Table 2 Open in new tab Oxygen uptake...

Population

Body size range (g)

Holding temperature fluctuation (°C)

Chase temperature (°C)

MMR (mg O₂ kg⁻¹ L⁻¹)

RMR (mg O₂ kg⁻¹ L⁻¹)

AAS (mg O₂ kg⁻¹ L⁻¹)

FAS

CT_MAX start temperature (°C)

CT_MAX (°C)

Lower Deschutes

6.0–48.4

18–22

10.62 ± 0.54^a

2.85 ± 0.12^a

7.78 ± 0.61

3.76 ± 0.25^a

32.06 ± 0.08^a

20–24

12.72 ± 0.29^b

3.88 ± 0.24^b

8.84 ± 0.29

3.34 ± 0.15^ab

31.43 ± 0.06^b

23–27

12.59 ± 0.56^b

4.60 ± 0.21^b

7.99 ± 0.47

2.76 ± 0.12^b

31.31 ± 0.11^b

John Day

21.3–78.9

14–27

12.85 ± 0.89

2.42 ± 0.10^d

10.42 ± 0.91^d

5.42 ± 0.47^d

31.22 ± 0.07

20–24

15.23 ± 0.99

4.13 ± 0.28^d

11.09 ± 0.83^d

3.72 ± 0.20^e

n/a

Not measured

23–27

12.89 ± 1.74

6.56 ± 1.08^e

6.32 ± 1.11^e

2.21 ± 0.33^f

31.16 ± 0.08

Siletz

15.1–44.2

15–19

12.27 ± 0.55

1.72 ± 0.09^g

10.55 ± 0.50^g

7.17 ± 0.36^g

28.84 ± 0.09^g

18–22

13.86 ± 0.66

2.72 ± 0.23^h

11.14 ± 0.49^g

5.25 ± 0.23^gh

29.50 ± 0.11^h

20–24

12.28 ± 1.45

3.19 ± 0.28^h

9.10 ± 1.49^g

4.02 ± 0.48^h

30.24 ± 0.09ⁱ

23–26

11.06 ± 0.52

4.70 ± 0.26ⁱ

6.36 ± 0.33^h

2.36 ± 0.07ⁱ

n/a

Not measured

North Umpqua

9.7–42.1

16–19

9.76 ± 0.46

1.94 ± 0.09^j

7.82 ± 0.49^j

5.17 ± 0.37^j

30.04 ± 0.33

18–22

10.20 ± 0.47

2.37 ± 0.05^j

7.83 ± 0.48^j

4.33 ± 0.22^j

29.88 ± 0.25

20–24

10.15 ± 0.64

3.08 ± 0.09^k

7.07 ± 0.64^jk

3.31 ± 0.21^k

30.03 ± 0.25

23–26

9.54 ± 0.38

3.84 ± 0.18^l

5.70 ± 0.35^k

2.52 ± 0.11^k

29.91 ± 0.38

Table 2

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Oxygen uptake rates (MMR, RMR) at chase temperatures; AAS, FAS and CT_MAX for each temperature treatment and population

Population	Body size range (g)	Holding temperature fluctuation (°C)	Chase temperature (°C)	MMR (mg O₂ kg⁻¹ L⁻¹)	RMR (mg O₂ kg⁻¹ L⁻¹)	AAS (mg O₂ kg⁻¹ L⁻¹)	FAS	CT_MAX start temperature (°C)	CT_MAX (°C)
Lower Deschutes	6.0–48.4	18–22	19	10.62 ± 0.54^a	2.85 ± 0.12^a	7.78 ± 0.61	3.76 ± 0.25^a	20	32.06 ± 0.08^a
		20–24	22	12.72 ± 0.29^b	3.88 ± 0.24^b	8.84 ± 0.29	3.34 ± 0.15^ab	22	31.43 ± 0.06^b
		23–27	26	12.59 ± 0.56^b	4.60 ± 0.21^b	7.99 ± 0.47	2.76 ± 0.12^b	26	31.31 ± 0.11^b
John Day	21.3–78.9	14–27	19	12.85 ± 0.89	2.42 ± 0.10^d	10.42 ± 0.91^d	5.42 ± 0.47^d	21	31.22 ± 0.07
		20–24	22	15.23 ± 0.99	4.13 ± 0.28^d	11.09 ± 0.83^d	3.72 ± 0.20^e	n/a	Not measured
		23–27	27	12.89 ± 1.74	6.56 ± 1.08^e	6.32 ± 1.11^e	2.21 ± 0.33^f	26	31.16 ± 0.08
Siletz	15.1–44.2	15–19	16	12.27 ± 0.55	1.72 ± 0.09^g	10.55 ± 0.50^g	7.17 ± 0.36^g	16	28.84 ± 0.09^g
		18–22	19	13.86 ± 0.66	2.72 ± 0.23^h	11.14 ± 0.49^g	5.25 ± 0.23^gh	20	29.50 ± 0.11^h
		20–24	22	12.28 ± 1.45	3.19 ± 0.28^h	9.10 ± 1.49^g	4.02 ± 0.48^h	22	30.24 ± 0.09ⁱ
		23–26	25	11.06 ± 0.52	4.70 ± 0.26ⁱ	6.36 ± 0.33^h	2.36 ± 0.07ⁱ	n/a	Not measured
North Umpqua	9.7–42.1	16–19	16	9.76 ± 0.46	1.94 ± 0.09^j	7.82 ± 0.49^j	5.17 ± 0.37^j	18	30.04 ± 0.33
		18–22	19	10.20 ± 0.47	2.37 ± 0.05^j	7.83 ± 0.48^j	4.33 ± 0.22^j	19	29.88 ± 0.25
		20–24	22	10.15 ± 0.64	3.08 ± 0.09^k	7.07 ± 0.64^jk	3.31 ± 0.21^k	22	30.03 ± 0.25
		23–26	25	9.54 ± 0.38	3.84 ± 0.18^l	5.70 ± 0.35^k	2.52 ± 0.11^k	25	29.91 ± 0.38

