Neotoma Albigula
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The white-throated woodrat (''Neotoma albigula'') is a species of
rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are n ...
in the family
Cricetidae The Cricetidae are a family of rodents in the large and complex superfamily Muroidea. It includes true hamsters, voles, lemmings, muskrats, and New World rats and mice. At almost 608 species, it is the second-largest family of mammals, and h ...
. It is found from central
Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
north to
Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...
and
Colorado Colorado (, other variants) is a state in the Mountain states, Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the wes ...
in the United States. It is primarily a western species in the United States, extending from central
Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...
west to southeastern
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
. Populations east of the Rio Grande in
New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ke ...
and Trans-Pecos Texas, previously considered to be variants of the white-throated woodrat, have since 1988 been assigned to the white-toothed woodrat (''Neotoma leucodon''). The animal lives mostly in the Upper and Lower Sonoran life zones, occurring from pinyon-juniper woodland in higher country to desert habitats at lower elevations. As with other species of woodrats, the white-throated woodrat constructs middens of a variety of materials such as sticks, cactus parts, and miscellaneous debris. An above-ground chamber within the midden contains a nest lined with grasses and kept free of feces. In non-rocky areas, the den usually is several feet in diameter and most commonly built around the base of a shrub that gives additional cover. In areas of rocky outcrops, crevices often are utilized, with sticks and other materials preventing free access to the nesting chamber. Molecular data suggest that this species separated from other species of the ''Neotoma floridana'' group ('' Neotoma floridana'', '' Neotoma micropus'', '' Neotoma leucodon'') about 155,000 years ago during the
Illinoian Stage The Illinoian Stage is the name used by Quaternary geologists in North America to designate the period c.191,000 to c.130,000 years ago, during the middle Pleistocene, when sediments comprising the Illinoian Glacial Lobe were deposited. It precedes ...
of the
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in ...
. This is consistent with the oldest known
fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
s from
Slaton, Texas Slaton is a city in Lubbock County, Texas, United States founded by German immigrants. Slaton was the westernmost German settlement in Texas. The population was 6,121 at the 2010 census. Slaton is part of the Lubbock Metropolitan Statisti ...
. This rodent is a common fossil in Southwestern cave faunas, with over 20 fossil localities of Pleistocene age known from New Mexico alone.


Distribution

The ranges of the white-throated woodrat and its subspecies are from the southeastern corners of Nevada and California across southern Utah and all of Arizona to southwestern Colorado, across west Texas and south to central Mexico.Hall, E. Raymond; Kelson, Keith R. 1959. The mammals of North America. New York: Ronald Press Company *''Neotoma albigula albigula'' (Hartley) – Northern New Mexico and northeastern Arizona south along the east side of the Sierra Madre Oriental, to southern Coahuila, Mexico. Also central Texas to western Arizona, and south along the western side of the Sierra Madre Occidental to central Sonora *''Neotoma albigula brevicauda'' (Durrant) – Utah and Colorado *''Neotoma albigula durangae'' (J. A. Allen) – Southwestern Chihuahua and central Durango, Mexico *''Neotoma albigula laplataensis'' (F.W. Miller) – Utah, Colorado, and Arizona *''Neotoma albigula latifrons'' (Merriam) – Michoacán, Mexico *''Neotoma albigula leucodon'' (Merriam) – East of the Rio Grande in New Mexico, Texas, and Oklahoma; Durango, Zacatecas, San Luis Potosí, Guanajuato, Jalisco, Aguascalientes, Querétaro, Hidalgo, and southeastern Coahuila, Mexico *''Neotoma albigula mearnsi'' (Goldman) – Arizona *''Neotoma albigula melanura'' (Merriam) – Central Sonora, Chihuahua, and Sinaloa, Mexico *''Neotoma albigula melas'' (Dice) – New Mexico *''Neotoma albigula robusta'' (Blair) – Texas *''Neotoma albigula seri'' (Townsend) – Northeastern Sonora, Mexico *''Neotoma albigula sheldoni'' (Goldman) – Northeastern Sonora, Mexico *''Neotoma albigula subsolana'' (Alvarez) – Coahuila, Tamaulipas, Nuevo León, and Coahuila, Mexico *''Neotoma albigula venusta'' (True) – Colorado River valley in western Arizona south to Sonora and Baja California, Mexico *''Neotoma albigula warreni'' – Colorado, Oklahoma, northeastern New Mexico, and Texas In general, white-throated woodrats occupy desert
grassland A grassland is an area where the vegetation is dominated by grasses ( Poaceae). However, sedge ( Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur na ...
s, semiarid shrublands,Hall, E. Raymond. (1981) "''Neotoma albigula'': White-throated wood rat", pp. 751–754 in ''The mammals of North America''. 2nd ed. Vol. 2. New York: John Wiley & Sons, .Whitaker, John O., Jr. 1980. National Audubon Society field guide to North American mammals. New York: Alfred A. Knopf, Inc. saguaro (''Carnegiea gigantea'') cactus communities,Kricher, John C. (1993) A field guide to the ecology of western forests. The Peterson Field Guide Series No. 45. Boston, MA: Houghton Mifflin Company. pinyon-juniper (''Pinus-Juniperus'' spp.) woodlands, interior ponderosa pine (''P. ponderosa var. scopulorum'') forests, and Madrean evergreen woodland (''Pinus'' spp.-''Quercus'' spp.).


