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Journal articles on the topic 'Otospermophilus'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Smith, Jennifer E., Douglas J. Long, Imani D. Russell, Kate Lee Newcomb, and Valeska D. Muñoz. "Otospermophilus beecheyi(Rodentia: Sciuridae)." Mammalian Species 48, no. 939 (2016): 91–108. http://dx.doi.org/10.1093/mspecies/sew010.

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Smith, Jennifer E., Douglas J. Long, Imani D. Russell, Kate Lee Newcomb, and Valeska D. Muñoz. "Otospermophilus beecheyi (Rodentia: Sciuridae)." Mammalian Species 48, no. 939 (2016): 91–108. https://doi.org/10.1093/mspecies/sew010.

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Smith, Jennifer E., Long, Douglas J., Russell, Imani D., Newcomb, Kate Lee, Muñoz, Valeska D. (2016): Otospermophilus beecheyi (Rodentia: Sciuridae). Mammalian Species 48 (939): 91-108, DOI: 10.1093/mspecies/sew010, URL: http://dx.doi.org/10.1093/mspecies/sew010

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3

Long, Douglas J., and Jennifer E. Smith. "Otospermophilus douglasii (Rodentia: Sciuridae)." Mammalian Species 55, no. 1034 (2023): 1–13. https://doi.org/10.1093/mspecies/sead010.

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Martínez-Coronel, Matías, and Yolanda Hortelano-Moncada. "Nuevos registros de mamíferos en el Centro de Oaxaca." Revista Mexicana de Mastozoología (Nueva Epoca) 10, no. 2 (2020): 45. http://dx.doi.org/10.22201/ie.20074484e.2020.10.2.314.

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RESUMENEn esta nota documentamos la presencia de Chiroderma scopaeum y Molossus molossus en los Valles Centrales de Oaxaca por ejemplares capturados en redes. Con estos registros incrementa el número de especies de murciélagos distribuidos en esta región a 35. Asimismo, presentamos registros fotográficos de Otospermophilus variegatus en dos nuevas localidades de Oaxaca, una ubicada en las Montañas y Valles del Occidente y la otra en los Valles Centrales, que confirman la expansión de la especie hacia el sur de México.Palabras clave: Chiroderma scopaeum, Molossus molossus, Montañas y Valles del

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Álvarez-Castañeda, Sergio Ticul, and Patricia Cortés-Calva. "Genetic evaluation of the Baja California rock squirrel Otospermophilus atricapillus (Rodentia: Sciuridae)." Zootaxa 3138, no. 1 (2011): 35–51. https://doi.org/10.11646/zootaxa.3138.1.2.

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Álvarez-Castañeda, Sergio Ticul, Cortés-Calva, Patricia (2011): Genetic evaluation of the Baja California rock squirrel Otospermophilus atricapillus (Rodentia: Sciuridae). Zootaxa 3138 (1): 35-51, DOI: 10.11646/zootaxa.3138.1.2, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.3138.1.2

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Mercado-Morales, David. "Sciurus alleni and Otospermophilus variegatus winter activity in Nuevo León, México." Therya notes 3, no. 3 (2022): 185–91. http://dx.doi.org/10.12933/therya_notes-22-94.

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La disponibilidad de agua y alimento durante el invierno es esencial para la supervivencia de ardillas no hibernantes en bosques templados; las ardillas arbóreas y terrestres tienen diferentes estrategias para sobrevivir en invierno. Esta nota reporta la actividad y comportamiento de Sciurus alleni y Otospermophilus variegatus a nivel del suelo durante el invierno. Usando cámaras trampa, en un ojo de agua y en un paso de fauna, en un bosque de nogal encarcelado (Juglans mollis), la actividad y comportamiento de ambas ardillas fue registrada; además, por observación directa se analizó la búsque

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7

Goodwin, H. Thomas, and Robert A. Martin. "Ground squirrels (Rodentia, Sciuridae) of the late Cenozoic Meade Basin sequence: diversity and paleoecological implications." Journal of Paleontology 91, no. 6 (2017): 1244–57. http://dx.doi.org/10.1017/jpa.2017.59.

