DOI: 10.5061/dryad.866t1g1xx
title: Data from: The thermal sensitivity of growth and survival in a wild reptile with temperature-dependent sex determination

description: The Charnov-Bull hypothesis is the leading explanation for the evolution
 of environmental sex determination (ESD), which includes
 temperature-dependent sex determination (TSD), the most common form of
 ESD. Charnov-Bull predicts a sex-by-incubation temperature interaction for
 fitness, matching offspring sex with thermal conditions that increase
 parental fitness. However, there is no general explanation for how the
 sex-by-temperature interaction arises. Two competing explanations for the
 interaction lie in the Survival to Maturity hypothesis (SM) and the
 Trivers-Willard extension (TW). Under SM, the sex that matures later is
 produced under optimal incubation regimes as the late-maturing sex accrues
 more mortality by maturation, while TW suggests that males are always
 produced under optimal incubation regimes as male mating success is more
 sensitive to condition (general health, vigor) than female fecundity. In a
 system where females mature later than males, as in the painted turtle
 (Chrysemys picta), SM and TW generate opposite predictions for the effect
 of incubation temperature on juvenile survival. We incubated C. picta eggs
 under either female-promoting temperatures (28±3°C) or male-promoting
 temperatures (25±3°C), then released the hatchlings into their natal pond.
 We used a Bayesian capture-mark-recapture approach to follow their
 survival over two growing seasons. We found a 2% depression of biweekly
 survival in individuals incubated under the cooler temperature, providing
 subtle support to SM. Incubation treatments did not influence growth.
 Large-scale field experiments such as this one will be necessary for
 understanding TSD evolution, and we underline general principles to
 execute such experiments successfully.
description: Painted turtle eggs were collected from Algonquin Provincial Park
 and incubated under two temperature regimes. The following year,
 individuals were released into their natal pond with unique identifiers
 painted on their back. Researchers returned every two weeks to the pond
 and sampled for individuals following a capture-mark-recapture
 methodology.
description: # Data from: The thermal sensitivity of growth and survival in a wild
 reptile with temperature-dependent sex determination Data is from a
 mark-recapture study of painted turtle hatchlings in their natal pond.
 Eggs were collected in 2021 and incubated under two different temperature
 regimes. Hatchlings were kept in the laboratory overwinter and then
 released the following spring (2022). Researchers conducted sampling every
 two weeks (sampling occasion) for two days each time (sampling day). On
 capture, individuals had their midline carapace length and carapace height
 measured, then were immediately released. The raw capture data is
 contained in "IndividualCaptures.csv". This contains one record
 per individual captured per sampling day. The date of the sampling day
 (Date), the sampling occasion (Occasion), sampling day (Day), individual
 ID (ID), midline carapace length in mm (CL), and carapace height in mm
 (CH) are noted for each record. Missing data code: NA Individual metadata
 is contained in "HatchlingData.csv". This contains one row per
 individual and includes the individual ID (ID), the temperature treatment
 they were incubated under (Treatment: HIGH/LOW), the maternal turtle ID
 (MaternalID), egg mass measured within 24hours of laying (Egg Mass),
 carapace length on hatching in cm (CL), mass on hatchling in grams (Mass),
 the day individuals were released on (Release Day: 1/2), and the site they
 were released at (Release Site: 1/2). Code for replicating the analysis
 and creating the figures is contained in "Rscript.R"