Food web structure variability in the surface layer, at a fixed station influenced by the North Western Mediterranean Current |
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Authors: | Urania Christaki France Van Wambeke Epaminondas D Christou Pascal Conan Raymond Gaudy |
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Institution: | (1) Centre d'Océanologie de Marseille, Station marine d'Endoume, Rue de la Batterie des Lions, CNRS URA 041, 13 007 Marseille, France;(2) Microbiologie Marine, C.N.R.S., U.P.R. 223, Campus de Luminy, Case 907, 13 288 Marseille Cedex 9, France;(3) National Centre for Marine Research, GR-16 004 Aghios Kosmas Hellinikon, Greece;(4) Centre d'Océanologie de Marseille, Campus de Luminy, CNRS URA 041, 13 288 Marseille Cedex 9, France |
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Abstract: | The structure of the planktonic community and the influence of mesozooplankton migration on the microbial food web were investigated during six diel studies from June 92 to June 93 in the surface waters of a station in the North-Western Mediterranean Sea. Each diel study consisted of sampling at 5 and 40 m every 3 h over 24 h. Most of the times diel cycles did not show any convincing diel patterns in any of the variables studied. Clear zooplankton migration was evident in only two diel studies.The ratio of heterotrophic/autotrophic biomasses varied from 0.68 to 3.0, with a strong dominance of the heterotrophic biomass under oligotrophic conditions. Differences in food web structure were probably related to the influences of coastal water and the North-Western Mediterranean Current. Thus we found that the planktonic food web variability relatable to hydrodynamic variability, to be greater than diel variability. However, very large differences in food web structure among dates were evident. For example proportion of Chl a found in the <10 µm fraction varied from 18 to 96%. |
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Keywords: | microbial food web diel cycles mesozooplankton NW Mediterranean Sea |
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