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AbstractThe Meade Basin, SW Kansas, yields a rich vertebrate fossil record from the late Cenozoic. Here, we review fossil ground squirrels (Sciuridae) from the region as a contribution to the broader Meade Basin Rodent Project. We recognize 14 species in seven genera: two species of giant ground squirrels (Paenemarmota Hibbard and Schultz, 1948) from the early Pliocene, and at least 12 species in six extant genera (Ammospermophilus Merriam, 1892; Otospermophilus Brandt, 1844; Ictidomys Allen, 1877; Poliocitellus Howell, 1938; Urocitellus Obolenskij, 1927; Cynomys Rafinesque, 1817) from the Pli

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ÁLVAREZ-CASTAÑEDA, SERGIO TICUL, and PATRICIA CORTÉS-CALVA. "Genetic evaluation of the Baja California rock squirrel Otospermophilus atricapillus (Rodentia: Sciuridae)." Zootaxa 3138, no. 1 (2011): 35. http://dx.doi.org/10.11646/zootaxa.3138.1.2.

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The Baja California rock squirrel (Otospermophilus atricapillus Bryant) is endemic to the Baja California Peninsula, Mexico and known from only five localities. O. atricapillus is considered as the sister species of O. beecheyi (Richardson) and both have been considered different species mainly by its colorations. In an attempt to better understand the relationship within O. atricapillus and with its sister species O. beecheyi, we used genetic information gathered from O. atricapillus, aiming to investigate the phylogenetic and phylogeography of O. atricapillus O. beecheyi. We analyzed two set

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9

Julián Caballero, César Camilo. "Primer registro de Otospermophilus variegatus (Rodentia: Sciuridae) en el municipio de Santa Cruz Xoxocotlán, Oaxaca, México." Mammalogy Notes 7, no. 2 (2022): 275. http://dx.doi.org/10.47603/mano.v7n2.275.

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La Ardilla de roca (Otospermophilus variegatus) se distribuye desde el suroeste de Estados Unidos de América hasta el centro de Oaxaca, México. A pesar de su amplia distribución, la información de su historia natural es relativamente escasa. Esta nota describe el primer registro de la Ardilla de roca para el municipio de Santa Cruz Xoxocotlán, Oaxaca, México, obtenido por evidencia fotográfica. El espécimen de O. variegatus se observó y fotografió en una localidad con vegetación xerófita. La subsistencia de esta especie en la localidad podría deberse a la presencia de cultivos de maíz y alfalf

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10

Le, My-Lan T., Christopher M. Garvin, Jesse R. Barber, and Clinton D. Francis. "Natural sounds alter California ground squirrel, Otospermophilus beecheyi, foraging, vigilance and movement behaviours." Animal Behaviour 157 (November 2019): 51–60. http://dx.doi.org/10.1016/j.anbehav.2019.08.014.

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11

González-Jaramillo, urya Ivonne, Ileana Lozano-Amaro, Yury Glebskiy, and Zenón Cano-Santana. "Mother’s defense of a juvenile rock squirrel (Otospermophilus variegatus) against a rattlesnake (Crotalus molossus)." Therya notes 4, no. 2 (2023): 79–83. http://dx.doi.org/10.12933/therya_notes-23-110.

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La depredación de ardillones de roca (Otospermophilus variegatus) por serpientes de cascabel (Crotalus sp.) ha llevado a un proceso coevolutivo durante el cual los ardillones han desarrollado resistencia al veneno de serpiente de cascabel y una serie de comportamientos complejos que les permiten protegerse contra la depredación. En esta nota describimos una observación de tal comportamiento; cómo una madre ardillón protege a un joven contra el ataque de una serpiente de cascabel. Fuimos testigos de un enfrentamiento entre una madre ardillón y una serpiente de cascabel por un juvenil que fue at

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Putman, Breanna J., Matthew A. Barbour, and Rulon W. Clark. "The Foraging Behavior of Free-ranging Rattlesnakes (Crotalus oreganus) in California Ground Squirrel (Otospermophilus beecheyi) Colonies." Herpetologica 72, no. 1 (2016): 55–63. http://dx.doi.org/10.1655/herpetologica-d-15-00045.

