1. Allelopathic effects of diatom filtrates on the toxic benthic dinoflagellate Ostreopsis cf. ovata
- Author
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Laura Pezzolesi, Salvatore Pichierri, Cecilia Totti, Rossella Pistocchi, Stefano Accoroni, Tiziana Romagnoli, Franca Guerrini, Salvatore, Pichierri, Stefano, Accoroni, Laura, Pezzolesi, Franca, Guerrini, Tiziana, Romagnoli, Rossella, Pistocchi, and Cecilia, Totti
- Subjects
0106 biological sciences ,Harmful Algal Bloom ,010501 environmental sciences ,Aquatic Science ,Oceanography ,medicine.disease_cause ,Cell morphology ,01 natural sciences ,Skeletonema marinoi ,Botany ,parasitic diseases ,medicine ,Allelopathy ,0105 earth and related environmental sciences ,Diatoms ,biology ,Diatoms Allelopathy Harmful algae Benthic dinoflagellates Toxicity Genotoxicity ,010604 marine biology & hydrobiology ,fungi ,Dinoflagellate ,General Medicine ,Plankton ,biology.organism_classification ,Pollution ,Diatom ,Benthic zone ,Dinoflagellida ,Marine Toxins ,Genotoxicity ,Environmental Monitoring - Abstract
Ostreopsis blooms regularly occur in many Mediterranean coastal areas in late summer-autumn. In the northern Adriatic Sea, Ostreopsis blooms affect diatom-dominated microphytobenthic communities. In this study, the effects of the filtrates of some diatom species, both benthic (Tabularia affinis, Proschkinia complanatoides and Navicula sp.) and planktonic (Thalassiosira sp. and Skeletonema marinoi) on cell morphology, cytological features and growth of O. cf. ovata were investigated. Our results showed a marked decrease of O. cf. ovata growth when cells were exposed to all diatom filtrates tested. The highest inhibitions were observed for exposures to P. complanatoides and Navicula sp. filtrates (92.5% and 80%, respectively) and increased with the age of diatom culture. Moreover, a clear DNA degradation and abnormal forms of O. cf. ovata cells (83.8% of the total) were found at the highest concentrations using Navicula sp. filtrate after 10 days of the inoculum.
- Published
- 2017