Science database

KNOWLEDGE BASE

We have gathered decades of scientific research from Great Britain, continental Europe and North America to share with people interested in diving deeper into the world of beavers.

This list of resources is being constantly amended and updated.

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Showing 525 articles

Safety Assessment of Castoreum Extract as a Food Ingredient

Published by: American Journal of Toxicology

1st January 2007

Castoreum extract is a natural substance derived from beaver scent glands. This article assembles the research on its toxicity as a food additive. Based on the limited current data, consuming castoreum extract at current levels is deemed safe. Its long-term use throughout history without reported adverse effects supports this conclusion. It is regarded as safe by regulatory bodies. Overall, using castoreum extract at current levels poses no safety concerns. Please note, this resource is not open-access.

Prevalence of microsporidia, Cryptosporidium spp., and Giardia spp. in beavers (Castor canadensis) in Massachusetts

Published by: Journal of Zoo and Wildlife Medicine

1st December 2006

Between 2002 and 2004, feces from 62 beavers in the USA were tested for certain parasite species using microscopy and genetic analysis. The study showed that 6.4% of the beavers, all young ones, had these parasites.

Experiences with Beaver Damage and Attitudes of Massachusetts Residents Toward Beaver

Published by: Wildlife Society Bulletin

1st December 2006

One challenge of managing conflicts between humans and beavers is the fact that people's views vary and change over time. In the USA, after a law was passed banning certain beaver traps, surveys were carried out to understand public opinion. This article reports on these surveys. Overall, people had positive views of beavers but those who had had negative experiences with beavers held less favourable views. The authors suggest that conservation efforts should be responsive to changing public attitudes. Please note, this resource is not open-access.

Simulated winter browsing may lead to induced susceptibility of willows to beavers in spring

Published by: Canadian Journal of Zoology

1st December 2006

This study tested the impact of Eurasian beavers browsing on willow plants in winter. They simulated beaver browsing by pruning willow shrubs in February and comparing the shoots with those of shrubs that had not been pruned. The new shoots were tested in May and November. In May, pruned shoots were more nutritious and were preferred by beavers. In November, there was no difference in nutrition nor in beaver preference. This suggests that, after browsing, willows prioritise regrowth rather than any type of defense mechanism.

Patterns of Beaver Colonization and Wetland Change in Acadia National Park

Published by: Northeastern Naturalist

1st December 2006

The return of beavers to a National Park in the USA has led to an 89% increase in wetland habitats between 1944 and 1997. Beavers had converted forested areas to open water and wetlands, benefiting pond-breeding amphibians by providing more breeding sites. Beavers initially favoured larger, lower sites, but later on, beaver sites were smaller and higher up the river. Many were abandoned, creating a diverse habitat mosaic. Please note, this resource is not open-access.

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