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

Be??ecki, G.; Miltko, R.; Kowalik, B.; Demiaszkiewicz, A.W.; Lachowicz, J.; Obidzi?ski, A.; Gi?ejewski, Z.; McEwan, N.R.


G. Be??ecki

R. Miltko

B. Kowalik

A.W. Demiaszkiewicz

J. Lachowicz

A. Obidzi?ski

Z. Gi?ejewski

N.R. McEwan


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.


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:

Journal Article Type Article
Acceptance Date Oct 4, 2017
Online Publication Date Oct 19, 2017
Publication Date Jan 31, 2018
Deposit Date Jan 25, 2018
Publicly Available Date Oct 20, 2018
Journal Mammal research
Print ISSN 2199-2401
Electronic ISSN 2199-241X
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 63
Issue 1
Pages 21-31
Keywords Digestive tract; Season; Beaver; Food preferences
Public URL


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