Influence of incubation temperature on sea turtle hatchling quality

Booth, David T.

doi:10.1111/1749-4877.12255

Cited by 94 publications

(97 citation statements)

References 57 publications

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“…For this reason, several studies have focused on temperature fluctuations and their influence on embryonic development in turtles and lizards (Ashmore & Janzen, ; Du & Ji, ; Fuentes, Limpus, & Hamann, ; Georges, Beggs, Young, & Doody, ; Hawkes, Broderick, Godfrey, & Godley, ; Hays, Broderick, Glen, & Godley, ; Les, Paitz, & Bowden, ; Ma et al, ; Mitchell, Kearney, Nelson, & Porter, ; Patiño‐Martinez, Marco, Quiñones, & Hawkes, ; Wapstra et al, ; Witt, Hawkes, Godfrey, Godley, & Broderick, ), although this aspect has not been widely studied in crocodilians. It was also mentioned that incubation temperature influences hatchling phenotypes and quality in reptiles (Booth, , ; Noble, Stenhouse, & Schwanz, ).…”

Section: Discussionmentioning

confidence: 99%

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Influence of temperature variation on incubation period, hatching success, sex ratio, and phenotypes in Caiman latirostris

et al. 2019

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Temperature is crucial for reptiles, also during embryonic development, particularly for species with temperature‐dependent sex determination. Under natural conditions, Broad‐snouted caiman (Caiman latirostris) eggs are influenced by thermal changes in the interior of the nest related to the external environmental temperature. As nests are subject to variations in temperature and most lab studies on crocodilian incubation have been carried out at constant temperatures, we were interested in determining how temperature fluctuations may affect the development of caiman embryos. We investigated the effects of incubation at constant temperatures (31°C, 32°C, and 33°C) and fluctuating temperatures (31 ± 2, 32 ± 1, and 32 ± 2°C) on the following aspects: incubation period duration, hatching success, sex ratio, total length, and body mass of C. latirostris hatchlings. Eggs incubated at 31°C produced 100% females, those at 32°C produced 71.6% females (however, the sex ratio was nest related), and at 33°C produced 100% males. We found a masculinizing effect when incubation was at 31 ± 2°C compared with a constant 31°C; and temperature fluctuations at 32°C (32 ± 1 and 32 ± 2°C) had a negative effect on hatchlings size and mass, and hatching success compared with constant incubation temperatures of 32°C and 33°C. Finally, the effect of temperature variation during the incubation period on sex ratio, hatching success, and phenotype depends on the mean temperature, as the fluctuation around 31°C affected the sex ratios and incubation period, and the fluctuation around 32°C affected hatchling success and size.

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Section: Discussionmentioning

confidence: 99%

“…However, it is well known that nest (incubation) temperature varies considerably during embryogenesis in nature (Simoncini et al, 2014;Valenzuela, 2001 (Booth, 2006(Booth, , 2017Noble, Stenhouse, & Schwanz, 2018).…”

Section: Discussionmentioning

confidence: 99%

Influence of temperature variation on incubation period, hatching success, sex ratio, and phenotypes in Caiman latirostris

et al. 2019

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“…It is important to note that warming temperatures will also have influences on the phenotype and survival of hatchlings (Fisher et al., ; Kobayashi et al., ; Booth, ). For example, as well as the effects we show on embryonic survival, incubation temperatures have also been shown to affect hatchling size (e.g., Booth & Astill, ; Kobayashi et al., ), crawling speed across the beach (e.g., Booth, Feeney, & Shibata, ; Kobayashi et al., ) and swimming speed upon entering the water (e.g., Burgess, Booth, & Lanyon, ; Booth & Evans, ; Kobayashi et al., ).…”

Section: Discussionmentioning

confidence: 99%

Climate change and temperature‐linked hatchling mortality at a globally important sea turtle nesting site