Preferred habitat

The white-throated woodrat occupies a variety of plant communities from sea level to 9,200 feet (2,800 m) but is most common in Sonoran and Chihuahuan desert grassland and desert shrub habitats. The white-throated woodrat is generally associated with creosotebush, mesquite, cacti (particularly prickly-pear and cholla (''Cylindropuntia'' spp.)), catclaw acacia, and paloverde. These plants provide cover and succulent plant food (>50% water by weight) (see section "Food habits"), the 2 most critical habitat requirements for white-throated woodrat. White-throated woodrats prefer habitat with low tree canopy cover, high shrub and rock cover, and
coarse woody debris Coarse woody debris (CWD) or coarse woody habitat (CWH) refers to fallen dead trees and the remains of large branches on the ground in forests and in rivers or wetlands.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). C ...
. When available, natural and human constructed riparian habitat may be used by white-throated woodrats.


Tree, shrub, and rock cover

In several studies in Arizona, white-throated woodrats preferred low tree cover and high shrub, rock, and litter cover.Boyett, William D. 2001. Habitat relations of rodents in the Hualapai Mountains of northwestern Arizona. Oshkosh, WI: University of Wisconsin Oshkosh. Thesis In
ponderosa pine ''Pinus ponderosa'', commonly known as the ponderosa pine, bull pine, blackjack pine, western yellow-pine, or filipinus pine is a very large pine tree species of variable habitat native to mountainous regions of western North America. It is the ...
-
Gambel oak ''Quercus gambelii'', with the common name Gambel oak, is a deciduous small tree or large shrub that is widespread in the foothills and lower mountains of western North America. It is also regionally called scrub oak, oak brush, and white oak. ...
habitat in the Hualapai Mountains in Arizona, white-throated woodrat presence was negatively associated with high tree cover and high herbaceous cover and positively associated with high shrub and rock cover. On plots where white-throated woodrats were trapped, mean tree canopy cover ranged from 30% to 57%, mean herbaceous cover ranged from 2% to 10%, mean shrub cover ranged from 5% to 19%, and mean rock cover ranged from 3% to 14%. In desert riparian floodplain habitat at Montezuma Castle National Monument, Arizona, white-throated woodrats were more abundant in an active riparian channel and floodplain that had lower tree cover and a higher percentage of forbs and rocks than a mesquite bosque. The active riparian channel and floodplain was dominated by desert willow, velvet ash (Fraxinus velutina), Arizona sycamore (Platanus wrightii), and velvet mesquite. The mesquite bosque was dominated by velvet mesquite, catclaw acacia, and broom snakeweed. In pinyon-juniper woodlands in
Grant County, New Mexico Grant County is a county located in the U.S. state of New Mexico. At the 2020 census, the population was 28,185. Its county seat is Silver City. The county was founded in 1868 and named for Ulysses S. Grant, the 18th President of the United St ...
, total overstory density was more important than overstory species composition in influencing white-throated woodrat occurrence. The greatest densities of white-throated woodrat houses were on plots containing 376 to 750 overstory plants per hectare: White-throated woodrats prefer rocky areas within forested habitat, including ledges, slides, cliffs, and canyons.Goodwin, John G., Jr.; Hungerford, C. Roger. (1979) Rodent population densities and food habits in Arizona ponderosa pine forests. Res. Pap. RM-214. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station.Goodwin, John Gravatt, Jr. (1975) Population densities and food selection of small rodents in Arizona ponderosa pine forests. Tucson, AZ: University of Arizona. Thesis In a ponderosa pine forest on the Beaver Creek Watershed in the Coconino National Forest, all white-throated woodrats were captured within 210 feet (64 m) of rocky habitat. In ponderosa pine-Gambel oak habitat in the Hualapai Mountains, white-throated woodrat presence was positively associated with high (3% to 19%) rock cover.


