ABSTRACT 



This SCOPE report describes the methods employed, lists in 

 tabular form the results obtained, and includes a series of papers which 

 discuss the results of a preliminary analysis of certain of the biological 

 observations which were obtained on a cruise to the Eastern Tropical 

 Pacific accomplished by the University of California, Scripps Institution 

 of Oceanography, under Contract No. 1^-19-008-2^5 with the Department of 

 Interior, U. S. Fish and Wildlife Service. Scientific personnel, equipment, 

 and financial support for the data analysis have been largely provided by the 

 University of California, Scripps Institution of Oceanography and the Inter- 

 American Tropical Tuna Commission. 



Information was obtained on the vertical and horizontal 

 variations in temperature, salinity, dissolved oxygen, inorganic phosphorus, 

 nitrite, alkalinity, pH, chlorophyll "a", primary production, bacterial 

 abundance, and zooplankton standing crop. A nearly continuous record of 

 incident solar radiation was obtained and was accompanied by daily measure- 

 ments of the attenuation of blue-green light in the ocean. Water samples 

 and fine-mesh net-hauls were collected for the subsequent analysis of 

 phytoplankton abundance and species composition. The distribution of 

 vertebrates was also studied with special emphasis on oceanic bird distri- 

 but ion . 



Nine scientific papers which are the result of an analysis of 

 certain of the SCOPE data are included in Part 2 of this report. They are: 

 Possible application of a bacterial bioassay in productivity studies , by 

 William Belser; SCOPE measurements of productivity , chlorophyll "a ,r 7 and 

 zooplankton volumes , by R. W. Holmes, M. B. Schaefer, and B. M. Shimada; 

 Size fractionation of phot o sy nt he s i z i ng phytoplankton , by Robert W. Holmes; 

 Diurnal variation in the photosynthesis of natural phytoplankton populations 

 in artificial light , by Robert W. Holmes and Francis T. Haxo; Attachment of 

 marine bacteria to zooplankton , by Galen E. Jones; Preliminary studies of 

 bacterial growth in relation to dark and light fixation of Cl%02 during 

 productivity determinations , by G. E. Jones, W. H. Thomas, and F. T. Haxo; 

 The effects of organic and inorganic micronutrients on the assimilation of 

 Cl^ by planktonic communities and on bacterial multiplication in tropical 

 Pacific sea water , by Galen E. Jones and William H. Thomas; The vertebrates 

 of SCOPE , November 7 - December l6, 19^6 , by Robert Cushman Murphy; The 

 alcohol - soluble and insoluble fractions of the photosynthetically fixed 

 carbon in natura% occurring marine phytoplankton populations , by " 

 William H. Thomas. 



