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Table 2 Incubation times at constant temperatures and Q10 for development rate for two species of tuatara.

From: Support for a rare pattern of temperature-dependent sex determination in archaic reptiles: evidence from two species of tuatara (Sphenodon)

Constant incubation temperature (°C)

Mean days to hatchinga (n hatchlings)

Q10

Source

S. guntheri (North Brother I.)

   

18.3

263 (12)

 

N. Mitchell, this study

20.9

182 (12)

4.14 (18.3–20.9)

N. Mitchell, this study

22.1

160 (15)

2.91 (20.9–22.1)

N. Mitchell, this study

23.1

152 (11)

1.68 (22.1–23.1)

N. Mitchell, this study

S. punctatus (Stephens I.)

   

15

764 (1)b

 

Thompson 1990 [14]

18

328 (29)

 

Thompson 1990 [14]

18.3

264 (105)

25.03 (15–18.3)

Nelson et al. 2004 [32]

20

247 (12)

 

Thompson 1989 [44]

20

253 (64)

 

Thompson 1990 [14]

21.3

183 (80)

3.39 (18.3–21.3)

Nelson et al. 2004 [32]

21.5

173 (5)c

 

A. Cree, this study

22

169 (32)

 

Thompson 1990 [14]

22.6

166 (113)

2.12 (21.3–22.6)

Nelson et al. 2004 [32]

24.1

151 (5)c

 

A. Cree, this study

25

150 (2)

1.53 (22.6–25)

Thompson 1990 [14]

  1. aDays to hatching includes short periods spent in natural nests, in transit from field sites to incubators, or in an 18°C incubator (range 2–20 days)
  2. bIncubation time derived from an embryo that pipped the eggshell but did not hatch [14]. The true 15–18.3°C Q10 could be lower if this embryo had completed development earlier but could not hatch.
  3. cData from a successful, but as yet unsexed clutch