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Tromborg, Chris T., and Richard G. Coss. "Isolation rearing reveals latent antisnake behavior in California ground squirrels (Otospermophilus becheeyi) searching for predatory threats." Animal Cognition 18, no. 4 (2015): 855–65. http://dx.doi.org/10.1007/s10071-015-0853-5.

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ZIEDINS, A. C., B. B. CHOMEL, R. W. KASTEN, A. M. KJEMTRUP, and C. C. CHANG. "Molecular epidemiology ofBartonellaspecies isolated from ground squirrels and other rodents in northern California." Epidemiology and Infection 144, no. 9 (2016): 1837–44. http://dx.doi.org/10.1017/s0950268816000108.

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SUMMARYBartonellaspp. are endemic in wild rodents in many parts of the world. A study conducted in two northern California counties (Sonoma and Yolo) sampling California ground squirrels (Otospermophilus beecheyi) and four other rodent species (Peromyscus maniculatus, P. boylii, P. trueiandNeotoma fuscipes) led to the isolation of small Gram-negative bacilli which were identified asBartonellaspp. based on colony morphology, polymerase chain reaction–restriction fragment length polymorphism (PCR–RFLP) and partial gene sequencing. Overall,Bartonellaspp. were isolated from the blood of 71% (32/45

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15

Negwer, Moritz, Yong-Jun Liu, Dirk Schubert, and David C. Lyon. "V1 connections reveal a series of elongated higher visual areas in the California ground squirrel,Otospermophilus beecheyi." Journal of Comparative Neurology 525, no. 8 (2017): 1909–21. http://dx.doi.org/10.1002/cne.24173.

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Hubbart, Jason A., David S. Jachowski, and David A. Eads. "Seasonal and among-site variation in the occurrence and abundance of fleas on California ground squirrels (Otospermophilus beecheyi)." Journal of Vector Ecology 36, no. 1 (2011): 117–23. http://dx.doi.org/10.1111/j.1948-7134.2011.00148.x.

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Rivera-Ovalle, Leonel, Xochil Vega-Manriquez, César Posadas-Leal, et al. "Detección de anticuerpos anti-Coccidioides immitis en suero de pequeños mamíferos silvestres en una localidad del Altiplano Potosino." Revista Chapingo Serie Zonas Áridas 21, no. 1 (2022): e202206006. http://dx.doi.org/10.5154/r.rchsza.2022.06.006.

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La evidencia histórica con respecto a la coccidioidomicosis en México refiere a una enfermedad con distribución definida en la frontera norte del país. Sin embargo, pese al endemismo señalado en el territorio mexicano, así como en Estados Unidos de América, la información con respecto a esta situación en México es escasa. Esta investigación se señala como el primer informe mexicano sobre la determinación de anticuerpos contra Coccidioides immitis en suero de pequeños mamíferos de carácter silvestre en una región del Altiplano Potosino. En el municipio de Soledad de Graciano Sánchez, San Luis P

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Putman, Breanna J., Richard G. Coss, and Rulon W. Clark. "The ontogeny of antipredator behavior: age differences in California ground squirrels (Otospermophilus beecheyi) at multiple stages of rattlesnake encounters." Behavioral Ecology and Sociobiology 69, no. 9 (2015): 1447–57. http://dx.doi.org/10.1007/s00265-015-1957-2.

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19

Hortelano-Moncada, Yolanda, Águeda Karina Ramos-Rendón, Guillermo Gil-Alarcón, et al. "Dieta de gatos (Felis silvestris catus) y perros (Canis lupus familiaris) errantes en una reserva ecológica urbana en Ciudad de México." Revista Mexicana de Biodiversidad 95 (March 4, 2024): e955280. http://dx.doi.org/10.22201/ib.20078706e.2024.95.5280.

