Student Vision Paragraphs |
Last updated on Wednesday, 10/02/02, at 08:32 PM by |
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http://www.swflorida.com/turtletime/lighting.htm light may reach the beach indirectly by reflecting off buildings or trees that are visible from the beach. Bright or numerous sources, especially those directed upward, will illuminate sea mist and low clouds, creating a distinct glow visible from the beach. This "urban skyglow" is common over brightly lighted areas. Although some indirect lighting may be perceived as nonpoint-source light pollution, contributing light sources can be readily identified and include sources that are poorly directed or are directed upward. Indirect lighting can originate far from the beach. Although most of the light that sea turtles can detect can also be seen by humans, observers should realize that some sources, particularly those emitting near- ultraviolet and violet light (e.g., bug-zapper lights, white electric- discharge lighting) will appear brighter to sea turtles than to humans. A human is also considerably taller than a hatchling; however, an observer on the dry beach who crouches to the level of a hatchling may miss some lighting that will affect turtles. Because of the way that some lights are partially hidden by the dune, a standing observer is more likely to see light that is visible to hatchlings and nesting turtles in the swash zone. http://www.swflorida.com/turtletime/lighting.htm The eyes of sea turtles provide them with good underwater vision, but are less useful above the water’s surface where they give the turtle a near-sighted view of the world. There is a gland near the eye that releases excess salt and fluids in order to keep the eyes moist when females are on land and also to help the turtle rid itself of the salt it ingests when drinking sea water. http://www.swflorida.com/turtletime/anatomy.htm Low-pressure sodium vapor (LPS) lighting (minimally disruptive).-- LPS is by far the least disruptive light source among those commonly used. LPS sources emit a light that is pure (monochromatic) yellow, a region of the spectrum that is only weakly attractive or even aversive (at higher intensities for loggerheads only) to orienting hatchlings. Because LPS sources have poor color rendition, they are used principally for outdoor applications. http://www.swflorida.com/turtletime/lighting/appendix_a.htm Nesting occurs from May through August. Close drapes or blinds after dark. Use 25 watt yellow-bug lights where exterior lighting is necessary. Color-tinted incandescent lighting (yellow and red) (minimally to moderately disruptive).-- Yellow or amber incandescent light bulbs (bug lights) are generally only weakly attractive to hatchlings for the same reason that they attract few insects -- they emit little short-wavelength light. Although they are minimally disruptive for the most part, bug lights can interfere with sea-finding if they are numerous, of high wattage, or close to the nesting beach. Red-tinted incandescent sources are more variable in color than bug lights. Some red sources can turn purple or pinkish over time (an indication of greater short-wavelength emission) and become more attractive to hatchlings. http://www.swflorida.com/turtletime/lighting/appendix_a.htm T he main thing that needs to be addressed in the amount of light that reaches the beachs, whether disectly or by being reflect off trees, buildings or the sky. The issue that our discussion focused on was that of the light meter. She informed us that they have done all of the necessary research to prove that light from beach is harmful. The whole turtle time deals with types of lights and the mountings that are in that are the most and least harmful. The make it seam relatively simple to fix the problem: reduce the light reaching the beachs, by shielding, turning off, reducing the wattage, ect. She stressed the need for an impliment that can be used to measuer the amount of light on a beach so that they can say, this is to light, or this is alright with out it being an opinion. I think we need to redirect our attention to photogaphers who could tell us about light meters that already exist to measure light for photographs, and then explore the posibility of modifying them to "read" light that is farther away and off less brightness than what the photographers use.The studies have proposed the specific synaptic circuitry responsible
for color processing in turtle retina. The cell were first characterize
electrophysiologically and it's center surrounded by inhibitory region. This region
response to the color activities of Turtle about the stuff that they can see. Their color
coded center was surrounded by red sensitive surrounding . so this pattern shows that they
are attractive toward the light red color. Synaptic circulatory system is responsible for
the color opponent signal processing in the inner retina of the turtle which makes them
see stuff. Retinal disparity is the fact that two images fall on the different places of
the retina of each eye. However, the nasal portion in retina interpolate as the difference
in depth. Deuternopoles vision turtle have difficulty in discriminating between red,
orange and yellow. Tritanopes vision turtle have a trouble with blue and yellow color. The
logo style of the turtle is inherited for the graphical interpretation of L system.
Also, turtle Cove is a co-creative group of process that will birth the power and spirit
of place in their eyes. Color Vision The eyes of sea turtles provide them with good underwater vision, but are less useful above the water’s surface where they give the turtle a near-sighted view of the world. There is a gland near the eye that releases excess salt and fluids in order to keep the eyes moist when females are on land and also to help the turtle rid itself of the salt it ingests when drinking sea water. <A HREF="http://www.swflorida.com/turtletime/anatomy.htm">Turtle Time Anatomy : Sea Turtle Anatomy</A> Florida beaches account for one third of the
world's total population of loggerheads. 91% of the loggerheads in the US live on Florida
beaches. <A HREF="http://www.turtles.org/loggerd.htm"> Loggerhead
Turtles</A> Low-pressure sodium vapor (LPS) lighting (minimally disruptive).--
LPS is by far the least disruptive light source among those commonly used. LPS sources
emit a light that is pure (monochromatic) yellow, a <A HREF="http://www.swflorida.com/turtletime/lighting/appendix_a.htm">Turtle Time : Beach Lighting : Light Pollutio...</A> Red light-emitting diode (LED) lighting (minimally disruptive).-- LEDs are miniature lamps that are not commonly used outdoors. In the future, LEDs may be used to a greater extent as sign lighting and pathway lighting. Red LEDs come close to being ideal for use near sea turtle nesting beaches. Red LEDs emit a pure-red light that does not vary in color over the life of the lamp, and because they are small, they light only a limited area. They are easy to hide from the beach and have a very long life. Green and amber LEDs are marketed but are much less preferred than red. <A HREF="http://www.swflorida.com/turtletime/lighting/appendix_a.htm">Turtle Time : Beach Lighting : Light Pollutio...</A> Neon tubes (minimally disruptive).-- True neon tubes (not tinted tubes) are a pure-red light source. At present, neon is used almost exclusively for decorative purposes. Neon tubes can be difficult to shield, but their color makes them minimally disruptive. Potential applications include pathway and ground-level lighting. <A HREF="http://www.swflorida.com/turtletime/lighting/appendix_a.htm">Turtle Time : Beach Lighting : Light Pollutio...</A> Neon tubes (minimally disruptive).-- True neon tubes (not tinted tubes) are a pure-red light source. At present, neon is used almost exclusively for decorative purposes. Neon tubes can be difficult to shield, but their color makes them minimally disruptive. Potential applications include pathway and ground-level lighting. <A HREF="http://www.swflorida.com/turtletime/lighting/appendix_a.htm">Turtle Time : Beach Lighting : Light Pollutio...</A> If hand-held lighting is to be used, deep-red filters should be fastened over the lens of the source. Red light appears much brighter to humans than it does to sea turtles and does not degrade the night vision of people using it. <A HREF="http://www.swflorida.com/turtletime/lighting/appendix_a.htm">Turtle Time : Beach Lighting : Light Pollutio...</A> Last updated on Wednesday, 10/02/02, at 08:32 PM by |