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Contraintes du milieu sur les populations de Donax trunculus L. et Donax venustus Poli du littoral atlantique marocain ArchiMer
Guillou, Jacques; Bayed, A.
Populations of Donax trunculus and Donax venustus were sampled along the Moroccan Atlantic coast from Tanger to Tarfaya (Cape Juby) in 1986 and 1987. All the investigated beaches are surf-exposed and belong to the dissipative system. The geographical distribution of the dominant species D. trunculus appears to be obviously influenced by swell-related hydrodynamics. This phenomenon is controlled by the slope on the nearshore side of a critical 30 m depth, and can be expressed in terms of the distance from the coast of the corresponding isobath. A model of adult density distribution is based on this parameter. When the distance in question is less than 2 km, Donax are absent. The maximal densities observed are on the whole weak and suggest the limiting...
Tipo: Text Palavras-chave: Donax trunculus; Donax venustus; Moroccan Atlantic coast; Geographical distribution; Hydrodynamism; DONAX-TRUNCULUS; DONAX-VENUSTUS; MOROCCAN ATLANTIC COAST; GEOGRAPHICAL DISTRIBUTION; HYDRODYNAMISM.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00323/43396/43067.pdf
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