The effect of skin reflectance on thermal traits in a small heliothermic ectotherm

Matthews, Genevieve; Goulet, Céline; Delhey, Kaspar; Chapple, David G.

doi:10.1016/j.jtherbio.2016.06.013

Cited by 11 publications

(7 citation statements)

References 51 publications

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“…Consistent individual differences in metabolic rate at a given temperature were also present and stable across all temperatures. This result demonstrates that MR is repeatable within the operable range of temperatures in L. delicata (Matthews et al 2016). Overall, our estimates for the repeatability of MR ranged from 0.09-0.22.…”

Section: Developmental Temperatures and Repeatable Thermal Reaction N...mentioning

confidence: 52%

Impact of developmental temperatures on thermal plasticity and repeatability of metabolic rate

2022

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Phenotypic plasticity is an important mechanism that allows populations to adjust to changing environments. Early life experiences can have lasting impacts on how individuals respond to environmental variation later in life (i.e., individual reaction norms), altering the capacity for populations to respond to selection. Here, we incubated lizard embryos (Lampropholis delicata) at two fluctuating developmental temperatures (cold = 23 ºC + / − 3 ºC, hot = 29 ºC + / − 3 ºC, ncold = 26, nhot = 25) to understand how it affected metabolic plasticity to temperature later in life. We repeatedly measured individual reaction norms across six temperatures 10 times over ~ 3.5 months (nobs = 3,818) to estimate the repeatability of average metabolic rate (intercept) and thermal plasticity (slope). The intercept and the slope of the population-level reaction norm was not affected by developmental temperature. Repeatability of average metabolic rate was, on average, 10% lower in hot incubated lizards but stable across all temperatures. The slope of the thermal reaction norm was overall moderately repeatable (R = 0.44, 95% CI = 0.035 – 0.93) suggesting that individual metabolic rate changed consistently with short-term changes in temperature, although credible intervals were quite broad. Importantly, reaction norm repeatability did not depend on early developmental temperature. Identifying factors affecting among-individual variation in thermal plasticity will be increasingly more important for terrestrial ectotherms living in changing climate. Our work implies that thermal metabolic plasticity is robust to early developmental temperatures and has the capacity to evolve, despite there being less consistent variation in metabolic rate under hot environments.

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Section: Developmental Temperatures and Repeatable Thermal Reaction N...mentioning

confidence: 52%

Impact of developmental temperatures on thermal plasticity and repeatability of metabolic rate

2022

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“…However, assuming a proportion of among‐individual differences is the result of heritable variation our findings suggests that metabolic thermal plasticity may be capable of evolutionary change allowing shifts in population‐level metabolic reaction norms (Ghalambor et al 2007). Average metabolic rate was also repeatable and stable across temperatures and suggests that the operable range of temperature in L. delicata promotes consistency in physiological traits (Matthews et al 2016, Goulet et al 2017). Measurement error declined with increasing temperature presumably because individuals were respiring at a higher rate making it easier to detect changes in CO 2 production.…”

Section: Discussionmentioning

confidence: 99%

Individual variation in thermal plasticity and its impact on mass‐scaling

Kar

Nakagawa

Friesen

et al. 2021

Oikos

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Physiological processes vary widely across individuals and can influence how individuals respond to environmental change. Repeatability in how metabolic rate changes across temperatures (i.e. metabolic thermal plasticity) can influence mass‐scaling exponents in different thermal environments. Moreover, repeatable plastic responses are necessary for reaction norms to respond to selective forces which is important for populations living in fluctuating environments. Nonetheless, only a small number of studies have explicitly quantified repeatability in metabolic plasticity, and fewer have explored how it can impact mass‐scaling. We repeatedly measured standard metabolic rate of n = 42 delicate skinks Lampropholis delicata at six temperatures over the course of four months (N[observations] = 4952). Using hierarchical statistical techniques, we accounted for multi‐level variation and measurement error in our data in order to obtain more precise estimates of reaction norm repeatability and mass‐scaling exponents at different acute temperatures. Our results show that individual differences in metabolic thermal plasticity were somewhat consistent over time (Rslope = 0.25, 95% CI = 2.48 × 10−8 – 0.67), however estimates were associated with a large degree of error. After accounting for measurement error, which decreased steadily with temperature, we show that among individual variance remained consistent across all temperatures. Congruently, temperature specific repeatability of average metabolic rate was stable across temperatures. Cross‐temperature correlations were positive but were not uniform across the reaction norm. After taking into account multiple sources of variation, our estimates for mass‐scaling did not change with temperature and were in line with published values for snakes and lizards. This implies that repeatable plastic responses may promote thermal stability of scaling exponents. Our work contributes to understanding how energy expenditure scales with abiotic and biotic factors and the capacity for reaction norms to respond to selection.

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“…Here we studied the thermal biology of two sympatric Lacertid species (L. diplochondrodes and P. parva) in Phrygian Valley, Turkey. As expected for heliothermic lizards that depend on basking for thermoregulation; air temperature (Ta), substrate temperature (Ts), seasonality (months) and solar radiation were the most effective parameters on both body temperature and temperature excess (Clusella-Trullas et al, 2008;Garrick, 2008;Matthews et al, 2016). On the other hand, body size was not a statistically significant factor in Tb and Tex by itself.…”

Section: Discussionmentioning

confidence: 68%

“…In addition to abiotic factors in the environment morphological and physical characteristics can also influence the thermal biology of ectotherms, such as coloration and body size (Clusella-Trullas and Chown, 2014;Sagonas et al, 2013a;Tanaka, 2005). For instance, darker or melanic coloration might increase the amount of solar radiation absorbed by integument, providing potential advantage to darker colored ectotherms in colder environments (Castella et al, 2013;Clusella-Trullas et al, 2008;Matthews et al, 2016;Stuart-fox et al, 2017). Another important factor on heat exchange is body size, case studies on ectotherm species have shown that generally there is a negative correlation between body size and heat exchange rate (Belliure and Carrascal, 2002;Herczeg et al, 2007;Lactin and Johnson, 1997;Rutschmann et al, 2020), i.e larger individuals heat up more slowly compared to smaller ones by absorbing solar radiation and conduction with hot substrates (Belliure and Carrascal 2002), however this might also lead to losing heat in a slower rate in colder environments (Garrick, 2008).…”

Section: Introductionmentioning

confidence: 99%

Thermal biology of two sympatric Lacertid lizards (Lacerta diplochondrodes and Parvilacerta parva) from Western Anatolia

Şahin

Kuyucu

2021

Journal of Thermal Biology

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The effect of skin reflectance on thermal traits in a small heliothermic ectotherm

Cited by 11 publications

References 51 publications

Impact of developmental temperatures on thermal plasticity and repeatability of metabolic rate

Impact of developmental temperatures on thermal plasticity and repeatability of metabolic rate

Individual variation in thermal plasticity and its impact on mass‐scaling

Thermal biology of two sympatric Lacertid lizards (Lacerta diplochondrodes and Parvilacerta parva) from Western Anatolia

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