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 general ecology of beavers (Castor spp.), as related to their influence on stream ecosystems... The Eurasian and North American beavers aresimilar in their ecological requirements, andrequire water deep enough to cover the entranceto their lodge or burrow. A food cache isoften built next to the lodge or burrow, exceptin some southern areas. On small streams (upto fourth order) dams are frequently built tocreate an impoundment, generally on lowgradient streams, although at high populationdensities dams may be built on steeper gradientstreams. On large rivers or in lakes, simply alodge with its food cache may be built. Thebeaver is a keystone riparian species in thatthe landscape can be considerably altered byits activities and a new ecosystem created. The stream above a dam changes from lotic tolentic conditions. There are hydrological,temperature and chemical changes, depending ontypes of dams and locations. Although theinvertebrates may be fewer per unit area, totalnumber of organisms increases, and diversityincreases as the pond ages. In cool, smallorder streams, the impoundments provide betterhabitat for large trout, possibly creatingangling opportunities. However, at sites wherewater temperatures rise above their optimumpreferenda, salmonids may be replaced by otherspecies, such as cyprinids, catostomids,percids or centrarchids. As the habitat isaltered, interactions amongst co-habiting species may change. For example, brown troutor brook trout (charr) may become dominant overAtlantic salmon. In warm water streams theremay be a shift from faster water dwellers topond dwellers. Larger bodied fish, such ascentrarchids and esocids may displace smallerbodied fish such as cyprinids, providing betterangling. Refugia from high or low water flows,low oxygen or high temperatures, may beprovided in adverse conditions in winter orsummer. However, in some cases dams areobstructions to upstream migration, andsediment may be deposited in former spawningareas. The practicality and benefits ofintroducing or restoring beaver populationswill vary according to location, and should beconsidered in conjunction with a managementplan to control their densities. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

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

Loading next page...
 
/lp/springer_journal/the-general-ecology-of-beavers-castor-spp-as-related-to-their-Mf98tECPqY
Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Life Sciences; Freshwater & Marine Ecology; Zoology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1023/A:1012262217012
Publisher site
See Article on Publisher Site

Abstract

The Eurasian and North American beavers aresimilar in their ecological requirements, andrequire water deep enough to cover the entranceto their lodge or burrow. A food cache isoften built next to the lodge or burrow, exceptin some southern areas. On small streams (upto fourth order) dams are frequently built tocreate an impoundment, generally on lowgradient streams, although at high populationdensities dams may be built on steeper gradientstreams. On large rivers or in lakes, simply alodge with its food cache may be built. Thebeaver is a keystone riparian species in thatthe landscape can be considerably altered byits activities and a new ecosystem created. The stream above a dam changes from lotic tolentic conditions. There are hydrological,temperature and chemical changes, depending ontypes of dams and locations. Although theinvertebrates may be fewer per unit area, totalnumber of organisms increases, and diversityincreases as the pond ages. In cool, smallorder streams, the impoundments provide betterhabitat for large trout, possibly creatingangling opportunities. However, at sites wherewater temperatures rise above their optimumpreferenda, salmonids may be replaced by otherspecies, such as cyprinids, catostomids,percids or centrarchids. As the habitat isaltered, interactions amongst co-habiting species may change. For example, brown troutor brook trout (charr) may become dominant overAtlantic salmon. In warm water streams theremay be a shift from faster water dwellers topond dwellers. Larger bodied fish, such ascentrarchids and esocids may displace smallerbodied fish such as cyprinids, providing betterangling. Refugia from high or low water flows,low oxygen or high temperatures, may beprovided in adverse conditions in winter orsummer. However, in some cases dams areobstructions to upstream migration, andsediment may be deposited in former spawningareas. The practicality and benefits ofintroducing or restoring beaver populationswill vary according to location, and should beconsidered in conjunction with a managementplan to control their densities.

Journal

Reviews in Fish Biology and FisheriesSpringer Journals

Published: Oct 8, 2004

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off