Riparian

The white-throated woodrat is well-adapted to
xeric Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature. Deserts and xeric (ancient Greek xērós, “dry") shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area. Ecoregions in this h ...
habitats, but may also be found in riparian areas. They may utilize both natural and human-constructed areas when available.


Natural

At Montezuma Castle National Monument, white-throated woodrat abundance was generally greater in an active riparian channel and floodplain than a mesquite bosque that was 7 to 13 feet (2–4 m) above the channel and floodplain and not subject to flooding. The active riparian channel and floodplain was dominated by desert willow, velvet ash, Arizona sycamore, and velvet mesquite. The mesquite bosque was dominated by velvet mesquite, catclaw acacia, and broom snakeweed. Despite greater abundance of white-throated woodrat in the active riparian channel and floodplain, body weights of male white-throated woodrat were significantly (P<0.05) higher in the mesquite bosque, suggesting that it was "higher quality" habitat. Although preferred habitat differed between male and female white-throated woodrats on the Santa Rita Experimental Range, Arizona, both genders showed some preference for riparian woodland typified by Arizona white oak and netleaf hackberry:


Human constructed

Construction of water developments in xeric habitat in Arizona may provide habitat and water for white-throated woodrats. On the Cabeza Prieta National Wildlife Refuge in southwestern Arizona, white-throated woodrats were trapped most often in velvet Mesquite Bosque thickets that grew closest to a human constructed water development. White-throated woodrats were trapped least often in habitat dominated by creosotebush and furthest away (distance not given) from the water development. No white-throated woodrats were trapped at a nearby dry water development. White-throated woodrats also occupied a human constructed desert riparian habitat at No Name Lake on the Colorado River Indian Reservation on the Arizona side of the
Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid watershed that encompasses parts of seven U.S. s ...
. The area was cleared of nonnative tamarisk (''Tamarix'' spp.) and 80% of the area was planted with native
Fremont cottonwood ''Populus fremontii'', commonly known as Frémont's cottonwood, is a cottonwood (and thus a poplar) native to riparian zones of the Southwestern United States and northern through central Mexico. It is one of three species in ''Populus'' sect. ...
and honey mesquite. Other vegetation included Goodding's willow ''
Salix gooddingii ''Salix gooddingii'' is a species of willow known by the common name Goodding's willow, or Goodding's black willow. It was named for its collector, Leslie Newton Goodding. ''Salix gooddingii'' is native to the southwestern United States and no ...
'', blue paloverde (''
Parkinsonia florida ''Parkinsonia florida'', the blue palo verde ( syn. ''Cercidium floridum''), is a species of palo verde native to the Sonoran Deserts in the Southwestern United States and Northwestern Mexico.
''), big saltbush ('' Atriplex lentiformis''), and California fan palm (''
Washingtonia filifera ''Washingtonia filifera'', the desert fan palm, California fan palm, or California palm,Flora of North America Association. ''Flora of North America: North of Mexico Volume 22: Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in Part), and Zi ...
'').


