En helhetsbild av Lumparn-områdets status

D4 Published development or research report or study


Internal Authors/Editors


Publication Details

List of Authors: F. K. J. Eveleens Maarse
Publisher: Åbo Akademi, Forskningsrapporter från Husö biologiska station
Publication year: 2017
ISBN: 978-952-12-3494-1


Abstract

During the summer of 2016, a study was performed to create a complete
picture of the current situation and possible problems and solutions in
the Lumparn area, as assigned by the Åland provincial government. This
was done by gathering data and literature on Lumparn and its inlets from
a range of sources such as the fisheries agency and the water agency,
the government of Åland, and previous projects performed at Husö
biological station. The gathered data included water parameters, catches
from test fishing, vegetation cover and benthic fauna. The analyses
showed that the water quality was worst in the inner part of the inlets,
especially in Ämnäsviken and Kaldersfjärden, and gradually improved
closer to the Lumparn basin. This was supported by the vegetation,
benthic fauna and, to some extent,

the fish community data. All showed a difference in the community
composition between the Lumparn basin and the inlets. The probable
causes for this difference are eutrophication by an excess of nutrients
and difference in exposure between the basin and the inlets. In order to
determine the origin of the nutrients in the inlets, a more extensive
study is required. Additionally, this study found established bristly
stonewort (Chara horrida) in Mellanviken. Eelgrass (Zostera marina)
occurred in the established sites, Östra Lumparn and Ranksholm, with
increased coverage in Östra Lumparn compared to previous years, as well
as at the two new locations Skarven and Röda kon. Previous studies have
shown that the number of large individuals of zander (Sander lucioperca)
has decreased in Lumparn during the 2000s.


Last updated on 2019-09-12 at 02:36