Epiphytic diatom assemblages on invasive Caulerpa taxifolia and autochthonous Halimeda tuna and Padina sp. seaweeds in the Adriatic Sea – summer/autumn aspect

Ana Car, Andrzej Witkowski, Sławomir Dobosz, Nenad Jasprica, Stijepo Ljubimir, Izabela Zgłobicka

Paper category: Original research paper
Corresponding author: Ana Car (ana.car@unidu.hr)
DOI: 10.2478/ohs-2019-00019
Received: 14/11/2018
Accepted: 28/01/2019
Full text: here

Citation (APA style): Car, A., Witkowski, A., Dobosz, S., et al. (2019). Epiphytic diatom assemblages on invasive Caulerpa taxifolia and autochthonous Halimeda tuna and Padina sp. seaweeds in the Adriatic Sea – summer/autumn aspect. Oceanological and Hydrobiological Studies, 48(3), pp. 209-226. Retrieved 3 Oct. 2019, from doi:10.2478/ohs-2019-0019


This study focuses on the taxonomy of epiphytic diatoms in the area of invasive macroalgae from the genus Caulerpa. Caulerpa species are characterized by the presence of secondary metabolites, such as caulerpenyne (CYN), the main function of which is a chemical defense mechanism against herbivores and epiphytes. Epiphytic diatoms were studied on fronds of Caulerpa taxifolia (“killer seaweed”) and, for comparison, on autochthonous macroalgae Padina sp. and Halimeda tuna at the eastern Adriatic Sea coast (Island of Hvar) in the summer and autumn of 2010. The qualitative analysis was performed with the use of light and scanning electron microscopy. The Shannon–Wiener Diversity Index determined for Caulerpa taxifolia showed a wide range of values (3.11–4.88), with a maximum in August and a minimum in October. While the number of taxa on Caulerpa taxifolia fronds increased from June (41) to August (88), it declined in autumn due to the high relative abundance of Cocconeis caulerpacola, which is a diatom typical for Caulerpa. On the other hand, the largest number of taxa on Padina sp. was observed in September (82). The detailed composition of epiphytic diatoms and seasonal dynamics in the area affected by the invasive macroalga Caulerpa taxifolia have been determined for the first time.

Ana Car
Institute for Marine and Coastal Research, Kneza Damjana Jude 12, pp 83, 20000 Dubrovnik, Croatia
Andrzej Witkowski
Palaeoceanology Unit, Natural Sciences Education and Research Centre of University of Szczecin, ul. A. Mickiewicza 18,16, 70-383 Szczecin, Poland
Sławomir Dobosz
Palaeoceanology Unit, Natural Sciences Education and Research Centre of University of Szczecin, ul. A. Mickiewicza 18,16, 70-383 Szczecin, Poland
Nenad Jasprica
Institute for Marine and Coastal Research, Kneza Damjana Jude 12, pp 83, 20000 Dubrovnik, Croatia
Stijepo Ljubimir
Matije Gupca 5, 20000 Dubrovnik, Croatia
Izabela Zgłobicka
Faculty of Materials Science and Engineering, Warsaw University of Technology, ul. Wołoska 141, 02-507 Warsaw, Poland; Faculty of Mechanical Engineering, Bialystok University of Technology, ul. Wiejska 45C, 15-351 Białystok, Poland


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