Current Search: Turtles (x)
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Title
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A comparative approach to understanding sea turtle hatchling metabolism during emergence.
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Creator
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Redfearn, Erin Cherish., Florida Atlantic University, Wyneken, Jeanette
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Abstract/Description
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Sea turtle nests were compared to determine the effects of nest depth on hatchling anaerobic metabolism in Juno Beach, Florida, USA. In situ nests of 3 species (Caretta caretta, Chelonia mydas and Dermochelys coriacea) were compared. Relocated loggerhead nests were studied under an experimental regime. Nest temperatures and oxygen concentrations were monitored. On the night of first emergence, blood samples were taken from hatchlings resting at the nest chamber bottom and sand surface, and...
Show moreSea turtle nests were compared to determine the effects of nest depth on hatchling anaerobic metabolism in Juno Beach, Florida, USA. In situ nests of 3 species (Caretta caretta, Chelonia mydas and Dermochelys coriacea) were compared. Relocated loggerhead nests were studied under an experimental regime. Nest temperatures and oxygen concentrations were monitored. On the night of first emergence, blood samples were taken from hatchlings resting at the nest chamber bottom and sand surface, and digging to the sand surface. Samples were analyzed for lactate concentrations. Blood lactate levels were high in hatchlings actively digging and low for those resting. Lactate levels differed among species and nest depths. Within in situ nests, actively digging green turtle hatchlings had the highest lactate, followed by loggerhead hatchlings and leatherbacks (lowest). Loggerhead hatchlings digging from deeper relocated nests had higher lactate than those digging from shallower depths.
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Date Issued
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2000
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PURL
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http://purl.flvc.org/fcla/dt/15770
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Subject Headings
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Sea turtles--Metabolism, Loggerhead turtle, Green turtle, Leatherback turtle
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Format
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Document (PDF)
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Title
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Visual spectral sensitivity of loggerhead (Caretta caretta L.) and leatherback (Dermochelys coriacea L.) hatchlings: A comparative study.
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Creator
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Gocke, Judith P., Florida Atlantic University, Salmon, Michael
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Abstract/Description
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In the ocean, lighting varies with habitat; the eye's spectral sensitivity must vary with visual ecology. Green turtles are the only sea turtle whose spectral sensitivity has been studied. Loggerheads and leatherbacks see visible light between 340 and 700 nm. However, the wavelengths detected with the greatest sensitivity by both species are those best transmitted at the specific depths where food, mates and predators are likely to be encountered. Both species have trichromatic vision, but...
Show moreIn the ocean, lighting varies with habitat; the eye's spectral sensitivity must vary with visual ecology. Green turtles are the only sea turtle whose spectral sensitivity has been studied. Loggerheads and leatherbacks see visible light between 340 and 700 nm. However, the wavelengths detected with the greatest sensitivity by both species are those best transmitted at the specific depths where food, mates and predators are likely to be encountered. Both species have trichromatic vision, but the species differ in the concentration and peak sensitivity of each visual pigment resulting in either a broadly tuned (loggerhead) or finely tuned (leatherback) spectral sensitivity. Spectral sensitivity of leatherbacks overlaps both bioluminescence of prey, and light available in clear, deep, oceanic waters.
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Date Issued
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2003
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PURL
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http://purl.flvc.org/fcla/dt/13029
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Subject Headings
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Loggerhead turtle, Leatherback turtle, Spectral sensitivity
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Format
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Document (PDF)
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Title
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A seasonal and latitudinal assessment of early growth rates in northern and southeastern loggerhead sea turtles (Caretta caretta L.).
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Creator
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Stokes, Lesley., Florida Atlantic University, Wyneken, Jeanette
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Abstract/Description
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To improve our understanding of loggerhead life history, particularly factors affecting the duration of each age class and survivorship, detailed growth data must be interpreted. The purpose of this study was to investigate how temporal and spatial nest origin influence initial hatchling size and growth potential. Seasonal environmental fluctuations and maternal resource allocation could result in differential hatchling size and development. Hatchlings from ten sites from North Carolina to...
