Kartering och habitatklassificering av undervattensmiljön i Lumparn 

D4 Published development or research report or study


Internal Authors/Editors


Publication Details

List of Authors: Linn Engström
Publisher: Åbo Akademi, Husö biologiska station
Publication year: 2018
Start page: 1
End page: 52
ISBN: ISBN 978-952-12-376-9


Abstract

During the summer of 2018, the underwater environment in Lumparn was
studied by mapping macrophytes and blue mussel colonies in the area. The
goal was to establish an overview of the distribution of species and
valuable habitats. The data was collected using drop-video at 205
locations and by mapping 12 transects by SCUBA diving. The collected
data was analysed using a habitat classification model which was
developed within the NANNUT-project. The model takes into consideration
habitat forming macrophytes, such as bladderwrack, eelgrass,
charophytes, vascular plants and red algae, but also blue mussels.
Factors that further influence the results include bottom substrate,
depth, exposure, total coverage of species and the occurrence of
threatened or rare species. Eelgrass (Zostera marina) was more abundant
and occurred in a larger number of locations than previously known. This
species is considered near threatened and contributes to many valuable
and vulnerable environments in the area. However, bladderwrack (Fucus
vesiculosus) occurred at the fewest sites compared to the rest of the
main habitats that NANNUT takes into consideration, and the bladderwrack
individuals appeared to be in bad condition. Blue mussels were more
abundant at the eastern side of Lumparn, where the environment is more
influenced by the outer archipelago and hard bottoms are more common.
Fast-growing annual filamentous algae were abundant, which poses a risk
to other flora and fauna by covering and eventually suffocating them.
These algae account for the main visible threat towards the different
valuable environments found in Lumparn. The high occurrence of
filamentous algae is likely a result of high nutrient contents in the
water. Subsequently, there are many valuable habitats and species in
Lumparn that require special attention, but they are threatened by
annual fast-growing filamentous algae.


Last updated on 2019-26-06 at 06:02