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Ultraviolet exposure and vitamin D synthesis in a sun-dwelling and a shade-dwelling species of Anolis: are there adaptations for lower ultraviolet B and dietary vitamin D3 availability in the shade?
Physiol Biochem Zool. 2005 Mar-Apr; 78(2):193-200.PB

Abstract

We compared the natural ultraviolet B (UV-B) exposure, dietary vitamin D, and skin-generated vitamin D synthesis for adult males of two species of Jamaican anoles. The more shade-tolerant and thermal-conforming Anolis lineotopus merope, rarely exposed to full sun, experienced less UV-B irradiation in its shady environment than the more heliophilic and thermophilic Anolis sagrei, which frequently basked in full sun during the morning hours (0800-1100 hours). Both species obtained detectable levels of vitamin D(3) in their diet, but the heliophilic A. sagrei obtained more. To compensate for less availability of UV-B and dietary vitamin D, the skin of A. lineotopus merope seems to have acquired a greater sensitivity than that of A. sagrei regarding UV-B-induced vitamin D(3) photobiosynthesis. We assessed this by observing a greater conversion of provitamin D to photoproducts in skin exposed to UV-B from a sunlamp. The reduced skin sensitivity of A. sagrei regarding vitamin D photobiosynthesis may reflect a correlated response associated with less need for vitamin D photobiosynthesis and greater need for UV-B screening capacity as an adaptation to a more damaging UV-B environment. However, the possibility that adaptations for photobiosynthesis of vitamin D and for protection from skin damage could involve independent mechanisms needs investigation. Also, the ability to behaviorally regulate UV-B exposure, as shown for the panther chameleon, would benefit both species of Anolis and should be investigated.

Authors+Show Affiliations

Department of Biology, Texas Christian University, Fort Worth, 76129, USA. g.ferguson@ tcu.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15778939

Citation

Ferguson, Gary W., et al. "Ultraviolet Exposure and Vitamin D Synthesis in a Sun-dwelling and a Shade-dwelling Species of Anolis: Are There Adaptations for Lower Ultraviolet B and Dietary Vitamin D3 Availability in the Shade?" Physiological and Biochemical Zoology : PBZ, vol. 78, no. 2, 2005, pp. 193-200.
Ferguson GW, Gehrmann WH, Karsten KB, et al. Ultraviolet exposure and vitamin D synthesis in a sun-dwelling and a shade-dwelling species of Anolis: are there adaptations for lower ultraviolet B and dietary vitamin D3 availability in the shade? Physiol Biochem Zool. 2005;78(2):193-200.
Ferguson, G. W., Gehrmann, W. H., Karsten, K. B., Landwer, A. J., Carman, E. N., Chen, T. C., & Holick, M. F. (2005). Ultraviolet exposure and vitamin D synthesis in a sun-dwelling and a shade-dwelling species of Anolis: are there adaptations for lower ultraviolet B and dietary vitamin D3 availability in the shade? Physiological and Biochemical Zoology : PBZ, 78(2), 193-200.
Ferguson GW, et al. Ultraviolet Exposure and Vitamin D Synthesis in a Sun-dwelling and a Shade-dwelling Species of Anolis: Are There Adaptations for Lower Ultraviolet B and Dietary Vitamin D3 Availability in the Shade. Physiol Biochem Zool. 2005 Mar-Apr;78(2):193-200. PubMed PMID: 15778939.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ultraviolet exposure and vitamin D synthesis in a sun-dwelling and a shade-dwelling species of Anolis: are there adaptations for lower ultraviolet B and dietary vitamin D3 availability in the shade? AU - Ferguson,Gary W, AU - Gehrmann,William H, AU - Karsten,Kristopher B, AU - Landwer,Allan J, AU - Carman,Elliott N, AU - Chen,Tai C, AU - Holick,M F, Y1 - 2005/02/25/ PY - 2004/07/21/accepted PY - 2005/3/22/pubmed PY - 2005/6/28/medline PY - 2005/3/22/entrez SP - 193 EP - 200 JF - Physiological and biochemical zoology : PBZ JO - Physiol Biochem Zool VL - 78 IS - 2 N2 - We compared the natural ultraviolet B (UV-B) exposure, dietary vitamin D, and skin-generated vitamin D synthesis for adult males of two species of Jamaican anoles. The more shade-tolerant and thermal-conforming Anolis lineotopus merope, rarely exposed to full sun, experienced less UV-B irradiation in its shady environment than the more heliophilic and thermophilic Anolis sagrei, which frequently basked in full sun during the morning hours (0800-1100 hours). Both species obtained detectable levels of vitamin D(3) in their diet, but the heliophilic A. sagrei obtained more. To compensate for less availability of UV-B and dietary vitamin D, the skin of A. lineotopus merope seems to have acquired a greater sensitivity than that of A. sagrei regarding UV-B-induced vitamin D(3) photobiosynthesis. We assessed this by observing a greater conversion of provitamin D to photoproducts in skin exposed to UV-B from a sunlamp. The reduced skin sensitivity of A. sagrei regarding vitamin D photobiosynthesis may reflect a correlated response associated with less need for vitamin D photobiosynthesis and greater need for UV-B screening capacity as an adaptation to a more damaging UV-B environment. However, the possibility that adaptations for photobiosynthesis of vitamin D and for protection from skin damage could involve independent mechanisms needs investigation. Also, the ability to behaviorally regulate UV-B exposure, as shown for the panther chameleon, would benefit both species of Anolis and should be investigated. SN - 1522-2152 UR - https://www.unboundmedicine.com/medline/citation/15778939/Ultraviolet_exposure_and_vitamin_D_synthesis_in_a_sun_dwelling_and_a_shade_dwelling_species_of_Anolis:_are_there_adaptations_for_lower_ultraviolet_B_and_dietary_vitamin_D3_availability_in_the_shade L2 - https://doi.org/10.1086/427055 DB - PRIME DP - Unbound Medicine ER -