NO. 2 OLGA HARTMAN : SUBMARINE CANYONS 55 



If productivity is estimated in terms of grams per cuft of sediment, 

 the results will show that northern, longshore canyons usually yield 

 more than offshore ones ; the exceptions are Catalina canyon, which 

 ranks fourth, and Tanner canyon which is eighth. In the following 

 estimates the samples from Redondo canyon are reduced from 54 to 

 32, and their total volumes from 92.36 to 27.62 cuft because 22 of 

 the samples come from fan, or subsill depths. These values, from 

 highest to lowest, are as follows: 



Monterey canyon, with 59 grams/ cuft. or 2082 gm/ m^ 

 Redondo canyon, with 34 gm/ cuft. or 1200 gm/ m^ 

 Hueneme canyon, with 25.5 gm/ cuft. or 900 gm/ m^ 

 Catalina canyon, with 22 gm/ cuft. or 776.4 gm/ m^ 

 Mugu canyon, with 14.3 gm/ cuft. or 504.6 gm/ m^ 

 Newport canyon, with 14 gm/ cuft. or 494.1 gm/ m^ 

 Dume canyon, with 13.4 gm/ cuft. or 472.9 gm/ m^ 

 Tanner canyon, with 8.7 gm/ cuft. or 306.0 gm/ m^ 

 San Pedro sea valley, with 8.1 gm/ cuft. or 285.8 gm/ m^ 

 Coronado canyon, with 8.0 gm/ cuft. or 282.3 gm/ m^ 

 Santa Cruz canyon, with 7.0 gm/ cuft. or 237.0 gm/ m^ 

 La Jolla canyon, with 6.4 gm/ cuft. or 225.9 gm/ m^ 

 Santa Monica canyon, with 4.0 gm/ cuft. or 141.2 gm/ m^ 

 all others, less than 1 gram per cuft. or 35.3 gm/ m^ 



The yields in individual samples reached a high of 814 grams to a 

 square meter in Hueneme canyon and varied to 64.2 grams in Tanner 

 canyon ; these values are expressed by canyon, with depth, and biomass 

 rerated to grams to a square meter : 



Hueneme canyon, with 814 gm/ m^, in 373 meters. 

 Redondo canyon, with 532.84 gm/ m^, in 560 meters. 

 Newport canyon, with 506.4 gm/ m^, in 21 1 meters. 

 Mugu canyon, with 427.2 gm/ m^, in 177 meters. 

 Catalina canyon, with 330.6 gm/ m^, in 88 meters. 

 Dume canyon, with 307.4 gm/ m^, in 299 meters. 

 Santa Cruz canyon, with 293.6 gm/ m^, in 459 meters. 

 Coronado canyon, with 21 1.4 gm/ m^, in 960 meters. 

 Santa Monica canyon, with 165.2 gm/ m^, in 268 meters. 

 La Jolla canyon, with 163.6 gm/ m^, in 121 meters. 

 Tanner canyon, with 64.2 gm/ m^, in 496 meters. 