Laloë

Cozens²,

Renom³

et al. 2017

Global Change Biology

100

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The study of temperature-dependent sex determination (TSD) in vertebrates has attracted major scientific interest. Recently, concerns for species with TSD in a warming world have increased because imbalanced sex ratios could potentially threaten population viability. In contrast, relatively little attention has been given to the direct effects of increased temperatures on successful embryonic development. Using 6603 days of sand temperature data recorded across 6 years at a globally important loggerhead sea turtle rookery-the Cape Verde Islands-we show the effects of warming incubation temperatures on the survival of hatchlings in nests. Incorporating published data (n = 110 data points for three species across 12 sites globally), we show the generality of relationships between hatchling mortality and incubation temperature and hence the broad applicability of our findings to sea turtles in general. We use a mechanistic approach supplemented by empirical data to consider the linked effects of warming temperatures on hatchling output and on sex ratios for these species that exhibit TSD. Our results show that higher temperatures increase the natural growth rate of the population as more females are produced. As a result, we project that numbers of nests at this globally important site will increase by approximately 30% by the year 2100. However, as incubation temperatures near lethal levels, the natural growth rate of the population decreases and the long-term survival of this turtle population is threatened. Our results highlight concerns for species with TSD in a warming world and underline the need for research to extend from a focus on temperature-dependent sex determination to a focus on temperature-linked hatchling mortalities.

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“…Irrespective of foraging habitat, female loggerheads laid larger eggs during the warmer period of the nesting season at Yakushima Island. In general, smaller sea turtle hatchlings emerge from clutches incubated under warmer temperatures (e.g., Booth, ). Thus, similar‐sized loggerhead hatchlings were expected to emerge throughout the nesting season, due to larger egg size being offset by warmer temperature.…”

Section: Discussionmentioning

confidence: 99%

Effect of maternal foraging habitat on offspring quality in the loggerhead sea turtle (Caretta caretta)

Hatase

Omuta²,

Itou

et al. 2018

Ecology and Evolution

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Exploring a trade‐off between quantity and quality of offspring allows differences in the fitness between alternative life histories to be accurately evaluated. We addressed the mechanism that maintains alternative life histories (small oceanic planktivores vs. large neritic benthivores) observed in a loggerhead sea turtle (Caretta caretta) population, which has been suggested to be environmental, based on the lack of genetic structure and a large difference in reproductive output. We examined whether maternal foraging habitat affects offspring quality, by measuring the morphology, emergence success, and righting response of hatchlings following incubation in a common open sand area over the whole nesting season at Yakushima Island, Japan, and by recording early growth and survival of offspring that were reared in a common environment at a Japanese aquarium. Furthermore, we tested whether sea turtles adjust egg size in response to temporal shifts of the incubation environment. There were no significant differences in any hatchling traits between oceanic and neritic foragers (which were classified by stable isotope ratios), except for clutches laid during the warmest period of the nesting season. There were also no significant differences in the growth and survival of offspring originating from the two foragers. The size of eggs from both foragers significantly increased as the season progressed, even though the rookery had heavy rainfall, negating the need to counteract heat‐related reduction in hatchling morphology. In comparison, the sizes of adult body and clutches from both foragers did not vary significantly. The results further support our previous suggestions that the size‐related foraging dichotomy exhibited by adult sea turtles does not have a genetic basis, but derives from phenotypic plasticity. Adjustment in reproductive investment may be associated with: (1) predation avoidance, (2) founder effect, and/or (3) annual variation in egg size.

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Influence of incubation temperature on sea turtle hatchling quality

Cited by 94 publications

References 57 publications

Influence of temperature variation on incubation period, hatching success, sex ratio, and phenotypes in Caiman latirostris

Influence of temperature variation on incubation period, hatching success, sex ratio, and phenotypes in Caiman latirostris

Climate change and temperature‐linked hatchling mortality at a globally important sea turtle nesting site

Effect of maternal foraging habitat on offspring quality in the loggerhead sea turtle (Caretta caretta)

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