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Seafinding by the green turtle, Chelonia mydas: the orientation response is tuned to the lighting environment at the nesting beach
Title
Seafinding by the green turtle, Chelonia mydas: the orientation response is tuned to the lighting environment at the nesting beach.
Creator
Celano, Lisa, Salmon, Michael, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Hatchling marine turtles use visual cues to orient from their nest to the sea at night. However, the wavelengths of light that carry this information have not been properly documented, nor do we understand why they are favored. I measured wavelength irradiance at 20 nm intervals between 340 – 600 nm at a dark nesting beach and then, in the laboratory, determined the thresholds of the hatchlings for each λ that evoked a positive phototaxis. In this study, I show that green turtle hatchlings...
Show moreHatchling marine turtles use visual cues to orient from their nest to the sea at night. However, the wavelengths of light that carry this information have not been properly documented, nor do we understand why they are favored. I measured wavelength irradiance at 20 nm intervals between 340 – 600 nm at a dark nesting beach and then, in the laboratory, determined the thresholds of the hatchlings for each λ that evoked a positive phototaxis. In this study, I show that green turtle hatchlings are (i) most sensitive to the shorter (360 – 480 nm) light wavelengths. Those light energies (ii) dominated the available natural lighting at the nesting beach. They also (iii) presented a steep gradient in irradiance between a landward and seaward view, an important cue for orientation. I attribute the phototactic responses to “stimulus filtering”, the outcome of natural selection that optimizes behavioral responses (seafinding) according to their function, as well as when and where they occur.
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Date Issued
2018
PURL
http://purl.flvc.org/fau/fd/FA00013034
Subject Headings
Green turtle, Chelonia mydas, Phototaxis
Format
Document (PDF)
Altered in vitro immune responses in green turtles (Chelonia mydas) with fibropapillomatosis
Title
Altered in vitro immune responses in green turtles (Chelonia mydas) with fibropapillomatosis.
Creator
Cray, C., Varela, Rene A., Bossart, Gregory D., Lutz, Peter L., Harbor Branch Oceanographic Institute
Date Issued
2001
PURL
http://purl.flvc.org/fau/fd/FA00007242
Subject Headings
Green turtle, Chelonia mydas, Papilloma, Immune system
Format
Document (PDF)
Ecological correlates of the abundance of juvenile green sea turtles (Chelonia mydas) on nearshore reefs in southeast Florida
Title
Ecological correlates of the abundance of juvenile green sea turtles (Chelonia mydas) on nearshore reefs in southeast Florida.
Creator
Stadler, Melanie, Salmon, Michael, Roberts, Charles, Graduate College
Date Issued
2013-04-12
PURL
http://purl.flvc.org/fcla/dt/3361359
Subject Headings
Green turtle, Chelonia mydas, Reefs--Florida
Format
Document (PDF)
Fibropapillomatosis in stranded green turtles (Chelonia mydas) in Florida: 20 years of spatiotemporal trends and associations with environmental factors
Title
Fibropapillomatosis in stranded green turtles (Chelonia mydas) in Florida: 20 years of spatiotemporal trends and associations with environmental factors.
Creator
Niland, Hannah, Perrault, Justin, Salmon, Michael, Florida Atlantic University, Department of Biological Sciences, Charles E. Schmidt College of Science
Abstract/Description
Fibropapillomatosis (FP) is a tumor disease that has reached panzootic proportions in green turtles (Chelonia mydas). FP is associated with chelonid alphaherpesvirus 5, although the etiology of FP is likely multifactorial, since high FP prevalence is often observed in degraded habitats. However, specific environmental cofactors for tumor development remain unknown. To explore this, I collated statewide green turtle stranding data from 2000–2020 to evaluate spatiotemporal trends of FP in...
Show moreFibropapillomatosis (FP) is a tumor disease that has reached panzootic proportions in green turtles (Chelonia mydas). FP is associated with chelonid alphaherpesvirus 5, although the etiology of FP is likely multifactorial, since high FP prevalence is often observed in degraded habitats. However, specific environmental cofactors for tumor development remain unknown. To explore this, I collated statewide green turtle stranding data from 2000–2020 to evaluate spatiotemporal trends of FP in Florida, and co-analyzed these data alongside patterns of river flow, chlorophyll-a (Chla), sea surface temperature (SST), El Niño (ENSO), and red tide (HAB). I found that FP was stable during 2000–2020. HAB (positively) and SST (negatively) correlated with statewide FP prevalence, as well as several interactions between various factors. These results suggest that SST and HABs may act as cofactors in the development of FP, and future work should be equally interdisciplinary in their investigation of this multifactorial disease
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Date Issued
2023
PURL
http://purl.flvc.org/fau/fd/FA00014191
Subject Headings
Green sea turtles, Chelonia mydas, Sea turtles--Diseases
Format
Document (PDF)
Polychlorinated biphenyls and p,p’-DDE in loggerhead and green postyearling Atlantic sea turtles
Title
Polychlorinated biphenyls and p,p’-DDE in loggerhead and green postyearling Atlantic sea turtles.
