Rapport nr 134: Kartering av makrofyter, framtagandet av en klassificeringsmetod för att kunna beräkna ekologisk status för Ålands skärgård och skapandet av ett miljöövervakningsprogram
HOLGERSSON, E (2013)
HOLGERSSON, E
Åbo Akademi, Husö biologiska station
2013
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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:978-952-12-2858-2
https://urn.fi/URN:ISBN:978-952-12-2858-2
Tiivistelmä
By assignment of the provincial Government of Åland Islands a survey of macrophytes was carried out in the summer of 2012 to assess the ecological status of the Åland Islands’ water area. A survey was made at twelve sites scattered in the Åland archipelago, where depth distribution of macrophytes was observed using SCUBA divers along 50 m long transects that were positioned at an angle from the shoreline. The depth distribution of macrophytes was used to estimate the ecological status of the water bodies. To estimate the ecological status of the water bodies and the monitoring areas Finnish and Swedish methods were compared and evaluated. Both methods were found unsatisfying and a new method was developed. The water bodies of Åland were classified with data from this survey and with data from previous macrophyte surveys in the archipelago. When classifying the Åland waters monitoring areas with the new method two out of 14 areas were classified as good, 11 as moderate and one as unsatisfying. Additionally, a proposal on a monitoring program was also formed. To successfully monitor and detect changes in the ecological situation of the Åland Islands it is proposed that 30 sites are to be visited in furture surveys. The sites are to be divided into four groups with one annual group with six sites that are to be visited every year to detect annual variations. The remaining 24 sites are divided into three groups and each group are to be visited every third year. The data and classification from this survey is a contribution to the overall classification with all quality factors that describe the ecological situation of the Åland Island waters.