Rapport nr 100: Förekomst av drivande alger och syrebrist i den nordvästra delen av Ålands skärgård
RÖNNBERG, C (2000)
RÖNNBERG, C
Åbo Akademi, Husö biologiska station
2000
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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:952-12-0590-3
https://urn.fi/URN:ISBN:952-12-0590-3
Tiivistelmä
The occurrence of drifting algal mats and hypoxia were investigated at 19 stations and along 5 transects in the archipelago of NW Atand in August and September 1999. The stations are genera/ly in the depth-range of 15 to 30 m, at exposed /ocalities as we/1 as more sheltered ones. There are no earlier investigations of the drift algal situation at these depths in this part of Atand, and the aim of this study was therefore to get a picture of occurrence, frequency and size of the disturbed areas.
The results show that oxygen conditions were in general good in the bottom water. Drift algae were found especially at more sheltered /ocalities, but a/so in the outer archipelago small patches were found. Two stations were revisited in September, 4-5 weeks after the first investigation and the results revealed that the amount of algae had increased and the oxygen situation had gotten worse.
Beside the main investigations, a two day survey of drifting algae and hypoxia in Lökho/msljärden, Föglö was conducted, and the area outside it was also nvestigated. These results are presented in Appendix 1.
The results show that oxygen conditions were in general good in the bottom water. Drift algae were found especially at more sheltered /ocalities, but a/so in the outer archipelago small patches were found. Two stations were revisited in September, 4-5 weeks after the first investigation and the results revealed that the amount of algae had increased and the oxygen situation had gotten worse.
Beside the main investigations, a two day survey of drifting algae and hypoxia in Lökho/msljärden, Föglö was conducted, and the area outside it was also nvestigated. These results are presented in Appendix 1.