Metabolic Rates and Thermal Thresholds of Embryonic Flatback Turtles (<i>Natator depressus</i>) from the North West Shelf of Australia

Gammon, Malindi; Bentley, Blair P.; Fossette, Sabrina; Mitchell, Nicola J.

doi:10.1086/716848

Cited by 3 publications

(3 citation statements)

References 53 publications

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“…For these species, we lack hatching success data below lower and above upper lethal temperatures (i.e., ~ 25 and ~35°C, respectively, Howard et al., 2014) to properly estimate thermal tolerance limits from laboratory experiments although see Gammon et al. (2021).…”

Section: Discussionmentioning

confidence: 99%

“…Such data gaps hindered our ability to include leatherback (Dermochelys coriacea) and flatback (Natator depressus) turtles in our assessment. For these species, we lack hatching success data below lower and above upper lethal temperatures (i.e., ~ 25 and ~35°C, respectively, Howard et al, 2014) to properly estimate thermal tolerance limits from laboratory experiments although see Gammon et al (2021).…”

Section: Discussionmentioning

confidence: 99%

“…The long-term consequences of skewed primary and adult sex ratios on population dynamics and the proportion of males required to sustain populations need to be fully understood for more robust assessments of the impacts of climate change on sea turtles (Boyle et al, 2014(Boyle et al, , 2016Heppell et al, 2022). Similarly, for studies that aim to predict future hatchling production, such as this one, lack of data on the relationship between constant temperatures and hatching success remains problematic as well as lack of knowledge of how to integrate varying temperatures into constant equivalent temperatures and a lack of understanding on metabolic heating and its contribution to hatching success (Gammon et al, 2020(Gammon et al, , 2021. Such data gaps hindered our ability to include leatherback (Dermochelys coriacea) and flatback (Natator depressus) turtles in our assessment.…”

Section: Discussionmentioning

confidence: 99%

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Adaptation of sea turtles to climate warming: Will phenological responses be sufficient to counteract changes in reproductive output?

Fuentes,

Santos,

Abreu‐Grobois

et al. 2023

Global Change Biology

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Sea turtles are vulnerable to climate change since their reproductive output is influenced by incubating temperatures, with warmer temperatures causing lower hatching success and increased feminization of embryos. Their ability to cope with projected increases in ambient temperatures will depend on their capacity to adapt to shifts in climatic regimes. Here, we assessed the extent to which phenological shifts could mitigate impacts from increases in ambient temperatures (from 1.5 to 3°C in air temperatures and from 1.4 to 2.3°C in sea surface temperatures by 2100 at our sites) on four species of sea turtles, under a “middle of the road” scenario (SSP2‐4.5). Sand temperatures at sea turtle nesting sites are projected to increase from 0.58 to 4.17°C by 2100 and expected shifts in nesting of 26–43 days earlier will not be sufficient to maintain current incubation temperatures at 7 (29%) of our sites, hatching success rates at 10 (42%) of our sites, with current trends in hatchling sex ratio being able to be maintained at half of the sites. We also calculated the phenological shifts that would be required (both backward for an earlier shift in nesting and forward for a later shift) to keep up with present‐day incubation temperatures, hatching success rates, and sex ratios. The required shifts backward in nesting for incubation temperatures ranged from −20 to −191 days, whereas the required shifts forward ranged from +54 to +180 days. However, for half of the sites, no matter the shift the median incubation temperature will always be warmer than the 75th percentile of current ranges. Given that phenological shifts will not be able to ameliorate predicted changes in temperature, hatching success and sex ratio at most sites, turtles may need to use other adaptive responses and/or there is the need to enhance sea turtle resilience to climate warming.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Adaptation of sea turtles to climate warming: Will phenological responses be sufficient to counteract changes in reproductive output?

Fuentes,

Santos,

Abreu‐Grobois

et al. 2023

Global Change Biology

View full text Add to dashboard Cite

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Reconstructed and projected beach temperatures reveal where flatback turtles are most at risk from climate change

Gammon,

Bentley,

Fossette

et al. 2024

Global Ecology and Conservation

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Nesting habitat characteristics of flatback Natator depressus, green Chelonia mydas and loggerhead Caretta caretta turtles in eastern Queensland, Australia

Heddle,

Peters,

Hamann

et al. 2024

Endang. Species. Res.

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Coastal areas provide essential habitats for marine turtle nesting and hatching, but they are under increasing threat due to climate change and other anthropogenic impacts. Very little is known about the nesting habitat characteristics of flatback Natator depressus, green Chelonia mydas and loggerhead Caretta caretta turtles in eastern Queensland, which limits our ability to evaluate which nesting beaches are at risk due to anthropogenic and environmental disturbances and prioritise conservation and monitoring actions. Here, we used generalised linear models to investigate the relationship between the presence/absence of flatback, green and loggerhead turtle nests and environmental and topographic characteristics of 237 potential nesting sites along the central and southern coasts of Queensland. The presence of nesting flatback turtles was strongly correlated with the mainland and non-coral cay islands with decreasing latitude, as there is an interaction between site type and latitude. In contrast, green turtles preferred to nest on coral cays rather than mainland and island beaches. Loggerhead turtles were more likely to nest on coral cays, the mainland, then islands, with presence increasing with latitude. Among these site types and higher latitudes, presence was stronger on sheltered than on semi-exposed beaches. Identifying environmental and topographical features influencing the presence of nesting flatback, green and loggerhead turtles is an important first step to improve the conservation of these species by prioritising sites for monitoring and managing threats to important beaches.

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Metabolic Rates and Thermal Thresholds of Embryonic Flatback Turtles (Natator depressus) from the North West Shelf of Australia

Cited by 3 publications

References 53 publications

Adaptation of sea turtles to climate warming: Will phenological responses be sufficient to counteract changes in reproductive output?

Adaptation of sea turtles to climate warming: Will phenological responses be sufficient to counteract changes in reproductive output?

Reconstructed and projected beach temperatures reveal where flatback turtles are most at risk from climate change

Nesting habitat characteristics of flatback Natator depressus, green Chelonia mydas and loggerhead Caretta caretta turtles in eastern Queensland, Australia

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