NOTOEDRIC MANGE IN GRAY SQUIRRELS (SCIURUS CAROLINENSIS)

1982 ◽  
Vol 18 (3) ◽  
pp. 347-348 ◽  
Author(s):  
BRENT L. CARLSON ◽  
DANIEL P. ROHER ◽  
SVEND W. NIELSEN
Keyword(s):  
Sciurus Carolinensis ◽  
Notoedric Mange

scholarly journals Novel combination of CRISPR-based gene drives eliminates resistance and localises spread

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nicky R. Faber ◽  
Gus R. McFarlane ◽  
R. Chris Gaynor ◽  
Ivan Pocrnic ◽  
C. Bruce A. Whitelaw ◽  
...  
Keyword(s):  
Driving Forces ◽  
Spatial Models ◽  
Cost Effective ◽  
Biodiversity Loss ◽  
Invasive Pest ◽  
Economic Losses ◽  
Sciurus Carolinensis ◽  
Gene Drive ◽  
Grey Squirrel ◽  
Gene Drives

AbstractInvasive species are among the major driving forces behind biodiversity loss. Gene drive technology may offer a humane, efficient and cost-effective method of control. For safe and effective deployment it is vital that a gene drive is both self-limiting and can overcome evolutionary resistance. We present HD-ClvR in this modelling study, a novel combination of CRISPR-based gene drives that eliminates resistance and localises spread. As a case study, we model HD-ClvR in the grey squirrel (Sciurus carolinensis), which is an invasive pest in the UK and responsible for both biodiversity and economic losses. HD-ClvR combats resistance allele formation by combining a homing gene drive with a cleave-and-rescue gene drive. The inclusion of a self-limiting daisyfield gene drive allows for controllable localisation based on animal supplementation. We use both randomly mating and spatial models to simulate this strategy. Our findings show that HD-ClvR could effectively control a targeted grey squirrel population, with little risk to other populations. HD-ClvR offers an efficient, self-limiting and controllable gene drive for managing invasive pests.

scholarly journals The Molecular Genetics and Evolution of Red and Green Color Vision in Vertebrates

Genetics ◽  
2001 ◽  
Vol 158 (4) ◽  
pp. 1697-1710 ◽  
Author(s):  
Shozo Yokoyama ◽  
F Bernhard Radlwimmer
Keyword(s):  
Color Vision ◽  
Homo Sapiens ◽  
Amino Acid Sequences ◽  
Capra Hircus ◽  
Sciurus Carolinensis ◽  
Cave Fish ◽  
Vitro Assay ◽  
Green Color ◽  
Astyanax Fasciatus

Abstract To better understand the evolution of red-green color vision in vertebrates, we inferred the amino acid sequences of the ancestral pigments of 11 selected visual pigments: the LWS pigments of cave fish (Astyanax fasciatus), frog (Xenopus laevis), chicken (Gallus gallus), chameleon (Anolis carolinensis), goat (Capra hircus), and human (Homo sapiens); and the MWS pigments of cave fish, gecko (Gekko gekko), mouse (Mus musculus), squirrel (Sciurus carolinensis), and human. We constructed these ancestral pigments by introducing the necessary mutations into contemporary pigments and evaluated their absorption spectra using an in vitro assay. The results show that the common ancestor of vertebrates and most other ancestors had LWS pigments. Multiple regression analyses of ancestral and contemporary MWS and LWS pigments show that single mutations S180A, H197Y, Y277F, T285A, A308S, and double mutations S180A/H197Y shift the λmax of the pigments by −7, −28, −8, −15, −27, and 11 nm, respectively. It is most likely that this “five-sites” rule is the molecular basis of spectral tuning in the MWS and LWS pigments during vertebrate evolution.

scholarly journals Caching and Feeding Decisions by Sciurus carolinensis: Responses to Weevil-Infested Acorns

1996 ◽  
Vol 77 (2) ◽  
pp. 305-314 ◽  
Author(s):  
M. A. Steele ◽  
L. Z. Hadj-Chikh ◽  
J. Hazeltine
Keyword(s):  
Sciurus Carolinensis

Optic nerve head morphology of the Eastern gray squirrel, Sciurus carolinensis

2004 ◽  
Vol 7 (3) ◽  
pp. 169-173
Author(s):  
Lindsay A. Kuester ◽  
Andras M. Komaromy ◽  
Dennis E. Brooks ◽  
Patricia A. Lewis ◽  
Fred Bennett ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Optic Nerve Head ◽  
Sciurus Carolinensis ◽  
Gray Squirrel ◽  
Head Morphology ◽  
Eastern Gray Squirrel

STUDIES ON THE BIOLOGY OF TAENIA CRASSICEPS (ZEDER, 1800) RUDOLPHI, 1810 (CESTODA)

1962 ◽  
Vol 40 (6) ◽  
pp. 969-990 ◽  
Author(s):  
Reino S. Freeman
Keyword(s):  
Initial Rate ◽  
Subsequent Development ◽  
Microtus Pennsylvanicus ◽  
Tamiasciurus Hudsonicus ◽  
Sciurus Carolinensis ◽  
New Host ◽  
Tamias Striatus ◽  
Taenia Crassiceps ◽  
Marmota Monax ◽  
New Host Records

Taenia crassiceps was common in Vulpes fulva examined from southern Ontario. Metacestodes occurred naturally in Microtus pennsylvanicus, Marmota monax, Tamias striatus, and Ondatra zibethicus, and Peromyscus maniculatus, Tamiasciurus hudsonicus, and Sciurus carolinensis were infected experimentally; all rodents are new host records. Cysticerci developed into adults in dogs or foxes within 5 to 6 weeks; five coyote pups resisted infection. Development of the metacestode was followed mainly in white mice. Infections were most common subcutaneously, but also occurred in both body cavities. Mice approximately 4 weeks of age were most susceptible. Asexual reproduction occurred by exogenous, and rarely endogenous, budding from the abscolex pole beginning approximately 3 weeks after infection. Metacestodes in various stages of development were injected into mice subcutaneously, intrapleurally, but mainly intraperitoneally. Subsequent development and reproduction were similar to that following infection with eggs. Apparently all metacestodes are capable of budding. The initial rate of reproduction was higher subcutaneously and intrapleurally than intraperitoneally, but within approximately 100 days the rate became higher and continued higher intraperitoneally than elsewhere. Reproduction never reached a logarithmic rate. Metacestodes inoculated serially up to 21 times at 50-day intervals increased greatly in size and continued budding. Four other series were maintained by serial subinoculation at 50-day intervals through 23 generations without a significant change in the rate of reproduction.

scholarly journals The genome sequence of the eastern grey squirrel, Sciurus carolinensis Gmelin, 1788

2020 ◽  
Vol 5 ◽  
pp. 27
Author(s):  
Dan Mead ◽  
Kathryn Fingland ◽  
Rachel Cripps ◽  
Roberto Portela Miguez ◽  
Michelle Smith ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Sex Chromosomes ◽  
Genome Assembly ◽  
Sciurus Carolinensis ◽  
Grey Squirrel ◽  
Individual Male ◽  
A Genome

We present a genome assembly from an individual male Sciurus carolinensis (the eastern grey squirrel; Vertebrata; Mammalia; Eutheria; Rodentia; Sciuridae). The genome sequence is 2.82 gigabases in span. The majority of the assembly (92.3%) is scaffolded into 21 chromosomal-level scaffolds, with both X and Y sex chromosomes assembled.

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