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Se analizó la dieta de gatos (Felis silvestris catus) y perros (Canis lupus familiaris) errantes de la Reserva Ecológica del Pedregal de San Ángel (REPSA), Ciudad Universitaria, UNAM, Ciudad de México. Se examinaron 12 muestras de gatos y 55 de perros obtenidas mediante el Programa de Remediación de Fauna Feral, Secretaría Ejecutiva de la REPSA. La determinación de las especies consumidas se realizó comparando el material con ejemplares depositados en colecciones científicas; adicionalmente para mamíferos, se utilizaron patrones morfológicos de la cutícula y médula del pelo. El análisis mostró

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20

Horak, Katherine E., Christopher M. Campton, and Steven F. Volker. "Are reports of reduced field efficacy of diphacinone and chlorophacinone in California ground squirrels (Otospermophilus beecheyi) due to elevated rodenticide metabolism?" Crop Protection 127 (January 2020): 104969. http://dx.doi.org/10.1016/j.cropro.2019.104969.

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Smallwood, K. Shawn, and Noriko L. Smallwood. "Breeding Density and Collision Mortality of Loggerhead Shrike (Lanius ludovicianus) in the Altamont Pass Wind Resource Area." Diversity 13, no. 11 (2021): 540. http://dx.doi.org/10.3390/d13110540.

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Loggerhead shrike (Lanius ludovicianus) has declined across most or all of its geographic range. The species’ raptorial behavior requires maintenance of large territories, which means populations of breeding shrikes require large areas of habitat and are therefore sensitive to habitat loss and habitat fragmentation. We estimated breeding densities of loggerhead shrikes in the Altamont Pass Wind Resource Area (APWRA), California, where annual shrike mortality caused by wind turbine collisions was high until just before our study began in 2016. Based on surveys across an annual average 50 random

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Baldwin, Roger A., Theresa A. Becchetti, Ryan Meinerz, and Niamh Quinn. "Potential impact of diphacinone application strategies on secondary exposure risk in a common rodent pest: implications for management of California ground squirrels." Environmental Science and Pollution Research 28, no. 33 (2021): 45891–902. http://dx.doi.org/10.1007/s11356-021-13977-5.

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AbstractAnticoagulant rodenticides are a common tool used to manage rodents in agricultural systems, but they have received increased scrutiny given concerns about secondary exposure in non-target wildlife. Rodenticide application strategy is one factor that influences exposure risk. To understand the impact of application strategy, we tested residues of a first-generation anticoagulant (diphacinone) in liver tissue of radiotransmittered California ground squirrels (Otospermophilus beecheyi) following spot treatments, broadcast applications, and bait station applications in rangelands in centr

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Goodrich, Irina, Clifton McKee, and Michael Kosoy. "Trypanosoma (Herpetosoma) diversity in rodents and lagomorphs of New Mexico with a focus on epizootological aspects of infection in Southern Plains woodrats (Neotoma micropus)." PLOS ONE 15, no. 12 (2020): e0244803. http://dx.doi.org/10.1371/journal.pone.0244803.

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Protozoan parasites of the genus Trypanosoma infect a broad diversity of vertebrates and several species cause significant illness in humans. However, understanding of the phylogenetic diversity, host associations, and infection dynamics of Trypanosoma species in naturally infected animals is incomplete. This study investigated the presence of Trypanosoma spp. in wild rodents and lagomorphs in northern New Mexico, United States, as well as phylogenetic relationships among these parasites. A total of 458 samples from 13 rodent and one lagomorph species collected between November 2002 and July 2

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Smith, Jennifer E., Denisse A. Gamboa, Julia M. Spencer, et al. "Split between two worlds: automated sensing reveals links between above- and belowground social networks in a free-living mammal." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1753 (2018): 20170249. http://dx.doi.org/10.1098/rstb.2017.0249.