Show moreTo improve our understanding of loggerhead life history, particularly factors affecting the duration of each age class and survivorship, detailed growth data must be interpreted. The purpose of this study was to investigate how temporal and spatial nest origin influence initial hatchling size and growth potential. Seasonal environmental fluctuations and maternal resource allocation could result in differential hatchling size and development. Hatchlings from ten sites from North Carolina to Florida representing 2 subpopulations were sampled during 3 phases of the season. The largest (WT, SCL and SCW) hatchlings came from the northernmost site with initial size decreasing as latitude decreased. Turtles deposited during the earliest phase of the nesting season grew faster than those from later phases of the season. Differences in initial size and growth potential could influence early stage survivorship as a function of size-based predation, and may imply the need for separate consideration when constructing population models.
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Date Issued
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2003
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PURL
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http://purl.flvc.org/fcla/dt/13070
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Subject Headings
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Loggerhead turtle--Growth, Sea turtles
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Format
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Document (PDF)
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Title
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The effect of filtered roadway lighting on nesting by loggerhead sea turtles (Caretta caretta L.).
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Creator
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Pennell, Jeffrey P., Florida Atlantic University, Salmon, Michael, Department of Biological Sciences, Charles E. Schmidt College of Science
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Abstract/Description
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The purpose of this study was to determine if filtered street lighting affected the nesting behavior of loggerhead sea turtles ( Caretta caretta L.). My study site was a nesting beach at Carlin Park, Jupiter, Florida. During the 1999 nesting season, portions of the beach were either kept dark or were illuminated by four 70 W high-pressure sodium (HPS) streetlights, each housed in a cut-off fixture covered by an acrylic (model #2422) filter. These filters excluded all light wavelengths below...
Show moreThe purpose of this study was to determine if filtered street lighting affected the nesting behavior of loggerhead sea turtles ( Caretta caretta L.). My study site was a nesting beach at Carlin Park, Jupiter, Florida. During the 1999 nesting season, portions of the beach were either kept dark or were illuminated by four 70 W high-pressure sodium (HPS) streetlights, each housed in a cut-off fixture covered by an acrylic (model #2422) filter. These filters excluded all light wavelengths below 540 nm. The excluded wavelengths repel nesting females. Daily counts of nesting and non-nesting crawls were made. Data from the 1999 nesting season were compared to historical records of nesting at the site between 1990 and 1998. I found no evidence that filtered lights affected nesting densities, or the ratio of successful to unsuccessful crawls. These results suggest that at Carlin Park, the nesting behavior of loggerhead females is unaffected by exposure of the beach to filtered street lighting.
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Date Issued
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2000
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PURL
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http://purl.flvc.org/fcla/dt/12720
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Subject Headings
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Loggerhead turtle, Sea turtles--Nests
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Format
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Document (PDF)
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Title
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The physiological effects of Sargassum beach coverage on three species of sea turtle hatchlings.
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Creator
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Chaney, Abigail, Milton, Sarah L., Florida Atlantic University, Department of Biological Sciences, Charles E. Schmidt College of Science
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Abstract/Description
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Sea turtle hatchlings face a variety of obstacles as they crawl down the beach to the ocean after emergence. One of these obstacles is Sargassum, a floating brown macroalgae, that washes up in large quantities on beaches from Florida to South America. This study examined the physiological response and physical performance of three species of sea turtle hatchlings (D. coriacea, C. caretta, and C. mydas) after crawling over various heights of Sargassum. In all three species, the addition of...
Show moreSea turtle hatchlings face a variety of obstacles as they crawl down the beach to the ocean after emergence. One of these obstacles is Sargassum, a floating brown macroalgae, that washes up in large quantities on beaches from Florida to South America. This study examined the physiological response and physical performance of three species of sea turtle hatchlings (D. coriacea, C. caretta, and C. mydas) after crawling over various heights of Sargassum. In all three species, the addition of Sargassum significantly increased the amount of time it took to crawl down the pathway. There was no significant difference in righting response, blood glucose levels, or plasma corticosterone concentrations between different crawling treatments. During periods of high Sargassum accumulation, hatchlings will spend more time on the beach trying to navigate through the algae, leaving them vulnerable to predation for longer periods of time.
