. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I" I If < I I-HM',I'<;I, III -.\i,< VANIN M '.' TON 73. f. 5 4 = '' 2 1 0 ' 6 ' 7/, pH Figure 4. Mill coefficient'. '•, hemocyanin de- pending <m pM and temperature. Bolet/ky, 1983;. In contrast, the extreme thermal sensitivity •'I /' , seen in gianl squid may eliminate oxygen transport by hcmocyanin and contribute to the heat intolerance of these animals (Brix. 1983;. The very small adjustments of Pw found in M. \cnoi hemocyanin (A/',,/A'/ \:\\\] ' . pH ; may also be detrimental,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I" I If < I I-HM',I'<;I, III -.\i,< VANIN M '.' TON 73. f. 5 4 = '' 2 1 0 ' 6 ' 7/, pH Figure 4. Mill coefficient'. '•, hemocyanin de- pending <m pM and temperature. Bolet/ky, 1983;. In contrast, the extreme thermal sensitivity •'I /' , seen in gianl squid may eliminate oxygen transport by hcmocyanin and contribute to the heat intolerance of these animals (Brix. 1983;. The very small adjustments of Pw found in M. \cnoi hemocyanin (A/',,/A'/ \:\\\] ' . pH ; may also be detrimental, because when temperature rises, blood l'<, will be held at levels too low to adequately support an increase in metabolic rate. In consequence. Antarctic octopods like M. \cnni are very steriothermal (Portner and Zielinski. 1998) For .V. o//n•inuli't the greatest pH sensitivity (Fig. 3j at 20 °C was found in the range of in \i\» blood pH ( at 17-19 <": Johanscn li%o pealei bkxxl in vitro (Howell and Gilbert. 1976;, the in vivo pH range for M. senoi is between pH and at 0 ''C. With the highest pH sensitivity in this pH range, oxygen unloading would occur at very low oxygen tensions ( below 1 kPa (pH ; 0 r'C) reflects one of the highest oxygen affinities reported so far for cephalopods. This value is close to the /' of to kPa evaluated for the cold-water vam- pire squid Vampyroteuthis infernalis (5 °C; Seibel el al., 19991. These findings suggest that M. senoi displays a low metabolic rate similar to that of the Antarctic octopod Pareledone charcoli ( /nmol g ' h ' at 0 °C and about nody weight; H. O. Portner. T. Hirse, V. Wegewit/, unpubl data. I S times lower than similar si/ed .V. offu imilis at 17 f. 1 .4 //mol •.' ' h '. 19H2b;oreven lower and close to the //mol g ' h ' measured at ' in the deep-sea squid Vn/n/>.mii-mlu- //// 'Sei1 al 1997). The Bohr coefficient evaluated for both investigated ceph
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
