Potentially harmful microalgae in coastal waters of the Algiers area (Southern Mediterranean Sea)

Publication Type:Journal Article
Year of Publication:2008
Authors:H. Illoul, Maso, M., Fortuno, J. M., Cros, L., Morales-Blake, A., Seridji, R.
Journal:Cryptogamie Algologie
Volume:29
Pagination:261-278
Date Published:Aug
ISBN Number:0181-1568
Keywords:algerian current, algiers harbour, Biomass, blooms, estuary, forming dinoflagellate dinophyceae, gymnodinium-chlorophorum, harmful algal blooms (hab), holococcolithophora sphaeroidea, phytoplankton, Pollution, recurrent, region, southern mediterranean
Abstract:

A series of seasonal, monthly and short-term samplings was conducted in open and confined waters of the Algiers area in 2001-2002 and summer 2003 in order to detect potentially harmful microalgae species (HAB). A total of 14 potentially toxic and 18 bloomforming species were recorded. of which some were found for the first time in Algerian coastal waters: the potential toxin producers Alexandrium minutum, Dinoplysis succulus (dinoflagellates) and Pseudo-nitzschia calliantha (diatom), as well as the bloom-forming species Lepidodinium chlorophorum (dinoflagellate), Cyclotella meneghiniana (diatom) and Holococcolithophora sphaeroidea (holococcolithophorid). The latter produced a very important bloom with considerable water discoulouration. The occurrence and duration of this event in the Algiers Harbour underline the importance of this enclosed structure as a growth area for HAB species. The transport of a H. sphaeroidea bloom toward off-shore waters by an anticyclonic eddy demonstrates the effect of Algerian current mesoscale instabilities oil the spatial distribution of phytoplankton communities.

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