NDLI: Environmental influence on the diatom and silicoflagellate assemblages in Koljö Fjord (Sweden) over the last two centuries

Content Provider	Springer Nature Link
Author	McQuoid, Melissa R. rdberg, Kjell
Copyright Year	2003
Abstract	Throughout the last century, the Swedish coasts, have been exposed to climatic variation and human influence, and this has altered the biota in some areas. Diatoms and silicoflagellates in a periodically-laminated sediment core from Koljö Fjord (Swedish west coast) were examined to assess recent changes in the microalgal community. The most notable changes in the plankton occurred at the beginning of a long period of water column stratification in the fjord that extended from 1930 to 1980. The planktonic flora changed from a community dominated byBacterosira bathyomphala andThalassionema nitzschioides during the 1800s to a community dominated byDetonula confervacea, T. nitzschioides, andThalassiosira spp. after 1930. Silicoflagellates, were more abundant after 1940. Planktonic variations corresponded to oscillations in climate, hydrography, and weather, which determine water column stability in the fjord. The tychopelagic species,Paralia sulcata, was more abundant in unlaminated sections of the core, indicating preference for a vertically mixed water column. No direct effects of increased nutrient loading on the plankton could be established. Epiphytic diatoms show a period of decline from the 1950s to 1990s. This trend probably follows a shift in the macroalgal community to less-suitable host species. To what extent this pattern has been influenced or reinforced by humans cannot be determined at the present time. The results from Koljö Fjord, in particular the exploration of meteorological and physical oceanographic influences on algal dynamics, emphasize the importance of distinguishing between natural and humaninduced changes in the environment.
Starting Page	927
Ending Page	937
Page Count	11
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	26
Issue Number	4
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Geosciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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