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Quantifying the energetic cost of disorientation in loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtle hatchlingsUnknown Date (has links)
The photopollution of beaches caused by artificial light sources can interfere with sea turtle hatchlings' ability to orient properly towards the sea. Exhaustion due to extended disorientation crawling may then increase hatchling mortality. This study evaluated the energetic consequences of long-distance crawls in green and loggerhead sea turtle hatchlings. Turtles crawled for 200 m or 500 m on a treadmill, followed by a 30 minute evaluation of swim performance. Metabolic activity was quantified via measures of blood glucose, blood lactate, and oxygen consumption. No significant changes in metabolism resulted from long-distance crawling activity in loggerheads ; however, loggerheads rested for extended periods of time during the crawl trials, often unresponsive to stimuli. This behavior implies that loggerhead hatchlings would be vulnerable to predation or temperature stress due to exhaustion from extended periods of crawling. Further data is required to draw any significant conclusions about long-term disorientatin crawling in green hatchlings. / by Sean Williams. / Thesis (M.S.)--Florida Atlantic University, 2012. / Includes bibliography. / Mode of access: World Wide Web. / System requirements: Adobe Reader.
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Physiological Effects of Disorientation in Loggerhead (Caretta caretta) and Green (Chelonia mydas) Sea Turtle HatchlingsUnknown Date (has links)
Following nest emergence, sea turtle hatchling dispersal can be disrupted by
artificial light or skyglow from urban areas. Mis- or disorientation increases exposure to
predation, thermal stress, and dehydration, could consume valuable energy, and thus
influence the likelihood of survival. This study utilized laboratory simulations of
extended crawl distances and field observations to investigate the energy cost of
disorientation crawling on loggerhead (Caretta caretta) and green (Chelonia mydas) sea
turtle hatchlings and the impact on the subsequent swim frenzy. Extended crawls
increased oxygen consumption, decreased plasma glucose, and reduced green hatchling
swim performance following a 200m crawl. Surprisingly, plasma lactate concentrations
did not increase with crawl distance, likely due to frequent rest periods that would,
however, increase time on the beach and thus exposure to predators. This research may
provide managers with physiological data to determine best practices for sea turtle
conservation and adds to the biological knowledge of these animals. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection
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