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388 results for “Squirrels”
Fig. 2 in Testing the parasite-mediated competition hypothesis between sympatric northern and southern flying squirrels
Fig. 2. Body condition of A) southern flying squirrels (n = 41), B) grey squirrels (n = 42), C) northern flying squirrels (n = 17), and D) red squirrels (n = 13) infested with Strongyloides robustus compared to those not infested. Body condition was calculated for squirrels captured near Peterborough, Ontario between June–September 2019.
Fig. 1 in Spillover and spillback risks of ectoparasites by an invasive squirrel Callosciurus erythraeus in Kanto region of Japan
Fig. 1. Location map of the study areas. The Pallas's squirrels examined in this study were collected by extermination programs operated by the local governments of Yokohama and Yokosuka. Detailed information on the sampling localities is refrained due to the intension of the cooperative organizations.
Fig. 3. NMDS plot for the parasite infracommunity composition recovered from 52 in Spillover and spillback risks of ectoparasites by an invasive squirrel Callosciurus erythraeus in Kanto region of Japan
Fig. 3. NMDS plot for the parasite infracommunity composition recovered from 52 host individuals. The influence of each parasite's abundance by discriminating the developmental stage on the score components of the two axes is represented by broken lines. The relationships with environmental variables are indicated by gray arrows. Abbreviations are as follows: M: male, F: female, YH: Yokohama, YS: Yokosuka, HfN: nymph of Haemaphysalis flava, HfL: larva of H. flava, Lep: larva of Leptotrombidium spp., EkA: adult of Enderleinellus kumadai, EkL: larva of E. kumadai, NoA: adult of Neohaematopinus callosciuri, NoL: larva of N. callosciuri, Ca: Ceratophyllus anisus, Ci: Ceratophyllus indages indages.
Fig. 3 in Testing the parasite-mediated competition hypothesis between sympatric northern and southern flying squirrels
Fig. 3. Ordination biplots for presence of squirrel species at woodlots based on live-trapping surveys conducted near Peterborough, Ontario during the summer of 2019. Biplots show A) the species and habitat matrices, B) the species and parasite matrices, and C) the species and spatial matrices.
Linked collectors and determiners for: The Scottish Squirrel Database.
Natural history specimen data linked to collectors and determiners held within, "The Scottish Squirrel Database". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/2e3454ce-5b2d-4bf4-bc23-ca5769f58137">https://bionomia.net/dataset/2e3454ce-5b2d-4bf4-bc23-ca5769f58137</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/2e3454ce-5b2d-4bf4-bc23-ca5769f58137">https://gbif.org/dataset/2e3454ce-5b2d-4bf4-bc23-ca5769f58137</a>. Formatted as a Frictionless Data package.
The role of neutral and adaptive genomic variation in population diversification and speciation in two ground squirrel species of conservation concern
<p>Understanding the neutral (demographic) and adaptive processes leading to the differentiation of species and populations is a critical component of evolutionary and conservation biology. In this context, recently diverged taxa represent a unique opportunity to study the process of genetic differentiation. Northern and southern Idaho ground squirrels (Urocitellus brunneus – NIDGS, and U. endemicus - SIDGS, respectively) are a recently diverged pair of sister species that have undergone dramatic declines in the last 50 years and are currently found in metapopulations across restricted spatial areas with distinct environmental pressures. Here we genotyped single-nucleotide polymorphisms (SNPs) from buccal swabs with restriction site-associated DNA sequencing (RADseq). With these data we evaluated neutral genetic structure at both the inter- and intraspecific level, and identified putatively adaptive SNPs using population structure outlier detection and genotype-environment association (GEA) analyses. At the interspecific level, we detected a clear separation between NIDGS and SIDGS, and evidence for adaptive differentiation putatively linked to torpor patterns. At the intraspecific level, we found evidence of both neutral and adaptive differentiation. For NIDGS, elevation appears to be the main driver of adaptive differentiation, while neutral variation patterns match and expand information on the low connectivity between some populations identified in previous studies using microsatellite markers. For SIDGS, neutral substructure generally reflected natural geographic barriers, while adaptive variation reflected differences in land cover and temperature, as well as elevation. These results clearly highlight the roles of neutral and adaptive processes for understanding the complexity of the processes leading to species and population differentiation, which can have important conservation implications in susceptible and threatened species.</p>
Text-fig. 4. Tooth replacement by the barbary ground squirrel (Atlantoxerus getulus). a – right maxillary with DP3–M3 (MNCN- 5522) showing the relative position of the two deciduous teeth; b – right maxillary with P3–M3 (MNCN-5538) showing the replacement of the DP4 by the P4 (not erupted). Blue: DP4; green: P4; yellow DP3; red: P3. in Dental Anomaly In A Middle Miocene Fossil Of The Genus Spermophilinus (Rodentia, Sciuridae) From Southern Germany
Text-fig. 4. Tooth replacement by the barbary ground squirrel (Atlantoxerus getulus). a – right maxillary with DP3–M3 (MNCN- 5522) showing the relative position of the two deciduous teeth; b – right maxillary with P3–M3 (MNCN-5538) showing the replacement of the DP4 by the P4 (not erupted). Blue: DP4; green: P4; yellow DP3; red: P3.
