Variabilite mensuelle du zooplancton et de l'ichtyoplancton dans le golfe de Tunis
Monthly variability of zooplankton and ichthyoplankton abundance and composition were studied in 6 stations in the Gulf of Tunis between February 2003 and January 2004. Plankton trawls were horizontal, in surface and at night. Study area seems to be influenced by climatic conditions and the outflow of Majreda River that affect the surface temperature and salinity. Copepods, with many abundance peaks in the year, formed the most abundant group (84%) followed by cladocerans (8%) and chaetognaths (3%). The appendicularians, cladocerans and medusae had swarms in the summer, the creseis and the chaetognths in the autun and the zoae larvae in the spring. The highest fish spawning periods was in summer then the highest larva abundance was in winter and summer.Original Abstract: De Fevrier 2003 a Janvier 2004, douze campagnes mensuelles ont ete effectuees dans 6 stations dans le golfe de Tunis pour l'etude du zooplancton et de l'ichtyoplancton. Les traits ont ete horizontaux et pendant la nuit. La zone d'etude semble etre tres influencee par le climat de la region et des apports de l'Oued Majreda qui affectent la temperature et la salinite des eaux de surface. Les copepodes, avec plusieurs pics pendant l'annee, ont ete le groupe le plus dominant du zooplancton soit 84% puis les cladoceres (8%) et les chaetognathes (3%). Les appendiculaires, les cladoceres et les meduses ont eu des essaims estivaux, les creseis et les chaetognathes automnaux alors que pour les larves zoes printanieres. L'intensite de ponte des poissons a ete la plus forte pendant l'ete alors que les larves ont ete les plus abondantes pendant l'hiver et l'ete.
| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | French |
| Published: |
INSTM
2004
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| Subjects: | Zooplankton, Fish larvae, Community composition, Ichthyoplankton, Temporal variations, |
| Online Access: | http://hdl.handle.net/1834/4242 |
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| Summary: | Monthly variability of zooplankton and ichthyoplankton abundance and composition were studied in 6 stations in the Gulf of Tunis between February 2003 and January 2004. Plankton trawls were horizontal, in surface and at night. Study area seems to be influenced by climatic conditions and the outflow of Majreda River that affect the surface temperature and salinity. Copepods, with many abundance peaks in the year, formed the most abundant group (84%) followed by cladocerans (8%) and chaetognaths (3%). The appendicularians, cladocerans and medusae had swarms in the summer, the creseis and the chaetognths in the autun and the zoae larvae in the spring. The highest fish spawning periods was in summer then the highest larva abundance was in winter and summer.Original Abstract: De Fevrier 2003 a Janvier 2004, douze campagnes mensuelles ont ete effectuees dans 6 stations dans le golfe de Tunis pour l'etude du zooplancton et de l'ichtyoplancton. Les traits ont ete horizontaux et pendant la nuit. La zone d'etude semble etre tres influencee par le climat de la region et des apports de l'Oued Majreda qui affectent la temperature et la salinite des eaux de surface. Les copepodes, avec plusieurs pics pendant l'annee, ont ete le groupe le plus dominant du zooplancton soit 84% puis les cladoceres (8%) et les chaetognathes (3%). Les appendiculaires, les cladoceres et les meduses ont eu des essaims estivaux, les creseis et les chaetognathes automnaux alors que pour les larves zoes printanieres. L'intensite de ponte des poissons a ete la plus forte pendant l'ete alors que les larves ont ete les plus abondantes pendant l'hiver et l'ete. |
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