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| Tamiasciurus hudsonicus | |
|---|---|
| Name | American red squirrel |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Tamiasciurus |
| Species | hudsonicus |
| Authority | (Erxleben, 1777) |
Tamiasciurus hudsonicus is a small North American tree squirrel notable for its territoriality and conifer-seed caching. Native to boreal and temperate forests, it plays a role in seed dispersal and forest dynamics and has been the subject of studies by institutions such as the Smithsonian Institution, University of British Columbia, and University of Minnesota.
The species was described by Johann Christian Polycarp Erxleben and appears in classifications used by the International Union for Conservation of Nature and the American Society of Mammalogists, with genus Tamiasciurus placed in family Sciuridae and order Rodentia. Etymological discussion appears in works from the Linnean Society of London and historical catalogs at the Natural History Museum, London, tracing "Tamiasciurus" to Greek roots discussed in taxonomic monographs from the Royal Society and comparative treatments in the American Museum of Natural History. Subspecific delineations have been debated in phylogeographic studies published through collaborations among researchers at McGill University, University of Alaska Fairbanks, and the Canadian Museum of Nature.
Adults exhibit a rufous dorsal pelage with paler underparts and seasonal molt patterns documented in field guides by the Smithsonian Institution and the Royal Ontario Museum. Morphometrics reported in surveys by the United States Geological Survey and the Canadian Wildlife Service list body lengths and masses comparable to entries in the Handbook of Mammals of the World and regional faunal lists maintained by the National Park Service. Vocalizations and tail flicking described in behavioral studies at the Max Planck Institute and the Yale School of Forestry & Environmental Studies are used for territorial signaling similarly cataloged in archives at the British Trust for Ornithology.
The range extends across boreal and montane forests from the Atlantic provinces through central Canada into parts of the northern United States, with range maps appearing in assessments by the IUCN, the Canadian Wildlife Service, and state agencies such as the Minnesota Department of Natural Resources. Habitats include conifer-dominated stands managed by the US Forest Service, old-growth tracts protected by the National Park Service, and riparian corridors surveyed by the Canadian Parks and Wilderness Society. Biogeographic patterns have been analyzed in studies affiliated with the University of Washington, University of Montana, and the University of Toronto.
Territorial defense, vocal alarm calling, and midden maintenance have been detailed in long-term studies conducted by researchers at the University of British Columbia, the University of Alberta, and the University of New Brunswick, and summarized in reviews by the Ecological Society of America. Interactions with conifer species like Pinus strobus, Picea glauca, and Pseudotsuga menziesii affect seed dynamics noted in collaborative projects involving the Canadian Forest Service and the USDA Forest Service. Seasonal cycles influencing population density and community ecology have been modeled in papers associated with the National Science Foundation and the Natural Sciences and Engineering Research Council of Canada.
Primary diet centers on conifer seeds such as those from Picea mariana, Larix laricina, and Pinus contorta, with supplemental feeding on fungi, buds, and berries discussed in studies from the Royal Botanic Gardens, Kew and the Ontario Ministry of Natural Resources and Forestry. Hoarding behavior and cache retrieval have been experimentally examined by laboratories at the University of California, Berkeley, McMaster University, and the Max Planck Institute for Ornithology, linking foraging strategies to mast events documented by the Boreal Songbird Initiative and the Canadian Forest Service.
Breeding phenology, litter size, and juvenile dispersal have been recorded in field programs run by the Yale School of the Environment, the University of Minnesota, and provincial wildlife branches such as the British Columbia Ministry of Forests. Parental care, natal philopatry, and survivorship curves appear in demographic analyses published through the Journal of Mammalogy and collaborative research with the American Society of Mammalogists and the Royal Society Publishing.
Predation by raptors like Bubo virginianus and Accipiter gentilis, mesocarnivores such as Martes americana and Vulpes vulpes, and occasional take by mammals recorded in reports from the Canadian Wildlife Service and the US Fish and Wildlife Service affects population dynamics documented in studies at the University of Calgary and the Montana Fish, Wildlife & Parks. Parasitic and pathogenic challenges including ectoparasites and viral agents have been surveyed in veterinary investigations associated with the Centers for Disease Control and Prevention, the Canadian Food Inspection Agency, and academic pathology labs at the University of Wisconsin–Madison.
Category:Tamiasciurus Category:Squirrels of North America