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Many animals socialize in two or more major ecological contexts. In nature, these contexts often involve one situation in which space is more constrained (e.g. shared refuges, sleeping cliffs, nests, dens or burrows) and another situation in which animal movements are relatively free (e.g. in open spaces lacking architectural constraints). Although it is widely recognized that an individual's characteristics may shape its social life, the extent to which architecture constrains social decisions within and between habitats remains poorly understood. Here we developed a novel, automated-monitori

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Hammond, Talisin T., Minnie Vo, Clara T. Burton, Lisa L. Surber, Eileen A. Lacey, and Jennifer E. Smith. "Physiological and behavioral responses to anthropogenic stressors in a human-tolerant mammal." Journal of Mammalogy 100, no. 6 (2019): 1928–40. http://dx.doi.org/10.1093/jmammal/gyz134.

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Abstract As humans continue to alter natural habitats, many wild animals are facing novel suites of environmental stimuli. These changes, including increased human–wildlife interactions, may exert sublethal impacts on wildlife such as alterations in stress physiology and behavior. California ground squirrels (Otospermophilus beecheyi) occur in human-modified as well as more pristine environments, where they face a variety of anthropogenic and naturally occurring threats. This makes this species a valuable model for examining the effects of diverse challenges on the physiology and behavior of f

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Cypher, Brian L., Erica C. Kelly, Reagen O’Leary, et al. "Conservation of threatened San Joaquin antelope squirrels: distribution surveys, habitat suitability, and conservation recommendations." California Fish and Wildlife Journal, CESA Special Issue (July 6, 2021): 345–66. http://dx.doi.org/10.51492/cfwj.cesasi.21.

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The San Joaquin antelope squirrel (Ammospermophilus nelsoni: SJAS) is listed as Threatened pursuant to the California Endangered Species Act due to profound habitat loss throughout its range in the San Joaquin Desert in California. Habitat loss is still occurring and critical needs for SJAS include identifying occupied sites, quantifying optimal habitat conditions, and conserving habitat. Our objectives were to (1) conduct surveys to identify sites where SJAS were present, (2) assess habitat attributes on all survey sites, (3) generate a GIS-based model of SJAS habitat suitability, (4) use the

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Smallwood, K. Shawn, and Michael L. Morrison. "Burrowing Owls Require Mutualist Species and Ample Interior Habitat Space." Diversity 16, no. 9 (2024): 590. http://dx.doi.org/10.3390/d16090590.

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Mitigating habitat loss of western burrowing owls (Athene cunicularia hypugaea) often involves relocation from California ground squirrel (Otospermophilus beecheyi) burrows to offsite nest boxes. Naval Air Station Lemoore (NASL), Kings and Fresno counties, California, initiated this approach to displace a regionally important population from airfield grasslands. We examined monitoring data of burrowing owls and fossorial mammals at NASL to assess mitigation options. Occupied nests increased by 33 (61%), with 47 nest box installations in 1997–2001, peaked at 87 in 1999, then declined by 50 thro

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Munger, James C., and John C. Holmes. "Benefits of parasitic infection: a test using a ground squirrel – trypanosome system." Canadian Journal of Zoology 66, no. 1 (1988): 222–27. http://dx.doi.org/10.1139/z88-032.

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A proposal that laboratory rats and mice infected with laboratory strains of trypanosomes survived better and grew faster than uninfected controls was tested with a host and parasite newly isolated from a natural field system. Wild-caught young of the year Richardson's ground squirrels (Spermophilus richardsonii) were brought into the laboratory and subjected to three pairs of experimental treatments in a factorial design: (i) infection with Trypanosoma otospermophili or no infection, (ii) restriction to 85% of ad libitum amount of food or ad libitum availability of food, and (iii) a diet defi

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González-Guzmán, Salvador, Eric Mellink, and Scott Tremor. "MELANISTIC CALIFORNIA GROUND SQUIRRELS (OTOSPERMOPHILUS BEECHEYI)." Southwestern Naturalist 65, no. 3-4 (2022). http://dx.doi.org/10.1894/0038-4909-65.3-4.266.

