title: [Phytoplankton distribution in the upwelling areas of the Moroccan Atlantic coast localized between 32°30'N and 24°N].
abstract: Marine phytoplankton was studied in January and July 2002 along of four transects: 32°30'N, 29°N, 24°30'N and 24°N. A total of 142 taxa were recorded in this area. The maximal specific richness, both in summer and in winter, was registered around Dakhla (24°N). The global spatiotemporal variability of species richness and specific diversity showed that the most structured and species-rich populations are situated in the coastal areas. The vertical variation of the two parameters showed homogeneity between depth levels. The maximal phytoplanktonic densities are recorded in the southern transects due to the permanent upwelling activity in the southern Atlantic coast. The bathymetric distribution of densities was more heterogeneous during summer, characterized by a high intensity of upwelling. The species Thalassionema nitzschioides, Asterionellopsis glacialis, Melosira, Chaetoceros and Leptocylindrus minimus are indicators of upwelling.
authors.affiliation: Faculté des sciences Aïn Chock, Km 8, route d'El Jadida, BP 5366, 20100 Casablanca, Maroc. hasnagh@yahoo.fr
authors.forename: Hasna
authors.initials: H
authors.lastname: Elghrib
authors.forename: Laila
authors.initials: L
authors.lastname: Somoue
authors.forename: Najat
authors.initials: N
authors.lastname: Elkhiati
authors.forename: Amina
authors.initials: A
authors.lastname: Berraho
authors.forename: Ahmed
authors.initials: A
authors.lastname: Makaoui
authors.forename: Noureddine
authors.initials: N
authors.lastname: Bourhim
authors.forename: Siham
authors.initials: S
authors.lastname: Salah
authors.forename: Omar
authors.initials: O
authors.lastname: Ettahiri
mesh_terms: D000465:Algorithms; D000704:Analysis of Variance; D001267:Atlantic Ocean; D002965:Classification; D004784:Environmental Monitoring; D014644:Genetic Variation; D005843:Geography; D009018:Morocco; D010839:Phytoplankton / Q000145:classification / Q000502:physiology*; D012621:Seasons; D012623:Seawater