5. Towards the end of the Tehuantepecer 

 season (May) the ridge and hollow flatten 

 out, upward transfer of water properties 

 diminishes, and productivity and standing crops 

 of biota all decline. 



LITERATURE CITED 



AUSTIN, THOMAS S. 



1960. Oceanography of the east central 

 equatorial Pacific as observed during 

 Expedition Eastropic. U.S. Fish and 

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 vol. 60, p. 257-282. 



BLACKBURN, MAURICE, and ASSOCIATES. 

 1962. Tuna oceanography in the eastern 

 tropical Pacific. U.S. Fish and Wild- 

 life Service, Special Scientific Report — 

 Fisheries No. 400, 48 p. 



BRANDHORST, WILHELM. 



1958. Thermocline topography, zooplankton 

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 Conseil Permanent International Ex- 

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CROM^yELL, TOWNSEND. 



1958. Thermocline topography, horizontal 

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1960. Pycnoclines created by mixing in an 

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CROMWELL, TOWNSEND, and EDWARD B. 

 BENNETT. 



1959. Surface drift charts for the eastern 

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CROMWELL, TOWNSEND, and JOSEPH L. 

 REID. 

 1956. A study of oceanic fronts. Tellus, 

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FRANCIS, J. R. D., and HENRY STOMMEL. 

 1953. How much does a gale mix the 

 surface layers of the ocean? Royal 

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 nal, vol. 79, p. 534-536. 



HOLMES, ROBERT W. 



1958. Surface chlorophyll 'a', surface pri- 

 mary production, and zooplankton vol- 

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HOLMES, ROBERT W.,andMAURICE BLACK- 

 BURN. 



1960. Physical, chemical, and biological 

 observations in the eastern tropical 

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MARSHALL, N. B. 



1954. Aspects of deep sea biology. Philo- 

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METEOROLOGICAL OFFICE, LONDON (AIR 



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eastern Pacific Ocean. MO 518, Her 



Majesty's Stationery Office, London, 



122 p. 



RODEN, G. I. 



1961. On the wind-driven circulation in the 

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RODEWALD, M. 



1959. Beitrage zur Klimaschwankung im 

 Meere. 11. Beitrag, Die ostpazifische 

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UNITED STATES NAVY. 



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1951, Sailing directions for the west coasts 

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