Coarse woody debris

Habitat with abundant
coarse woody debris Coarse woody debris (CWD) or coarse woody habitat (CWH) refers to fallen dead trees and the remains of large branches on the ground in forests and in rivers or wetlands.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). C ...
is preferred by white-throated woodrats for cover (see Cover). In pinyon-juniper woodlands at the Piñon Canyon Maneuver site near
Trinidad, Colorado Trinidad is the home rule municipality that is the county seat and the most populous municipality of Las Animas County, Colorado, United States. The population was 8,329 as of the 2020 census. Trinidad lies north of Raton, New Mexico, and s ...
, white-throated woodrats were captured most often in areas with coarse woody debris. In an actively flooded riparian channel and floodplain at Montezuma Castle National Monument, white-throated woodrat occurrence was significantly (P<0.05) greater in areas containing coarse woody debris than areas without coarse woody debris. In a pinyon-juniper woodland in the Gila National Forest, New Mexico, white-throated woodrats responded favorably to mechanical treatments that increased the amount of coarse woody debris. Of 4 treatments (untreated; bulldozed/piled/burned; bulldozed; and thinned), white-throated woodrats were most abundant on bulldozed plots and thinned plots, where slash accumulations were 2.5 to 3 times greater than on other plots. On bulldozed plots, Colorado pinyon, one-seed juniper, and alligator juniper trees were pushed over and left in place. On thinned plots, Colorado pinyon and juniper were cut to a minimum spacing of 20.0 feet (6.1 m) and left in place. The table below shows total numbers of woodrats on 4 plots: White-throated woodrat density increased in a pinyon-juniper woodland in Grant County, New Mexico, where trees were uprooted and piled to improve livestock grazing. The felled trees provided white-throated woodrats with cover and building materials.


Cover requirements

White-throated woodrats must rely on self-constructed, ground-level shelter to lower the energetic costs of thermoregulation in extreme environments. White-throated woodrats typically use 2 types of shelter: houses, constructed at the base of plants, and dens in rock crevices. Other shelter types include holes and crevices in cutbanks along washes, burrows of other animals, piles of coarse woody debris, and human habitations and structures. Houses and dens are often maintained by successive generations of white-throated woodrats. Houses are built by white-throated woodrats at the base of trees, shrubs, and cacti or in piles of coarse woody debris. White-throated woodrats prefer to construct houses at the bases of plants that provide both adequate shelter and food. Houses are constructed of various materials and are typically 3 to 10 feet (1–3 m) in diameter and up to 3 feet tall. Dens function as houses but are located in rock crevices, rock fissures, and under boulder piles.Martin, Alexander C.; Zim, Herbert S.; Nelson, Arnold L. 1951. American wildlife and plants. New York: McGraw-Hill Book Company, Inc. Houses and dens enclose a system of runways and chambers, including the white-throated woodrat's nest. The nest averages 8 inches (20 cm) in diameter and is composed of soft, fine material including grass, shredded prickly-pear fibers, or juniper bark.


