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Relevant bibliographies by topics / North American Beaver

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Academic literature on the topic 'North American Beaver'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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Journal articles on the topic "North American Beaver"

1

Labrecque-Foy, Julie-Pascale, Hubert Morin, and Miguel Montoro Girona. "Dynamics of Territorial Occupation by North American Beavers in Canadian Boreal Forests: A Novel Dendroecological Approach." Forests 11, no. 2 (2020): 221. http://dx.doi.org/10.3390/f11020221.

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Research Highlights: Our study highlights a new, simple, and effective method for studying the habitat use by beavers in Canadian boreal forests. Information regarding the presence of beaver colonies and their habitat occupation is essential for proper forest management and damage prevention in the boreal forest. Background and Objectives: The North American beaver (Castor canadensis) is a major element of natural disturbance, altering the dynamics and structure of boreal forest landscapes. Beaver-related activities also affect human infrastructure, cause floods, and lead to important monetary losses for forestry industries. Our study aimed to determine the spatiotemporal patterns of beaver occupation of lodges over time. Materials and Methods: Using a dendroecological approach to date browsing activity, we studied the occupation of two lodges per water body for eight water bodies located in the boreal forest of Québec, Canada. Results: Three sites showed alternating patterns of lodge use (occupation) over time, three sites (37.5%) demonstrated no alternating patterns of use, and two sites (25%) presented unclear patterns of lodge use. Conclusions: Alternating patterns of lodge use can be linked to food depletion and the need to regenerate vegetation around lodges, while non-alternating patterns may be related to fluctuations in water levels, the specific shrub and tree species surrounding the lodges, the size of the beaver territory, and the number of lodges present on a water body.

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2

Naiman, Robert J., Carol A. Johnston, and James C. Kelley. "Alteration of North American Streams by Beaver." BioScience 38, no. 11 (1988): 753–62. http://dx.doi.org/10.2307/1310784.

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3

Jung, Thomas S., and Jennifer A. Staniforth. "Unusual Beaver, Castor canadensis, Dams in Central Yukon." Canadian Field-Naturalist 124, no. 3 (2010): 274. http://dx.doi.org/10.22621/cfn.v124i3.1090.

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North American Beavers (Castor canadensis) are remarkable for their ability to build dams and modify their habitat. Dams are typically made of the boles and branches of trees and large shrubs, and reinforced with mud and rocks. Here, we report two unusual Beaver dams in central Yukon, Canada, that are made primarily of medium-sized rocks. This observation points to the adaptability of Beavers in using available materials to build their dams.

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4

Gribb, William, and Henry Harlow. "A Survey of Beaver Location and Habitat to Model Their Distribution in Grand Teton National Park, Wyoming." UW National Parks Service Research Station Annual Reports 28 (January 1, 2004): 31–40. http://dx.doi.org/10.13001/uwnpsrc.2004.3567.

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A species that attracted a considerable amount of attention during the early years of American colonization and western exploration was the beaver (Castor canadensis). So important was this species that treaties between European countries specifically identified the trading of its furs (Long, 2000). It is estimated that over 60 million beavers were removed from the North American landscape between the early 1600s through the late 1800s (Long, 2000). By the beginning of the 1900s it is believed that only 10% of the pre-settlement population of beavers remained. Though not extinct, their numbers were radically reduced because of the fur trade and their "destructive" behavior of cutting trees and ponding water that interfered with America's growth. This perception of their detriment to the environment has been dramatically changed, and they are now perceived as ecosystem engineers that assist in creating beneficial habitat and restoring damaged landscapes (Naiman et al., 1988). Thus, it is essential in this revised role, that we know the distribution of the beaver, their habitats, and to determine the best management practices to utilize their benefits to the ecosystem.

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5

Jung, Thomas S., Jay Frandsen, Danny C. Gordon, and David H. Mossop. "Colonization of the Beaufort Coastal Plain by Beaver (Castor canadensis): A Response to Shrubification of the Tundra?" Canadian Field-Naturalist 130, no. 4 (2017): 332. http://dx.doi.org/10.22621/cfn.v130i4.1927.

