TEMPERATURE, TIME, AND REPTILE EGG WATER EXCHANGE
In: Israel Journal of Ecology and EvolutionSearch for other papers by RALPH A. ACKERMAN in
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The effect of incubation temperature (T, °C) on the developmental rate (Rd, days−1) and water exchange of reptile eggs is examined. The relationship between Rd and T can be described using the Arrhenius equation. The free energy (E) of this relationship is around 50 kJ·mol−1, equivalent to a Q10 of 2, for all the species examined. The data indicate that the Rd's of reptile eggs are sensitive to changes in T to about the same extent. However, there may be biologically important variation in sensitivity to T. The thermal tolerance range (TTR) of reptile eggs, on the other hand, varies substantially but appears to be around 10°C or less. Egg water exchange on a rate basis (ṀH2O, mg·day−1) is influenced by T and increases by a factor of around 1.9 for every 10°C increase in T. The change in ṀH2O with T is offset by the increase in Rd which decreases the incubation period (I, days) so that total egg water exchange (MH2O, g) is not influenced by T for eggs whose Rd's have Q10's around 1.9. Eggs whose Rd's diverge from 1.9 should demonstrate a progressive effect of T on MH2O. The ṀH2O and MH2O of eggs is influenced by the thermal conductivity of the medium in which the eggs incubate. This occurs because the vapor pressure of the egg during incubation will change relative to the vapor pressure of the medium due to the influence of medium thermal conductivity on metabolic self-heating by the egg.
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| All Time | Past 365 days | Past 30 Days | |
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TEMPERATURE, TIME, AND REPTILE EGG WATER EXCHANGE
In: Israel Journal of Ecology and EvolutionSearch for other papers by RALPH A. ACKERMAN in
Current site
Google Scholar
PubMed
The effect of incubation temperature (T, °C) on the developmental rate (Rd, days−1) and water exchange of reptile eggs is examined. The relationship between Rd and T can be described using the Arrhenius equation. The free energy (E) of this relationship is around 50 kJ·mol−1, equivalent to a Q10 of 2, for all the species examined. The data indicate that the Rd's of reptile eggs are sensitive to changes in T to about the same extent. However, there may be biologically important variation in sensitivity to T. The thermal tolerance range (TTR) of reptile eggs, on the other hand, varies substantially but appears to be around 10°C or less. Egg water exchange on a rate basis (ṀH2O, mg·day−1) is influenced by T and increases by a factor of around 1.9 for every 10°C increase in T. The change in ṀH2O with T is offset by the increase in Rd which decreases the incubation period (I, days) so that total egg water exchange (MH2O, g) is not influenced by T for eggs whose Rd's have Q10's around 1.9. Eggs whose Rd's diverge from 1.9 should demonstrate a progressive effect of T on MH2O. The ṀH2O and MH2O of eggs is influenced by the thermal conductivity of the medium in which the eggs incubate. This occurs because the vapor pressure of the egg during incubation will change relative to the vapor pressure of the medium due to the influence of medium thermal conductivity on metabolic self-heating by the egg.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 738 | 84 | 22 |
| Full Text Views | 21 | 0 | 0 |
| PDF Views & Downloads | 18 | 0 | 0 |
