نتایج جستجو برای: flying squirrels

تعداد نتایج: 11930  

2015
Caroline Millins Agnieszka Magierecka Lucy Gilbert Alissa Edoff Amelia Brereton Elizabeth Kilbride Matt Denwood Richard Birtles Roman Biek H. Goodrich-Blair

Invasive vertebrate species can act as hosts for endemic pathogens and may alter pathogen community composition and dynamics. For the zoonotic pathogen Borrelia burgdorferi sensu lato, the agent of Lyme borreliosis, recent work shows invasive rodent species can be of high epidemiological importance and may support host-specific strains. This study examined the role of gray squirrels (Sciurus ca...

Journal: :Journal of comparative psychology 2010
Jason N Bruck Jill M Mateo

The purpose of this investigation was to determine whether Belding's ground squirrels (Urocitellus beldingi) from areas rich in beacons perform differently in a task of spatial memory compared with squirrels from beacon-thin areas. To assess the role of environmental experience in spatial memory, wild-born squirrels with several days of experience in the field were compared with squirrels born ...

2015
Rebecca L. Minor John L. Koprowski Jian Liu

Competition for seeds has a major influence on the evolution of granivores and the plants on which they rely. The complexity of interactions and coevolutionary relationships vary across forest types. The introduction of non-native granivores has considerable potential to alter seed dispersal dynamics. Non-native species are a major cause of endangerment for native species, but the mechanisms ar...

Journal: :Illinois Natural History Survey Bulletin 1945

2016
Hsiang Ling Chen John L. Koprowski Francisco Moreira

Anthropogenic infrastructure such as roads and non-native species are major causes of species endangerment. Understanding animal behavioral responses to roads and traffic provides insight into causes and mechanisms of effects of linear development on wildlife and aids effective mitigation and conservation. We investigated effects of roads and traffic on space use and movements of two forest-dwe...

Journal: :Genes, brain, and behavior 2005
J M Barker J M Wojtowicz R Boonstra

Postnatal hippocampal neurogenesis in wild mammals may play an essential role in spatial memory. We compared two species that differ in their reliance on memory to locate stored food. Yellow-pine chipmunks use a single cache to store winter food; eastern gray squirrels use multiple storage sites. Gray squirrels had three times the density of proliferating cells in the dentate gyrus (determined ...

Journal: :The Journal of heredity 2014
Helen R McRobie Linda M King Cristina Fanutti Peter J Coussons Nancy D Moncrief Alison P M Thomas

Sequence variations in the melanocortin 1 receptor (MC1R) gene are associated with melanism in many different species of mammals, birds, and reptiles. The gray squirrel (Sciurus carolinensis), found in the British Isles, was introduced from North America in the late 19th century. Melanism in the British gray squirrel is associated with a 24-bp deletion in the MC1R. To investigate the origin of ...

Journal: :Applied and environmental microbiology 2001
E R Atwill S M Camargo R Phillips L H Alonso K W Tate W A Jensen J Bennet S Little T P Salmon

Sixteen percent of California ground squirrels (Spermophilus beecheyi) were found to be shedding an average of 53,875 Cryptosporidium parvum oocysts/g of feces. Male squirrels had a higher prevalence and higher intensity of shedding than did female squirrels. The majority of C. parvum isolates matched a bovine-murine genotype, with a few isolates resembling a porcine genotype. Higher intensitie...

2014
Pauline Priol Marc J Mazerolle Louis Imbeau Pierre Drapeau Caroline Trudeau Jessica Ramière

Dynamic N-mixture models have been recently developed to estimate demographic parameters of unmarked individuals while accounting for imperfect detection. We propose an application of the Dail and Madsen (2011: Biometrics, 67, 577-587) dynamic N-mixture model in a manipulative experiment using a before-after control-impact design (BACI). Specifically, we tested the hypothesis of cavity limitati...

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