The relationship of blood oxygen affinity to body size in lizards

Basal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body composition

“…The values for lizards in Table 7 are calculated from the observations for mature animals listed by Pough (1977a), except for the deletion of the extraordinarily low P 50 value of Hemidactylus bibroni, which is about half the value of the next lowest observation. Owing to insufficient information, the P 50 estimates for insectivores are from two species only, with 11 observations on shrews and six on moles (Bartels et al, 1969).…”

Basal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body composition

“…The values for lizards in Table 7 are calculated from the observations for mature animals listed by Pough (1977a), except for the deletion of the extraordinarily low P 50 value of Hemidactylus bibroni, which is about half the value of the next lowest observation. Owing to insufficient information, the P 50 estimates for insectivores are from two species only, with 11 observations on shrews and six on moles (Bartels et al, 1969).…”

Does size matter for hypoxia tolerance in fish?

“…The ability to take up oxygen in hypoxia will also be influenced by the oxygen affinity of haemoglobin in blood. There are results suggesting that the half‐saturation pressure for oxygen binding to haemoglobin (the P 50 value) increases with body mass in mammals (Schmidt‐Nielsen & Larimer, 1958), birds (Lutz, Longmuir & Schmidt‐Nielsen, 1974) and lizards (Pough, 1977 b ), while it decreases with body mass in snakes (Pough, 1977 a ). However, it has been suggested that the apparent scaling of P 50 in mammals is an experimental artefact caused by inappropriate P CO 2 and pH values during measurements and that the oxygen affinity of blood in vivo is independent of body size (Steen, 1971; Lahiri, 1975).…”

Vertebrate Hemoglobins

“…Among the lower vertebrates, the relationship between blood oxygen affinity and body size has been examined in several groups of reptiles. Bennett (48) and Pough (450) presented evidence that blood oxygen affinity is directly related to body mass among numerous species of lizard. In contrast, Pough (449) found an inverse relationship between blood oxygen affinity and body mass among the colubrid snakes.…”

Basal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body composition

“…The values for lizards in Table 7 are calculated from the observations for mature animals listed by Pough (1977a), except for the deletion of the extraordinarily low P 50 value of Hemidactylus bibroni, which is about half the value of the next lowest observation. Owing to insufficient information, the P 50 estimates for insectivores are from two species only, with 11 observations on shrews and six on moles (Bartels et al, 1969).…”

Does size matter for hypoxia tolerance in fish?

“…The ability to take up oxygen in hypoxia will also be influenced by the oxygen affinity of haemoglobin in blood. There are results suggesting that the half‐saturation pressure for oxygen binding to haemoglobin (the P 50 value) increases with body mass in mammals (Schmidt‐Nielsen & Larimer, 1958), birds (Lutz, Longmuir & Schmidt‐Nielsen, 1974) and lizards (Pough, 1977 b ), while it decreases with body mass in snakes (Pough, 1977 a ). However, it has been suggested that the apparent scaling of P 50 in mammals is an experimental artefact caused by inappropriate P CO 2 and pH values during measurements and that the oxygen affinity of blood in vivo is independent of body size (Steen, 1971; Lahiri, 1975).…”

Vertebrate Hemoglobins

“…Among the lower vertebrates, the relationship between blood oxygen affinity and body size has been examined in several groups of reptiles. Bennett (48) and Pough (450) presented evidence that blood oxygen affinity is directly related to body mass among numerous species of lizard. In contrast, Pough (449) found an inverse relationship between blood oxygen affinity and body mass among the colubrid snakes.…”

Basal metabolic rate scaled to body mass between species by the fractal dimension of the vascular system and body composition

“…The values for lizards in Table 7 are calculated from the observations for mature animals listed by Pough (1977a), except for the deletion of the extraordinarily low P 50 value of Hemidactylus bibroni, which is about half the value of the next lowest observation. Owing to insufficient information, the P 50 estimates for insectivores are from two species only, with 11 observations on shrews and six on moles (Bartels et al, 1969).…”

Does size matter for hypoxia tolerance in fish?

“…The ability to take up oxygen in hypoxia will also be influenced by the oxygen affinity of haemoglobin in blood. There are results suggesting that the half‐saturation pressure for oxygen binding to haemoglobin (the P 50 value) increases with body mass in mammals (Schmidt‐Nielsen & Larimer, 1958), birds (Lutz, Longmuir & Schmidt‐Nielsen, 1974) and lizards (Pough, 1977 b ), while it decreases with body mass in snakes (Pough, 1977 a ). However, it has been suggested that the apparent scaling of P 50 in mammals is an experimental artefact caused by inappropriate P CO 2 and pH values during measurements and that the oxygen affinity of blood in vivo is independent of body size (Steen, 1971; Lahiri, 1975).…”

Vertebrate Hemoglobins

“…Among the lower vertebrates, the relationship between blood oxygen affinity and body size has been examined in several groups of reptiles. Bennett (48) and Pough (450) presented evidence that blood oxygen affinity is directly related to body mass among numerous species of lizard. In contrast, Pough (449) found an inverse relationship between blood oxygen affinity and body mass among the colubrid snakes.…”