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Table 3.

Thermal effects on the enzyme activities of white muscle at different transverse body positions (see Fig. 4) in two lamnid shark species

		Lactate dehydrogenase					Citrate synthase
	Body mass (kg)	Slope^{^*}(±95% C.I.)	N; r²	Q₁₀ for range 5-30°C^{^†}(+, -95% C.I.)	Slope^{^*}(±95% C.I.)	N, r²	Q₁₀ for range 5-30°C^† (+, -95% C.I.)
Isurus oxyrinchus
Close to RM	6	0.23±0.05	6; 0.97	1.69 (+0.21, -0.19)	0.22±0.61^‡	3; 0.95^‡	1.64 (+5.1, -1.2)^‡
Midway to RM	6	0.24±0.07	6; 0.96	1.73 (+0.29, -0.25)	0.33±0.71^‡	3; 0.97^‡	2.14 (+8.9, -1.7)^‡
Under the skin	6	0.22±0.05	6; 0.97	1.66 (+0.22, -0.19)	0.28±0.01^‡	3; 0.99^‡	1.91 (+0.04,-0.04)^‡
Close to RM	49	0.28±0.05	6; 0.98	1.90 (+0.25, -0.22)	0.27±0.12	6; 0.90	1.86 (+0.60, -0.46)
Midway to RM	49	0.25±0.05	6; 0.98	1.77 (+0.22, -0.19)	0.37±0.17	6; 0.90	2.35 (+1.16, -0.77)
Under the skin	49	0.24±0.03	6; 0.99	1.77 (+0.11, -0.10)	0.23±0.09	6; 0.92	1.69 (+0.40, -0.32)
Lamna ditropis
Close to RM	127	0.19±0.05	6; 0.96	1.55 (+0.21, -0.18)	0.25±0.06	6; 0.97	1.76 (+0.27, -0.23)
Midway to RM	127	0.26±0.06	6; 0.98	1.82 (+0.25, -0.22)	0.23±0.03	6; 0.99	1.68 (+0.16, -0.14)
Under the skin	127	0.21±0.03	6; 0.99	1.61 (+0.11, -0.11)	0.21±0.03	6; 0.99	1.61 (+0.10, -0.10)
Close to RM	136	0.25±0.06	6; 0.97	1.76 (+0.26, -0.23)	0.22±0.08	6; 0.94	1.67 (+0.33, -0.28)
Midway to RM	136	0.25±0.10	6; 0.92	1.77 (+0.48, -0.38)	0.17±0.03	6; 0.98	1.48 (+0.11, -0.11)
Under the skin	136	0.24±0.02^§	4; 0.99^§	1.73 (+0.08,-0.08)^{^§}	0.24±0.06	6; 0.96	1.72 (+0.27, -0.23)

		Lactate dehydrogenase					Citrate synthase
	Body mass (kg)	Slope^{^*}(±95% C.I.)	N; r²	Q₁₀ for range 5-30°C^{^†}(+, -95% C.I.)	Slope^{^*}(±95% C.I.)	N, r²	Q₁₀ for range 5-30°C^† (+, -95% C.I.)
Isurus oxyrinchus
Close to RM	6	0.23±0.05	6; 0.97	1.69 (+0.21, -0.19)	0.22±0.61^‡	3; 0.95^‡	1.64 (+5.1, -1.2)^‡
Midway to RM	6	0.24±0.07	6; 0.96	1.73 (+0.29, -0.25)	0.33±0.71^‡	3; 0.97^‡	2.14 (+8.9, -1.7)^‡
Under the skin	6	0.22±0.05	6; 0.97	1.66 (+0.22, -0.19)	0.28±0.01^‡	3; 0.99^‡	1.91 (+0.04,-0.04)^‡
Close to RM	49	0.28±0.05	6; 0.98	1.90 (+0.25, -0.22)	0.27±0.12	6; 0.90	1.86 (+0.60, -0.46)
Midway to RM	49	0.25±0.05	6; 0.98	1.77 (+0.22, -0.19)	0.37±0.17	6; 0.90	2.35 (+1.16, -0.77)
Under the skin	49	0.24±0.03	6; 0.99	1.77 (+0.11, -0.10)	0.23±0.09	6; 0.92	1.69 (+0.40, -0.32)
Lamna ditropis
Close to RM	127	0.19±0.05	6; 0.96	1.55 (+0.21, -0.18)	0.25±0.06	6; 0.97	1.76 (+0.27, -0.23)
Midway to RM	127	0.26±0.06	6; 0.98	1.82 (+0.25, -0.22)	0.23±0.03	6; 0.99	1.68 (+0.16, -0.14)
Under the skin	127	0.21±0.03	6; 0.99	1.61 (+0.11, -0.11)	0.21±0.03	6; 0.99	1.61 (+0.10, -0.10)
Close to RM	136	0.25±0.06	6; 0.97	1.76 (+0.26, -0.23)	0.22±0.08	6; 0.94	1.67 (+0.33, -0.28)
Midway to RM	136	0.25±0.10	6; 0.92	1.77 (+0.48, -0.38)	0.17±0.03	6; 0.98	1.48 (+0.11, -0.11)
Under the skin	136	0.24±0.02^§	4; 0.99^§	1.73 (+0.08,-0.08)^{^§}	0.24±0.06	6; 0.96	1.72 (+0.27, -0.23)

RM, red muscle.

The thermal rate coefficient (Q₁₀) was estimated from the slope of the linear regression of log₁₀(activity at T_n) vs[(T_n-T_n-1)×0.1], where T_n is the assay temperature (in °C) and the Q₁₀ is equal to 10^slope(Schmidt-Nielsen, 1993).

†

Note that the uneven confidence intervals (C.I.) are due to the log₁₀ transformation required to calculate Q₁₀ (see footnote ^*).

‡

Activities measured at 5°C, 15°C and 25°C only.

Activities not determined at 5°C and 10°C.

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