bs_bs_banner Mammal Review ISSN 0305-1838 REVIEW Population and distribution of beavers Castor fiber and Castor canadensis in Eurasia Duncan J. HALLEY* Norwegian Institute for Nature Research, PO Box 5685 Sluppen, Trondheim, NO-7485, Norway. Email:
[email protected] Alexander P. SAVELJEV Department of Animal Ecology, Russian Research Institute of Game Management and Fur Farming, 79 Preobrazhenskaya Str., Kirov, 610000, Russia. Email: saveljev.
[email protected] Frank ROSELL Department of Natural Sciences and Environmental Health, Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway, Gullbringveien 36, Bø i Telemark, NO-3800, Norway. Email:
[email protected] Keywords ABSTRACT beaver, Castor fiber, Castor canadensis, distribution, Eurasia, population, 1. A century ago, overhunting had reduced Eurasian beaver Castor fiber popula- reintroduction tions to c. 1200 animals in scattered refugia from France to Mongolia. Reintroductions and natural spread have since restored the species to large *Correspondence author areas of its original range. Population has more than tripled since the first modern estimate in 1998; the minimum estimate is now c. 1.5 million. Received: 4 May 2020 Accepted: 17 June 2020 2. Range expansion 2000–2020 has been rapid, with large extensions in western Editor: DR and south-central Europe, southern Russia, and west and central Siberia. Beavers are now re-established in all countries of their former European doi: 10.1111/mam.12216 range except for Portugal, Italy, and the southern Balkans; they occur broadly across Siberia to Mongolia, with scattered populations father east. About half of the world population lives in Russia. Populations appear to be mature in much of European Russia, Belarus, the Baltic States, and Poland.