Importance of hydrological parameters in the distribution of planktonic eggs and larvae in an upwelling zone (Imessouane Bay, Moroccan Atlantic Coast)

Document Type: Research Paper


Laboratory of Aquatic Systems: Marine and Continental Ecosystems, Faculty of Sciences – Ibn Zohr University, BP. 8160, Agadir, Morocco



The present study aimed to evaluate the spring biodiversity of planktonic eggs and larvae in Imessouane Bay and to assess their variability according to the hydrological parameters of the environment. Twenty seven biological and hydrological samples were taken at three stations during a three-month period (March, April and May 2018). The qualitative study revealed the presence of 26 taxa, divided into six major groups, of those the Arthropod larvae were the most dominant (43.16%). The maximum abundances of planktonic eggs and larvae were recorded during May, as the richest month in terms of diversity (25 taxa). The principal component analysis of the hydrological parameters made it possible to define a temporal organization dominated by 3 groups. The canonical correspondence analysis exhibited that certain environmental parameters are essential factors for the functioning and the spatiotemporal variability of the planktonic communities.


Ait-Talborjt, E, Hafidi, N, Hermas, J, Ez-Zaher, L & El Ouizgani, H 2016a, Plankton variability in relation to some environmental factors in the Imessouane bay, Morocco. International Journal of Advanced Research, 4: 914-923.

Ait-Talborjt, E, Hafidi, N & El Ouizgani, H 2016b, Study of plankton communities in the Imessouane Bay, International Journal of Sciences: Basic et Applied Research, 30: 204-214.

Aminot, A & Kerouel, R 2004, Marine Ecosystem Hydrology, Parameters and Analyses, Ed. Ifremer, 366 p.

Benbakhta, B 1994, Structure and dynamics of zooplankton in the Moulay Bousselham Laguna (Morocco) PhD Dissertation, Faculty of Sciences of Rabat - Mohammed V University, Morocco, 125 p.

Benchalel, W, Bouziane, A, Bouslama, Z, Ramdani, M, ELmsellem, H, Roger, F, Ramdani, M 2018, Odonata of Wadi Bouarroug (northeastern Algeria), and environmental determinants of their distribution. Mor J Chem, 6: 78-91

Berraho, A 2007, Spatial relations between environment and ichthyoplankton of small pelagic species of the Moroccan Atlantic coast (Central and southern zones). PhD Dissertation, Faculty of Sciences of Rabat - Mohammed V University, Morocco, 261 p.

Berraho, A, Chbani, M & Mesfioui, A 1996, Study of the ichthyoplankton of the Moroccan Atlantic coasts (Winter - Summer 1994), Studies and documents, 98, p. 52.

Chaouay, A, Okhrib, R, Hilali, M, Bazzi, L, Chahid, A & Khiri, F 2016, Contribution to the study of physico-chemical analysis et metal contamination of coastal Agadir seawater (South Morocco). Journal of Materials and Environmental Science, 7: 2748-2759.

El Blidi, S & Fekhaoui, M 2003, Hydrology and tidal dynamics of the Sebou estuary (Gharb, Morocco). Bulletin of the Scientific Institute Rabat, Morocco Life Sciences Section, 25: 57-65.

Ezzaouaq, M 1991, Hydrodynamic, physico-chemical and bacteriological characterization of the surface waters of the Bou-Regreg estuary (Morocco), subject to the discharges of the cities of Rabat-Salé. PhD Dissertation, Faculty of Sciences of Rabat - Mohammed V University, Morocco, 140 p.

Himmi, N, Hasnaoui, M, Fekhaoui, M, Foutlane, A, Bourchich, H, El Maroufy, M & Benazzou, T 2005, Variability of physical, chemical and biological variables of a storage reservoir (combined stabilization pond, Ben Slimane-Morocco). Revue des sciences de l'eau, 18: 91-107.

Lakkis, S & Zeidane, R 1987, Modifications of planctonic ecosystem by pollution along the Lebanese coast, FAO Fisheries Report, pp. 23-159.

Lakkis, S & Zeidane, R 1988, Larvae of Crusrtaceans Decapods of Lebanese coastal waters. Composition, diversity and annual cycle. Lebanese Science Bulletin, 4: 5-33.

Lakkis, S & Zeidane, R 1989, Ichtyoplancton of Lebanese coastal waters: structure et ecological differentiation. Lebanese Science Bulletin, 5: 17-42.

Laubier, L 1966, On a few polychaete annelids from the Beirut area. Miscellaneous Papers in the Natural Sciences, American University of Beirut, 5: 9-23.

Lebreton, JD, Chessel, D, Prodon, R & Yoccoz, N 1988, The analysis of species-environment relations through canonical correspondence analysis. Acta Oecologica, 9: 53-67.

Makaoui, A, Orbi, A, Hilmi, K, Zizah, S, Larissi, J & Talbi, M 2005, The upwelling of the Atlantic coast of Morocco between 1994 and 1998. Oceanography (Marine Geology). Reports Geoscience, 337: 1518-1524

Pronier, O 2000, Analysis of ichtyoplankton in French water and perspective of fish management. PhD Dissertation, Institute of National Polytechnique of Tolouse, France, 200 p.

Salehzadeh, A, Nazarhaghighi, F,. Naeemi, A S, 2019, Morphological characterization of Chironomidae (Diptera) larvae in Anzali Wetland, Southwest Caspian Sea: First record of Chironomus plumosus, Caspian Journal of Environmental Sciences, 17: 237-248

Somoue, L, Berraho, A, Ettahiri, O, Elkhiati, N, Ramdani, M, Larissi, J & Makaoui, A 2013, Plankton (phytoplankton, zooplankton and ichthyoplankton) of the South Atlantic coast of Morocco (Cap Boujdor-Cap Blanc). Studies of the Scientific Institute, Rabat, Zoology Series, 49: 7-18.

Ter Braak, CJF 1986, Canonical correspondance analysis : New eingenvector techniques for multivariate direct gradient analysis. Ecology, 67: 1167-1179.

Thiriot, A 1978, Zooplankton communities in the West African upwelling area. In: R. Boje, M. Tomzak (Eds.), Upwelling Ecosystems, Springer, Berlin, pp. 32-61.