Colonisation and bioerosion of marine bivalve shells from the Baltic Sea by euendolithic cyanobacteria: an experimental study

摘要: The destructive activity of different euendolithic cyanobacteria on marine bivalve shells typical for the Baltic Sea area, such as Mytilus edulis, Mya arenaria, Cerastoderma glaucum, and Macoma balthica, was studied in experimental settings four months. Specifically cyanobacterial strains Phormidium sp., Microcoleus chthonoplastes, Anabaena flos-aquae Synechococcus sp. – all which not classically considered were cultured under controlled conditions laboratory to determine their optimal environmental conditions. Each species maintained with calcium carbonate contents both sediment sea water. After months exposure, pieces collected, thin-sectioned, examined using scanning electron microscopy (SEM) light microscopy. chthonoplastes exhibited fastest (after two weeks) colonisation arenaria glaucum formed a dense biofilm systems decalcified sand carbonate-free Shells edulis colonised only sites where periostracum damaged suggesting periostracal protective properties against destruction substrate by dissolution bioerosion. examination SEM images cross-sections revealed be an active euendolith that produces prominent traces whereas signs boring inconclusive did contribute