Ogham Stone Maps: Squirrel Stones in Ireland
<p>Ogham Stone Maps: Squirrel Stones in Ireland</p> <blockquote> <p>Mapping of Squirrel Stones (Q106602643) aggregated to the administrative level of counties and baronies, created with QGIS from the attached GeoJSON files and the baselayer Esri.WorldShadedRelief (Tiles © Esri - Source: Esri), EPSG:3857 (as of 01/17/2023).</p> </blockquote>
Data from: Beaver activity and red squirrel presence predict bird assemblages in boreal Canada
<p class="MsoNormal">Wetlands and predation in boreal ecosystems play essential roles throughout the breeding season for bird assemblages. We found a positive association of beaver activity and a negative influence of American red squirrels (<em>Tamiasciurus hudsonicus</em>) on bird assemblages. We used a multispecies hierarchical model to investigate whether bird communities differ between two major wetland habitats in boreal Canada: beaver ponds and peatland ponds. In addition to including variables such as forest cover and latitude, we adopted a structural equation model approach to estimate the occupancy of American red squirrels and its potential influence on bird communities. Using automated recording stations deployed at 50 ponds, we detected 96 bird species in 2018 and 2019. Bird species were grouped into four taxonomic guilds according to their habitat successional requirements: early successional species, late successional species, generalists, and wetland species. Beaver ponds harbored higher species richness, a pattern driven primarily by early successional species. The occupancy of almost a quarter of the species was lower in the presence of red squirrels. Late successional species responded positively to the cover of forest surrounding the pond. Our results highlight the value of considering acoustic data of red squirrels to quantify habitat quality in boreal forests. We conclude that beaver activity shapes bird assemblages through modification of their habitat, and that some bird guilds are associated negatively with the presence of American red squirrels.</p>
FIG. 8. — A in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 8. — A, Blackia miocaenica Mein, 1970 from Hambach 11C, IPB-HaR-5636, left M3; B-K, Pliopetaurista pliocenica from Hambach 11C: B, IPB- HaR-5614, right m1/2; C, IPB- HaR-5625 left m1/2; D, IPB- HaR-5627, right m1/2; E, left m3; F, IPB-HaR-5629, right P4; G, IPB- HaR-5631, left P4; H, IPB- HaR-5632, left M1/2; I, IPB- HaR-5634, right M1/2; J, IPB- HaR-5633, left M1/2; K, IPB- HaR-5635, left M1/2. All the teeth are shown as left teeth, the teeth that have been mirrored are indicated by underlined letters. Scale bar: 1 mm.
