<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>This study focuses on the taxonomy of epiphytic diatoms in the area of invasive macroalgae from the genus <italic>Caulerpa. Caulerpa</italic> 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 <italic>Caulerpa taxifolia</italic> (“killer seaweed”) and, for comparison, on autochthonous macroalgae <italic>Padina</italic> sp. and <italic>Halimeda tuna</italic> 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 <italic>Caulerpa taxifolia</italic> 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 <italic>Caulerpa taxifolia</italic> fronds increased from June (41) to August (88), it declined in autumn due to the high relative abundance of <italic>Cocconeis caulerpacola</italic>, which is a diatom typical for <italic>Caulerpa</italic>. On the other hand, the largest number of taxa on <italic>Padina</italic> sp. was observed in September (82). The detailed composition of epiphytic diatoms and seasonal dynamics in the area affected by the invasive macroalga <italic>Caulerpa taxifolia</italic> have been determined for the first time.</p></abstract>

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.

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

Oceanological and Hydrobiological Studies

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Epiphytic diatom assemblages on invasive  and autochthonous  and  sp. seaweeds in the Adriatic Sea – summer/autumn aspect

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...

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

Article Category: Original research paper

Publié en ligne: 22 sept. 2019

Pages: 209 - 226

Reçu: 14 nov. 2018

Accepté: 28 janv. 2019

DOI: https://doi.org/10.2478/ohs-2019-0019

© 2019 Faculty of Oceanography and Geography, University of Gdańsk, Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.