Do fluctuations in incubation temperature affect hatchling quality in the Chinese soft-shelled turtle Pelodiscus sinensis?

Li, Hong; Zhou, Zhongze; Wu, Ting; Wu, Yanqing; Ji, Xiang

doi:10.1016/j.aquaculture.2013.05.011

Cited by 22 publications

(22 citation statements)

References 37 publications

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“…Additionally, diel changes in temperature can affect the flow of water into and out of the egg, another potential influence on hatchling fitness (Ackerman & Lott, ). The effects of thermal variance on phenotypic traits of the hatchling vary considerably among species (e.g., Ji, Gao, & Han, ; Li, Zhou, Ding, & Ji, ,b; Lin, Li, An, & Ji, ) and thermal variance may constitute a significant nest‐site selection criterion for female reptiles (Shine & Harlow, ; Warner & Shine, ).…”

Section: Introductionmentioning

confidence: 99%

How frequent and important is behavioral thermoregulation by embryonic reptiles?

Shine

2018

J Exp Zool Pt A

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The debate about behavioral thermoregulation inside reptile eggs centers on the frequency (and hence, biological significance) of the phenomenon, not about its validity. Both sides of the debate agree that large eggs in shallow nests laid in sun-exposed soil will experience clines in mean temperature and (especially) diel thermal variance; that embryos in the middle phase of development have the ability to reposition themselves, and room to do so; and that small changes in developmental temperatures can influence offspring fitness. Equally, all protagonists agree that thermal clines will be too low in some other kinds of nests, and that embryonic repositioning is impossible very early and very late in development. Based on an array of other fitness-enhancing behaviors exhibited by tetrapod embryos, and general principles for recognizing adaptation, we conclude that behavioral thermoregulation inside the egg likely is adaptive in some but not all reptile species. We identify productive directions for empirical research to resolve points of contention.

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Section: Introductionmentioning

confidence: 99%

How frequent and important is behavioral thermoregulation by embryonic reptiles?

Shine

2018

J Exp Zool Pt A

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“…Ji et al. incubated the Chinese soft‐shelled turtle under fluctuating temperatures with different magnitudes of fluctuation (30 ± 3°C and 30 ± 5°C) (Li, Zhou, Wu, Wu, & Ji, ). For the turtles at 30 ± 5°C, the incubation period was longer, the hatching success was lower, and hatchling size was smaller, but the swimming speed was not affected.…”

Section: Discussionmentioning

confidence: 99%

Comparative transcriptional profiling analysis of the effect of heat waves during embryo incubation on the hatchlings of the Chinese soft‐shelled turtle (Pelodiscus sinensis)

Dang

et al. 2018

Ecology and Evolution

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Temperature is one of most the important environmental factors that affect the ontogenesis of organisms. In this study, we incubated Chinese soft‐shelled turtle eggs at 28°C (control temperature, C treatment), a temperature with a 16°C cold shock and a 36°C heat shock twice per week (S treatment) or a ramp‐programmed temperature of 29 ± 9°C (with 12 hr (+) and 12 hr (−) every day) (F treatment). The incubation period, hatching success, hatchling weight, and locomotor performance were significantly different between the controls and the different heat treatment groups. The pathogen challenge results illustrated that hatchlings from the S treatment group were more resistant to bacterial infection, whereas hatchlings from the F treatment group were more vulnerable. We used RNA‐seq quantification analysis to identify differentially expressed genes (DEGs) of hatchlings in the S treatment group. Based on the functional annotation results for the DEGs, 9 genes were chosen to verify the RNA‐seq results. The background expression of DEGs was also analyzed for the three treatments, as was the regulation of the pathogen challenge. The results showed that 8 DEGs were related to the immune response after pathogen challenge and that temperature was an important factor in differential regulation of the immunity pathways.

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“…Importantly, embryos are exposed to a broad range of daily and seasonal temperature fluctuations that represent an ecologically and physiologically relevant challenge faced during development. In comparison to artificial constant temperature incubations, the experience of incubation temperature fluctuations have notably different effects on offspring phenotypes (Schwarzkopf and Brooks, 1985;Shine and Harlow, 1996;Demuth, 2001;Webb et al, 2001;Ashmore and Janzen, 2003;Du and Ji, 2006;Les et al, 2007;Du and Feng, 2008;Lin et al, 2008;Patterson and Blouin-Demers, 2008;Du et al, 2009;Paitz et al, 2010b;Li et al, 2013;Horne et al, 2014). In terms of oxidative stress, daily exposure to higher temperatures during even small fluctuations may be sufficient to cause a shift in an embryo's redox status (Booth and Astill, 2001).…”

Section: Introductionmentioning

confidence: 99%

Temperature experienced during incubation affects antioxidant capacity but not oxidative damage in hatchling red-eared slider turtles (Trachemys scripta elegans)

Treidel

Carter

Bowden

2015

Journal of Experimental Biology

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Our understanding of how oxidative stress resistance phenotypes are affected by the developmental environment is limited. One component of the developmental environment, which is likely central to early life oxidative stress among ectothermic and oviparous species, is that of temperature. We investigated how incubation temperature manipulations affect oxidative damage and total antioxidant capacity (TAC) in red-eared slider turtle (Trachemys scripta elegans) hatchlings. First, to determine whether temperature fluctuations elicit oxidative stress, eggs from clutches were randomly assigned to either a constant (29.5°C) or daily fluctuating temperature incubation (28.7±3°C) treatment. Second, to assess the effect of temperature fluctuation frequency on oxidative stress, eggs were incubated in one of three fluctuating incubation regimes: 28.7±3°C fluctuations every 12 h (hyper), 24 h (normal) or 48 h (hypo). Third, we tested the influence of average incubation temperature by incubating eggs in a daily fluctuating incubation temperature regime with a mean temperature of 26.5°C (low), 27.1°C (medium) or 27.7°C (high). Although the accumulation of oxidative damage in hatchlings was unaffected by any thermal manipulation, TAC was affected by both temperature fluctuation frequency and average incubation temperature. Individuals incubated with a low frequency of temperature fluctuations had reduced TAC, while incubation at a lower average temperature was associated with enhanced TAC. These results indicate that although sufficient to prevent oxidative damage, TAC is influenced by developmental thermal environments, potentially because of temperature-mediated changes in metabolic rate. The observed differences in TAC may have important future consequences for hatchling fitness and overwinter survival.

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Do fluctuations in incubation temperature affect hatchling quality in the Chinese soft-shelled turtle Pelodiscus sinensis?

Cited by 22 publications

References 37 publications

How frequent and important is behavioral thermoregulation by embryonic reptiles?

How frequent and important is behavioral thermoregulation by embryonic reptiles?

Comparative transcriptional profiling analysis of the effect of heat waves during embryo incubation on the hatchlings of the Chinese soft‐shelled turtle (Pelodiscus sinensis)

Temperature experienced during incubation affects antioxidant capacity but not oxidative damage in hatchling red-eared slider turtles (Trachemys scripta elegans)

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