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14 results for “Tamiasciurus”
MRI and unbiased averages of wild muskrats (Ondatra zibethicus) and red squirrels (Tamiasciurus hudsonicus)
<p>Preprocessed data from:</p> <p>Amuno, S., Rudko, D.A., Gallino, D., Tuznik, M., Shekh, K., Kodzhahinchev, V., Niyogi, S., Chakravarty, M.M., Devenyi, G.A., 2020. Altered neurotransmission and neuroimaging biomarkers of chronic arsenic poisoning in wild muskrats (Ondatra zibethicus) and red squirrels (Tamiasciurus hudsonicus) breeding near the City of Yellowknife, Northwest Territories (Canada). Sci. Total Environ. 707, 135556. https://doi.org/10.1016/j.scitotenv.2019.135556</p> <p> </p> <p>As well as averages and brain masks generated during DBM processing. Files in both MINC2 and NIFTI format.</p>
Reproductive state alters vocal characteristics of female North American red squirrels (Tamiasciurus hudsonicus)
<p>Female advertisement of reproductive state and receptivity has the potential to play a large role in the mating systems of many taxa, but investigations of this phenomenon are underrepresented in the literature. North American red squirrels (<em>Tamiasciurus hudsonicus</em>) are highly territorial and engage in scramble competition mating, with males converging from spatially disparate territories to engage in mating chases. Given the narrow estrus window exhibited in this species, the ubiquitous use of vocalizations to advertise territory ownership, and the high synchronicity of males arriving from distant territories, we hypothesized that female vocalizations contain cues relating to their estrous state. To test this hypothesis, we examined the spectral and temporal properties of female territorial rattle vocalizations collected from females of known reproductive condition over 3 years. While we found no distinct changes associated with estrus specifically, we did identify significant changes in the spectral characteristics of rattles relating to both female body mass and reproductive state relative to parturition. To the best of our knowledge, this is the first evidence of changes in vocal characteristics associated with late pregnancy in a non-human mammal.</p>
Reproductive state alters vocal characteristics of female North American red squirrels (Tamiasciurus hudsonicus)
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On following pages: 75. Fremont's Squirrel (Tamiasciurus fremonti); 76. Eurasian Red Squirrel (Sciurus vulgaris); 77 carolinensis); 80. Eastern Fox Squirrel (Sciurus nigen; 81. Western Gray Squirrel (Sciurus griseus); 82. Abert's Squirrel. Japanese Squirrel (Sciurus lis); 78. Caucasian Squirrel (Sciurus anomalus); 79. Eastern Gray Squirrel (Sciurus (Sciurus aberti); 83. Arizona Gray Squirrel (Sciurus arizonensis). in Sciuridae
On following pages: 75. Fremont's Squirrel (Tamiasciurus fremonti); 76. Eurasian Red Squirrel (Sciurus vulgaris); 77 carolinensis); 80. Eastern Fox Squirrel (Sciurus nigen; 81. Western Gray Squirrel (Sciurus griseus); 82. Abert's Squirrel. Japanese Squirrel (Sciurus lis); 78. Caucasian Squirrel (Sciurus anomalus); 79. Eastern Gray Squirrel (Sciurus (Sciurus aberti); 83. Arizona Gray Squirrel (Sciurus arizonensis).
Fig. 1 in Tamiasciurus mearnsi (Rodentia: Sciuridae)
Fig. 1.—An adult female Tamiasciurus mearnsi from the Sierra de San Pedro Mártir, Baja California, Mexico. Photograph taken at Vallecitos on 10 August 2005 by N. Ramos-Lara.
Fig. 6.—A in Tamiasciurus mearnsi (Rodentia: Sciuridae)
Fig. 6.—A subadult Tamiasciurus mearnsi feeding on a Jeffrey pine (Pinus jeffreyi) cone in the Sierra de San Pedro Mártir, Baja California, Mexico. Photograph taken at Vallecitos on 15 July 2005 by N. Ramos-Lara.
Fig. 4.—A in Tamiasciurus mearnsi (Rodentia: Sciuridae)
Fig. 4.—A litter of 5 Tamiasciurus mearnsi placed on the ground by their mother during a move to a new cavity nest in the Sierra de San Pedro Mártir, Baja California, Mexico. Photograph taken at Vallecitos on 25 May 2006 by N. Ramos-Lara.
Fig. 5 in Tamiasciurus mearnsi (Rodentia: Sciuridae)
Fig. 5.—Open conifer-dominated forest habitat of Tamiasciurus mearnsi in the Sierra de San Pedro Mártir, Baja California, Mexico. Photograph taken at Vallecitos on 9 May 2008 by N. Ramos-Lara.
Fig. 2 in Tamiasciurus mearnsi (Rodentia: Sciuridae)
Fig. 2.—Dorsal, ventral, and lateral views of skull and lateral view of mandible of an adult female Tamiasciurus mearnsi (The Field Museum of Natural History [FMNH] #10576) from Vallecitos, Sierra de San Pedro Mártir, Baja California, Mexico. Photographs taken by B. Patterson used with permission. Greatest length of skull is 51.1 mm.
Craniodental divergence associated with bite force between hybridizing pine squirrels (Tamiasciurus)
<p>Bite force can be a limiting factor in foraging and can significantly affect the competitive ability and lifetime fitness of mammals. <em>Tamiasciurus</em> squirrels feed primarily on conifer seeds and have a strong bite force to mechanically extract seeds from conifer cones with their mouths. In the North Cascades region, Douglas squirrels (<em>Tamiasciurus</em> <em>douglasii</em>) and red squirrels (<em>T</em>. <em>hudsonicus</em>) occupy ecologically different forests with different hardnesses in conifer cones. The ranges of these species overlap in a narrow hybrid zone where these forests meet near the crest of the North Cascades. We examined interspecific divergence in dietary ecomorphology in allopatry, in sympatry within the hybrid zone, and between hybrids and each parental species. We focused on three craniodental traits, including the incisor-strength index as a proxy measure for maximal bite force, cranial-suture complexity, and mandible shape. We find that these sister squirrel species differ in bite force and suture complexity in allopatry and sympatry and that mandible shape changes with the expected hardness of accessed food items, but is not significantly different between species. Furthermore, we find that hybrids display morphologies that overlap with hybrid zone red squirrels but not with hybrid zone Douglas squirrels. This work shows how important ecological processes at shallow evolutionary timescales can impact the divergence of morphological traits in taxa with extreme conservation of craniomandibular shape.</p>
Data from: Genetic and phenotypic variation across a hybrid zone between ecologically divergent tree squirrels (Tamiasciurus)
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Data from: Diversification and gene flow in nascent lineages of island and mainland North American tree squirrels (Tamiasciurus)
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Craniodental divergence associated with bite force between hybridizing pine squirrels (Tamiasciurus)
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Fig. 3 in Tamiasciurus mearnsi (Rodentia: Sciuridae)
Fig. 3.—Geographic distribution of Tamiasciurus mearnsi. Created by M. J. Merrick.
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International Brain Laboratory public data
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OpenNeuro
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