UV Effects on Animals: Risks of UV Exposure in...
Transcript of UV Effects on Animals: Risks of UV Exposure in...
Health effects of UV radiation on animals - UV research at the
G. Schauberger and A. Schmalwieser WG Environmental Health Department of Biomedical Sciences University of Veterinary Medicine Vienna European Conference on Solar UV Monitoring ECUVM 2018 “UV Monitoring in the European Countries - Past, Present and Future” 12. - 14. September 2018, Vienna, Austria
Content Difference between humans and animals
UV Exposure and health related effects
– Zoo – Farm animals – Pets – Wild animals
Conclusions & Perspectives
Earth surface - ambient UV radiation
Skin surface - skin dose of animals
Protection: hair coat, vegetation and water
Geometry of the skin surface
Behaviour: Exposure time
Skin type ?
Radiation path: Earth - Animal
Transmission of the hair coat
0102030405060708090
100
Tran
smiss
ion
[%]
0 50 100 150 200Hair density [cm-2]
5
2
10 Sun
prot
ectio
n fa
ctor
[ ]
0.0
0.2
0.4
0.6
0.8
1.0
Rela
tive
heig
ht []
0.0 0.2 0.4 0.6 0.8 1.0Relative irradiance []
TreeGrass
Vegetation: Gras and Trees
Spectral Transmission of Water
0102030405060708090
100
Spec
trale
Tra
nsm
issio
n [%
]
300 400 500 600 700Wavelength [nm]
O
C
Geometry
Animals / Heath related effects Zoo Farm animals Pets Wild animals
Skin Eye Vitamin D
Zoo Animals Goal: Mimic the natural habitat
Deficit of UV exposure
• Compensation by artificial sources • Estimation by the UV index (Ferguson et al. (2010)
Health ~ vitamin D deficit
• Rachitis (rickets) and Osteodystrophy • Breeding success (e.g. egg stability)
Vitamin D deficit
Townsend and Cole (1985)
UV Exposure of Zoo Animals
60% of European zoos are using artificial UV sources
of that
48% only for treating reptiles 52% also for mammals and avians
Erythema of pigs
Erythema on pigs
MED (J/m²)
Horse 450 Pig 120 - 350 Cattle 100
UVB erythema in pigs: time course
0123456789
1011121314
Eryt
hem
a in
dex ∆E
I
0 12 24 36 48 60 72 84 96 108 120 132 144Time after UVB exposure (h)
high doses D > 7 MEDmedium doses 1 MED < D < 7 MEDlow doses D < 1 MED
visibility of the erythema ∆EI > 2.5
UVB
Visibility
High dose
Medium dose
Low dose
Cancer eye
Cancer eye (ocular squamous cell carcinoma) around a sparsely pigmented skin area
Cattle Horse
Cancer Eye
Variable Range Odds Ratio Latitude 30 – 45°N 0.79
Altitude (m) 7 - 1800 1.12 UV exposure 300 – 442 1.17
Dugan et al., 1991
Horse
Variable Range Odds Ratio Sunshine duration (h/a) 1800 -3500 2.5
Altitude (m) 700 - 3100 4.6 Cloud cover 0.4 – 0.7 3.4
Anderson und Badzioch, 1991
Cattle
Positive UV effects ?
One-day outdoor exposure
Solarium with a recommended exposure time
Keck et al.(1987)
Photosensibilisation Feed:
Sheep, pig, sometimes cattle, goat, rarely horse Drugs:
Phenothiacin, Trypoflavin, Tetracycline, Mansonil and Sulphonamide and Olaquindox - Pigs, fish and farmer
Skin lesions Actinic keratosis (AK)
• Dogs Short-coated, white-haired, or piebald breeds; “collie nose” (nasal solar dermatitis)
• Cats Pinna, nose, and eyelids of white-faced cats
Almeida et al. (2008)).
Epidemiology
Cumulative incidence of SCC (∆) for beagle dogs
(Nikula et al., 1992)
Risik factors for pets
UV exposure Pigmentation Orientation Hair density
Aquatic Species
Species RAF Phytoplankton motility (Evglena gracilis) 1.5 - 1.9 Phytoplankton photosynthesis (Phaeodactylum sp.) 0.2 -0.3 Phytoplankton photosynthesis (Prorocentrvm micans) 0.3 - 0.4 Phytoplankton photosynthesis, in Antarctic community 0.8 Phytoplankton photosynthesis (Nodularia spumtgena cyanobacteria) 0.2 - 0.2
Bacterioplankton DNA damage (euphotic zone) 1.7 Bacterioplankton DNA damage (surface water) 2.1 – 2.2 Green alga Prasiola stipitata 0.7 Dinoflagellate Gyrodinium dorsum 0.4 Cyanobacterium Anabaena sp 1.0 Corals photosynthesis 0.21
Radiation amplification factor RAF
Huot et al., (2000); Madronich and Flocke, (1995); Rozema et al., (2002); Zepp, (2003)
Fish - Skin Lesions Species Author Chinook salmon Arctic char Brockebank and Armstrong (1994)
Hammerhead shark Lowe and Goodman-Lowe (1996)
Northern Anchovy Pacific Mackerel
Hunter et al. (1979)
Rainbow Trout Dunbar (1959) Bullock and Couts (1985)
Salmon McArdle and Bullock (1987), Kaweewat and Hofer (1997), Rodger (1991)
Koi carp Bullock et al. (1983)
Ecosystem Food chain: 30% of protein is coming from
the sea Carbon: 10% reduction in plankton equal to
the anthropogenic CO2-source Variety of species: Increase of UV exposure
might reduce the number of species
Conclusions Biological effects identical to humans
• Positive effects: Vitamin D synthesis • Skin • Eye • Epidemiology
Systemic effects
Ecosystems
Book chapter soon available
Weihs, Ph., Schmalwieser, A.W., Schauberger, G., 2019. UV Effects on Living Organisms in: Meyers, R.A. (Ed.), Encyclopedia of Sustainability Science and Technology, in press