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Jan Karlsson

Monitoring the phytobenthos of the Swedish west coast

Abstract: The algal vegetation of the phytal zone is important in structuring the sublittoral communities of the rocky shores. The macroalgal community of the phytal zone at the Swedish west coast is since 1993 a part of the national monitoring programme. Depth ranges and the degree of coverage of the dominating algae are measured once a year using stereo photography along randomly placed transects at 6 localities close the Gullmar fjord area. The photo slides are transferred to CD-ROM media and the different taxa are then quantified using image analysis software.

Contact person(s): Jan Karlsson

Grants: Swedish Environmental Protection Agency.

The marine flora of the Swedish west coast

The Swedish west coast (the E Skagerrak, the E Kattegat) represents a transitional area between the fully marine Atlantic Ocean and the brackish Baltic Sea. Changes in the phytobenthic communities attributed to antropogenic pollution, including eutrophication, have occurred in some areas over the last 20 years. As a result, there has been a growing insight of the need baseline data. The sections below present results of surveys of the marine benthic macroflora of the province of Halland (E Kattegat) and the province of Bohuslän (E Skagerrak)

The marine algae of the province of Halland (E Kattegat) This section presents the results of surveys of the marine benthic macroflora of the province of Halland (E Kattegat)

The marine algae of the province of Bohuslän (E Skagerrak) This section presents the results of surveys of the marine benthic macroflora of the province of Bohuslän (E Skagerrak)

The distribution of japweed - Sargassum muticum - in Sweden 1996

Abstract: The arrival of the brown alga Sargassum muticum and the subsequent expansion at the Swedish west coast represents one of the most dramatic changes in the upper sublittoral during this century. In the present study sampling areas visited in 1993 together with some new, were revisited to obtain data of the current population status. Attached populations of S. muticum were found from the Norwegian border to the middle part of the province of Halland. The number of populations and population sizes decrease when going south. However, the number of new sites, as well as population numbers still increase. Continuous populations are common in the northern part of the county of Bohuslän, and isolated localities can now be found in the inner parts of the archipelagoes. Localities, showing high population numbers as well as very tall (to 4 m) and wide plants, were recorded close to the Ringhals nuclear power plant, Halland. No morphological differences were seen between plants from the more saline Skagerrak and the more brackish Kattegat.

Contact person(s): Jan Karlsson

Grants: World Wide Fund for Nature (WWF).

Collaboration: Lars-Ove Loo, Dept. of Marine Ecology (TMBL), Göteborg University.

 

 

 

 

Jan.Karlsson@marbot.gu.se