Rapport nr 97: Kartering av makrofyter och drivande alger på grunda mjukbottnar i Ålands skärgård
BERGLUND, J (1998)
BERGLUND, J
Åbo Akademi, Husö biologiska station
1998
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This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:952-12-0255-6
https://urn.fi/URN:ISBN:952-12-0255-6
Tiivistelmä
Due to increasing nutrient levels the primary production has increased in the Baltic Sea. In many areas increased amounts of filamentous algae have been reported.
A survey of macrophytes and drifting algae was carried out in 1997 in the Åland archipelago. Altogether 11 shallow bays around the Åland mainland were investigated under the period July to September. The study includes species diversity, estimations of biomass and occurrence of drifting algal mats.
The coverage of macrophytes was estimated with a 50x50 cm frame and the biomass was estimated with a 35,64 cm2 sampling corer.
Altogether 37 different species of macrophytes were noted. The average biomass varied between 450 and 1300 g wetweight/m2 and 100 to 350 g dryweight/m2. The coverage and biomasses showed a high correlation with the Baardseth exposure-index. Drifting macoalgal mats occured at 10 of 13 localities examined.
A survey of macrophytes and drifting algae was carried out in 1997 in the Åland archipelago. Altogether 11 shallow bays around the Åland mainland were investigated under the period July to September. The study includes species diversity, estimations of biomass and occurrence of drifting algal mats.
The coverage of macrophytes was estimated with a 50x50 cm frame and the biomass was estimated with a 35,64 cm2 sampling corer.
Altogether 37 different species of macrophytes were noted. The average biomass varied between 450 and 1300 g wetweight/m2 and 100 to 350 g dryweight/m2. The coverage and biomasses showed a high correlation with the Baardseth exposure-index. Drifting macoalgal mats occured at 10 of 13 localities examined.