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Apical Growth-measurements of Fucus vesiculosus L.: Limited Value in Monitoring

In monitoring the marine ecosystem, the search to find simple and universal methods has led to selected species being commonly used as indicator organisms. In the Baltic Sea, the bladder wrack (Fucus vesiculosus L., Phaeophyceae), the only broadly distributed perennial macroalga, is commonly used in monitoring the state of the coastal ecosystem. One parameter used is growth measured as apical tip length. The possible utility of apical growth of E vesiculosus as an indicator of environmental stress in relation to withinand between-plant variation, withinand between-site variation, and between habitat (wave exposed vs. sheltered) variation was tested in the northern Baltic Sea. The analysis showed that variation within plants, among plants within a single site, and among sites of similar wave exposure was significant. Although the difference between exposures also was important, the apical growth of R vesiculosus should not, without great caution, be used as a measure of environmental condition.