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A consequence of rapid global warming has been the shrubification (increase in shrub abundance, cover, and biomass) of arctic and alpine tundra ecosystems. Shrubification is likely a key driver of predicted and observed changes in the biodiversity of the Arctic. The American Beaver (Castor canadensis) has a vast distributional range, covering most of north America below the tree line; however, it has not been recorded in tundra habitat of the Beaufort Coastal Plain of Yukon and Alaska. in 2015, we observed a beaver dam, lodge, and winter food cache on the Babbage River in Ivvavik National Park, Yukon, Canada. Local Inuvialuit hunters first observed beavers on two rivers immediately east of the Babbage River in 2008 and 2009. Together, these are the first observations of beavers on the Beaufort Coastal Plain and indicate initial attempts at colonization. Colonization of the Beaufort Coastal Plain by beavers may have been facilitated by shrubification of river valleys on the tundra of northern Yukon and adjacent Alaska, which is a consequence of rapid climate warming in the western Arctic.

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6

WILLIAMS, MARTYN. "Beaver Country: a North American beaver: Castor canadensis exhibit at Drusillas Zoo Park." International Zoo Yearbook 29, no. 1 (1989): 221–24. http://dx.doi.org/10.1111/j.1748-1090.1989.tb01118.x.

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7

WILLIAMS, MARTYN. "Beaver Country: a North American beaver: Castor canadensis exhibit at Drusillas Zoo Park." International Zoo Yearbook 29, no. 1 (2007): 221–24. http://dx.doi.org/10.1111/j.1748-1090.1990.tb03357.x.

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8

Vispo, Conrad, and Ian D. Hume. "The digestive tract and digestive function in the North American porcupine and beaver." Canadian Journal of Zoology 73, no. 5 (1995): 967–74. http://dx.doi.org/10.1139/z95-113.

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The morphology and function of the digestive tract of the largely arboreal porcupine (Erethizon dorsatum) and the semiaquatic beaver (Castor canadensis) were compared in relation to the similarly woody winter diet of these animals. Digesta particle sizes and Ca concentrations were consistently greater along the digestive tract of the beaver than along that of the porcupine. The small intestine of the beaver is 70% longer than that of the porcupine (P < 0.05 by ANCOVA). Both rodents are hind-gut fermenters and there was selective retention of small digesta particles (< 45 μm) in the cecum of both species. Hind-gut fermentation is confined to the cecum in the porcupine, but in the beaver the cecum and proximal colon function together as a fermentation chamber; the two anatomies appear to yield similar amounts of energy from the volatile fatty acids produced by fermentation, equivalent to 18–19% of the basal metabolic rate. A longer distal colon in the porcupine (P < 0.01 by ANCOVA) is related to greater resorption of water than in the beaver; dry matter content of the digesta increased from 13% in the cecum to 40% in the distal colon of the porcupine (P < 0.001 by ANOVA), but only from 20 to 33% in the beaver (P < 0.01 by ANOVA). High levels of Na accumulate in the porcupine cecum, presumably as a result of effective Na-conservation mechanisms.

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9

Ward, O. G., A. S. Graphodatsky, D. H. Wurster-Hill, V. R. Eremina, J. P. Park, and Q. Yu. "Cytogenetics of beavers: a case of speciation by monobrachial centric fusions." Genome 34, no. 3 (1991): 324–28. http://dx.doi.org/10.1139/g91-053.

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A comparison of G-banded chromosomes of four North American beavers, Castor canadensis (two males, two females), and four Eurasian beavers, Castor fiber (two males, two females), revealed that extensive monobrachial centric fusions distinguished the karyotypes of the two species. The complex multivalent formations that would occur in meiosis of a hypothetical hybrid would be expected to produce unbalanced gametes and postmating reproductive isolation. Thus, neither species was derived from the other; rather, they likely were derived from isolated populations in which some of the acrocentrics fused independently to produce monobrachial homology.Key words: beaver, chromosomes, karyotype evolution, monobrachial rearrangements, reproductive isolation.

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10

Marymor, Leigh, and Richard Burnham Lanman. "Western Message Petroglyphs indicate historic beaver presence in a San Francisco Bay Area watershed." California Fish and Wildlife Journal 107, no. 2 (2021): 89–98. http://dx.doi.org/10.51492/cfwj.107.8.

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Recent museum, archaeological, and observer record evidence suggests that North American beaver (Castor canadensis) were historically native to the watersheds of California’s coast, including San Francisco Bay. A wide variety of animals are abundantly represented in Native American petroglyphs and pictographs with their representations fulfilling intentions ranging from the mundane to ceremonial and mythological purposes. However, beaver symbols are poorly represented in California rock art and absent from the San Francisco Bay Area. A novel record, in the form of Western Message Petroglyphs, suggests that a beaver lodge was present in the late nineteenth century in the Alameda Creek watershed, potentially the last evidence of beaver prior to their extirpation in the region by the fur trade.

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