Geology, Estonian Academy of Sciences, Estonia Avenue 7, EE-0105 Tallinn;(2) Department of Quaternary Research, Stockholm University, Odengatan 63, S-113 22 Stockholm, Sweden |
| |
Abstract: | Twenty one superficial sediment samples from areas of high and moderate eutrophication in the Gulf of Riga were studied with respect to siliceous microfossils, mainly diatoms.The results seem to imply that the number of taxa and the abundance of the frustules are affected by runoff from rivers and the degree of eutrophication in different parts of the Gulf. Areas with high eutrophication, e.g. the river estuaries, have diatom assemblages of varying composition, while in areas with moderate eutrophication the composition is almost constant and the influx of freshwater diatoms and littoral periphyton small. The high abundance and low diversity of brackish-marine and brackish, planktonic diatoms seem to be a result of an influx of nutrients and pollutants in the water and bottom sediments. The sea ice diatoms occurring in the Baltic waters and also in the Gulf of Riga tend to be resistant to eutrophication or are even favoured by it. |
| |
Keywords: | diatoms eutrophication sediments Gulf of Riga Baltic Sea |
本文献已被 SpringerLink 等数据库收录! |
|