Building materials

White-throated woodrats use locally available building materials to construct houses. In wooded areas, white-throated woodrats use sticks and other debris, and in deserts, parts of cacti, catclaw acacia, mesquite, and yucca are typically used. Cactus parts are preferred building materials; preference for cacti is so strong that white-throated woodrat houses may not contain a proportionally representative sample of the surrounding plant community. Other building materials used by white-throated woodrats across their range include feces, bones, and human objects. Of 100 white-throated woodrat houses found on the Santa Rita Experimental Range, 75 different items were used for construction. The most commonly used building materials included mesquite, catclaw acacia, paloverde, desert ironwood (Olneya tesota), and creosotebush twigs; cholla joints and fruits; portions of prickly-pear where it was abundant; and juniper, pinyon pine, and oak twigs where they were abundant. Other items included horse, cow, and coyote dung, animal bones, stones, and human-discarded materials.Vaughan, Terry A. (1990) "Ecology of living packrats", pp. 14–27 in: Betancourt, Julio L.; Van Devender, Thomas R.; Martin, Paul S., eds. ''Packrat middens''. Tucson, AZ: University of Arizona Press. Building materials are gathered near the white-throated woodrat's shelter. At McDowell Mountain Regional Park, Arizona, white-throated woodrats gathered 30% of house building materials within 33 feet (10 m) from their shelter. Houses and dens are altered and refurbished during the year using new and old building materials.Newton, Mark Alan. (1990) ''The ecology, behavior and evolutionary dynamics of the white-throated woodrat (Neotoma albigula)''. Tempe, AZ: Arizona State University. Dissertation In Guadalupe Mountains National Park and the Lower Sonoran zone of Arizona, use of building materials depended on availability. Juniper leaves and berries were used most often in a pinyon-juniper woodland, and mesquite leaves and pods and Christmas cactus ('' Cylindropuntia leptocaulis'') joints were used most often in a desert scrub habitat. In the Lower Sonoran desert of Arizona, white-throated woodrats favored some plants because of their structural and food values and favored other plants due to their availability. When available, cholla was used most often for building material due to its structural and food values. Mesquite sticks were used frequently. Although mesquite was seldom used for food, mesquite sticks were abundant at the base of plants so they were readily available. White bursage (Ambrosia dumosa) was very abundant and used for building material, even though plants were too small to shelter a white-throated woodrat den.


Shelter sites

Cover near the ground is an important criterion for white-throated woodrat shelter sites. In northern portions of their range, white-throated woodrats tend to construct houses at the bases of trees; in southern portions of their range, white-throated woodrats tend to construct houses at the bases of shrub-trees, shrubs, or cacti.Cornely, John E. (1979) "Ecological distribution of woodrats (genus ''Neotoma'') in Guadalupe Mountains National Park, Texas", pp. 373–394 in: Genoways, Hugh H.; Baker, Robert J., eds. ''Biological investigations in the Guadalupe Mountains National Park, Texas'': Proceedings of a symposium; 1975 April 4–5; Lubbock, TX. Proceedings and Transactions Series Number 4. Washington, DC: U.S. Department of the Interior, National Park Service. When available, rocks are preferred by white-throated woodrats for shelter because they provide more protection from variations in ambient temperature than the base of plants.Olsen, Ronald Werner. (1970) Secondary habitat selection in the white-throated woodrat (''Neotoma albigula''). Madison, WI: University of Wisconsin. Dissertation


