Comparative Morphological Study on the Stereo-Structure of the Lingual Papillae and Their Connective Tissue Cores of the American Beaver (Castor Canadensis)

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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Invasion of North American beaver (Castor canadensis) in the province of Magallanes, Southern Chile: comparison between dating sites through interviews with the local community and dendrochronology

Revista chilena de historia natural ◽

10.1186/s40693-015-0034-6 ◽

2015 ◽

Vol 88 (1) ◽

Cited By ~ 6

Author(s):

Giorgia Graells ◽

Derek Corcoran ◽

Juan Carlos Aravena

Keyword(s):

North American ◽

Local Community ◽

Castor Canadensis ◽

Southern Chile ◽

American Beaver

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Eastern Coyotes (Canis latrans var.) consuming large ungulates in a multi-ungulate system

The Canadian Field-Naturalist ◽

10.22621/cfn.v134i1.2149 ◽

2020 ◽

Vol 134 (1) ◽

pp. 45-51

Author(s):

Juliana Balluffi-Fry ◽

Liane B. Nowell ◽

Murray M. Humphries

Keyword(s):

Prey Species ◽

Canis Latrans ◽

Feeding Habits ◽

Castor Canadensis ◽

Generalist Predators ◽

Generalist Predator ◽

Wide Range ◽

Game Reserve ◽

Varied Diet ◽

American Beaver

The feeding habits of generalist predators often vary among populations and regions. For example, Coyote (Canis latrans), which is a generalist predator distributed across North America, occupies a wide range of habitats and has a highly varied diet. In this observational study, we quantified the presence of mammalian prey items in 50 Eastern Coyote (Canis latrans var.) scats collected in late spring and summer in a private game reserve in southwestern Quebec. Nearly all scats contained hair of White-tailed Deer (Odocoileus virginianus; 44%), Moose (Alces americanus; 38%), or American Beaver (Castor canadensis; 38%). Although all three species are known to be consumed by coyotes, such a high proportion of Moose and White-tailed Deer simultaneously occurring in the diet of coyotes has not been previously reported. The uniqueness of the study area, with its relatively high abundance of all three prey species, may account for the uniqueness of the diet of Eastern Coyotes living there.

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