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Gregory N. Scott Hendrik H. Nollens, T. S. L. (2019) Evaluation of plasma 25-Hydroxyvitamin D, ionized calcium, and parathyroid hormone in green sea turtles (chelonia mydas) exposed to different intensities of ultraviolet B radiation. Journal of zoo and wildlife medicine, 50 421 - 426 - 6. 
Added by: Sarina (18 Jun 2019 13:06:40 UTC)   Last edited by: Sarina (18 Jun 2019 13:09:00 UTC)
Resource type: Journal Article
DOI: 10.1638/2017-0115
BibTeX citation key: GregoryNScottHendrikHNollens2019
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Categories: Englisch = English
Keywords: Schildkröten = Turtles, UVBreitband = UVBroadband, Vitamin D = Vitamin D
Creators: Gregory N. Scott Hendrik H. Nollens
Collection: Journal of zoo and wildlife medicine
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Abstract
For many reptile species, adequate ultraviolet B (UVB) radiation is essential for proper calcium metabolism. In this study, the effects of UVB radiation on calcium metabolism were evaluated in green sea turtles (Chelonia mydas). 25-Hydroxyvitamin D, parathyroid hormone (PTH), and ionized calcium (iCa) were measured in juvenile (n = 18, 9 indoor, 9 outdoor) and adult (n = 8, 4 indoor, 4 outdoor) turtles. All animals were fed an identical diet. Outdoor animals had access to unfiltered sunlight, whereas indoor animals were housed under artificial lighting without UVB. Mean values for 25-hydroxyvitamin D for the outdoor and indoor groups were 34.33 ± 7.98 nmol/L and 7.11 ± 1.69 nmol/L for juveniles and 73.25 ± 30.34 nmol/L and 14.0 ± 11.52 nmol/L for adults respectively. Mean values for iCa for the outdoor and indoor groups were 0.98 ± 0.07 mmol/L and 0.99 ± 0.06 mmol/L for juveniles and 1.18 ± 0.22 mmol/L and 0.97 ± 0.18 mmol/L for adults respectively. UVB exposure (P < 0.001) and age (P < 0.001) had a significant effect on 25-hydroxyvitamin D as well as a significant interaction between the two variables (P = 0.008), with highest values in adult outdoor turtles. There was a significant interaction between age group and UVB status for iCa (P = 0.036), with greater values in older outdoor turtles. 25-Hydroxyvitamin D and total calcium were positively correlated
  
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