Invasive North American beaver Castor canadensis in Eurasia: a review of potential consequences and a strategy for eradication

  title={Invasive North American beaver Castor canadensis in Eurasia: a review of potential consequences and a strategy for eradication},
  author={Howard Parker and Petri Nummi and G{\"o}ran Hartman and Frank Rosell},
Seven North American beavers Castor canadensis (Cc) were introduced into Finland in 1937 to supplement an ongoing reintroduction of the nearly extinct Eurasian beaver C. fiber (Cf). At that time, many zoologists recognised only one species. However, in 1973, chromosome counts (Cf = 48, Cc = 40) acknowledged two species, and Cc became an invasive alien. Recently, expanding populations of both species have converged on two fronts in Finland and northwestern Russia. According to Gause's… 
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