Scientia Marina, Vol 81, No 4 (2017)

Variability patterns of epibenthic microalgae in eastern Tunisian coasts


https://doi.org/10.3989/scimar.04651.17A

Malika Moncer
Faculté des Sciences de Sfax - Institut National des Sciences et des Technologie de la Mer de Sfax, Tunisia
orcid http://orcid.org/0000-0002-3344-6039

Asma Hamza
Institut National des Sciences et des Technologie de la Mer de Sfax, Tunisia
orcid http://orcid.org/0000-0001-8228-012X

Wafa Feki-Sahnoun
Institut National des Sciences et des Technologie de la Mer de Sfax, Tunisia
orcid http://orcid.org/0000-0003-1688-2071

Lotfi Mabrouk
Faculté des Sciences de Gafsa, Campus Universitaire Sidi Ahmed Zarroug, Tunisia
orcid http://orcid.org/0000-0001-8356-6058

Malika Bel Hassen
Institut National des Sciences et des Technologie de la Mer de Salammbô, Tunisia
orcid http://orcid.org/0000-0001-7412-9948

Abstract


Epiphytic microalgae were monitored on various substrates of seagrass and macroalgae and in the water column for one year (from March 2013 to March 2014) in Oued Lafrann along the eastern coast of Chebba (Tunisia) with a focus on the distribution patterns of the epibenthic toxic dinoflagellates Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis. Microalgae assemblages were dominated by diatoms and dinoflagellates both in the water column and on vegetation. High concentrations of epiphytic toxic and potentially toxic dinoflagellates were preferentially hosted by Posidonia leaves, mainly in the apical and middle regions of the leaves, and P. lima was the dominant species. A significant positive correlation was found between P. lima concentrations on Posidonia and in the water column, suggesting that macrophytes should be sampled in the framework of harmful algal species monitoring. Ostreopsis cf. ovata, exhibited low concentrations and was mainly present on the inner surface of the Posidonia leaf, whereas P. lima was mainly present on the outer surface of the leaf, suggesting a likely space competition.

Keywords


Prorocentrum lima; Ostreopsis cf. ovata; Coolia monotis; Prorocentrum micans; magnoliophytes; macroalgae

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References


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