How to estimate the sex ratios for turtles with temperature-dependent sex determination

by Marc Girondot

I made these videos to explain what I would have liked to know when I started working on this topic 40 years ago. I hope they will help my successors! It is a work in progress.

The thermal reaction norm of sex ratio

Part 1: The basic description of thermal reaction norm of sex ratio

Part 2: The estimation of thermal reaction norm of sex ratio

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Part 3: The comparison of thermal reaction norms of sex ratio

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Part 4: Test for RMU effect on the thermal reaction norm of sex ratio

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Part 5: Test of alternative model: All models are wrong, but some are useful

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Part 6: Why the average incubation temperature must not be used with thermal reaction norm of sex ratio

Part 7: How to consider the intersexes for sex ratio estimation?

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The thermal reaction norm of embryo growth or progress of development

Part 1: The two philosophies to describe the growth of embryos

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Part 2: The parameters of the thermal reaction norm of growth

Code R Emys orbicularis

Code R Caretta caretta

The thermosensitive-period of development for sex determination

Part 1: The thermosensitive period of development for sex determination: The basis

Part 2: How to estimate the thermosensitive period of development for sex determination

Code R for Caretta caretta

The constant-temperature equivalent to be used with thermal reaction norm of sex ratio

The logic behind estimation of CTE

Practical estimation of CTE

Conversion of CTE into sex ratio

Why the incubation length cannot be a proxy of sex ratio

Other informations related to eggs incubations

How to manage statistically the hatching success?

Measuring the thermal heterogeneity of the beach

Bibliography

1     Girondot, M. 1993. Analyse des facteurs génétiques et épigénétiques impliqués dans la détermination du sexe chez les reptiles. PhD Thesis, Université Paris 6- Pierre et Marie Curie.

2     Girondot, M. 1999. Statistical description of temperature-dependent sex determination using maximum likelihood. Evol. Ecol. Res. (IF 1.094), 1, 479-486.

3     Godfrey, M. H., Delmas, V. & Girondot, M. 2003. Assessment of patterns of temperature-dependent sex determination using maximum likelihood model selection. Ecoscience (IF 1.25), 10, 265-272.

4     Hulin, V., Delmas, V., Girondot, M., Godfrey, M. H. & Guillon, J.-M. 2009. Temperature-dependent sex determination and global change: Are some species at greater risk? Oecologia (IF 2.654), 160, 493-506.

5     Abreu-Grobois, F. A., Morales-Mérida, B. A., Hart, C. E., Guillon, J.-M., Godfrey, M. H., Navarro, E. & Girondot, M. 2020. Recent advances on the estimation of the thermal reaction norm for sex ratios. Peerj (IF 2.379), 8, e8451.

6     Girondot, M., Krueger, C. J., Cléomène, C., Tran, Z., Chevallier, D. & Janzen, F. J. 2024. Thermal reaction norms of leatherback marine turtle at nesting beach. Animals (Basel), 14, 3050.