Abstract
The suggestion that the annual cycle of plant production in tropical oceanic regions may be negligible or non-existent is examined, using data from a year-long cruise series in the eastern tropical Pacific. Results of analysis of variance show a highly significant seasonal effect. Average values of the seasonal cycle were found to range from 127 to 318 mg C/m2/day, a systematic two-fold variation over the year. Annual production was 75 g C/m2/year. Significant differences also were found between longitudes, and a slightly significant interaction occurred between season and longitude. Probable sources of the seasonal cycle include time variation of thermocline topography and variation of nutrient supply from local source areas such as the Costa Rica Dome, Gulf of Tehuantepec, Peru Current extension, and Equatorial Undercurrent domain.
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Literature cited
Beers, J. R., D. M. Steven and J. B. Lewis: Primary productivity in the Caribbean Sea off Jamaica and the tropical north Atlantic off Barbados. Bull. mar. Sci. 18, 86–104 (1968).
Blackburn, M.: An oceanographic study of the Gulf of Tehuantepec. Spec. Scient. Rep. U.S. Fish. Wildl. Serv. (Fisheries) No. 404, 1–28 (1962).
Broenkow, W. W.: The distribution of nutrients in the Costa Rica Dome in the eastern tropical Pacific. Limnol. Oceanogr. 10, 40–52 (1965).
Cushing, D. H.: The seasonal variation in oceanic production as a problem in population dynamics. J. Cons. perm. int. Explor. Mer 24, 455–464 (1959).
Heinrich, A. K.: The life histories of plankton animals and seasonal cycles of plankton communities in the oceans. J. Cons. perm. int. Explor. Mer 27, 15–24 (1962).
Jitts, J. R.: Seasonal variations in the Indian Ocean along 110° E. IV. Primary production. Aust. J. mar. Freshwat. Res. 20, 65–75 (1969).
Kabanova, Yu. G.: Primary production of the northern part of the Indian Ocean. Oceanology 8, 214–225 (1968).
Koblentz-Mishke, O. J.: Primary production. [Russ.] In: The Pacific Ocean; biology of the Pacific Ocean, I. Plankton, pp 86–97. Ed. by V. G. Bogorov. Moscow, Moskva Izdat Nauk 1967.
Menzel, D. W. and J. H. Ryther: The annual cycle of primary production in the Sargasso Sea off Bermuda. Deep Sea Res. 6, 351–367 (1960).
Sournia, A.: Cycle annuel du phytoplancton et de la production primaire dans les mers tropicales. Mar. Biol. 3, 287–303 (1969).
Steemann Nielsen, E.: The use of radio-active carbon for measuring organic production in the sea. J. Cons. perm. int. Explor. Mer 18, 117–140 (1952).
Winsor, C. P. and G. L. Clarke: A statistical study of variation in the catch of plankton nets. J. mar. Res. 3, 1–34 (1940).
Wyrtki, K.: Upwelling in the Costa Rica Dome. Fishery Bull. Fish Wildl. Serv. U.S. 63, 355–372 (1964).
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Communicated by G. L. Voss, Miami
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Owen, R.W., Zeitzschel, B. Phytoplankton production: seasonal change in the oceanic eastern tropical Pacific. Marine Biology 7, 32–36 (1970). https://doi.org/10.1007/BF00346805
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DOI: https://doi.org/10.1007/BF00346805