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Macroalgal diversity along the Baltic Sea salinity gradient challenges Remane's species-minimum concept |
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| Authors: | Schubert Hendrik Feuerpfeil Peter Marquardt Ronny Telesh Irena Skarlato Sergei |
| Institution: | a University of Rostock, Institute of Biological Sciences, Department of Ecology, Albert-Einstein-Str. 3, D-18051 Rostock, Germany b Zoological Institute, Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia c Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, 194064 Saint Petersburg, Russia |
| Abstract: | Remane’s species-minimum concept, which states that the lowest number of taxa occurs at the horohalinicum (5-8 psu), was tested by investigating macroalgal diversity on hard substrates along the natural salinity gradient in the Baltic Sea. Field data on species occurrence and abundance were collected by SCUBA diving along 10 transects of the Finnish, Swedish and German coasts, covering a salinity range from 3.9 to 27 psu. Macroalgal species numbers declined steadily with salinity, decreasing until 7.2 psu was reached, but in the horohalinicum, a marked reduction of species number and a change in diversity were indicated by the Shannon index and evenness values. The non-linear decrease in macroalgal diversity at 5-8 psu and the lack of increase in species numbers at salinities below 5 psu imply a restricted applicability of Remane’s species-minimum concept to macroalgae. |
| Keywords: | Baltic Sea Horohalinicum Macroalgae Salinity gradient Species diversity |
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