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Seasonal variations of the digestive tract of the Eurasian beaver castor fiber.

Bełżecki, G.; Miltko, R.; Kowalik, B.; Kędzierska, A.; Demiaszkiewicz, A.W.; Lachowicz, J.; Giżejewski, Z.; Obidziński, A.; Giżejewski, Z.; McEwan, N.R.

Authors

G. Bełżecki

R. Miltko

B. Kowalik

A. Kędzierska

A.W. Demiaszkiewicz

J. Lachowicz

Z. Giżejewski

A. Obidziński

Z. Giżejewski

N.R. McEwan



Abstract

Forage availability for wild rodents varies with season. In turn, the composition of food can affect morphometric parameters of the digestive tract. This study was performed in Eurasian beavers (Castor fiber) whose population was close to extinction in most Eurasian countries, but has now increased. Due to the previous low number of studies, information about the effect of forage availability on the digestive tract morphology has previously been lacking. This study was performed using beavers captured from the natural environment during three seasons of different forage availability: winter, summer and autumn. It was found that the diet of the beaver varied during the year; in winter it was dominated by woody material consisting of willow shoots, whereas in summer the diet was primarily herbs, grass and leaves. Season also affected the mass of digested contents of the digestive tract. The digestive content increased in the caecum and colon in winter and autumn, when poor-quality food dominated the beaver's diet. The results indicated that the digestive tract parameters of beavers varied based on the composition of available forage.

Journal Article Type Article
Publication Date Jan 31, 2018
Journal Mammal research
Print ISSN 2199-2401
Electronic ISSN 2199-241X
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 63
Issue 1
Pages 21-31
Institution Citation BELZECKI, G., MILTKO, R., KOWALIK, B., DEMIASZKIEWICZ, A.W., LACHOWICZ, J., GIZEJEWSKI, Z., OBIDZINSKI, A., and MCEWAN, N.R. 2018. Seasonal variations of the digestive tract of the Eurasian beaver castor fiber. Mammal research [online], 63(1), pages 21-31. Available from: https://doi.org/10.1007/s13364-017-0337-x
DOI https://doi.org/10.1007/s13364-017-0337-x
Keywords Digestive tract; Season; Beaver; Food preferences

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