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Date Issued
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2022
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PURL
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http://purl.flvc.org/fau/fd/FA00013939
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Subject Headings
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Sea turtles, Sargassum, Sea turtles--Ecology
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Format
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Document (PDF)
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Title
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Determining the sensitive period for magnetic imprinting in loggerhead turtles.
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Creator
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Pate, Jessica Hope, Salmon, Michael, Franquiz, Auriel, Graduate College
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Date Issued
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2013-04-12
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PURL
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http://purl.flvc.org/fcla/dt/3361335
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Subject Headings
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Loggerhead turtle, Geomagnetism, Imprinting
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Format
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Document (PDF)
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Title
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Does allometric growth in juvenile marine turtles have survival benefits? A morphological test with a gape-limited predator.
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Creator
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Scholl, Joshua, Salmon, Michael
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Date Issued
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2013-04-05
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PURL
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http://purl.flvc.org/fcla/dt/3361191
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Subject Headings
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Allometry, Marine turtles, Predators
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Format
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Document (PDF)
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Title
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How leatherback hatchlings recognize their prey: Sensory predispositions and behavioral responses.
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Creator
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Constantino, Maricela Alcantara., Florida Atlantic University, Salmon, Michael
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Abstract/Description
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Leatherback sea turtles (Dermochelys coriacea) feed exclusively on gelatinous prey. Hatchlings are solitary and must possess a predisposition to respond to prey. In laboratory experiments, I studied the responses of nineteen leatherback hatchlings to visual (jellyfish model and shapes: circle, square, diamond) and chemical (homogenates of three prey) stimuli presented alone or as paired (visual + chemical) treatments once daily. When presented alone visual stimuli resembling jellyfish...
Show moreLeatherback sea turtles (Dermochelys coriacea) feed exclusively on gelatinous prey. Hatchlings are solitary and must possess a predisposition to respond to prey. In laboratory experiments, I studied the responses of nineteen leatherback hatchlings to visual (jellyfish model and shapes: circle, square, diamond) and chemical (homogenates of three prey) stimuli presented alone or as paired (visual + chemical) treatments once daily. When presented alone visual stimuli resembling jellyfish outlines elicited stronger feeding responses (changes in locomotion and orientation) than those not resembling jellyfish. Chemical stimuli alone induced a rheotaxis, but responses evoked by some homogenates were stronger than responses to others. Paired stimuli evoked stronger orientation and more consistent increases in swimming (flipper stroke) rate, indicating additive effects. Results suggest that both stimuli elicit food searching behavior and when they begin to forage, hatchlings already possess predispositions to respond to an adaptive array of prey shapes and odors.
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Date Issued
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2002
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PURL
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http://purl.flvc.org/fcla/dt/12873
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Subject Headings
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Leatherback turtle, Predation (Biology)
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Format
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Document (PDF)
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Title
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Seafinding orientation of hatchlings exposed to filtered lighting: Effects of varying beach conditions.
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Creator
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Tuxbury, Susan Mary., Florida Atlantic University, Salmon, Michael
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Abstract/Description
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Under normal conditions, hatchling sea turtles crawl toward the ocean but streetlights placed on coastal roadways can attract the turtles toward land. Two light filters were designed to exclude the shorter light wavelengths most attractive to turtles. I did laboratory tests to determine if green turtle and loggerhead hatchlings oriented normally ("seaward") in the presence of filtered lighting. Light passed through either filter (#2422 acrylic and NLW) attracted the turtles unless coastal...
