. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLISM OF PELAGIC CEPHALOPODS 269 1-r .2 w O v c o 0 P >! §- X ^ o I t I I > > I t I I I I I I I I 1-4 t I I I I | t t t * I * I I I I 0 10 20 30 40 50 60 Vo Oxygen Partial Pressure (mm Hg) Figure 4. Mean oxygen consumption rates (/imol O: g 'h '(aver- aged o\er 2-min intervals as a function of available oxygen (mm Hg) at 5°C. Individuals from five species are plotted. Mean critical partial pressures are ± mm Hg for Vampyroieuthis infemalis (A), mm Hg for Japetella healhi (•). ± mm Hg
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLISM OF PELAGIC CEPHALOPODS 269 1-r .2 w O v c o 0 P >! §- X ^ o I t I I > > I t I I I I I I I I 1-4 t I I I I | t t t * I * I I I I 0 10 20 30 40 50 60 Vo Oxygen Partial Pressure (mm Hg) Figure 4. Mean oxygen consumption rates (/imol O: g 'h '(aver- aged o\er 2-min intervals as a function of available oxygen (mm Hg) at 5°C. Individuals from five species are plotted. Mean critical partial pressures are ± mm Hg for Vampyroieuthis infemalis (A), mm Hg for Japetella healhi (•). ± mm Hg for Japetella dui- pluimi ( + ), ± mm Hg for Histioteuihis heleropsis (A), and for Bathyieuthis ahyssicola (D). Regulation The regulation of oxygen consumption at 5°C was in- vestigated in five species of pelagic cephalopods (Fig. 4). Critical partial pressures of oxygen (Pc) are presented in Table II. Vampyroteuthis infemalis, which lives perma- nently within the well-developed oxygen minimum layer ofFCalifornia, had a mean Pc of ± mm Hg (n = 6), which is comparable to that of the mysid Gnathophaitsia ingens (Childress, 1968; Sanders and Childress, 1990). One individual of I'. infemalis demonstrated regulatory abilities down to mm Hg, considerably lower than the minimum A> of 6 mm Hg found within the Califor- nia oxygen minimum layer. Similarly, Japetella heathi, a bathypelagic octopod found off the California coast, was capable of regulating its oxygen consumption to as low as mm Hg (n = 2). Japetella diaphana off Ha- waii, however, is apparently able to regulate its oxygen consumption to only ± mm Hg (/; = 3), despite a metabolic rate very similar to that observed for J. hea- thi (Table I). Bathyteuthis abyssicola from Hawaii regu- lated to 18 mm Hg (/; = 2). The regulatory abilities of/ diaphana and B. abyssicola are consistent with the min- imum value of 20 mm Hg found for the partial pressure of oxygen within the Hawai
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
