Current Search: Phototaxis (x)
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- Title
- Visual wavelength discrimination by the loggerhead turtle, Caretta caretta.
- Creator
- Young, Morgan, Salmon, Michael, Forward, Richard B., Jr., Graduate College
- Date Issued
- 2011-04-08
- PURL
- http://purl.flvc.org/fcla/dt/3164729
- Subject Headings
- Loggerhead turtle, Spectral sensitivity, Phototaxis
- Format
- Document (PDF)
- 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.
Show less - Date Issued
- 2018
- PURL
- http://purl.flvc.org/fau/fd/FA00013034
- Subject Headings
- Green turtle, Chelonia mydas, Phototaxis
- Format
- Document (PDF)
- Title
- Larval phototaxis in barnacles and snails associated with bathyal sea urchins.
- Creator
- Bingham, Brian L., Young, Craig M., Harbor Branch Oceanographic Institute
- Date Issued
- 1993
- PURL
- http://purl.flvc.org/FCLA/DT/3353878
- Subject Headings
- Phototaxis, Larvae--Behavior, Marine invertebrates
- Format
- Document (PDF)
- Title
- Ontogeny of phototaxis and geotaxis during larval development of the sabellariid polychaete Phragmatopoma lapidosa.
- Creator
- McCarthy, D. A., Forward, Richard B., Jr., Young, Craig M., Harbor Branch Oceanographic Institute
- Date Issued
- 2002
- PURL
- http://purl.flvc.org/FCLA/DT/3350892
- Subject Headings
- Sabellariidae, Polychaeta, Ontogeny, Phototaxis, Geotaxis, Larvae
- Format
- Document (PDF)
- Title
- Ontogenetic changes in phototaxis during larval life of the ascidian Polyandrocarpa zorritensis (Van Name, 1931).
- Creator
- Vazquez, Elsa, Young, Craig M., Harbor Branch Oceanographic Institute
- Date Issued
- 1998
- PURL
- http://purl.flvc.org/FCLA/DT/3331931
- Subject Headings
- Ascidians, Ontogeny, Larvae--Behavior, Styelidae, Phototaxis
- Format
- Document (PDF)
- Title
- EVIDENCE FOR THE INDEPENDENT EVOLUTION OF VISUAL PERCEPTION DURING SEAFINDING BY HATCHLING LEATHERBACK SEA TURTLES (DERMOCHELYS CORIACEA).
- Creator
- Trail, Samantha E., Salmon, Michael, Florida Atlantic University, Department of Biological Sciences, Charles E. Schmidt College of Science
- Abstract/Description
-
Hatchling marine turtles exhibit a positive phototaxis by crawling toward the lowest and brightest horizon when they emerge from nests on the beach at night, which should lead them to the ocean (“seafinding”). Previous research with cheloniid (loggerhead and green turtle) hatchlings demonstrated that the perceptual spectral sensitivities are well below the light available on the beach regardless of lunar phase. The goal of this research was to determine the perceptual spectral sensitivities...
Show moreHatchling marine turtles exhibit a positive phototaxis by crawling toward the lowest and brightest horizon when they emerge from nests on the beach at night, which should lead them to the ocean (“seafinding”). Previous research with cheloniid (loggerhead and green turtle) hatchlings demonstrated that the perceptual spectral sensitivities are well below the light available on the beach regardless of lunar phase. The goal of this research was to determine the perceptual spectral sensitivities of leatherback hatchlings, the most distantly related of all extant sea turtle species. This study revealed that, like cheloniids, leatherbacks are most sensitive to shorter wavelengths (< 500 nm). However, leatherbacks were 10 – 100x less sensitive than cheloniids at all tested wavelengths. This difference in sensitivity corresponds with increased crawl duration and circling behavior under new moon conditions when light levels are lowest and the difference in radiance between the landward and seaward direction is small.
Show less - Date Issued
- 2021
- PURL
- http://purl.flvc.org/fau/fd/FA00013790
- Subject Headings
- Leatherback turtle, Dermochelys coriacea, Phototaxis, Spectral sensitivity
- Format
- Document (PDF)
- Title
- Phototaxis and vertical migration of the queen conch (Strombus gigas linne) veliger larvae.
- Creator
- Barile, Peter J., Stoner, Allan W., Young, Craig M., Harbor Branch Oceanographic Institute
- Date Issued
- 1994
- PURL
- http://purl.flvc.org/FCLA/DT/3331889
- Subject Headings
- Queen conch, Strombus gigas, Larvae--Dispersal, Vertical migration (Aquatic biology), Vertical distribution (Aquatic biology), Phototaxis
- Format
- Document (PDF)