Show moreUnder normal conditions, hatchling sea turtles crawl toward the ocean but streetlights placed on coastal roadways can attract the turtles toward land. Two light filters were designed to exclude the shorter light wavelengths most attractive to turtles. I did laboratory tests to determine if green turtle and loggerhead hatchlings oriented normally ("seaward") in the presence of filtered lighting. Light passed through either filter (#2422 acrylic and NLW) attracted the turtles unless coastal cues (an elevated horizon) were strong or background (full moon) illumination was present. Green turtles and loggerheads responded differently to the same filters, indicating that neither filter provided adequate protection for both species. I conclude that these filters fail to protect the turtles. Conventional forms of light control (shielding and/or lowering light fixtures, decreasing wattage, or turning off problem lights) remain the best way to shield turtles from the harmful effects of artificial lighting.
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Date Issued
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2001
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PURL
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http://purl.flvc.org/fcla/dt/12804
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Subject Headings
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Sea turtles, Light pollution
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Format
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Document (PDF)
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Title
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Spatial and temporal distributions of sea turtles within the Florida Current and surrounding waters and their implications for oceanic energy development.
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Creator
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Bovery, Caitlin M., Wyneken, Jeanette, Graduate College
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Date Issued
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2013-04-12
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PURL
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http://purl.flvc.org/fcla/dt/3361275
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Subject Headings
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Sea turtles, Florida Current, Sea turtles--Conservation
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Format
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Document (PDF)
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Title
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Feeding behavior of loggerhead (caretta caretta) and leatherback (dermochelys coriacea) sea turtles: a model to understand bycatch.
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Creator
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Warraich, Natasha, Wyneken, Jeanette, Graduate College
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Date Issued
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2013-04-12
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PURL
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http://purl.flvc.org/fcla/dt/3361369
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Subject Headings
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Leatherback turtle, Loggerhead turtle, Feeding behavior in animals, Bycatches (Fisheries)
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Format
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Document (PDF)
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Title
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A comparison of stability in swimming loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtle posthatchlings.
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Creator
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Dougherty, Erin., Charles E. Schmidt College of Science, Department of Biological Sciences
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Abstract/Description
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Posthatchling green (Chelonia mydas) and loggerhead (Caretta caretta) turtles overlap ecologically but differ morphologically. This study compared hydrodynamic stability between the two species during swimming to test for functional differences in body shape. Flipper movement paths, four stability measures (yaw, pitch, heave, and sideslip), and the relative positions of the centers of buoyancy and gravity were compared between species. Both centers of buoyancy and gravity lie in the anterior...
Show morePosthatchling green (Chelonia mydas) and loggerhead (Caretta caretta) turtles overlap ecologically but differ morphologically. This study compared hydrodynamic stability between the two species during swimming to test for functional differences in body shape. Flipper movement paths, four stability measures (yaw, pitch, heave, and sideslip), and the relative positions of the centers of buoyancy and gravity were compared between species. Both centers of buoyancy and gravity lie in the anterior body; their positions relative to one another differed with species, but showed no functional consequences. Neither species demonstrated substantial yaw, sideslip, or pitch. Both experienced upward heave with the flippers' downstroke and downward heave with the upstroke; however phase relationships differed between these limb and body motions. No differences were found between the two species. Despite obvious morphological differences, loggerheads and green turtles were similarly stable during swimming, suggesting that the species use different mechanisms to achieve stability.
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Date Issued
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2009
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PURL
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http://purl.flvc.org/FAU/186689
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Subject Headings
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Sea turtles, Morphology, Sea turtles, Physiology, Animal locomotion, Marine ecology
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Format
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Document (PDF)
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Title
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Calcium requirement and growth in the hatchling loggerhead sea turtle (Caretta caretta L.).
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Creator
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Alexander, Jeanne Louise., Florida Atlantic University, Wyneken, Jeanette
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Abstract/Description
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The calcium requirement in captive-raised hatchling loggerhead sea turtles (Caretta caretta) was investigated. Comparisons were made among turtles on 6 experimental diets and between captive and wild turtles. Diets consisted of trout chow diets containing 1%, 2%, 3%, or 4% calcium and 1.65% phosphorous, AquaMax 500RTM (2% Ca), and shrimp. Feeding trials lasted 28 days and changes in body size and bone density were measured. The calcium and phosphorous content of foods eaten by post-hatchlings...