Creator
McKim, James M., Jr., Johnson, Kenneth L., Harbor Branch Oceanographic Institute
Date Issued
1983
PURL
http://purl.flvc.org/FCLA/DT/3176716
Subject Headings
Sea turtles, Polychlorinated biphenyls, Green turtle, Loggerhead turtle, Chelonia mydas, Caretta caretta, Pesticides
Format
Document (PDF)
Incubation Temperature Effects on Loggerhead (Caretta caretta) and Green (Chelonia mydas) Sea Turtle Hatchling Vigor
Title
Incubation Temperature Effects on Loggerhead (Caretta caretta) and Green (Chelonia mydas) Sea Turtle Hatchling Vigor.
Creator
Henaghan, Christopher, Milton, Sarah, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Climate change has the potential to expose sea turtle nests to higher temperatures, which may negatively impact sea turtle hatchling vigor. In this study, loggerhead and green hatchlings were sampled from the Boca Raton, Florida beach and via lab incubation, and hatchling vigor was determined. Elevated nest temperatures decreased loggerhead and green turtle hatchling performance and corticosterone levels, with the most significant effects found in hatchlings exposed to maximum incubation...
Show moreClimate change has the potential to expose sea turtle nests to higher temperatures, which may negatively impact sea turtle hatchling vigor. In this study, loggerhead and green hatchlings were sampled from the Boca Raton, Florida beach and via lab incubation, and hatchling vigor was determined. Elevated nest temperatures decreased loggerhead and green turtle hatchling performance and corticosterone levels, with the most significant effects found in hatchlings exposed to maximum incubation temperatures above 35°C during late development. Lab-incubated loggerhead post-hatchling corticosterone levels and growth rates were also determined. The differences seen in corticosterone levels with overall nest incubation temperatures, mean temperatures during early, middle or late stages of development, and its negative correlation with hatchling performance improves our understanding of the underlying physiological mechanisms linking elevated incubation temperatures and sub-lethal physiological effects that may significantly impact hatchling survival, a critical step for sea turtle conservation in south Florida and elsewhere.
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Date Issued
2018
PURL
http://purl.flvc.org/fau/fd/FA00013157
Subject Headings
Loggerhead turtle--Florida, Caretta caretta, Chelonia mydas, Green turtle, Temperature, Eggs--Incubation
Format
Document (PDF)
USE OF STABLE ISOTOPES TO INFER FORAGING NICHE IN TWO MARINE TURTLE SPECIES: CHELONIA MYDAS AND ERETMOCHELYS IMBRICATA
Title
USE OF STABLE ISOTOPES TO INFER FORAGING NICHE IN TWO MARINE TURTLE SPECIES: CHELONIA MYDAS AND ERETMOCHELYS IMBRICATA.
Creator
Moorehouse, Melissa, Baldwin, John, Florida Atlantic University, Environmental Studies Program, Charles E. Schmidt College of Science
Abstract/Description
Stable isotope analysis is a powerful tool that can be used to describe a population’s foraging niche by identifying basal resource use, trophic feeding levels, environmental stability, seasonal ecological variation, important shifts in life history, ontogenetic shifts, intraspecific habitat use, and population dynamics. Describing these relationships in endangered marine turtle populations and their critical foraging grounds is essential for determining informed management decisions. This...
Show moreStable isotope analysis is a powerful tool that can be used to describe a population’s foraging niche by identifying basal resource use, trophic feeding levels, environmental stability, seasonal ecological variation, important shifts in life history, ontogenetic shifts, intraspecific habitat use, and population dynamics. Describing these relationships in endangered marine turtle populations and their critical foraging grounds is essential for determining informed management decisions. This study systematically describes the foraging niche of hawksbills Eretmochelys imbricata, and green turtles, Chelonia mydas in Buck Island Reef National Monument, U.S. Virgin Islands, a critical habitat for nesting and foraging. It assesses the relationships within and between the species in terms of overlap, annual and seasonal variation, and life history and feeding strategies within the community. Most importantly it describes these relationships with metrics that can be used in global comparisons or to measure change in local conditions.
