POINT 



SAN 

 EUGENIO 



116" W. 



115° 114° 113° 112° 111° 110' 



FiGUKE 2. — Localities and topograpliic feaitures referred to in the paper. 



I 



figures identify the stations that were occupied 

 close to local noon and midnight so as to indicate 

 approximately which portions of the track were 

 covered in daylight and which in darkness. 



Although many physical, chemical, and biolog- 

 ical properties were measured at several deptlis at 

 most stations, this paper is concerned only with 

 data on surface temperature, standing stock of 

 phytoplankton, pelagic crabs, and tunas, for rea- 

 sons given earlier. The stock of phytoplankton was 

 measured as concentration of chlorophyll a, and in 

 this paper I discuss only surface concentrations. 



which were measured much more often than con- 

 centrations at other levels. 



SURFACE TEMPERATURE 



The term "surface temperature" is used for con- 

 venience, for the temperature data in this paper 

 are not precisely from the sea surface. Mainly they 

 are from 10 m. below the surface, where tempera- 

 ture was measured at almost every station witli a 

 reversing thermometer. Temperatures read from 

 bucket thermometers, bathythermographs, and 

 thermographs that recorded sea-water injection 



152 



U.S. FISH AND WILDLIFE SERVICE 



