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Distribution of the Tripos species (dinoflagellata) from Annaba Bay (Southwestern Mediterranean Sea)

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Research Paper 01/02/2018
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Distribution of the Tripos species (dinoflagellata) from Annaba Bay (Southwestern Mediterranean Sea)

Mebarek Ayada, Aicha Beya Amira, Abdelkhalek Retima
J. Bio. Env. Sci.12( 2), 40-50, February 2018.
Certificate: JBES 2018 [Generate Certificate]
Key: Annaba BayMediterranean SeaNutrientsPhytoplanktonTriposTripos massiliens

Abstract

The genus Tripos has been described as a key component in the World Ocean and in Mediterranean phytoplankton. Despite its high species diversity, the Tripos genus has also been considered to be the most important taxa, contributing significantly to the dinofalgellates and phytoplankton abundance. Though information on the phytoplankton of Algerian marine waters is still lacking, and the few available data are very limited to some local and sparse works. Here we study the seasonal distribution and composition of Tripos species regarding the environmental framework and assess changes in the environmental conditions that may affect the Tripos populations. The phytoplankton was monthly sampled during February 2010-Jabuary 2011 at two contrasted sites of Annaba Bay, Algeria. The phytoplankton biomass (measured as chlorophyll a) and the hydrological parameters (temperature, salinity and macronutrients) were jointly measured. The innermost area (site 1) which is directly impacted by riverine, industrial and household wastes input had high levels of nutrients and strong phytoplankton biomasses. The outer area (site 2), located at the entrance of the bay which is directly influenced by the open sea, namely the Modified Atlantic Water (MAW) current, showed very low concentrations for both nutrients and phytoplankton standing stock. In the present work we report for the first time 47 Tripos species; almost all of them can be considered as tropical and subtropical species. These types of species seem to be adapted to the warm waters, showing long horns that help maintaining the body buoyancy. The majority of the identified Tripos species showed affinities to the open waters, at site 2, where numerous of them can develop minor spring bloom. Only few species were associated to the eutrophicated area of the innermost bay (site 1).

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