Abstract
We used non-invasive ultrasonography to investigate seasonal changes in liver size of an obligate hibernator; the edible dormouse (Glis glis). We repeatedly measured liver size in dormice at two study sites, (1) an enclosure-housed colony and (2) a free-ranging population. We observed a significant increase in transverse liver size throughout the active season; however, this effect was most pronounced in animals with low body mass early in the active season. Ultrasonography imaging revealed that the content of fat in the liver (distributed in an unexpected pattern of discrete focal areas) visibly increased at the end of the active season both in the field and enclosure. Thus, the observed increase in liver size of dormice seems mainly related to fat accumulation. We found no principal differences in the time courses of transversal liver size between the two study sites. Our results support the view that non-invasive ultrasonography is an accurate method to study internal organ sizes, such as liver, in the laboratory and in the field.
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Acknowledgements
This study was supported by the City of Vienna and the province of Lower Austria. We thank P. Steiger for taking care of the enclosure-housed dormice colony. We thank K. Hittmair for support in the interpretation of the ultrasonographic imaging and R. Drury for helpful comments on the manuscript. We declare that the here presented study complies with protocols approved by the animal care committee of the Veterinary University Vienna, Austria and adhered to the legal requirements of the country Austria, where the study was conducted.
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Bieber, C., Außerlechner, K., Skerget, C. et al. Seasonal changes in liver size in edible dormice (Glis glis): non-invasive measurements using ultrasonography. Eur J Wildl Res 57, 657–662 (2011). https://doi.org/10.1007/s10344-010-0476-8
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DOI: https://doi.org/10.1007/s10344-010-0476-8