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Botanica Marina

Editor-in-Chief: Dring, Matthew

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Reproduction, Recruitment and Geographical Distribution of Fucus serratus L. in the Baltic Sea

T. Malm / L. Kautsky / R. Engkvist

Citation Information: Botanica Marina. Volume 44, Issue 2, Pages 101–108, ISSN (Print) 0006-8055, DOI: 10.1515/BOT.2001.014, June 2005

Publication History

Published Online:


This paper describes the large-scale geographical distribution, population structure, and reproductive season of the brown algae Fucus serratus L. in the Baltic proper. We have also experimentally tested fertilisation success and germination of F. serratus zygotes in a salinity gradient with the aim of finding out whether an adaptation to reduced salinity has occurred. Fucus serratus was found to be belt-forming along the shores of southeastern Sweden and scattered populations were found up to the middle of the Baltic proper. The ratio of non-reproductive (juvenile) plants per reproductive (adult) plant decreased significantly from 37 ± 8 S. E. in the south to 0.4 ± 0.2 in the north. Fucus serratus was reproductive during October to November on the mainland coast, while the populations on the southeast coast of Öland were reproductive during June to July. Laboratory experiments showed that successful fertilisation of Baltic F. serratus zygotes decreased drastically from 86.9 ± 1.0% S. E. at 9 psu to 5.5 ± 0.5% S. E. at 6 psu. Fucus serratus zygotes from the western coast of Sweden needed a significantly higher salinity for successful fertilisation than the Baltic gametes did, and at 8 psu, only a few eggs were fertilised (5.5 ± 0.5% S. E.). Since a relatively high proportion (35 %) of the Baltic F. serratus zygotes germinated in 7 psu, (the salinity at the northernmost populations) we discuss other factors such as ice-scraping and eutrophication as possible factors limiting the geographical and vertical distribution of the species in the Baltic Sea.

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