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Date Issued
2020
PURL
http://purl.flvc.org/fau/fd/FA00013456
Subject Headings
Stable isotopes, Stable isotopes--Analysis, Sea turtles--Ecology, Chelonia mydas, Eretmochelys imbricata
Format
Document (PDF)
INFLUENCE OF UV LIGHT ON VITAMIN D AND IMMUNE FUNCTION OF GREEN (CHELONIA MYDAS) SEA TURTLES WITH FIBROPAPILLOMATOSIS
Title
INFLUENCE OF UV LIGHT ON VITAMIN D AND IMMUNE FUNCTION OF GREEN (CHELONIA MYDAS) SEA TURTLES WITH FIBROPAPILLOMATOSIS.
Creator
Garefino, Victoria E., Milton, Sarah L., Florida Atlantic University, Department of Biological Sciences, Charles E. Schmidt College of Science
Abstract/Description
Green sea turtles (Chelonia mydas) are an endangered species prone to a debilitating disease called fibropapillomatosis (FP). The aim of this study was to determine the influence of UV light on vitamin D levels and immune function in juvenile green sea turtles with FP. Phagocytosis, plasma vitamin D levels and viral load of ChHV5 were measured for FP- and FP+ turtles kept at the Gumbo Limbo Nature Center (GLNC) and for turtles caught at the St. Lucie power plant. Turtles kept at GLNC were...
Show moreGreen sea turtles (Chelonia mydas) are an endangered species prone to a debilitating disease called fibropapillomatosis (FP). The aim of this study was to determine the influence of UV light on vitamin D levels and immune function in juvenile green sea turtles with FP. Phagocytosis, plasma vitamin D levels and viral load of ChHV5 were measured for FP- and FP+ turtles kept at the Gumbo Limbo Nature Center (GLNC) and for turtles caught at the St. Lucie power plant. Turtles kept at GLNC were housed in tanks exposed to varying amounts of UV light. Turtles brought into GLNC had lower phagocytosis compared to turtles at the St. Lucie power plant. Individuals exposed to greater UV light had higher plasma vitamin D levels and a more successful recovery. The results of this project will provide rehabilitation facilities with a mechanism to improve the recovery of animals with this disease.
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Date Issued
2020
PURL
http://purl.flvc.org/fau/fd/FA00013467
Subject Headings
Chelonia mydas, Green turtle--Diseases, Fibropapillomatosis, Ultraviolet radiation, Vitamin D
Format
Document (PDF)
EXPOSURE TO ALGAL BIOTOXINS: EXPLORING HEALTH EFFECTS IN GREEN SEA TURTLES (CHELONIA MYDAS)
Title
EXPOSURE TO ALGAL BIOTOXINS: EXPLORING HEALTH EFFECTS IN GREEN SEA TURTLES (CHELONIA MYDAS).
Creator
Brown, Hunter, Page, Annie, Florida Atlantic University, Department of Marine Science and Oceanography, Charles E. Schmidt College of Science
Abstract/Description
In the inter-coastal waters of Florida, green sea turtles (Chelonia mydas) are regularly exposed to regional blooms of harmful algae which produce biotoxins. A retrospective analysis was conducted on stranded green sea turtles along the Indian River Lagoon, FL, USA. Stranding, necropsy, and histopathology reports were analyzed for 40 juvenile turtles. Liver (N=40) and kidney (N=36) tissues were analyzed for a suite of 14 harmful algal bloom (HAB)-associated biotoxins. Thirty-four (85%)...
Show moreIn the inter-coastal waters of Florida, green sea turtles (Chelonia mydas) are regularly exposed to regional blooms of harmful algae which produce biotoxins. A retrospective analysis was conducted on stranded green sea turtles along the Indian River Lagoon, FL, USA. Stranding, necropsy, and histopathology reports were analyzed for 40 juvenile turtles. Liver (N=40) and kidney (N=36) tissues were analyzed for a suite of 14 harmful algal bloom (HAB)-associated biotoxins. Thirty-four (85%) turtles tested positive for at least one biotoxin, including 21(53%) liver and 22(61%) kidney tissues. Statistically significant relationships were identified between the presence of common histopathological abnormalities and biotoxins of: melanomacrophage/hyperplasia and brevetoxin-3 (P=0.03) in liver tissues, and renal fibrosis and nodularin (P = 0.04) and lymphocytosis and neosaxitoxin (P=0.03) in kidney tissues. These data demonstrate that wild turtles are commonly exposed to HAB-associated biotoxins with potential chronic health effects that contribute to strandings in the Indian River Lagoon.
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Date Issued
2023
PURL
http://purl.flvc.org/fau/fd/FA00014363
Subject Headings
Chelonia mydas, Green sea turtles, Algal toxins, Indian River (Fla. : Lagoon)
Format
Document (PDF)