Fuel use and corticosterone dynamics in hatchling green sea turtles (Chelonia mydas) during natal dispersal

Hamann, Mark; Jessop, Tim S.; Schauble, Chloe

doi:10.1016/j.jembe.2007.08.017

Cited by 40 publications

(49 citation statements)

References 34 publications

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“…effort, and is consistent with the suggestion that anaerobic effort during digging is also lower than anaerobic swimming effort as reflected by lower blood lactate concentrations in digging compared with swimming hatchling green turtles (Hamann et al, 2007). Clusella Trullas et al (2006) also found that digging had a lower metabolic requirement than swimming.…”

Section: 4supporting

confidence: 85%

“…These spikes were separated by periods of decreased oxygen consumption. During periods of active digging, lactic acid accumulates in hatchling sea turtles (Dial, 1987;Hamann et al, 2007) and causes the hatchlings to stop digging once it reaches an upper threshold (Edwards and Gleeson, 2001). Oxygen consumption would probably remain high for a period after digging in order to pay back an oxygen debt, a period of time when lactate is converted back into pyruvate and pyruvate enters gluconeogenesis (Randall et al, 1997).…”

Section: Metabolic Rate and Hatchling Activitymentioning

confidence: 99%

“…Bustard (1972) suggested that hatchlings may actively dig upwards through the nest column at any time during the day or night. Recent studies (Baldwin et al, 1989;Dial, 1987;Hamann et al, 2007) have used hatchlings' blood lactate concentration as an index of digging intensity, but were unable to relate these values to the overall energetics of the nest escape process. Another study addressed the energetics of nest escape in olive ridley (Lepidochelys olivcaea) hatchlings using the doubly labelled water (DLW) technique (Clusella Trullas et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Synchronous activity lowers the energetic cost of nest escape for sea turtle hatchlings

Rusli

Booth

Joseph

2016

Journal of Experimental Biology

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A potential advantage of group movement in animals is increased locomotion efficiency. This implies a reduced energetic cost for individuals that occur in larger groups such as herds, flocks and schools. When chelonian hatchlings hatch in the underground nest with finite energy for their post-hatching dispersal phase, they face the challenge of minimizing energetic expenditure while escaping the nest. The term 'social facilitation' has been used to describe the combined digging effort of sea turtle hatchlings during nest escape. Given that in a normal clutch, a substantial part of the energy reserve within the residual yolk is used by hatchlings in the digging out process, a decreased cohort size may reduce the energy reserve available to cross the beach and sustain the initial swimming frenzy. This hypothesis was experimentally tested by varying cohort size in hatchling green turtles (Chelonia mydas) and measuring energy expenditure during the nest escape process using open-flow respirometry. The energetic cost of escaping through 40 cm of sand was calculated to vary between 4.4 and 28.3 kJ per individual, the cost decreasing as the number of individuals in the cohort increased. This represents 11-68% of the energy contained in a hatchling's residual yolk at hatching. The reduced energetic cost associated with large cohorts resulted from both a lower metabolic rate per individual and a shortened nest escape time. We conclude that synchronous digging activity of many hatchlings during nest escape evolved not only to facilitate rapid nest emergence but also to reduce the energetic cost to individuals.

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Section: 4supporting

confidence: 85%

Section: Metabolic Rate and Hatchling Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synchronous activity lowers the energetic cost of nest escape for sea turtle hatchlings

Rusli

Booth

Joseph

2016

Journal of Experimental Biology

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“…CORT directs significant changes in aspects of rattlesnake ecology and follows general trends observed in other animals, we predicted that rattlesnakes implanted with CORT would have decreased testosterone due to previously reported suppressive effects of CORT on reproduction to prioritize immediate survival (Wingfield & Sapolsky 2003, Jones & Bell 2004; increased osmolality due to interaction of CORT with mineralocorticoid receptors (Thurnhorst, Beltz & Johnson, 2007;Gaeggeler et al 2005;Morris et al 2000), increased defensive behavior to prioritize immediate survival, increased movements, home range sizes, and detectability due to mobilized energy stores and CORT stimulating dispersal from the area (Wada 2008;Hamann, Jessop & Schäuble 2007), increased stress responses due to an increased baseline CORT (Dupoué et al 2013;Sykes & Klukowski 2009), and increased Tb relative to controls to facilitate mobilization of energy stores due to increased metabolic rates (Landys et al 2006).…”

Section: Introductionmentioning

confidence: 88%

“…Although CORT was elevated in treatment snakes during period 1, no differences were observed between treatment groups in spatial ecology parameters. We expected greater movement in the treatment group during period 1, because CORT mobilizes energy stores (Busch & Hayward 2009), and is associated with dispersal and migration in many species (Wada 2008;Hamann, Jessop & Schäuble 2007).…”

Section: Spatial Ecologymentioning

confidence: 99%

Stress Ecology of the Pacific Rattlesnakes (Crotalus Oreganus and Crotalus Helleri)

Claunch¹

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Assessment of captive rearing conditions on loggerhead hatchlings: Effect of handling frequency and stocking density

et al. 2021

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Frequently, stranded sea turtles require rehabilitation under controlled conditions.Currently, few publications have described the conditions under which rehabilitation is to take place, particularly with respect to the hatchling life stage. To address this paucity of data, we conducted some experiments to assist rehabilitating facilities assess their handling of hatchlings. While in captivity, hatchlings are routinely handled, for example, for data collection and cleaning. Standardization of handling and housing protocols is necessary to define the most adequate rearing conditions to maintain hatchling welfare. Accordingly, the aim of this study was to assess plasma circulating corticosterone (Cort) concentration and growth, as a biomarker for the stress of hatchling loggerhead sea turtles (Caretta caretta) under controlled conditions. We performed two experiments to analyze handling frequency and stocking density. In both, Cort was measured and correlated with variations in animal weight and length. In handling experiments, Cort exhibited no significant increase when hatchlings were handled once a week, whereas Cort was significantly elevated when hatchlings were handled once every 2 weeks, suggesting that hatchlings have the ability to acclimate to frequent handling. However, hatchlings exhibited similar growth and mortality, regardless of handling regime. In stocking density experiments, hatchling isolation induced a significant elevation of Cort, in comparison with hatchlings placed with conspecifics at increasing densities. Growth increased in singly housed hatchlings, while mortality increased in tanks with three or more hatchlings. The results obtained suggest that Cort, growth, and mortality should be measured to assess hatchling welfare when kept under controlled conditions.

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Fuel use and corticosterone dynamics in hatchling green sea turtles (Chelonia mydas) during natal dispersal

Cited by 40 publications

References 34 publications

Synchronous activity lowers the energetic cost of nest escape for sea turtle hatchlings

Synchronous activity lowers the energetic cost of nest escape for sea turtle hatchlings

Stress Ecology of the Pacific Rattlesnakes (Crotalus Oreganus and Crotalus Helleri)

Assessment of captive rearing conditions on loggerhead hatchlings: Effect of handling frequency and stocking density

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