Data/hora: 11/06/2024 00:48:00

Provedor de dados: 	5	
País: 	France	
Título: 	Contraintes du milieu sur les populations de Donax trunculus L. et Donax venustus Poli du littoral atlantique marocain	
Autores: 	Guillou, Jacques; Bayed, A.	
Data: 	1991	
Ano: 	1991	
Palavras-chave: 	Donax trunculus; Donax venustus; Moroccan Atlantic coast; Geographical distribution; Hydrodynamism; DONAX-TRUNCULUS; DONAX-VENUSTUS; MOROCCAN ATLANTIC COAST; GEOGRAPHICAL DISTRIBUTION; HYDRODYNAMISM.	
Resumo: 	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 function of this hydrodynamic instability. Analysis of the geographical distribution of D. venustus also suggests a climatic influence, the occurrence of this species on the shore being correlated with the intensity of the trade winds. The explanation is to be found in the relative stenothermy of a species with subtidal affinity, the temperature range being reduced in these upwelling areas.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00323/43396/43067.pdf

http://archimer.ifremer.fr/doc/00323/43396/	
Editor: 	Gauthier-villars	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-villars), 1991 , Vol. 14 , N. 3 , P. 291-298	
Fonte: 	Gauthier-Villars

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