Behavior of juvenile green turtles in a coastal neritic habitat: Validating time–depth–temperature records using visual observations

Francke, Devon L.; Hargrove, Stacy K.; Vetter, Eric W.; Winn, Christopher D.; Balazs, George H.; Hyrenbach, K. David

doi:10.1016/j.jembe.2013.03.011

Cited by 7 publications

(5 citation statements)

References 47 publications

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“…This finding supports the hypothesis that turtles in closer proximity to the accumulated Pb shot near the old shooting range are exposed to elevated Pb, either because the Pb from shot may transport into this region's habitat via currents or because these turtles may graze on algae in the area impacted by the shooting range. This difference in Pb concentrations between capture locations corroborates the finding that green turtles have high site fidelity to this region, as noted in Francke et al (2013). In addition, eight of the 10 turtles captured twice were captured in the same sampling region (A or B).…”

Section: Resultssupporting

confidence: 89%

“…The green turtles studied since 2000 along the shoreline of the Kaimalino neighborhood at the mouth of the Kawainui Marsh are highly resident. Between 40 and 100 juvenile turtles reside in the estuary of the Kawainui canal year‐round, exhibiting strong site fidelity to the area (Asuncion, 2010; Francke et al, 2013; Jorgensen & Willems, 1987). Approximately 75% of turtles were recaptured during sampling events spanning 3 years, 2011–2013.…”

Section: Introductionmentioning

confidence: 99%

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Green Sea Turtles (Chelonia mydas) Accumulate Heavy Metals Near a Former Skeet Shooting Range in Kailua, O'ahu, Hawai'i

Shaw

Balazs²,

Jones

et al. 2023

Enviro Toxic and Chemistry

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The present study determined if green sea turtles (Chelonia mydas) in Kailua Bay, Oahu, in the Hawaiian Islands have elevated blood and scute lead (Pb), arsenic (As), and antimony (Sb) concentrations resulting from lead deposition at a historic skeet shooting range. Blood and scute samples were collected and analyzed for Pb, As, and Sb via inductively coupled plasma‐mass spectrometry. Prey, water, and sediment samples were also analyzed. Turtle samples in Kailua Bay (45) have blood Pb concentrations (328 ± 195 ng/g) greater than a reference population (Howick Group of Islands, 29.2 ± 17.1 ng/g). Compared with other green turtle populations, only turtles in Oman, Brazil, and San Diego, CA have blood Pb concentrations greater than turtles in Kailua Bay. The estimated daily exposure of Pb from algae sources in Kailua Bay (0.12 mg/kg/day) was significantly lower than the no observed adverse effect level (100 mg/kg) of red‐eared slider turtles. However, the chronic effects of Pb on sea turtles is poorly understood and continued monitoring of this population will increase our understanding of the Pb and As loads of sea turtles in Kailua Bay. Environ Toxicol Chem 2023;42:1109–1123. © 2023 SETAC. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Green Sea Turtles (Chelonia mydas) Accumulate Heavy Metals Near a Former Skeet Shooting Range in Kailua, O'ahu, Hawai'i

Shaw

Balazs²,

Jones

et al. 2023

Enviro Toxic and Chemistry

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“…For example, loggerheads spend a higher proportion of their time at the surface than olive ridleys 33 and diving behavior of these species can be dependent on ecosystem type and behavioral state (i.e., as turtles forage, rest, or breed) 34 . Furthermore, mean dive time and surface interval can vary between males and females 35 .…”

Section: Discussionmentioning

confidence: 99%

Quantifying Nearshore Sea Turtle Densities: Applications of Unmanned Aerial Systems for Population Assessments