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Rick, Torben C., Hugh D. Radde, Wendy G. Teeter, et al. "Enhancing biodiversity: historical ecology and biogeography of the Santa Catalina Island ground squirrel, Otospermophilus beecheyi nesioticus." Royal Society Open Science 11, no. 11 (2024). http://dx.doi.org/10.1098/rsos.240726.

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People have influenced Earth’s biodiversity for millennia, including numerous introductions of domestic and wild species to islands. Here, we explore the origins and ecology of the Santa Catalina Island ground squirrel (SCIGS; Otospermophilus beecheyi nesioticus ), one of only five endemic terrestrial mammals found on California’s Santa Catalina Island. We synthesized all records of archaeological/palaeontological SCIGS, conducted radiocarbon dating and stable isotope analysis of the potentially earliest SCIGS remains and performed genetic analysis of modern SCIGS. Squirrels were not identifie

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Martínez-Coronel, Matías, and Yolanda Hortelano-Moncada. "Nuevos registros de mamíferos en el centro de Oaxaca, México." Revista Mexicana de Mastozoología, June 12, 2020. https://doi.org/10.5281/zenodo.13487242.

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(Uploaded by Plazi for the Bat Literature Project) With specimens captured in mist nets, we documented the presence of Chiroderma scopaeum and Molossus molossus in the Central Valleys of Oaxaca, these records increase to 35 the species of bats with distribution in this region. Likewise, we present photographic records of Otospermophilus variegatus from two new localities in Oaxaca, one located in the Western Mountains and Valleys and the other in the Central Valleys, which confirm the expansion of the species to southern Mexico.

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Martínez-Coronel, Matías, and Yolanda Hortelano-Moncada. "Nuevos registros de mamíferos en el centro de Oaxaca, México." Revista Mexicana de Mastozoología, June 7, 2020. https://doi.org/10.5281/zenodo.13487242.

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(Uploaded by Plazi for the Bat Literature Project) With specimens captured in mist nets, we documented the presence of Chiroderma scopaeum and Molossus molossus in the Central Valleys of Oaxaca, these records increase to 35 the species of bats with distribution in this region. Likewise, we present photographic records of Otospermophilus variegatus from two new localities in Oaxaca, one located in the Western Mountains and Valleys and the other in the Central Valleys, which confirm the expansion of the species to southern Mexico.

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Martínez-Coronel, Matías, and Yolanda Hortelano-Moncada. "Nuevos registros de mamíferos en el centro de Oaxaca, México." Revista Mexicana de Mastozoología, July 3, 2020. https://doi.org/10.5281/zenodo.13487242.

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(Uploaded by Plazi for the Bat Literature Project) With specimens captured in mist nets, we documented the presence of Chiroderma scopaeum and Molossus molossus in the Central Valleys of Oaxaca, these records increase to 35 the species of bats with distribution in this region. Likewise, we present photographic records of Otospermophilus variegatus from two new localities in Oaxaca, one located in the Western Mountains and Valleys and the other in the Central Valleys, which confirm the expansion of the species to southern Mexico.

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Martínez-Coronel, Matías, and Yolanda Hortelano-Moncada. "Nuevos registros de mamíferos en el centro de Oaxaca, México." Revista Mexicana de Mastozoología, July 10, 2020. https://doi.org/10.5281/zenodo.13487242.

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(Uploaded by Plazi for the Bat Literature Project) With specimens captured in mist nets, we documented the presence of Chiroderma scopaeum and Molossus molossus in the Central Valleys of Oaxaca, these records increase to 35 the species of bats with distribution in this region. Likewise, we present photographic records of Otospermophilus variegatus from two new localities in Oaxaca, one located in the Western Mountains and Valleys and the other in the Central Valleys, which confirm the expansion of the species to southern Mexico.