Show moreThe calcium requirement in captive-raised hatchling loggerhead sea turtles (Caretta caretta) was investigated. Comparisons were made among turtles on 6 experimental diets and between captive and wild turtles. Diets consisted of trout chow diets containing 1%, 2%, 3%, or 4% calcium and 1.65% phosphorous, AquaMax 500RTM (2% Ca), and shrimp. Feeding trials lasted 28 days and changes in body size and bone density were measured. The calcium and phosphorous content of foods eaten by post-hatchlings in the sargassum were compared with captive diets. Results showed that shrimp was high in protein and low in calcium, with nearly twice as much P as Ca. The growth trials showed that turtles fed shrimp versus all other diets grew larger. There was no difference in total bone density of any treatment over the study. No signs of hypocalcemia were present, therefore, no lower limit for calcium requirement was determined in this study.
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Date Issued
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2000
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PURL
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http://purl.flvc.org/fcla/dt/12708
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Subject Headings
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Loggerhead turtle, Sea turtles--Nutrition, Calcium in animal nutrition
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Format
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Document (PDF)
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Title
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Effects on beach renourishment on the survival of loggerhead sea turtles.
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Creator
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Broadwell, Ann L., Florida Atlantic University, Salmon, Michael
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Abstract/Description
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The fate of loggerhead (Caretta caretta, L.) clutches at four physically different beaches, including a renourished site, was investigated in the Boca Raton area. I compared the four sites with regard to their thermal environment, moisture content, sand grain size, and pore spacing at depths of a typical nest. Significantly more sea turtle hatchlings emerged from nests deposited on the renourished beach than at the other sites. At the renourished beach moisture content and pore spacing were...
Show moreThe fate of loggerhead (Caretta caretta, L.) clutches at four physically different beaches, including a renourished site, was investigated in the Boca Raton area. I compared the four sites with regard to their thermal environment, moisture content, sand grain size, and pore spacing at depths of a typical nest. Significantly more sea turtle hatchlings emerged from nests deposited on the renourished beach than at the other sites. At the renourished beach moisture content and pore spacing were highest. Pore spacing and moisture content correlated negatively with the number of hatchlings which died in the nest, and correlated positively with emergence success. At the natural beach, hatchling weight was lowest and straight-line carapace length (SLC) was shortest. I conclude that at the renourished beach, conditions favored hatchling production. However, that may not be the case in all instances of renourishment, as effects probably vary with the nature of the sands used to replenish the beach.
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Date Issued
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1991
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PURL
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http://purl.flvc.org/fcla/dt/14749
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Subject Headings
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Loggerhead turtle--Reproduction, Loggerhead turtle--Florida
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Format
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Document (PDF)
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Title
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Orientation of hatchling loggerhead sea turtles in response to the inclination of the magnetic field.
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Creator
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Light, Phillip Richard, Florida Atlantic University, Salmon, Michael, Charles E. Schmidt College of Science, Department of Biological Sciences
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Abstract/Description
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Recent studies have shown that hatchling loggerhead sea turtles possess the ability to orient to the earth's magnetic field. These experiments did not identify the specific component of the field used by turtles to determine direction. One of the field's most important characteristics, inclination, has been implicated as the specific property used by birds to orient. This study investigated the possibility that sea turtles use the inclination of the earth's field in a similar manner. Results...
Show moreRecent studies have shown that hatchling loggerhead sea turtles possess the ability to orient to the earth's magnetic field. These experiments did not identify the specific component of the field used by turtles to determine direction. One of the field's most important characteristics, inclination, has been implicated as the specific property used by birds to orient. This study investigated the possibility that sea turtles use the inclination of the earth's field in a similar manner. Results show that turtles determine direction with the use of an inclination compass similar to the one used by birds to orient. This study has important implications regarding the mechanisms used by animals to orient and navigate.
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Date Issued
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1992
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PURL
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http://purl.flvc.org/fcla/dt/14787
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Subject Headings
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Loggerhead turtle, Animal orientation, Magnetic fields, Sea turtles--Migration
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Format
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Document (PDF)
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Title
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Nest caging as a sea turtle management strategy: Do the benefits outweigh the costs on urban beaches?.
