Algal diversity study in the western Algerian coast


S. Mehiaoui*, F. Nemchi, Z. Bouzaza, T. Farah and B. Bachir-Bouiadjra

In order to identify species of seaweed on the algerian west coast, an exhaustive checklist was carried out. A total of 162 species was identified spread over three phyla: 77 species of Rhodophyceae, 48 species Pheophyceae and 37 species Chlorophyceae. Among the algae listed, six are considered invasive in the Mediterranean. The overall ratio of Rhodophyceae to Pheophyceae (R/P) is estimated at 2.19 for the entire study area.This is close to the national average estimated at 3 as well as other areas of the Mediterranean. The calculation of the Shannon-Weaver (H') and Equitability (E') diversity index identifies the ecological status of the sites which varies more or less moderately (2.53 ≤ H' ≤ 3.09; 1.38 ≤ E' ≤ 1.75) for the Ben Abdelmalek ramdan, Petit port, Bahra and El-Geulta sites, to mediocre (1.03 ≤ H' ≤1.24; 0.55 ≤ E' ≤ 0.84) for Saint-Michel, Mers El-Hadjadj, Stidia, Ouréah, Sablette, Salamander and El-Marsa. A Correspondence Analysis (CA) supported previous analysesin order to find the relation between the geographical position of the chosen sites and the algae inventoried. This analysis revealed that a floristic composition representative of healthy waters distinguishes the two sites Abdelmalek Ramdan and Bahara. This study could be a valuable tool in the field of biomonitoring and conservation biology.

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