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SERGIO, TICUL ÁLVAREZ-CASTAÑEDA, and CORTÉS-CALVA PATRICIA. "Genetic evaluation of the Baja California rock squirrel Otospermophilus atricapillus (Rodentia: Sciuridae)." December 1, 2011. https://doi.org/10.5281/zenodo.6632749.

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The Baja California rock squirrel (Otospermophilus atricapillus Bryant) is endemic to the Baja California Peninsula, Mexico and known from only five localities. O. atricapillus is considered as the sister species of O. beecheyi (Richardson) and both have been considered different species mainly by its colorations. In an attempt to better understand the relationship within O. atricapillus and with its sister species O. beecheyi, we used genetic information gathered from O. atricapillus, aiming to investigate the phylogenetic and phylogeography of O. atricapillus - O. beecheyi. We analyzed two s

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Holding, Matthew L., Sree Rohit Raj Kolora, Jennifer E. Smith, Shana L. McDevitt, Peter H. Sudmant, and Rebecca D. Tarvin. "A genome assembly for a textbook mammalian study species, the California ground squirrel (Otospermophilus beecheyi)." Journal of Heredity, July 2, 2025. https://doi.org/10.1093/jhered/esaf045.

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Abstract Squirrels (Rodentia; Sciuridae) are a well-known and diverse group of rodents, including the charismatic ground-dwelling members of the Tribe Marmotini. In particular, the California ground squirrel (Otospermophilus beecheyi) is an emerging model system for the study of social and risk-sensitive behaviors in a rapidly changing world, as well as the physiology of resistance to snake venoms. To complement extensive natural history information for O. beecheyi, we provide a chromosome-scale genome to facilitate molecular studies focused on the genetic basis of ecologically important trait

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Ochoa, Alexander, Alyssa T. B. Hassinger, Matthew L. Holding, and H. Lisle Gibbs. "Genetic characterization of potential venom resistance proteins in California ground squirrels ( Otospermophilus beecheyi ) using transcriptome analyses." Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, May 24, 2022. http://dx.doi.org/10.1002/jez.b.23145.

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Helgen, Kristofer M., F. Russell Cole, Lauren E. Helgen, and Don E. Wilson. "Generic Revision in the Holarctic Ground Squirrel Genus Spermophilus." January 1, 2009. https://doi.org/10.1644/07-mamm-a-309.1.

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The substantial body of research on Holarctic ground squirrels amassed over the past century documents considerable variability in morphological, cytogenetic, ecological, and behavioral attributes in the genus Spermophilus F. Cuvier, 1825. Recent molecular phylogenetic studies suggest that the traditionally recognized genera Marmota Blumenbach, 1779 (marmots), Cynomys Rafinesque, 1817 (prairie dogs), and Ammospermophilus Merriam, 1892 (antelope ground squirrels) render Spermophilus paraphyletic, potentially suggesting that multiple generic-level lineages should be credited within Spermophilus.

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Person, Erin S., Kianna P. von Maydell, Jada E. Baldoza, Eileen A. Lacey, and Jennifer E. Smith. "Effects of sample collection and storage methods on fecal bacterial diversity in California ground squirrels (Otospermophilus beecheyi)." Journal of Mammalogy, June 24, 2023. http://dx.doi.org/10.1093/jmammal/gyad057.

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Abstract Measures of fecal bacterial abundance and taxonomic composition are commonly used as proxies for gut microbial diversity in studies of free-living mammals. Because methods of sample collection and storage may affect measures of bacterial diversity, we evaluated the effects of several procedures on fecal bacterial diversity in a free-living population of California ground squirrels (Otospermophilus beecheyi). Replicate fecal samples from 12 adult female squirrels were collected either from the soil beneath traps in which individuals had been captured or from tubs placed under squirrels

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Freymiller, Grace A., Malachi D. Whitford, Craig P. McGowan, Timothy E. Higham, and Rulon W. Clark. "Springing into action: Comparing escape responses between bipedal and quadrupedal rodents." Ecology and Evolution 14, no. 9 (2024). http://dx.doi.org/10.1002/ece3.70292.

