Rapport nr 128: Kartering av vattenväxterna och klassicifering av sjöarna Markusbölefjärden, Långsjön, Lavsböle träsk enligt EU:s ramdirektiv för vatten
BYSTEDT, S (2011)
BYSTEDT, S
Åbo Akademi, Husö biologiska station
2011
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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:978-952-12-2548-2
https://urn.fi/URN:ISBN:978-952-12-2548-2
Tiivistelmä
The EU Water Framework Directive (WFD, 2000/60/EC) aims to maintain and enhance the quality of aquatic environments within the EU. The status of the water resources should be at
least good by 2015. WFD-supervision, including fish, benthic fauna, macrophytes and prioritized substances, is required for lakes used for major outtake of drinking water. The aim of this study was to initiate a WFD-classification of lakes based on aquatic vegetation. Three lakes, Markusbölefjärden, Långsjön and Lavsböle träsk, in the Åland Islands were surveyed for aquatic vegetation and classified according to them in summer 2010. The studied lakes are
naturally nutrient rich and calcareous (RrRk). Ten transects were mapped for each lake by using an aquascope and a rake. Hydrographical data were also used in the assessment. Vascular plants, water mosses and stoneworts were included in the classification. The
ecological status of the lakes was calculated with help of the three indices; TT50SO, PMA and RI. The final status was calculated as the median of the EQR received from each index. Lake Lavsböle träsk achieved good ecological status, while lake Markusbölefjärden was classified as moderate status and Långsjön as bad status. Anoxic conditions were periodically observed in the bottom water layer of all three lakes. A proposal for a future monitoring program of vegetation in lakes is also given.
least good by 2015. WFD-supervision, including fish, benthic fauna, macrophytes and prioritized substances, is required for lakes used for major outtake of drinking water. The aim of this study was to initiate a WFD-classification of lakes based on aquatic vegetation. Three lakes, Markusbölefjärden, Långsjön and Lavsböle träsk, in the Åland Islands were surveyed for aquatic vegetation and classified according to them in summer 2010. The studied lakes are
naturally nutrient rich and calcareous (RrRk). Ten transects were mapped for each lake by using an aquascope and a rake. Hydrographical data were also used in the assessment. Vascular plants, water mosses and stoneworts were included in the classification. The
ecological status of the lakes was calculated with help of the three indices; TT50SO, PMA and RI. The final status was calculated as the median of the EQR received from each index. Lake Lavsböle träsk achieved good ecological status, while lake Markusbölefjärden was classified as moderate status and Långsjön as bad status. Anoxic conditions were periodically observed in the bottom water layer of all three lakes. A proposal for a future monitoring program of vegetation in lakes is also given.