Parental thermal environment alters offspring sex ratio and fitness in an oviparous lizard

Schwanz, Lisa E.

doi:10.1242/jeb.139972

Cited by 25 publications

(43 citation statements)

References 83 publications

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“…Parental effects (e.g. oviposition‐site choice) may be important in mediating the effects of incubation environment (Deeming, ), as nest site selection by females has a significant impact on offspring phenotype (Schwanz, ). Maternal nest site choice could compensate, at least partially, for increased temperatures, such as those predicted by climate change (Doody et al., ; Telemeco, Elphick, & Shine, ).…”

Section: Discussionmentioning

confidence: 99%

Modelled incubation conditions indicate wider potential distributions based on thermal requirements for an oviparous lizard

Stenhouse

Carter

Chapple

et al. 2018

Journal of Biogeography

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Aim Predicting the distribution of species relies increasingly on understanding the spatially explicit constraints of environmental conditions on an organism's physiological traits. We combined an empirical model of temperature‐dependent embryonic development with a mechanistic model of soil temperatures to examine potential thermal limitations on the distribution of a nocturnal, oviparous skink, Oligosoma suteri, a range‐restricted endemic. Location New Zealand. Methods We estimated a thermal requirement for successful embryonic development as 616 degree‐days above a threshold of 13.8°C. We then modelled soil temperatures at representative sites across New Zealand and predicted duration of incubation to map the distribution of potentially viable oviposition sites, given variation in the timing of egg‐laying under even temperature increases. Results Successful development of O. suteri embryos is possible in locations outside their current distribution. Increasing temperatures increased the species’ potential range, reducing incubation duration and lengthening the oviposition window. However, due to the disconnected nature of their rocky shore habitat, individuals may not be able to disperse to currently uninhabited sites within that extended range. Additionally, although locations may be thermally suitable for incubation, predation by introduced mammals, competition and habitat modification may prevent successful establishment of populations. Main conclusions Our models contribute to understanding fundamental physiological constraints on an important life history stage that will inform conservation management actions, including potential future translocations.

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Section: Discussionmentioning

confidence: 99%

Modelled incubation conditions indicate wider potential distributions based on thermal requirements for an oviparous lizard

Stenhouse

Carter

Chapple

et al. 2018

Journal of Biogeography

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“…Specifically, we examined transgenerational and developmental plasticity by asking whether parental and offspring thermal environments impact thermal preferences and limits. Our thermal treatments have been shown to lead to differences in the duration of time spent basking each day and the mean body temperature during the day (Schwanz, ).…”

Section: Discussionmentioning

confidence: 99%

“…To examine the importance of parental effects versus offspring environment on thermal traits, PC1, PC2, and T pant were used as response variables in separate linear mixed effects models with parental treatment, offspring treatment, their interaction, and mass as predictors. Previous findings by Schwanz () indicated a relationship between parental treatment and growth of offspring, suggesting that parental effects on thermal traits could be driven by body size effects. Thus, we considered models with and without mass as a predictor variable.…”

Section: Methodsmentioning

confidence: 95%

“…However, in a previous study using the same thermal treatments, adults basked for essentially the entire time the basking light was on, with body temperature above 30°C for 95% (LB) and 108% (SB) of records during basking light availability. Accordingly, over the course of the day (7:00 a.m.–7:00 p.m.), LB animals had higher mean body temperatures (33.4°C vs. 31.4°C for SB animals; Schwanz, ).…”

Section: Methodsmentioning

confidence: 96%

“…In our study, animals were housed in either short or long basking environments. In previous studies manipulating basking environment, jacky dragons basked nearly all the time when the opportunity was afforded to them, such that longer access to basking opportunities led to greater mean body temperature across the day (Halstead & Schwanz ; Schwanz, ). Thus, we predicted that long basking environments (warmer body temperatures) in parents or offspring would lead to hotter thermal preferences and limits compared to short basking environments.…”

Section: Introductionmentioning

confidence: 99%

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Thermal plasticity due to parental and early‐life environments in the jacky dragon (Amphibolurus muricatus)

Schwanz

2018

J Exp Zool Pt A

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Developmental plasticity creates marked variation in individual phenotypes when the environment is patchy, such as when the thermal environment varies. Plasticity may occur in response to the environment experienced during an individual's lifetime or to the environment experienced by parents (transgenerational plasticity), and may be adaptive if it enhances fitness. In particular, plasticity in thermal traits, such as preferred temperatures and thermal limits, may improve performance and fitness based on temperatures in the local environment. This study examined the influence of parental and offspring thermal environments (duration of access to a basking lamp) on offspring thermal traits (preferred temperatures and panting threshold) in jacky dragons (Agamidae: Amphibolurus muricatus). Long-bask parental environments led, indirectly, to higher preferred temperatures of offspring due to increased offspring body mass compared to offspring of short-bask parents. The increase in median temperature preference was associated with a higher voluntary minimum body temperature and a narrower preference range, suggesting tradeoffs in thermal behavior and a matching of offspring preferences to the parental environment. Parental thermal treatment did not influence offspring panting threshold. Instead, the panting threshold tended to be higher in offspring that were reared in the long-bask treatment compared to those in the short-bask treatment, suggesting longer basking environments increased thermal tolerance. Parental and offspring thermal environment did not exhibit any interactive effect on thermal traits. The results indicate that thermal environments experienced by lizards can have both transgenerational and within-generation impacts on thermal traits, thus influencing how populations respond to fluctuating or changing climates.

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Developmental plasticity in reptiles: Insights into thermal and maternal effects on chameleon phenotypes

Andrews

2018

J Exp Zool Pt A

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Embryonic environments affect a range of phenotypic traits including sex and reproductive success. I determined (1) how the interaction between incubation temperature and egg size affects sex allocation of Chamaeleo calyptratus and (2) how incubation temperature and maternal parent (clutch) affect water uptake by eggs and body size, growth, and climbing speed of hatchlings and juveniles. Eggs from five clutches were exposed to five temperature treatments with clutches replicated within and among treatments. Temperature affected sex, but only when egg size was included as a factor in analyses. At intermediate (28°C) temperatures, daughters were more likely to be produced from large eggs and sons more likely to be produced from small eggs, while at 25 and 30°C, the pattern of sex allocation was reversed. Temperature and clutch affected water uptake and body size. Nonetheless, the direction of temperature and clutch effects on water uptake by eggs and on the size of hatchlings were not the same and the direction of temperature effects on body sizes of hatchlings and juveniles differed as well. Clutch affected hatchling size but not juvenile size and growth rate. Clutch, but not incubation temperature, affected climbing speed, but the fastest hatchlings were not from the same clutches as the fastest juveniles. The independent effects of incubation temperature and clutch indicate that hatchling phenotypes are influenced largely by conditions experienced during incubation, while juvenile phenotypes are influenced largely by conditions experienced in the rearing environment.

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Parental thermal environment alters offspring sex ratio and fitness in an oviparous lizard

Cited by 25 publications

References 83 publications

Modelled incubation conditions indicate wider potential distributions based on thermal requirements for an oviparous lizard

Modelled incubation conditions indicate wider potential distributions based on thermal requirements for an oviparous lizard

Thermal plasticity due to parental and early‐life environments in the jacky dragon (Amphibolurus muricatus)

Developmental plasticity in reptiles: Insights into thermal and maternal effects on chameleon phenotypes

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