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AbstractPredation is a fundamental selective pressure on animal morphology, as morphology is directly linked with physical performance and evasion. Bipedal heteromyid rodents, which are characterized by unique morphological traits such as enlarged hindlimbs, appear to be more successful than sympatric quadrupedal rodents at escaping predators such as snakes and owls, but no studies have directly compared the escape performance of bipedal and quadrupedal rodents. We used simulated predator attacks to compare the evasive jumping ability of bipedal kangaroo rats (Dipodomys) to that of three quadr

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Holding, Matthew L., Michael G. Sovic, Timothy J. Colston, and H. Lisle Gibbs. "The scales of coevolution: comparative phylogeography and genetic demography of a locally adapted venomous predator and its prey." Biological Journal of the Linnean Society, December 21, 2020. http://dx.doi.org/10.1093/biolinnean/blaa192.

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Abstract Coevolutionary theory predicts that differences in the genetic demography of interacting species can influence patterns of local adaptation by affecting the potential of local populations to respond to selection. We conducted a comparative phylogeographical study of venomous rattlesnakes and their venom-resistant ground squirrel prey across California, and assessed how effective population size (Ne) estimates correspond with a previously documented pattern of rattlesnake local adaptation. Using RAD sequencing markers, we detected lineage relationships among both the rattlesnakes (Crot

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Mai, Vincent, Robert A. Boria, Kerry Padgett, et al. "Molecular and niche modeling approaches to identify potential amplifying hosts for an emerging tick-borne pathogen, Rickettsia rickettsii subsp. californica, the causative agent of Pacific Coast tick fever." Journal of Medical Entomology, December 17, 2024. https://doi.org/10.1093/jme/tjae147.

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Abstract Pacific Coast tick fever is a recently described zoonotic disease in California caused by a spotted fever group rickettsia, Rickettsia rickettsii subsp. californica (formerly Rickettsia 364D) and transmitted by the Pacific Coast tick, Dermacentor occidentalis. Like many emerging vector-borne diseases, knowledge regarding the transmission cycle, contribution from potential amplifying hosts, and geographic distribution of R. rickettsii californica is limited. We paired molecular analysis with comparative spatial niche modeling to identify vertebrate hosts potentially involved in the tra

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Ortiz‐Jimenez, Chelsea A., Sophie Z. Conroy, Erin S. Person, et al. "Human presence shifts the landscape of fear for a free‐living mammal." Ecology 106, no. 1 (2025). https://doi.org/10.1002/ecy.4499.

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AbstractHumans may play a key role in providing small prey mammals spatial and temporal refuge from predators, but few studies have captured the heterogeneity of these effects across space and time. Global COVID‐19 lockdown restrictions offered a unique opportunity to investigate how a sudden change in human presence in a semi‐urban park impacted wildlife. Here, we quantify how changes in the spatial distributions of humans and natural predators influenced the landscape of fear for the California ground squirrel (Otospermophilus beecheyi) in a COVID‐19 pandemic (2020) and non‐COVID (2019) year

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Cypher, Brian, Alyse Gabaldon, Francisco Ruiz Ponce, and Erica Kelly. "Comparison of San Joaquin kit fox den and California ground squirrel burrow attributes." California Fish and Wildlife Journal 109, no. 4 (2023). http://dx.doi.org/10.51492/cfwj.109.17.

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Endangered San Joaquin kit foxes (Vulpes macrotis mutica; SJKF) and California ground squirrels (Otospermophilus beecheyi; CAGS) occur sympatrically in many locations. CAGS can constitute a nuisance species and control strategies have included lethal measures administered within CAGS burrows. These measures could harm or kill a SJKF if mistakenly applied to an occupied SJKF den. To identify attributes to distinguish between SJKF dens and CAGS burrow, we assessed dimensions, penetration depths by 9.7-cm and 7.5-cm spheres, ejecta patterns, and the presence of various types of sign at 65 dens to

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