Population	Body size range (g)	Holding temperature fluctuation (°C)	Chase temperature (°C)	MMR (mg O₂ kg⁻¹ L⁻¹)	RMR (mg O₂ kg⁻¹ L⁻¹)	AAS (mg O₂ kg⁻¹ L⁻¹)	FAS	CT_MAX start temperature (°C)	CT_MAX (°C)
Lower Deschutes	6.0–48.4	18–22	19	10.62 ± 0.54^a	2.85 ± 0.12^a	7.78 ± 0.61	3.76 ± 0.25^a	20	32.06 ± 0.08^a
		20–24	22	12.72 ± 0.29^b	3.88 ± 0.24^b	8.84 ± 0.29	3.34 ± 0.15^ab	22	31.43 ± 0.06^b
		23–27	26	12.59 ± 0.56^b	4.60 ± 0.21^b	7.99 ± 0.47	2.76 ± 0.12^b	26	31.31 ± 0.11^b
John Day	21.3–78.9	14–27	19	12.85 ± 0.89	2.42 ± 0.10^d	10.42 ± 0.91^d	5.42 ± 0.47^d	21	31.22 ± 0.07
		20–24	22	15.23 ± 0.99	4.13 ± 0.28^d	11.09 ± 0.83^d	3.72 ± 0.20^e	n/a	Not measured
		23–27	27	12.89 ± 1.74	6.56 ± 1.08^e	6.32 ± 1.11^e	2.21 ± 0.33^f	26	31.16 ± 0.08
Siletz	15.1–44.2	15–19	16	12.27 ± 0.55	1.72 ± 0.09^g	10.55 ± 0.50^g	7.17 ± 0.36^g	16	28.84 ± 0.09^g
		18–22	19	13.86 ± 0.66	2.72 ± 0.23^h	11.14 ± 0.49^g	5.25 ± 0.23^gh	20	29.50 ± 0.11^h
		20–24	22	12.28 ± 1.45	3.19 ± 0.28^h	9.10 ± 1.49^g	4.02 ± 0.48^h	22	30.24 ± 0.09ⁱ
		23–26	25	11.06 ± 0.52	4.70 ± 0.26ⁱ	6.36 ± 0.33^h	2.36 ± 0.07ⁱ	n/a	Not measured
North Umpqua	9.7–42.1	16–19	16	9.76 ± 0.46	1.94 ± 0.09^j	7.82 ± 0.49^j	5.17 ± 0.37^j	18	30.04 ± 0.33
		18–22	19	10.20 ± 0.47	2.37 ± 0.05^j	7.83 ± 0.48^j	4.33 ± 0.22^j	19	29.88 ± 0.25
		20–24	22	10.15 ± 0.64	3.08 ± 0.09^k	7.07 ± 0.64^jk	3.31 ± 0.21^k	22	30.03 ± 0.25
		23–26	25	9.54 ± 0.38	3.84 ± 0.18^l	5.70 ± 0.35^k	2.52 ± 0.11^k	25	29.91 ± 0.38

All values are presented as mean ± SEM. All metabolic rate data are scaled to a common body size of 25 g. Differing letters indicate statistically significant differences between temperature treatments within populations (one-way ANOVA or Kruskal–Wallis test; P < 0.05; Deschutes River: a,b; John Day River: d,e,f; Siletz River: g,h,i; North Umpqua River: j,k,l).

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