Plants

Although any tree, shrub, or cactus may be used by white-throated woodrats for shelter sites, the most commonly used plants are discussed below. White-throated woodrats construct houses at the base of live and dead fallen juniper trees in pinyon-juniper woodlands in Arizona, New Mexico, Utah, and Texas. The base of pinyons are occasionally used. Mesquite is often favored by white-throated woodrats for shelter in habitat dominated by mesquite in New Mexico, Arizona,Brown, James H. 1968. Adaptation to environmental temperature in two species of woodrats, Neotoma cinerea and N. albigula. Miscellaneous Publications No. 135. Ann Arbor, MI: University of Michigan, Museum of Zoology. California, and Texas. In habitat dominated by mesquite and
creosote bush ''Larrea tridentata'', called creosote bush and greasewood as a plant, chaparral as a medicinal herb, and ''gobernadora'' (Spanish for "governess") in Mexico, due to its ability to secure more water by inhibiting the growth of nearby plants. In S ...
in San Diego County, California, all white-throated woodrat houses were located at the bases of
honey mesquite ''Prosopis glandulosa'', commonly known as honey mesquite, is a species of small to medium-sized, thorny shrub or tree in the legume family (Fabaceae). Distribution The plant is primarily native to the Southwestern United States and Northern M ...
. Twenty to 26-foot tall (6–8 m) honey mesquite were preferred over 3 to 10 foot (1–3 m) tall honey mesquite, probably because they provided more shelter and abundant, accessible food. An exception in habitat dominated by mesquite occurred on the Santa Cruz river bottom near Tucson, Arizona, where white-throated woodrat houses were also built under netleaf hackberry, American black elderberry (
Sambucus nigra ''Sambucus nigra'' is a species complex of flowering plants in the family Adoxaceae native to most of Europe. Common names include elder, elderberry, black elder, European elder, European elderberry, European black elderberry and tramman (Isle ...
), skunkbush sumac (''
Rhus trilobata ''Rhus trilobata'' is a shrub in the sumac genus ('' Rhus'') with the common names skunkbush sumac, sourberry, skunkbush, and three-leaf sumac. It is native to the western half of Canada and the Western United States, from the Great Plains to ...
''), bear grass (''
Nolina ''Nolina'' is a genus of tropical xerophytic flowering plants, with the principal distribution being in Mexico and extending into the southern United States. They are large, dioecious plants. Some botanists have included the genus '' Beaucarne ...
'' spp.), or
saguaro The saguaro (, ) (''Carnegiea gigantea'') is a tree-like cactus species in the monotypic genus ''Carnegiea'' that can grow to be over tall. It is native to the Sonoran Desert in Arizona, the Mexican state of Sonora, and the Whipple Mountai ...
. In habitats where yucca are abundant white-throated woodrats use the base of yucca for shelter sites. On the Jornada Experiment Range in New Mexico, and the Black Gap Wildlife Management Refuge in Trans-Pecos Texas, white-throated woodrats built houses at the bases and fallen trunks of yucca. Soaptree yucca was used by white-throated woodrats in the lower Sonoran zone of the Lordsburg Plains in New Mexico and the San Simon Valley in Arizona. Cholla and prickly-pear are often used by white-throated woodrats for cover because they provide excellent protection from predators, as well as food and water. One of the factors in white-throated woodrat shelter-site selection in McDowell Mountain Regional Park was presence of teddy bear cholla. In the Cholla Garden in
Joshua Tree National Park Joshua Tree National Park is an American national park in southeastern California, east of San Bernardino and Los Angeles and north of Palm Springs. It is named after the Joshua trees (''Yucca brevifolia'') native to the Mojave Desert. Origin ...
, white-throated woodrats depended on stands of jumping cholla (Cylindropuntia fulgida) for cover, and in the Lower Sonoran zone of Arizona, most white-throated woodrat dens were found at the bases of cholla and prickly-pear. In
Guadalupe Mountains National Park Guadalupe Mountains National Park is an American national park in the Guadalupe Mountains, east of El Paso, Texas. The mountain range includes Guadalupe Peak, the highest point in Texas at , and El Capitan used as a landmark by travelers on the ...
, white-throated woodrat distribution may be limited more by the presence of Mexican woodrats (N. mexicana) and the southern plains woodrat (N. micropus) than by habitat limitations. In areas not inhabited by Mexican woodrats and southern plains woodrats, the white-throated woodrat constructed houses at bases of prickly-pears. In areas where white-throated woodrats and southern plains woodrats lived in close proximity, white-throated woodrat constructed houses under honey mesquite. In the Lower Sonoran zone of Arizona and New Mexico, white-throated woodrats commonly used the bases of catclaw acacia for shelter. White-throated woodrats selected multiple-stemmed plants over single-stemmed plants and a dense, low canopy over a tall, thin canopy in habitat dominated by triangle bursage in
Organ Pipe Cactus National Monument Organ Pipe Cactus National Monument is a U.S. national monument and UNESCO biosphere reserve located in extreme southern Arizona that shares a border with the Mexican state of Sonora. The park is the only place in the United States where the ...
in Arizona and
New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ke ...
. White-throated woodrats selected house sites in reverse order of plant abundance: yellow paloverde 18.1 plants/ha, 6 houses; desert ironwood, 7.6 plants/ha, 14 houses; and organ pipe cactus, 5.0 plants/ha, 21 houses. Yellow paloverde was probably selected for shelter least often because it is a single-stemmed tree with a tall canopy; organpipe cactus (''
Stenocereus thurberi ''Stenocereus thurberi'', the organ pipe cactus, is a species of cactus native to Mexico and the United States. The species is found in rocky desert. Two subspecies are recognized based on their distribution and height. The Organ Pipe Cactus Nati ...
'') was probably selected most often because it is a multiple-stemmed plant with many cylindrical stems branching near the ground from a central trunk, providing more cover.


