Ecological impact of beavers Castor fiber and Castor canadensis and their ability to modify ecosystems

  title={Ecological impact of beavers Castor fiber and Castor canadensis and their ability to modify ecosystems},
  author={Frank Rosell and Orsolya Bozs{\'e}r and Peter L. Collen and Howard Parker},
  journal={Mammal Review},
The genus Castor comprises two species: the Eurasian beaver Castor fibre , and the North American beaver Castor canadensis . Both species suffered from overexploitation, but have seen a revival since the 1920s due to increased protection and reintroduction programmes. Increases in the populations and distributions of species that are able to modify ecosystems have generated much scientific interest. Here we review the available literature concerning the possible ecological impact of beaver… 

Riparian habitat modelling in the context of beavers ( Castor fiber ) repopulation in Braşov, Romania

The reintroduction of Eurasian beaver (Castor fiber) in Romania started in 1998 and was a complete success in terms of population and natural range enlargement. The habitat modelling capacity of

Impacts of a Non-indigenous Ecosystem Engineer, the American Beaver (Castor canadensis), in a Biodiversity Hotspot

Non-native species having high per capita impacts in invaded communities are those that modulate resource availability and alter disturbance regimes in ways that are biologically incompatible with

The impact of beavers' (Castor fiber L.) lodges on vascular plant species diversity in forest landscape

It is concluded that beavers' lodges contribute to the increase in the diversity of habitats and subsequently may be re- garded as an important factor influencing flora and vegetation biodiversity.

Assessment of the newly reintroduced beavers (Castor fiber) in Denmark and their habitat demands

Popular science summary: Beavers are back in Denmark The beaver Castor fiber is an animal which used to be common in most places all over Europe. The beaver has also been an important resource for

The impacts of beavers Castor spp. on biodiversity and the ecological basis for their reintroduction to Scotland, UK

The mechanisms by which beavers act as ecosystem engineers are investigated, the possible impacts of beavers on the biodiversity of Scotland are discussed, and a widespread positive influence on biodiversity is expected, if beavers are widely reintroduced.

Habitat selection of the Eurasian beaver (Castor fiber) near its carrying capacity: an example from Norway

Although most of the tested habitat variables were important for both populations expanding and populations near their carrying capacities, there were significant differences in the importance of the presence of shrub and (or) hardwood on the riverbank and the river flow speed.

Recovery and status of native and introduced beavers Castor fiber and Castor canadensis in France and neighbouring countries

The review of beaver origin and distribution in these countries may contribute to the development of appropriate national management strategies and towards important decisions, e.g. the decision to try to keep Rhone beavers genetically isolated, or to allow populations to mix.

Reintroduced Eurasian beavers (Castor fiber): colonization and range expansion across human-dominated landscapes

The protected Eurasian beaver Castor fiber is recolonizing its former range hereby entering human-dominated landscapes. This ecosystem engineer can cause considerable damage to human infrastructures

Qualitative and quantitative effects of reintroduced beavers on stream fish

Reintroduction of beaver (Castor spp) may facilitate rehabilitation of freshwater habitats providing a cost-effective sustainable means of improving ecological conditions. Despite extensive research,



Small mammals, ectomycorrhizae, and conifer succession in beaver meadows

Beaver (Castor canadensis) build dams and create ponds on streams within forested areas. Upon abandonment, ponds often drain and the subsequent meadows persist for decades as graminoid patches that

Macrophyte succession in Minnesota beaver ponds

Ponds of intermediate age (11–40 years) had the highest diversity, with both floating-leaved and submersed life forms represented, and Compositional trends were best explained by propagule dispersal traits.

Ecosystem Alteation of Boreal Forest Streams by Beaver (Castor Canadensis)

Beaver (Castor canadensis) alter the structure and dynamics of aquatic ecosystems with a minimum of direct energy or nutrient transfer. Through dam building and feeding activities, beaver act as a

Beaver as Engineers: Influences on Biotic and Abiotic Characteristics of Drainage Basins

We review how beaver (Castor canadensis) affect ecosystem states and processes (e.g., biogeochemical cycles, nutrient retention, geomorphology, biodiversity, community dynamics, and structural

Comeback of the beaver Castor fiber : an overview of old and new conservation problems

Browse selection by beaver: effects on riparian forest composition

Intense beaver foraging of trembling aspen decreased tree density and basal area by as much as 43% within ~ 1-ha forage zones surrounding two beaver ponds in northern Minnesota, with long-term implications to forest succession and dynamics.

The general ecology of beavers (Castor spp.), as related to their influence on stream ecosystems and riparian habitats, and the subsequent effects on fish – a review

The practicality and benefits of reintroducing or restoring beaver populations will vary according to location, and should be considered in conjunction with a managementplan to control their densities.


ABSTRACT: Beaver (Castor canadensis) are habitat‐modifying keystone species, and their activities broadly influence many other plants and animals. Beaver are especially important to waterfowl in the

Effects of beaver dams on the fish fauna of forest streams

Structure and function of a benthic invertebrate stream community as influenced by beaver (Castor canadensis)

The results suggest that current paradigms applied to lotic ecosystems need to be reevaluated to incorporate the influence of beaver upon invertebrate communities.