FIG. 9. — A in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 9. — A, Size comparison of Pliopetaurista pliocaenica (Depéret, 1897) M1/2 from Hambach 11C with other published specimens. Black & Kowalski (1974): Pliopetaurista dehneli Sulimski, 1964, Pliopetaurista meini Black & Kowalski 1974, Pliopetaurista cf. pliocaenica (Depéret, 1897); Daxner-HÖck (1975): Pliopetaurista bressana Mein, 1970; Dahlmann (2001): P. pliocaenica, Pliopetaurista raui Dahlmann, 2001; Daxner-HÖck (2004): P. bressana, Pliopetaurista kollmanni Daxner-HÖck, 2004; de Bruijn (1995): P. dehneli Sulimski, 1964; Fejfar & Storch (1990): P. pliocaenica; Gárcia-Alix et al. (2007): P. pliocaenica, P. cf. pliocaenica; Vasileiadou et al. (2012): P. dehneli. In red are our specimens from Hambach 11C, in green the P. pliocaenica specimens and in blue the P. cf. pliocaenica. B, Size comparison of Pliopetaurista pliocaenica m1/2 from Hambach 11C with other published specimens. Black & Kowalski (1974): Pliopetaurista meini; Dahlmann (2001): P. pliocaenica; Daxner-HÖck (1975): Pliopetaurista bressana; Daxner-HÖck (2004): P. bressana, Pliopetaurista kollmanni; de Bruijn (1995): P. dehneli; Colombero & Carnevale (2016): P. pliocaenica; Mansino et al. (2018): P. pliocaenica; MÖrs et al. (1998): P. pliocaenica. In red are our specimens from Hambach 11C, in green the P. pliocaenica specimens and in blue the Pliopetaurista cf. pliocaenica.
FIG. 5 in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 5. — Trogontherium minus Newton, 1890 from Hambach 11C: A, IPB-HaR-5654, labial view of an incisor fragment; B, IPB-HaR-5650, left dp4 labial, occlusal, and lingual views; C, IPB-HaR-5643, upper right jaw fragment with teeth P4 to M2 labial view; D, IPB-HaR-5643, occlusal view; E, IPB-HaR-5643, lingual view; F, IPB-HaR-5645, left P4 labial, occlusal, and lingual views; G, IPB-HaR-5649, right P4 labial, occlusal, and lingual views. All teeth are figured as left teeth, an underlined letter indicates a right tooth. Scale bar: 2 mm.
FIG. 7 in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 7. — Size comparison of our specimens with different species. Trogontherium minus Newton, 1890 from Czernielewski 2022, Hugueney et al. 1989 and Newton 1890. Trogontherium cuvieri Owen, 1846 from Fostowicz-Frelik 2008 and Langeveld 2013. Trogontherium (Euroxenomys) minutum (von Meyer, 1838) from Stefen & Rummel 2003.
FIG. 6 in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 6. — Trogontherium minus Newton, 1890 from Hambach 11C: A, IPB-HaR-5646, left M1/2 labial, occlusal, and lingual views; B, IPB-HaR-5647, left M1/2 labial, occlusal, and lingual views; C, IPB-HaR-5652, right M1/2 labial, occlusal, and lingual views; D, IPB-HaR-5644, upper right M3 occlusal, labial and lingual views; E, IPB-HaR-5648, left M3 labial, occlusal, and lingual views; F, IPB-HaR-5651, right M3 labial, occlusal, and lingual views. All teeth are figured as left teeth, an underlined letter indicates a right tooth. Scale bar: 2 mm.
FIG. 4 in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 4. — Trogontherium minus Newton, 1890 from Hambach 11C, IPB-HaR-5642, left jaw with i to m2: A, labial view; B, occlusal view; C, lingual view. Scale bar: 1 cm.
FIG. 3 in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 3. — Castor fiber Linnaeus, 1758 from Hambach 11C: A, IPB-HaR-5653, incisor fragment labial view and section; B, IPB-HaR-5641, left m1/2 labial, occlusal and lingual views; C, IPB-HaR-5637, left P4 in maxillary fragment, labial, occlusal, and lingual views; D, IPB-HaR-5640, left, P4 labial, occlusal, and lingual views; E, IPB-HaR-5639, left M1/2, labial, occlusal, and lingual views; F, IPB-HaR-5638, left M1/2 labial, occlusal, and lingual views. Scale bar: 2 mm.
FIG. 1. — A in Beavers and flying squirrels (Rodentia: Castoridae, Pteromyini) from the Late Pliocene of Hambach 11C, Germany
FIG. 1. — A, Map of the location of the Hambach lignite mine (from MÖrs & Stefen 2010); B, picture of the outcrop.
Data from: Beaver activity and red squirrel presence predict bird assemblages in boreal Canada
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Born with an advantage: Early life and maternal effects on fitness in Columbian ground squirrels
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Reproductive state alters vocal characteristics of female North American red squirrels (Tamiasciurus hudsonicus)
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Allen Brain Atlas
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