Other shelter sites

In juniper woodlands in the high desert of southeastern Utah, white-throated woodrats occasionally denned under boulder crevices at the bases of vertical cliffs. In habitat dominated by brittle bush in Saguaro National Monument, all 103 white-throated woodrat dens were located within jumbles of rocks or under boulders. Ninety-one dens were located under boulders >7 feet (2 m) in diameter, and 12 dens were located under boulders <7 feet in diameter. White-throated woodrats occasionally use river banks, subterranean areas, or caves for shelter. In habitat dominated by honey mesquite and creosotebush at Carrizo Creek in San Diego County, white-throated woodrats sought cover either in river banks or burrows that were probably excavated by kangaroo rats (''Dipodomys'' spp.). Lack of stick houses may have been due to a harsh summer climate, ease of burrowing in loose sand, scarcity of building materials, or adequate overhead protection by honey mesquite. River banks were 6 to 15 feet (2–5 m) high, and burrows were excavated at various heights from the bottom. Hole diameter was 3.5 to 7 inches (8.9–18 cm). White-throated woodrats also dwelled in burrows with as many as 8 openings, covered with a few small twigs, at the bases of honey mesquite. In a similar habitat type in the Mesilla Valley of New Mexico, white-throated woodrats denned in sand dunes created by banner-tailed kangaroo rats (''D. spectabilis'') around honey mesquite.


Timing of major life events

The white-throated woodrat is a small rodent measuring an average of 12.9 inches (32.8 cm) and weighing an average of 188 g for females and 224 g for males. With the exception of lactating females, white-throated woodrats are solitary and occupy separate houses. They are primarily nocturnal and are active year-round. According to Brown and Zeng, maximum longevity for the white-throated woodrat is 45 months, and according to Newton, maximum longevity is 72 months. The mating season of white-throated woodrats varies across their range. In Arizona, the mating season is from January to August. In Big Bend National Park, Texas, mating occurs at least from January to November and may occur year-round. In California, the mating season is in February and March, according to Rainey, and in March, April, and possibly May, according to Schwartz and Bleich. The mating system of the white-throated woodrat is polygynous. Gestation for white-throated woodrats lasts 37 to 38 days, and young are most often born in spring and early summer. In Arizona, mean litter sizes were 1.95 young/litter (n=93 litters) and 2.5 young/litter (n=27 litters). Young white-throated woodrats are weaned 62 to 72 days after birth and reach sexual maturity 166 to 176 days after birth. Weaning and sexual maturity of the subspecies Neotoma albigula venusta in western Arizona, Sonora, and Baja California occur earlier: young are weaned between 27 and 40 days, and reach sexual maturity 80 to 87 days after birth. In Joshua Tree National Monument, California, young white-throated woodrats establish their own dens by August and September, several months after birth. Descriptions of the home range of the white-throated woodrat are lacking. The home range of 1 immature female white-throated woodrat on the Coconino National Forest, Arizona, was 47,760 ft2 (4,437 m2). White-throated woodrat density may be governed by the number of suitable plants available for shelter, food, and water. In Joshua Tree National Monument, there was a significant (P<0.001) positive relationship between white-throated woodrat density and teddybear cholla density, which provided shelter, food, and water. In the Mesilla Valley of southern New Mexico, white-throated woodrat density was more dependent on plants that provided sufficient water and food than on plants that provided shelter.