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Creator
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Adamany, Stephanie Lynne., Florida Atlantic University, Salmon, Michael
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Abstract/Description
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Caging of sea turtle nests has used by City of Boca Raton's sea turtle conservation program to deter terrestrial predators and reduce human disturbance. The juxtaposition of nest cages and artificial lighting may pose serious threats to hatchlings. I addressed possible negative effects of cages on sea turtle hatchlings' seafinding abilities and potential "cage-trapping" under natural and artificially illuminated conditions. Cages did not effect hatchling orientation on artificially...
Show moreCaging of sea turtle nests has used by City of Boca Raton's sea turtle conservation program to deter terrestrial predators and reduce human disturbance. The juxtaposition of nest cages and artificial lighting may pose serious threats to hatchlings. I addressed possible negative effects of cages on sea turtle hatchlings' seafinding abilities and potential "cage-trapping" under natural and artificially illuminated conditions. Cages did not effect hatchling orientation on artificially illuminated or dark beaches. Hatchlings did not experience any delay in cage escape on dark beaches, but a significant number were trapped inside the cages on artificially illuminated beaches. The highest incidence of trapping occurred on nights surrounding a new moon. Disoriented hatchlings exited cages either after city lighting was reduced (past midnight) or as natural levels of illumination increased shortly before sunrise. When cages were darkened all turtles escaped but many still exhibited signs of disorientation.
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Date Issued
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1996
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PURL
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http://purl.flvc.org/fcla/dt/15312
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Subject Headings
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Sea turtles--Florida, Sea turtles--Nests
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Format
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Document (PDF)
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Title
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The immunology of green turtle fibropapillomatosis.
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Creator
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Varela, Rene A., Florida Atlantic University, Lutz, Peter L.
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Abstract/Description
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Green Turtle Fibropapillomatosis has been a disease of intense investigation, with little ascertained as to its cause. This investigation thus delved into the possible link between this disease and immune compromise. This was achieved by creating three groups of animals, one characterized as healthy another as diseased, and a third as recovered. Blood taken from each animal was then applied to the four aspects of our investigation: general chemistry, hematology, specialized chemistry, and in...
Show moreGreen Turtle Fibropapillomatosis has been a disease of intense investigation, with little ascertained as to its cause. This investigation thus delved into the possible link between this disease and immune compromise. This was achieved by creating three groups of animals, one characterized as healthy another as diseased, and a third as recovered. Blood taken from each animal was then applied to the four aspects of our investigation: general chemistry, hematology, specialized chemistry, and in vitro cell proliferation to establish the best diagnostic cues. General chemistry, hematology, and specialized chemistry proved to be inconsequential in elucidating the effects of possible immune compromise. In vitro cell proliferation, though, proved conclusively that t and b like cells were severely depressed in diseased and "recovered" animals, giving conclusive evidence of immune dysfunction in association with fibropapillomatosis.
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Date Issued
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1997
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PURL
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http://purl.flvc.org/fcla/dt/15518
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Subject Headings
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Green turtle--Diseases, Green turtle--Immunology
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Format
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Document (PDF)
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Title
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The magnetic compass of the loggerhead sea turtle (Caretta caretta L.): Can surface waves establish magnetic directional preference?.
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Creator
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Goff, Matthew Douglas, Florida Atlantic University, Salmon, Michael
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Abstract/Description
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Hatchling loggerhead sea turtles emerge from their nests on oceanic beaches, crawl to the surf zone, and swim out to sea. How do turtles maintain oriented headings once they lose contact with land? I tested the hypothesis that by swimming into surface waves hatchlings establish an offshore heading (directional preference), and that once out to sea this heading is transferred to, and maintained by, a magnetic compass. This hypothesis was supported by laboratory and field experiments, described...