Sykora-Bodie

Bézy

Johnston

et al. 2017

Sci Rep

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Although sea turtles face significant pressure from human activities, some populations are recovering due to conservation programs, bans on the trade of turtle products, and reductions in bycatch. While these trends are encouraging, the status of many populations remains unknown and scientific monitoring is needed to inform conservation and management decisions. To address these gaps, this study presents methods for using unmanned aerial systems (UAS) to conduct population assessments. Using a fixed-wing UAS and a modified strip-transect method, we conducted aerial surveys along a three-kilometer track line at Ostional, Costa Rica during a mass-nesting event of olive ridley turtles (Lepidochelys olivacea). We visually assessed images collected during six transects for sea turtle presence, resulting in 682 certain detections. A cumulative total of 1091 certain and probable turtles were detected in the collected imagery. Using these data, we calculate estimates of sea turtle density (km−2) in nearshore waters. After adjusting for both availability and perception biases, we developed a low-end estimate of 1299 ± 458 and a high-end estimate of 2086 ± 803 turtles km−2. This pilot study illustrates how UAS can be used to conduct robust, safe, and cost-effective population assessments of sea turtle populations in coastal marine ecosystems.

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“…Recent studies using TDRs in conjunction with video observations have shown that resting and foraging can occur at multiple depths , and that the maximum depth of dives did not necessarily correspond with seafloor depth (Thomson et al 2011). Additionally, while Francke et al (2013) found behaviors such as foraging, hovering, and breathing could be determined by specific TDR parameters, other behaviors such as swimming and resting could not. From these studies, it is clear that a thorough understanding of turtle behavior during dives is dependent on the ability to obtain more fine-scale movement data.…”

Section: Introductionmentioning

confidence: 99%

“…While the ecology, movements and diving behavior of juvenile green turtles Chelonia mydas have been reasonably well studied (e.g. Makowski et al 2006, Blumenthal et al 2010, Thomson et al 2011, Francke et al 2013; reviewed in Godley et al 2008, Hochscheid 2014), a critical knowledge gap regarding ontogenetic shifts in habitat use patterns for juveniles is currently hindering effective conservation and management strategies (Hazel et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Trading shallow safety for deep sleep: juvenile green turtles select deeper resting sites as they grow

Hart¹,

White²,

Iverson³

et al. 2016

Endang. Species. Res.

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To better protect endangered green sea turtles Chelonia mydas, a more thorough understanding of the behaviors of each life stage is needed. Although dive profile analyses obtained using time-depth loggers have provided some insights into habitat use, recent work has shown that more fine-scale monitoring of body movements is needed to elucidate physical activity patterns. We monitored 11 juvenile green sea turtles with tri-axial acceleration data loggers in their foraging grounds in Dry Tortugas National Park, Florida, USA, for periods ranging from 43 to 118 h (mean ± SD: 72.8 ± 27.3 h). Approximately half of the individuals (n = 5) remained in shallow (overall mean depth < 2 m) water throughout the experiment, whereas the remaining individuals (n = 6) made excursions to deeper (4 to 27 m) waters, often at night. Despite these differences in depth use, acceleration data revealed a consistent pattern of diurnal activity and nocturnal resting in most individuals. Nocturnal depth differences thus do not appear to represent differences in behavior, but rather different strategies to achieve the same behavior: rest. We calculated overall dynamic body acceleration (ODBA) to assess the relative energetic cost of each behavioral strategy in an attempt to explain the differences between them. Animals in deeper water experienced longer resting dives, more time resting per hour, and lower mean hourly ODBA. These results suggest that resting in deeper water provides energetic benefits that outweigh the costs of transiting to deep water and a potential increased risk of predation.

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Behavior of juvenile green turtles in a coastal neritic habitat: Validating time–depth–temperature records using visual observations

Cited by 7 publications

References 47 publications

Green Sea Turtles (Chelonia mydas) Accumulate Heavy Metals Near a Former Skeet Shooting Range in Kailua, O'ahu, Hawai'i

Green Sea Turtles (Chelonia mydas) Accumulate Heavy Metals Near a Former Skeet Shooting Range in Kailua, O'ahu, Hawai'i

Quantifying Nearshore Sea Turtle Densities: Applications of Unmanned Aerial Systems for Population Assessments

Trading shallow safety for deep sleep: juvenile green turtles select deeper resting sites as they grow

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