. Allan Hancock Pacific expeditions. [Reports]. Scientific expeditions. 1—I—r 11 €CHmo-\ '-'^'^nI^-- I I I \00 ZOO 300 400 500 600 700 800 900 1000 1200 /3001400 too Depth in Meters Graph 3. Cumulative standing crop in submarine canyons related to depth, data reduced from Hartman (1963). (Graph 3), because sufficient samples are grouped into several depth classes so as to ameliorate erratic biomass levels. Most striking and per- haps significant is the sudden drop in biomass between 600 and 700 m that may be related to the oxygen minimum layer which occurs between 500 and 700 m in this latitud
. Allan Hancock Pacific expeditions. [Reports]. Scientific expeditions. 1—I—r 11 €CHmo-\ '-'^'^nI^-- I I I \00 ZOO 300 400 500 600 700 800 900 1000 1200 /3001400 too Depth in Meters Graph 3. Cumulative standing crop in submarine canyons related to depth, data reduced from Hartman (1963). (Graph 3), because sufficient samples are grouped into several depth classes so as to ameliorate erratic biomass levels. Most striking and per- haps significant is the sudden drop in biomass between 600 and 700 m that may be related to the oxygen minimum layer which occurs between 500 and 700 m in this latitude (Emery, 1960, p. 108). The standing crop of the depth classes of 100 - 500 m in the canyons approximates that of the typical levels on the outer sandy-silt (or silty- sand) shelf of southern California (compare Barnard and Hartman, 1959, figs. 4-6), in depths of about 60 to 100 m. Echinoderms and echiur- oids represent a larger share of the standing crop in canyons than they do on the outer shelf, this share being taken partly from the polychaetes and especially from the mollusks. DENSITY OF ORGANISMS Polychaetes dominate the benthos of the inshore continental canyons whereas echinoderms are numerically more abundant in the insular can- yons (Tables 2-3, by summation of values in all depth classes). 'I'he. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allan Hancock Foundation. Los Angeles, University of Southern California Press
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