Seasonal Variation of Antifouling Activities of Marine Algae from the Brittany Coast (France)

• DOI: 10.1007/s10126-003-0020-x
• Publication Date: 2004-03-20T03:11:08Z
• Authors: Claire Hellio; Jean-Philippe Mar...; Beno�t V�ron; Graham Bremer; Anthony S. Clare; Yves Le Gal
• Keywords: Diatoms; 0106 biological sciences; Antifungal Agents; Copper Sulfate; Bacteria; Monophenol Monooxygenase; Thoracica; /dk/atira/pure/core/subjects/biology; Eukaryota; 01 natural sciences; Anti-Bacterial Agents; Bivalvia; Biological Factors; 13. Climate action; Biofilms; Larva; Animals; Seawater; France; Seasons; 14. Life underwater; Trialkyltin Compounds; Biology

The antifouling activity of extracts (aqueous, ethanol, and dichloromethane) of 9 marine macroalgae against bacteria, fungi, diatoms, macroalgal spores, mussel phenoloxidase activity, and barnacle cypris larvae has been investigated in relation to season in bimonthly samples from the Bay of Concarneau (France). Of the extracts tested, 48.2% were active against at least one of the fouling organisms, and of these extracts, 31.2% were seasonally active with a peak of activity in summer corresponding to maximal values for water temperature, light intensity, and fouling pressure, and 17% were active throughout the year. This seasonal activity may be adaptive as it coincides with maximal fouling pressure in the Bay of Concarneau. Dichloromethane extracts of Rhodophyceae were the most active in the antifouling assays.