author={Mark C. Mckinstry and Paul A. Caffrey and Stanley H. Anderson},
  journal={JAWRA Journal of the American Water Resources Association},
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 western U.S. where riparian and wetland habitats comprise less than 2 percent of the landscape yet provide habitat for greater than 80 percent of wildlife species. Wyoming is currently ranked sixth of the 50 states in the size of its breeding waterfowl population, and beaver ponds may play a… 

Including wildlife habitat in the definition of riparian areas: The beaver (Castor canadensis )a s an umbrella species for riparian obligate animals

A review of riparian invertebrates, amphibians, reptiles, mammals, and birds indicates that a 50 m-wide riparian buffer is the mini- mum area for supporting the majority of riparians obligate species, and that riparian buffers be continuous and integrated in a connectivity plan including upland re- serves.

Invertebrates in Beaver-Created Wetlands and Ponds

Eurasian (Castor fiber) and North American (Castor canadensis) beavers are semiaquatic mammals that modify the hydrology of streams and other water bodies by constructing dams throughout the

Building for the future: Abandoned beaver ponds promote bird diversity

ABSTRACT We examined beaver (Castor canadensis) pond dynamics and associated riparian bird communities, based on call-response surveys. Following water disappearance, abandoned beaver ponds were

Ecology, management, and conservation implications of North American beaver (Castor canadensis) in dryland streams

After near-extirpation in the early 20th century, beaver populations are increasing throughout many parts of North America. Simultaneously, there is an emerging interest in employing beaver activity

Influence of beaver dam density on riparian areas and riparian birds in shrubsteppe of Wyoming

Abstract Through dam-building activity, beavers (Castor canadensis) play an important role in creating pond and wetland habitat for bird communities. Their impact may be intensified in semiarid

Where the wild beavers are: Climate and landscape controls on beaver pond area in snow‐dominated rangeland headwaters

Beavers are of increasing interest as a mechanism for ecosystem restoration. However, the physical watershed characteristics that allow for successful beaver re‐establishment are not consistent

Habitat selection of a reintroduced beaver population in the Absaroka-Beartooth Wilderness

In 1986, a beaver reintroduction program was initiated in the Absaroka-Beartooth Wilderness (AB), Montana, in an effort to restore this species to the landscape after a nearly 40 year absence. Since

The Importance of Deltaic Wetland Resources: A Perspective from the Nooksack River Delta, Washington State, USA

Abstract Recent models by Stanley and Warne (1997) and Nicholas (1998) emphasize the importance of deltas and wetland resources in foraging adaptation. Discussions of changing subsistence strategies

Influences of beaver (Castor canadensis) activity on ecology and fish assemblages of dryland streams

Overall, this study provides evidence that, relative to unimpounded stream habitat, beaver ponds in the Verde River basin support abundant smallbodied non-native fishes, which could have negative impacts on co-occurring native fish populations.

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



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

Beavers Are Partners in Riparian Restoration on the Zuni Indian Reservation

for rare birds. I n the semi-arid high desert of the Colorado Plateau, the Zuni Indians of New Mexico have long known the value of healthy riparian areas, lakes, wetlands, and springs. Aboriginal

The effects of beaver in riverbank forest succession

A major reduction in density is predicted for future populations of ash, hickory, and hackberry in areas of beaver activity, with a concomitant increase in the density of basswood and elm and possibly silver maple and prickly ash.

Waterfowl Utilization of Beaver Ponds in New Brunswick

Waterfowl utilization of 41 beaver ponds in south-central New BIunswick was studied during 1969, finding that brood cover was more abundant in active ponds and the active ponds were better brood-rearing areas.

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

Alteration of North American streams by beaver

Although once more prevalent than they are today, beaver-induced alterations to drainage networks are not localized or unusual and must be interpreted over broad spatial and temporal scales as beaver population dynamics shift in response to disturbance, food supply, disease, and predation.

Attitudes of Private- and Public-Land Managers in Wyoming, USA, Toward Beaver

Primary concerns about beaver damage centered on blocked irrigation ditches, girdled timber, blocked culverts, and flooded pastures, roads, crops, and timber, and primary benefits that landowners perceive that beaver give them were elevated water tables, increased riparian vegetation, and increased stock-watering opportunities.

Presettlement overharvest of upper Columbia River beaver populations

Beaver (Castor canadensis) populations of the Pacific Northwest interior underwent a drastic decline from 1835 to 1850, as evidenced by a steady decrease in harvest, but certain populations showed evidence of recovery beginning about 1850.

A Note on Trophic Complexity and Community Stability

  • R. Paine
  • Environmental Science
    The American Naturalist
  • 1969
The most workable definition involves statements about the relative variability of population numbers in space and/or time, although limits on the extent of the spatial dimension are not usually stated, and collections of acceptable data through time are tedious to gather, and hence minimal.