. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLISM OF PELAGIC CEPHALOPODS 267 10-, Is O) 1- t— c\ o O O _o c o <u P co Ej_ X ^~" O 0 200 400 600 800 1000 1200 Minimum Depth of Occurrence (m) Figure 2. Oxygen consumption rates of cephalopods (•). fish ( ). and crustaceans (D) normalized to 10 g wet weight and 5°C as a func- tion of minimum depth of occurrence. Results of ANCOVA show that the slope of the regression for cephalopods is significantly steeper than for either fish (P = ) or crustaceans (P = ) (data from Chil- dress, 1973: Torres
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLISM OF PELAGIC CEPHALOPODS 267 10-, Is O) 1- t— c\ o O O _o c o <u P co Ej_ X ^~" O 0 200 400 600 800 1000 1200 Minimum Depth of Occurrence (m) Figure 2. Oxygen consumption rates of cephalopods (•). fish ( ). and crustaceans (D) normalized to 10 g wet weight and 5°C as a func- tion of minimum depth of occurrence. Results of ANCOVA show that the slope of the regression for cephalopods is significantly steeper than for either fish (P = ) or crustaceans (P = ) (data from Chil- dress, 1973: Torres el a!.. 1979). The one specimen ofOcythoetiiberculata measured in this study was a male caught in an oblique tow from 2500 m to the surface. The animal's excellent physical condition upon reaching the surface suggests that it was caught at a shallow depth near the end of the trawl, but very little is known about its vertical distribution. It had a metabolic rate of ^mol O2 g ' h '. The specimen of Amphitretus pelagian measured was captured in a closing net at night between 700 and 820 m. There is some evidence that the juveniles of the species are found shallower than the adults, but adults have been captured as shallow as 250 m at night (Roper and Young, 1975). Nothing is known of its daytime distribution. Its meta- bolic rate ( /^mole O: g ' rT1) is very close to that of other deep-living pelagic octopods and to I'ainpyro- teitthis injernalix. Seven species of the family Cranchiidae were mea- sured in this study. Limited data and questionable ver- tical distribution information failed to reveal a signifi- cant relationship with depth in these species. He/ico- cranchia pfc/fcri had the highest corrected (to 10 g wet weight) metabolic rate among the Cranchiidae ( //mol O: g'1 h~', n = 6), but was not significantly different from other cranchiid species. Because many cranchiids undergo an ontogenetic migration (Young. 1975a, b), MDO was difficult to pinpoint. I
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