Show moreHatchling loggerhead sea turtles emerge from their nests on oceanic beaches, crawl to the surf zone, and swim out to sea. How do turtles maintain oriented headings once they lose contact with land? I tested the hypothesis that by swimming into surface waves hatchlings establish an offshore heading (directional preference), and that once out to sea this heading is transferred to, and maintained by, a magnetic compass. This hypothesis was supported by laboratory and field experiments, described herein. A directional preference can also be established by oriented crawling (from the nest to the surf zone). Thus hatchlings possess two mechanisms (crawling and swimming) for the establishment of an offshore heading. The use of these alternative mechanisms probably assures that turtles escape from shore under the broad range of conditions which they naturally encounter after emerging from their nests.
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Date Issued
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1996
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PURL
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http://purl.flvc.org/fcla/dt/15285
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Subject Headings
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Loggerhead turtle, Sea turtles--Orientation, Animal navigation
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Format
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Document (PDF)
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Title
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The effects of beach renourishment on the nesting behavior and hatching success of the loggerhead sea turtle on Jupiter Island, Florida: A seven year study.
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Creator
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Steinitz, Mary Julie., Florida Atlantic University, Salmon, Michael
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Abstract/Description
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Jupiter Island is a barrier Island on the central East Coast of Florida whose beaches are subject to severe erosion. At intervals of several years, lost sand is replaced by the addition of sand ("renourishment") from other locations. In this study, I determined the effect of sand replacement on sea turtle nesting activity, and on the survival of nests placed on renourished and an adjacent natural beach. Renourishment caused a reduction in nesting activity by the turtles, which lasted about...
Show moreJupiter Island is a barrier Island on the central East Coast of Florida whose beaches are subject to severe erosion. At intervals of several years, lost sand is replaced by the addition of sand ("renourishment") from other locations. In this study, I determined the effect of sand replacement on sea turtle nesting activity, and on the survival of nests placed on renourished and an adjacent natural beach. Renourishment caused a reduction in nesting activity by the turtles, which lasted about two years. Thereafter, turtle nesting on renourished and control beaches was similar. There were no differences in nest survival between the two sites. Renourishment prevents the loss of beach and shoreline property, but is not necessarily beneficial to sea turtles.
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Date Issued
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1996
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PURL
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http://purl.flvc.org/fcla/dt/15292
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Subject Headings
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Loggerhead turtle, Sea turtles--Florida--Jupiter Island, Beach nourishment
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Format
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Document (PDF)
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Title
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The effects of filtered high-pressure sodium lighting on hatchling loggerhead (Caretta caretta L.) and green turtle ( Chelonia mydas L.) hatchlings.
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Creator
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Nelson, Kristen Ann, Florida Atlantic University, Salmon, Michael
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Abstract/Description
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Hatchling sea turtles use visual cues to orient to the water. Streetlights placed on coastal roadways can attract the turtles inland. Filters were designed to be used with coastal roadway lighting to eliminate the more harmful wavelengths of light. I tested the General Electric 2422 and NLW filters in a laboratory setting with hatchling loggerhead and green turtles. Both species of turtles were attracted to the amber filtered lighting in arena experiments. Loggerhead hatchlings were used in T...
Show moreHatchling sea turtles use visual cues to orient to the water. Streetlights placed on coastal roadways can attract the turtles inland. Filters were designed to be used with coastal roadway lighting to eliminate the more harmful wavelengths of light. I tested the General Electric 2422 and NLW filters in a laboratory setting with hatchling loggerhead and green turtles. Both species of turtles were attracted to the amber filtered lighting in arena experiments. Loggerhead hatchlings were used in T-maze experiments where they were given a choice between amber filtered and unfiltered lighting. The turtles preferred the unfiltered lighting to the filtered lighting, even when it was 100 to 1000 times dimmer. I conclude that amber filtered lighting does afford some protection to sea turtles, although it must be used in conjunction with other light management techniques to prevent the disruption of hatchling turtle orientation.
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Date Issued
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2003
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PURL
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http://purl.flvc.org/fcla/dt/12982
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Subject Headings
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Loggerhead turtle, Green turtle, Lighting--Environmental aspects
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Format
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Document (PDF)
Pages