The Company of Biologists

Table 1.

Mass-specific rate of oxygen consumption(sV̇_O₂), heart rate (fH) and mass-specific oxygen pulse (sO₂ pulse) of marine iguanas during pre-exercise and maximum exercise at 27 °C and 36°C

	Body temperature T_b
	27°C			36°C
	Pre-exercise	Maximum exercise	Pre-exercise	Maximum exercise
Santa Cruz animals
sV̇_O₂ (ml g^-1 h^-1)	0.09±0.02	0.47±0.07^{^†}	0.14±0.03^{^*}	0.68±0.06^{^*},^{^†}
fH (beats min^-1)	32.3±4.8	60.4±4.2^{^†}	62.7±5.5^{^*}	106±3.7^{^*},^{^†}
sO₂ pulse (μl g^-1 beat^-1)	0.047±0.010	0.130±0.018^{^†}	0.037±0.008	0.107±0.007^{^*},^{^†}
Santa Fé animals
sV̇_O₂ (ml g^-1 h^-1)	—	—	0.15±0.04	0.60±0.09^{^†}
fH (beats min^-1)	—	—	57.4±1.0	99.3±7.6^{^†}
sO₂ pulse (μl g^-1 beat^-1)	—	—	0.044±0.011	0.102±0.016^{^†}

	Body temperature T_b
	27°C			36°C
	Pre-exercise	Maximum exercise	Pre-exercise	Maximum exercise
Santa Cruz animals
sV̇_O₂ (ml g^-1 h^-1)	0.09±0.02	0.47±0.07^{^†}	0.14±0.03^{^*}	0.68±0.06^{^*},^{^†}
fH (beats min^-1)	32.3±4.8	60.4±4.2^{^†}	62.7±5.5^{^*}	106±3.7^{^*},^{^†}
sO₂ pulse (μl g^-1 beat^-1)	0.047±0.010	0.130±0.018^{^†}	0.037±0.008	0.107±0.007^{^*},^{^†}
Santa Fé animals
sV̇_O₂ (ml g^-1 h^-1)	—	—	0.15±0.04	0.60±0.09^{^†}
fH (beats min^-1)	—	—	57.4±1.0	99.3±7.6^{^†}
sO₂ pulse (μl g^-1 beat^-1)	—	—	0.044±0.011	0.102±0.016^{^†}

Values are means ± S.D.

N=7 marine iguanas from Santa Cruz Island, Galapagos, N=4 for iguanas from Santa Fé Island, Galapagos.

Denotes a significant difference between comparable variables at 27°C and 36°C.

^†

Denotes a significant difference between pre-exercise and maximum exercise at a given temperature.

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