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78 results for “Sciurus”
Figure 4 in Phylogeography of the Eurasian red squirrel (Sciurus vulgaris orientis) on the boreal island of Hokkaido, Japan
Figure 4. Network of the 29 cytochrome b gene haplotypes of Sciurus vulgaris orientis in Hokkaido Island, Japan, using statistical parsimony. Haplotype names correspond to Appendix 1. Missing haplotypes are indicated by open circles. Lines connecting haplotypes indicate the relationship. Numbers in parentheses indicate the number of individuals. Haplotypes without parentheses are from just one individual.
Figure 5 in Phylogeography of the Eurasian red squirrel (Sciurus vulgaris orientis) on the boreal island of Hokkaido, Japan
Figure 5. Observed (solid lines with solid diamonds) and expected (dotted lines with open squares) mismatch distributions of Sciurus vulgaris orientis haplotypes: A) northern population; B) southern population; C) over all of Hokkaido population.
Figure 3 in Phylogeography of the Eurasian red squirrel (Sciurus vulgaris orientis) on the boreal island of Hokkaido, Japan
Figure 3. Phylogeny of Sciurus vulgaris constructed with the Bayesian inference (BI) under a HKY + G model for the cytochrome b sequences. Numbers above branches represent posterior probability supports in Bayesian analysis followed by bootstrap values from 300 replicates of ML analysis. Hyphens mean no data because clades were absent. Symbols indicate phylogroups, and correspond to those in Figure 2.
Figure 1 in Coccidian parasites of red squirrels (Sciurus vulgaris) and grey squirrels (Sciurus carolinensis) in England
Figure 1. Outline map of England indicating collection sites. 1. Isle of Wight; 2. Fursey Island; 3. Epping Forest; 4. Thetford Chase; 5. Formby; 6. Cumbria.
Daily Activity and Nest Occupation Patterns of Fox Squirrels (Sciurus niger) Throughout the Year
<p>The daily distribution of activity has been studied in detail in ground squirrels in the field as well as in the laboratory, but studies of tree squirrels have been few and generally limited to the sampling of behavior of groups of animals. In this study, the authors investigated the general activity and nest occupation patterns of fox squirrels in a natural setting using temperature-sensitive data loggers that measure activity as changes in the microenvironment of the animal. Data were obtained from 25 distinct preparations, upon 13 unique squirrels, totaling 1385 recording days. Fox squirrels exhibited robust daily rhythmicity of locomotor activity, comparable to that of laboratory rats and gerbils. The animals were clearly diurnal, with a predominantly unimodal activity pattern, although individual squirrels occasionally exhibited bimodal patterns, particularly in the spring and summer. Even during the short days of winter (9 hours), the squirrels typically left the nest after dawn and returned before dusk, spending only about 7 hours out of the nest each day. Although the duration of the daily active phase did not change with the seasons, the squirrels exited the nest earlier in the day when the days became longer in the summer and exited the nest later in the day when the days became shorter in the winter, thus tracking dawn along the seasons. During the few hours each day spent outside the nest, fox squirrels seemed to spend most of the time sitting or lying. These findings suggest that fox squirrels may have adopted a slow life history strategy.</p>
Sciurus carolinensis (Sciuridae) - whole organism
Image of Sciurus carolinensis (Sciuridae) - whole organism
Sciurus carolinensis (Sciuridae) - whole organism
Image of Sciurus carolinensis (Sciuridae) - whole organism
Sciurus carolinensis (Sciuridae) - whole organism
Image of Sciurus carolinensis (Sciuridae) - whole organism
Fig. 2 in A review of Sciurus Group studies on the red squirrel (Sciurus vulgaris): presence, population density and colour phases in Lombardy (Italy)
Fig. 2 - Fur colour polymorphism in Sciurus vulgaris. Collection of the Museum of Natural History of Milan MSNM. (Photo by Carlo Biancardi).
Fig. 1 - A in A review of Sciurus Group studies on the red squirrel (Sciurus vulgaris): presence, population density and colour phases in Lombardy (Italy)
Fig. 1 - A moment of the fieldwork in Luinese. From the left: Gianni Schiroli, Andrea Viganò, Luigi Cagnolaro e Laura Rinetti. (Photo by Carlo Biancardi).
