Microclimatic effects on the incubation success, hatchling morphology and locomotor performance of marine turtles

Staines, Melissa N.; Booth, David T.; Limpus, Colin J.

doi:10.1016/j.actao.2019.04.008

Cited by 26 publications

(15 citation statements)

References 43 publications

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“…To date, the effect size measured appears to be relatively small and variable (e.g. varying between 0.08 and 11.5 s longer to right, Maulany et al 2012, Staines et al 2019; and between 0.5 m s −1 slower and 1.5 m s −1 faster, Sim et al 2015, Rivas et al 2019 and is almost certainly complicated by species differences and rookery to rookery variation in physiological parameters. Other reptiles (e.g.…”

Section: Hatchling Morphology Survival and Performancementioning

confidence: 99%

Climate change and marine turtles: recent advances and future directions

Patrício

Hawkes

Monsinjon

et al. 2021

Endang. Species. Res.

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Climate change is a threat to marine turtles that is expected to affect all of their life stages. To guide future research, we conducted a review of the most recent literature on this topic, highlighting knowledge gains and research gaps since a similar previous review in 2009. Most research has been focussed on the terrestrial life history phase, where expected impacts will range from habitat loss and decreased reproductive success to feminization of populations, but changes in reproductive periodicity, shifts in latitudinal ranges, and changes in foraging success are all expected in the marine life history phase. Models have been proposed to improve estimates of primary sex ratios, while technological advances promise a better understanding of how climate can influence different life stages and habitats. We suggest a number of research priorities for an improved understanding of how climate change may impact marine turtles, including: improved estimates of primary sex ratios, assessments of the implications of female-biased sex ratios and reduced male production, assessments of the variability in upper thermal limits of clutches, models of beach sediment movement under sea level rise, and assessments of impacts on foraging grounds. Lastly, we suggest that it is not yet possible to recommend manipulating aspects of turtle nesting ecology, as the evidence base with which to understand the results of such interventions is not robust enough, but that strategies for mitigation of stressors should be helpful, providing they consider the synergistic effects of climate change and other anthropogenic-induced threats to marine turtles, and focus on increasing resilience.

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Section: Hatchling Morphology Survival and Performancementioning

confidence: 99%

Climate change and marine turtles: recent advances and future directions

Patrício

Hawkes

Monsinjon

et al. 2021

Endang. Species. Res.

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“…There are many environmental factors that influence the variation in sand temperature within and between nesting beaches. These include sand colour, level of shading provided by vegetation, beach orien tation, prevailing wind direction, and rainfall events (Hays et al 2001, Booth & Freeman 2006, Wood et al 2014, Esteban et al 2018, Tilley et al 2019, Staines et al 2019, 2020. Rainfall is an efficient and natural sand coolant causing decreases in nest temperature that can result in an increase in male hatchling production (Houghton et al 2007, Lolavar & Wyneken 2015, Rivas et al 2018, Staines et al 2020, Laloë et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Trialling seawater irrigation to combat the high nest temperature feminisation of green turtle Chelonia mydas hatchlings

Smith¹,

Booth

Crosby

et al. 2021

Mar. Ecol. Prog. Ser.

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Global increases in beach sand temperatures are predicted to skew hatchling sex ratios of marine turtle populations towards female bias. Currently, shade structures and freshwater irrigation are management strategies used to cool nest temperatures, but require resources that are limited at remote rookeries. Here, we report on a novel investigation that used seawater irrigation as a sand-cooling method. Various volumes of seawater were applied to sand to determine the optimal application required to lower sand temperatures at nest depth to produce male-biased sex ratios. We performed these experiments during the 2019-2020 nesting season at Heron Island on the southern Great Barrier Reef, Australia, and at Panasesa Island, Papua New Guinea. We found the amount of cooling at nest depth was site dependent and varied with the seawater irrigation regime used. At Heron Island, we used a one-off application of the equivalent of 120 mm of rainfall either as freshwater or seawater to the sand above incubating clutches 18 d after oviposition to determine whether this affected the hatching success of green turtle Chelonia mydas eggs. Both treatments had higher hatching success (83.8 ± 3.5% and 71.2 ± 6.3%, respectively, means ± SE) compared to control clutches (63.5 ± 6.0%). Our results indicate that a one-off application of seawater may be an effective management option for reducing nest temperatures during the sex-determining period of marine turtle clutches incubating in situ. Seawater irrigation could be used in areas where populations are at highest risk of feminisation caused by a hot drying climate where freshwater is not available for irrigation.

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“…Estudios señalan que la alta mortalidad embrionaria se debe a aumentos en la temperatura del nido en las primeras y últimas etapas del período de incubación (Bladow & Milton, 2019;López-Correa et al, 2010;Read et al, 2013). Staines et al (2019) et al (2004), se observó un efecto positivo de la humedad sobre el éxito de la eclosión. Por otra parte, según Rivas et al (2018), eventos como las lluvias pueden afectar el éxito reproductivo.…”

Section: Discussionunclassified

Effect of nest relocation on the reproductive success of the marine turtle Lepidochelys olivacea (Testudinata: Cheloniidae)

et al. 2021

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Resumen. Introducción: Para incrementar el número de crías de tortugas marinas, es necesario mejorar estrategias de conservación, como incubación de nidos, en condiciones de vivero que contrarresten los efectos de las condiciones climáticas extremas. Objetivo: Comparar cinco parámetros de éxito reproductivo (éxito de eclosión, huevos sin desarrollo, crías muertas, mortalidad embrionaria y período de incubación) de la tortuga marina Lepidochelys olivacea. Métodos: Se evaluó la incubación de nidos bajo dos períodos de relocación de nidos (P1 y P2) bajo condiciones de vivero, en el año 2018 en Guerrero, México. Resultados: Se encontraron diferencias significativas en el éxito de eclosión y la mortalidad embrionaria entre los períodos de reubicación de nidos (P <0.001). En P1, se observaron valores más bajos de éxito de eclosión (77.0 % P1 vs 88.6 % P2) y valores más altos de mortalidad embrionaria (13.7 % P1 vs 3.3 % P2) comparados con los de P2. No se encontraron diferencias entre periodos respecto a los parámetros de huevos sin desarrollo, crías muertas y período de incubación. Conclusiones: las diferencias entre las condiciones ambientales más extremas o calurosas durante el primer período de relocación de nidos parecen afectar el éxito de eclosión y mortalidad embrionaria de L. olivacea. Por lo tanto, es importante tomar medidas al respecto durante esta etapa de incubación.

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Microclimatic effects on the incubation success, hatchling morphology and locomotor performance of marine turtles

Cited by 26 publications

References 43 publications

Climate change and marine turtles: recent advances and future directions

Climate change and marine turtles: recent advances and future directions

Trialling seawater irrigation to combat the high nest temperature feminisation of green turtle Chelonia mydas hatchlings

Effect of nest relocation on the reproductive success of the marine turtle Lepidochelys olivacea (Testudinata: Cheloniidae)

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