Epiphytic diatom communities on intertidal seaweeds from Iceland |
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| Authors: | Cecilia Totti Michel Poulin Tiziana Romagnoli Cesira Perrone Chiara Pennesi Mario De Stefano |
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| Institution: | (1) Department of Marine Sciences, Polytechnical University of the Marche, via Brecce Bianche, 60131 Ancona, Italy;(2) Research Division, Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, ON, KIP 6P4, Canada;(3) Department of Plant Biology and Pathology, University of Bari, via Orabona 4, 70125 Bari, Italy;(4) Department of Environmental Sciences, 2nd University of Naples, via Vivaldi 43, 81100 Caserta, Italy |
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| Abstract: | Epiphytic diatom communities on macroalgae from Iceland coastal waters were investigated during July 2005. Ten species of
seaweeds have been collected belonging to brown, red and green algae. The analysis of epiphytic diatom community was carried
out under scanning electron microscopy. The epiphytic diatom abundances varied from 7 ± 5 to 7524 ± 3491 cells mm−2. Erect growth forms were the most abundant, representing on average 50% of the total diatoms (Achnanthes cf. brevipes var. parvula, Tabularia investiens, T. fasciculata, Hyalosira cf. delicatula, Gomphoseptatum aestuarii, Pseudogomphonema plinskii), followed by adnate (29%) (Cocconeis stauroneiformis, C. scutellum) and motile forms (21%) (Nitzschia cf. amphibia and Navicula perminuta). Highly branched seaweeds with articulated thallus surface, offering a number of microenvironments to be occupied by the
epiphytes, showed a high level of colonization, mainly due to erect and motile diatoms. Flat thalli with smooth surface allowed
for the growth of mainly erect diatoms. |
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