Current Search: Salmon, Michael (x) » Marine turtles (x) » Green turtle (x)
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Title
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Ecological correlates of the abundance of juvenile green sea turtles (Chelonia mydas) on nearshore reefs in southeast Florida.
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Creator
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Stadler, Melanie, Salmon, Michael, Roberts, Charles, 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/3361359
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Subject Headings
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Green turtle, Chelonia mydas, Reefs--Florida
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Format
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Document (PDF)
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Title
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Seafinding by the green turtle, Chelonia mydas: the orientation response is tuned to the lighting environment at the nesting beach.
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Creator
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Celano, Lisa, Salmon, Michael, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
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Abstract/Description
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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
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2018
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PURL
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http://purl.flvc.org/fau/fd/FA00013034
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Subject Headings
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Green turtle, Chelonia mydas, Phototaxis
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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)