Fig. 4 in A review of Sciurus Group studies on the red squirrel (Sciurus vulgaris): presence, population density and colour phases in Lombardy (Italy)
Fig. 4 - Observations of red and dark phases per altitudinal range. The dark phase became prevalent, with respect to the mean colour phase ratio, above 800 m a.s.l.
Fig. 2 in Pathologic findings in Western gray squirrels (Sciurus griseus) from a notoedric mange epidemic in the San Bernardino Mountains, California
Fig. 2. Histologic section of skin of a free-ranging western gray squirrel (Sciurus griseus) with notoedric mange. (a) Intraepidermal tunnels containing numerous mites [arrows]. H&E stain. Bar = 500 µm. [Brace = epidermis; star = dermis.] (b) High magnification demonstrating intralesional mites [arrows] and small numbers of round to oval eggs [arrowheads]. H&E stain. Bar = 100 µm.
Fig. 1 in Pathologic findings in Western gray squirrels (Sciurus griseus) from a notoedric mange epidemic in the San Bernardino Mountains, California
Fig. 1. (a). Histologic sections of skin of free-ranging Western gray squirrels (Sciurus griseus). (a) Severe notoedric mange characterized by, irregular acanthosis with rete ridge formation, extensive orthokeratotic and parakeratotic hyperkeratosis with serocellular crusting, intracorneal pustules, and numerous variably-sized, intracorneal and intraepidermal tunnels. H&E stain. Bar = 1000 µm. (b) Unaffected skin for comparison. H & E stain. Bar = 500 µm. [Brace = epidermis; star = dermis.]
Fig. 4 in Sciurus pucheranii (Rodentia: Sciuridae)
Fig. 4.—Lateral view of a baculum of Sciurus pucheranii from Acevedo, Huila, Colombia (drawing modified from Didier [1955]).
Fig. 2 in Sciurus pucheranii (Rodentia: Sciuridae)
Fig. 2.—Dorsal, ventral, and lateral views of skull and lateral view of mandible of Sciurus pucheranii (female from Huila, Colombia; The Field Museum, Chicago, Illinois; specimen 71113). Greatest length of skull is 42.6 mm. Photographs provided by B. Patterson.
Fig. 4 in Sciurus ignitus (Rodentia: Sciuridae)
Fig. 4.—Geographic distribution of Sciurus ignitus in South America. Subspecies are: 1, S. i. argentinius; 2, S. i. boliviensis; 3, S. i. cabrerai; 4, S. i. ignitus; 5, S. i. irroratus. Map created with range of S. ignitus (Patterson et al. 2007) with modifications from Bonvicino et al. (2008) and Thorington et al. (2012).
Fig. 3 in Sciurus ignitus (Rodentia: Sciuridae)
Fig. 3.—Dorsal, ventral, and lateral views of skull and lateral view of mandible of Sciurus ignitus (Field Museum of Natural History [FMNH] 46099, female collected on 20 June 1927 by F. B. Steinbach), from Chapare, Cochabamba, Bolivia, 2,000 m above sea level. Greatest length of skull is 50 mm. Photographs by B. D. Patterson used with permission.
Fig. 2 in Sciurus ignitus (Rodentia: Sciuridae)
Fig. 2.—Subadult Sciurus ignitus taken at Hotel Esmeralda, Coroico, Bolivia (16811 021 00S, 67843011 00 W, altitude: 1,660 m above sea level), October 2012. Photograph by Clayton Burne used with permission.
Fig. 2 in Sciurus pyrrhinus (Rodentia: Sciuridae)
Fig. 2.—Dorsal, ventral, and lateral views of skull and lateral view of mandible of an adult female Sciurus pyrrhinus (Field Museum of Natural History [FMNH] 24106) from Oxapampa, Pasco, Peru. Greatest length of skull is 57.7 mm. Photographs taken by B. D. Patterson used with permission.
Fig. 3 in Sciurus pyrrhinus (Rodentia: Sciuridae)
Fig. 3.—Geographic distribution of Sciurus pyrrhinus modified from Thorington et al. (2012). Potential range extension to the east without voucher specimens is denoted by a question mark (?), and to the north into Ecuador from a specimen collected at the location denoted by a circle. Map created by M. J. Merrick.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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