Rapport nr 103: Långtidsstudie av bottenfaunans utveckling I den Åländska skärgården – en jämförelse mellan åren 1973, 1989 och 2000
PERUS, J; LILJEKVIST, J; BONSDORFF, E (2001)
PERUS, J
LILJEKVIST, J
BONSDORFF, E
Åbo Akademi, Husö biologiska station
2001
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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:952-12-0826-0
https://urn.fi/URN:ISBN:952-12-0826-0
Tiivistelmä
In the summer 2000 about 60 sites in the Aland archipelago were analysed with regard to zoobenthos and hydrography. The stations had previously been studied in 1973 and 1989, and represent gradients from inner, sheltered bays to open coastal areas with a depth range from 1.5 to 30 m. The aim was to get a solid up-to-date baseline of the zoobenthic community and also to identify any changes that may have occurred between the sampling periods. Hydrography and sediment samples were analysed in order to interpretate possible changes.
The zoobenthos has undergone great changes during the period of study and the species composition on the different stations has changed. Abundance and biomass values were at their peak in the late 1980's and have decreased since, possibly due to decreased nutrient loadings. The number of species was genera/ly higher per station in 2000 than in 1989. A PCA-analysis identifies depth, salinity, tot-P and oxygen as being the parameters that mast strongly regulate the zoobenthos. The recently introduced polychaete, Marenzelleria viridis, has established itse/f in every part of the Aland archipelago.
The zoobenthos has undergone great changes during the period of study and the species composition on the different stations has changed. Abundance and biomass values were at their peak in the late 1980's and have decreased since, possibly due to decreased nutrient loadings. The number of species was genera/ly higher per station in 2000 than in 1989. A PCA-analysis identifies depth, salinity, tot-P and oxygen as being the parameters that mast strongly regulate the zoobenthos. The recently introduced polychaete, Marenzelleria viridis, has established itse/f in every part of the Aland archipelago.