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Lighting/Enclosures
Are we overexposing our dragons to UV?
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[QUOTE="kingofnobbys, post: 1896132, member: 81934"] Some real physical data from the natural range of pogona species of the UV irradiance in typical summer months (peak of the pogona breeding season in their natural range) that is not supportive of using UV-Index to control pogona UV irradiation and supports higher levels of UVB irradiation ( and UVA too) than advocated some here. I have several other peer reviewed scientific papers that support my philosophy regarding UV irradiation levels I started investigating what should be best husbandry practices for the species I've been keeping because of my unease about the disparaty and vagueness of the advise given by self appointed lay experts who have little or no formal scientific training who at best can only to provide anecdotal "evidence" unsupported by hard testable observational measurements that can not reproduced or independently tested in any meaningful way ( somewhat of an issue across the board in this hobby of herpetology). No small wonder noobs mess up. Source : Measurements of spectral solar UV irradiance in tropical-Australia. . Bernhard, B. Mayer, and G. Seckmeyer JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. D7, PAGES 8719-8730, APRIL 20, 1997 URL = [url=https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/97JD00072]https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/97JD00072[/url] Notes Spectroradiometers are instruments that measure the intensity of radiation as a function of wavelength. Sampling is generally made at intervals of about 0.5 nm and at relatively high resolution, with full width half intensity (FWHI) less than 1.0 nm. There are two means by which wavelength sampling is carried out. One uses a single detector and mechanically scans the spectrum across the detector to sample the targeted wavelength range one wavelength at a time. The second type of instrument uses relatively new array detectors that measure all wavelengths simultaneously over the targeted spectral range. Both types of spectroradiometers require careful characterization, and significant effort is required to calibrate the instruments and account for any instrumental dependencies. The UV index is based on erythemal (HUMAN skin reddening) exposure, since this has the most immediate short-term impact on humans. It has not been developed nor is relevant to non-human (non- naked mammalian skins ie NOT for reptilian skins or specially evolved skins such that on pogona species , for these there is no model available a.t.m and it is known pogona have evolved the ability to change their skin's IR emissivity and UV albedo at will depending on the temperature and UV irradiance) . Further I have seen scans of the % UV transmissivity of fish and reptile scales as a function of wavelength created using commonly available scanning UV-Vis spectrophotometers (as found in all chemistry laboratories and even in some high schools). Some interesting studies on this (unfortunately didn't include pogona species) is here American Society of Ichthyologists and Herpetologists (ASIH) Copeia Vol. 1959, No. 4, Dec. 30, 1959 pp 311 - 315. Response to photoperiodic exposure to UV [url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4213017/figure/pone-0111504-g003/?report=objectonly]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4213017/figure/pone-0111504-g003/?report=objectonly[/url] sources Cyclic Colour Change in the Bearded Dragon Pogona vitticeps under Different Photoperiods. Marie Fan, Devi Stuart-Fox, and Viviana Cadena PLoS One. 2014; 9(10): e111504 url [url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4213017/]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4213017/[/url] Reptilian Skin and Its Special Histological Structures Catrin Sian Rutland, Pia Cigler and Valentina Kubale Veterinary Anatomy and Physiology : Published: March 13th 2019 url [url=https://www.intechopen.com/books/veterinary-anatomy-and-physiology/reptilian-skin-and-its-special-histological-structures]https://www.intechopen.com/books/veterinary-anatomy-and-physiology/reptilian-skin-and-its-special-histological-structures[/url] VERY BASIC STUFF : The definition of the UV Index is erythemally weighted global irradiance divided by 25 mW / m^2. (or by 25 microW / sq.cm). This yields a non-dimensional value that typically can reach a value of 10 under clear-sky conditions at noon for mid-latitude locations during summer. For subtropical and tropical southern hemisphere sites the value can exceed 16. [/QUOTE]
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