. Bonner zoologische Monographien. Zoology. / o S s 1. 9- — mV 10 15 20 25 35 °C 30 T5 Fig. 15: C02-content of arterial blood in the spotted ground squirrel (Citellus suslicus) at different body temperatures, measured at Tj 18° C. Below, arterial blood pH, measured at different body temperatures (m) and calculated (c) from Person (1952). in mind in order to understand the behaviour of hibernators. Nearly all data on blood pH and blood C02 during torpor were collected at very low Tb. We know of only one observation where Citellus reacted like a Poikilo- thermie organism during the onset of leth
. Bonner zoologische Monographien. Zoology. / o S s 1. 9- — mV 10 15 20 25 35 °C 30 T5 Fig. 15: C02-content of arterial blood in the spotted ground squirrel (Citellus suslicus) at different body temperatures, measured at Tj 18° C. Below, arterial blood pH, measured at different body temperatures (m) and calculated (c) from Person (1952). in mind in order to understand the behaviour of hibernators. Nearly all data on blood pH and blood C02 during torpor were collected at very low Tb. We know of only one observation where Citellus reacted like a Poikilo- thermie organism during the onset of lethargy, when between Tb of 35° and 15° C the arterial pH increased. At very low Tb it was lowered again to its "normal" level. In reality an acidosis developed (Person 1952). In all other species too, during deep hibernation, arterial pH-values have been found which are much lower than can be expected from the shifted neutral point: — (Bartels et al. 1969, Malan et al. 1973). Malan, Arens and Waechter (1973) suggest that this respiratory acidosis may represent a new regulated state (pH ) that is related to the degree of inhibition in the respiratory centre. The new set-point is connected with the rise in [HCO;!] and the elevation of arterial PCo2 (Clausen and Ersland 1968, Johansson and Senturia 1972 b, Kent and Peirce 1967, Malan et al. 1973). Diminished PCo2. 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 Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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