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388 results for “squirrels”
A mapping of keywords from published papers on alien squirrels to biological invasion research themes
<p><strong>Context</strong></p> <p>This dataset was used to produce the worldl and the graphs in the editorial to the research topic <a href="https://www.frontiersin.org/research-topics/29270/ecology-impact-and-management-of-squirrel-invasions"><em>Ecology, impact and management of squirrel invasions</em></a> (La Morgia et al. 2023).</p> <p><strong>Contents of the dataset</strong></p> <p>The dataset contains the keywords of papers since 2000 harvested with a Web of Science search (performed on 29/05/2023) using the advanced search string TS=(invasive squirrel) OR TI=(invasive squirrel) OR AB=(invasive squirrel). We screened the search results, excluding papers irrelevant to alien squirrels, for example, papers on computer science or physiology, medical or other aspects without any bearing to conservation science. To do this, we checked the abstract and keywords of the papers. Out of the 401 initial papers, after this first screening, we kept 217 in this dataset. The keywords of these papers were manually assigned to alien squirrel research topics by the authors of this dataset (using an own categorisation) and then mapped to the seven broad themes of invasive alien species research of <a href="https://doi.org/10.1007/s10530-023-03067-7">Stevenson et al. (2023)</a>: </p> <ol> <li>Ecosystems: topics which discuss a specific region, or biome, or focused on a particular species strongly associated with one ecosystem type;</li> <li>Monitoring: topics regarding all aspects of monitoring, including detection, identification, and distributional mapping;</li> <li>Management and decision-making: topics discussing the management and socio-political aspects of invasion science, such as prevention, control, and policy;</li> <li>Interactions: topics discussing the interactions with native species, or the effects of those interactions</li> <li>Assessing change: topics focused on studying and analysing temporal and ecological change;</li> <li>Traits: topics that explored the characteristics of alien squirrels;</li> <li>Invasion mechanisms: topics discussing dispersal pathways and drivers of spread.</li> </ol> <p><strong>Dataset description</strong></p> <p>Every row (N = 1275) in the comma-separated .csv represents one original keyword with reference to the paper in which that keyword appears and mapped to the research topics on invasive squirrels and the broad themes in invasion biology research. The .csv contains the following fields:</p> <ul> <li>ID: a unique ID assigned to the combination of an original keyword and the corresponding paper harvested from the WoS search</li> <li>original_keyword: the original keywords associated with the paper (WoS search)</li> <li>keyword_topic: categorization of original keywords into topics related to invasive squirrel research by La Morgia et al. (2023)</li> <li>mapped_category: mapping to one of the seven broad themes of invasive alien species research of <a href="https://doi.org/10.1007/s10530-023-03067-7">Stevenson et al. (2023)</a> as listed and described above</li> <li>authors: author(s) of the paper (WoS search)</li> <li>year: publication year of paper (WoS search)</li> <li>title: title of the paper (WoS search)</li> <li>journal: full journal name (WoS search)</li> <li>doi: full doi of the paper (WoS search)</li> </ul> <p><strong>Potential applications of the dataset</strong></p> <p>This dataset can be used to reproduce the graphs in La Morgia et al. (2023) or to perform more in-depth review or analysis of the literature on alien squirrel invasions. For more information and graph code, we refer to <a href="https://github.com/Vale-LaMo/squirrels">this GitHub repository</a>.</p>
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>
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>
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>
Fig. 3 in Phylogenetic Relationships Among Callosciurus Squirrels In The Indochina Peninsula: Phylogenetic Position Of C. Pygerythrus From Myanmar
Fig. 3. Divergence time tree estimated by the RelTime method, based on the maximumlikelihood (ML) analysis under HKY + I + Γ model for the cytochrome b sequences. Divergence times among Callosciurus squirrels in millions of years before present are on branches. Divergence times with high support values are inside squares
Fig. 2 in Phylogenetic Relationships Among Callosciurus Squirrels In The Indochina Peninsula: Phylogenetic Position Of C. Pygerythrus From Myanmar
Fig. 2. Phylogeny of Callosciurus constructed with the maximum-likelihood (ML) under HKY + I + Γ model for cytochrome b sequences. From left, numbers above branches represent: bootstrap values from 1000 replicates of ML and un-weighted maximum parsimony (MP) analyses, bootstrap values from 5000 replicates of neighbor-joining (NJ) analysis and posterior probability supports in Bayesian analysis. Hyphens mean no data, because the clade was absent
Fig. 1 in Phylogenetic Relationships Among Callosciurus Squirrels In The Indochina Peninsula: Phylogenetic Position Of C. Pygerythrus From Myanmar
Fig. 1. Distribution of Callosciurus phayrei (dark gray area) and C. pygerythus (light gray area) in the Indochina Peninsula (KOPROWSKI et al. 2016) and collecting sites of squirrels examined in the present study. Open and closed circles indicate C. phayrei and C. pygerythus, respectively
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. 1 in Cryptosporidium rubeyi n. sp. (Apicomplexa: Cryptosporidiidae) in multiple Spermophilus ground squirrel species
Fig. 1. Cryptosporidium sp. Sbey11c oocysts from California ground squirrels (S. beecheyi). Differential interference contrast (DIC) microscopy (1000×), bar = 10 Mm.
Fig. 2 in Cryptosporidium rubeyi n. sp. (Apicomplexa: Cryptosporidiidae) in multiple Spermophilus ground squirrel species
Fig. 2. Phylogenetic relationships of partial 18S rRNA gene sequences of Cryptosporidium sp. Sbey11c from California ground squirrels (S. beecheyi) and other Cryptosporidium spp. inferred by neighbor-joining analysis with 1000 bootstrapping replicates.
Fig. 3 in Cryptosporidium rubeyi n. sp. (Apicomplexa: Cryptosporidiidae) in multiple Spermophilus ground squirrel species
Fig. 3. Phylogenetic relationships of partial actin gene sequences of Cryptosporidium sp. Sbey11c from California ground squirrels (S. beecheyi) and other Cryptosporidium spp. inferred by neighbor-joining analysis with 1000 bootstrapping replicates.
Fig. 4 in Cryptosporidium rubeyi n. sp. (Apicomplexa: Cryptosporidiidae) in multiple Spermophilus ground squirrel species
Fig. 4. Phylogenetic relationships of partial HSP70 gene sequences of Cryptosporidium sp. Sbey11c from California ground squirrels (S. beecheyi) and other Cryptosporidium spp. inferred by neighbor-joining analysis with 1000 bootstrapping replicates.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.