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Figure 3 | Frontiers in Zoology

Figure 3

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

Figure 3

Development of S. guntheri embryos under a temperature regime designed to mimic the natural incubation environment. These experiments, conducted in three successive years (1989–1991), always produced males. The proportion of development completed (heavy line) was estimated from development rates at constant temperatures adjusted to set incubator temperatures using Q10 for S. guntheri, and a Q10 for S. punctatus for temperatures below 18°C (Table 2). Because incubator temperatures only exceeded the pivotal temperature (21.57°C) over a single developmental window, we infer that the TSP for tuatara occurs wholly or partially within 0.25 and 0.55 of development.

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