Abstract
The vertical structure of the ecosystem in the euphotic zone of the western Equatorial Pacific has been studied. The studies were based on a continuous sounding of the bioluminescence field, with simultaneous, vertically aimed sampling made with the aid of a 5l water bottle and plankton nets. The bioluminescence field has a two-maxima structure with a more pronounced and permanent lower maximum found in the oligotrophic regions as deep as 60 to 100 m. In the narrow (10 m) layer of maximum bioluminescence, the concentration of zooplankton, as well as the concentration, activity and production of bacteria and phytoplankton, are several times higher than those in immediately adjacent waters at greater or lesser depth. At the same time, the concentration of nutrient salts in that layer diminishes sharply and approaches zero in the overlying water. Analysis of the data obtained shows that the production processes above the lower maximum layer are dependent not only on the turbulent influx of nutrient salts from the underlying layers, but also on the horizontal supply from the zone of upwelling. A pelagic community, in its different time aspects from the moment of water ascending until its sinking in the convergence zone, is suggested as a common system for modelling.
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Literature cited
Barnard, F. Plankton et benthos observés durant trois plongées en bathyscaphe au large de Toulon. Annls Inst. océanogr., Monaco (N. S.) 35, 287–318 (1958).
Cushing, D. H. Models of the production cycle in the sea. In: Morning review lectures of the Second International Oceanographic Congress, pp 103–115. UNESCO 1969.
Gitelzon, I. I., L. A. Levin, A. P. Shevyrnogov, R. N. Utyushev and A. S. Artemkin: Bathyphotometric sounding of the epipelagic zone and the possibilities of its application to the studies of the vertical structure of a biocoenosis. Trudy Inst. Okeanol. (In press). (1970).
Jorgensen, C. B. The food of filter feeding organisms. Rapp. P.-v. Cons. perm. int. Explor. Mer 152, 99–107 (1962).
Margalef, R. D. The food web in the pelagic environment. Helgoländer wiss. Meeresunters. 15, 548–559 (1967).
Patten, B. C. Mathematical models of plankton production. Int. Revue ges. Hydrobiol. 53 (3), 357–408 (1968).
Petipa, T. S., E. V. Pavlova and Yu. I. Sorokin: Studies of feeding of the mass plankton forms from the tropical Pacific with the aid of C14. Trud y Inst. Okeanol. (In press). (1970).
Romanenko, V. I.: Heterotrophic assimilation of carbonic acid by water microflora. Microbiology 33 (4), 679–683 (1964).
Semina, H. J.: Phytoplankton. In: The Pacific Ocean. Biology of the Pacific Ocean. Book 1. Plankton pp 27–85., Moscow: Nauka 1967.
Sorokin, Yu. I.: On the effect of water stratification on the primary production of photosynthesis in the sea. Zh. obshch. Biol. 20 (6), 455–463 (1959).
—: Vertical distribution of phytoplankton and the primary organic production in the sea. J. Cons. perm. int. Explor. Mer 26 (1), 49–56 (1960).
Timonin, A. G.: Structure of the pelagic communities. The quantitative relationship between different trophic groups of plankton in the frontal zones of the tropical ocean. Okeanologia 9 (5), 846–856 (1969).
Vinogradov, M. E.: Vertical distribution of the oceanic zooplankton, pp 7–320. Moscow: Nauka 1968.
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Communicated by M. E. Vinogradov, Moscow
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Vinogradov, M.E., Gitelzon, I.I. & Sorokin, Y.I. The vertical structure of a pelagic community in the tropical ocean. Marine Biology 6, 187–194 (1970). https://doi.org/10.1007/BF00347226
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DOI: https://doi.org/10.1007/BF00347226