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Two oligotrophic systems of different origin (one originating from the Atlantic flow, the other a typical Mediterranean one) and a frontal system were occurring in the Algerian Basin during June 1990. The copepod communities and their diversity in the epipelagic layer were closely related to these different environments. Furthermore, in this area a great number of Atlantic species of copepods have been caught, as well as 9 deep water species. In the coastal system where the modified Atlantic Water is flowing, the number of copepod species is varying from station to station, depending on mixing and turbulence processes as cyclonic and anticyclonic eddies inducing coastal upwelling (station 5) and leading to a low species diversity index as well as a low evenness, indicating a disturbed environment. In the frontal system, the main characteristic is a high density of copepods dominated by a single species, Paracalanus parvus, the low species diversity index and a very low evenness indicating an instable environment, as testified by an enhanced production and by physical-chemical gradients. In the open Mediterranean sea area where mixing and turbulence are absent, the copepod community revealed a well-diversified species composition with a high species diversity index; the relationship with the highest evenness values suggests that this community is in the stage of maturity, with dominant species of similar abundance, and that the environment is stable.

Deux systemes oligotrophes d'origine differente (l'un de l'Atlantique, l'autre typiquement mediterraneen) et un systeme frontal etaient presents dans le Bassin algerien en juin 1990. Les communautes de copepodes et la diversite dans la couche epipelagique sont en relation etroite avec ces differents environnements. De plus, dans cette zone, un grand nombre d'especes de copepodes de l'Atlantique ont ete prises, ainsi que 9 especes d'eau profonde. Dans le systeme cotier ou circule l'Eau Atlantique modifiee, la densite des especes de copepodes varie d'une station a l'autre, en fonction des processus de melange et de turbulences, tels que les tourbillons cycloniques et anticycloniques induisant des upwellings cotiers et conduisant a un faible indice de diversite specifique, comme a une faible regularite [''evenness''] denotant un environnement perturbe. Dans le systeme frontal, la principale caracteristique est une haute densite des especes de copepodes, avec une seule espece dominante, Paracalanus parvus, le faible indice de diversite specifique et une tres faible regularite denotant un environnement instable, ceci mis en evidence par une production elevee et par les gradients physico-chimiques. Dans la zone de Mediterranee aux eaux ouvertes, ou melange et turbulences sont absents, la communaute de copepodes a montre une composition specifique bien diversifiee, avec un indice de diversite specifique eleve; la relation avec les plus hautes valeurs de regularite suggere que la communaute est au stade de maturite, avec les especes dominantes d'abondance similaire, et que l'environnement est stable.


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