Food habits

White-throated woodrats are opportunistic and primarily herbivorous 1 Their diet consists of seeds, fruits, green portions of plants, flowers, small amounts of grass, and occasionally beetles (Coleoptera), ants (Hymenoptera), and reptiles. Some of the most commonly consumed plants across the white-throated woodrat's range include mesquite flowers, leaves, seeds, and bark, cacti flowers, stems, and fruits, and yucca leaves.Wood, John E. 1969. Rodent populations and their impact on desert rangelands. Bulletin 555. Las Cruces, NM: New Mexico State University, Agricultural Experiment Station Foods eaten by white-throated woodrats depend on availability. In Great Basin scrub desert and juniper woodlands in northern Arizona (
Coconino County Coconino County is a county in the north-central part of the U.S. state of Arizona. Its population was 145,101 at the 2020 census. The county seat is Flagstaff. The county takes its name from ''Cohonino'', a name applied to the Havasupai p ...
) white-throated woodrat diet was 29% yucca, 24% juniper, 7% rabbitbrush (''Chrysothamnus'' spp.), 6% sumac, 5% Apache-plume (''Fallugia'' spp.), 4% sagebrush (''Artemisia'' spp.), 4% saltbush, and 3% ephedra (''Ephedra'' spp.). In the Lower Sonoran zone of southern Arizona (Santa Rita Experimental Range), cacti and mesquite were the primary foods eaten. When offered a choice between cacti with spines and cacti without, white-throated woodrats preferred those with spines, possibly because spines indicate cacti with more protein and less fibre. They also placed the spines around their nests, acting as a defence against predators. For a complete list of foods eaten by white-throated woodrats in the Santa Rita Experimental Range, see Vorhies and Taylor. In the southern Great Basin, Navajo yucca (''Y. baileyi'') is an important food for the white-throated woodrat. White-throated woodrats require large amounts of water obtained through various xerophytic plants, especially cacti. In Organ Pipe National Monument, white-throated woodrats relied heavily on teddybear cholla, buckhorn cholla (''Cylindropuntia acanthocarpa''), jumping cholla, and goatnut (''Simmondsia'' spp.) for water. In Coconino County, white-throated woodrats obtained water from evergreen species (''Ephedra'' spp., ''Yucca'' spp., and ''Juniperus'' spp.), which maintained a high year-round water content. The white-throated woodrat diet varies seasonally. In Coconino County, white-throated woodrats ate a variety of plants, including deciduous shrubs, during warm, wet months when plant moisture was high. During cool, dry months, their diet was restricted largely to evergreen plants. Regardless of season, white-throated woodrats preferred to eat evergreen species. At Carrizo Creek, honey mesquite leaves, flowers, and fruits were the main foods eaten from the end of March until the end of summer. After honey mesquite lost its leaves, white-throated woodrats subsisted on stored beans, bark, and stems. Some white-throated woodrats store food in their houses. Of 30 white-throated woodrat dens found in
Doña Ana County, New Mexico Doña Ana County is located in the southern part of the State of New Mexico, United States. As of the 2020 U.S. Census, its population was 219,561, which makes it the second-most populated county in New Mexico. Its county seat is Las Cruces, t ...
, 77% contained stored food. The average weight of stored food was 2.2 pounds (1.0 kg)/den, range 0.1 to 9.3 pounds (0.05–4.2 kg)/den. Most stored food consisted of mesquite beans and cacti and forb seeds. In general, white-throated woodrats collect food within a 98- to 164-foot (30–50 m) radius of their dens.


Predators

Predators of white-throated woodrat include weasels (''Mustela'' spp.), bobcats (''Lynx rufus''),
ring-tailed cat The ringtail (''Bassariscus astutus'') is a mammal of the raccoon family native to arid regions of North America. It is widely distributed and well adapted to disturbed areas. It has been legally trapped for its fur. It is listed as Least Co ...
s (''Bassariscus astutus''),Vorhies, Charles T.; Taylor, Walter P. (1940) "Life history and ecology of the white-throated woodrat, ''Neotoma albigula albigula'' Hartley, in relation to grazing in Arizona". In: Tech. Bull. No. 86. Tucson, AZ: University of Arizona, Agricultural Experiment Station: 455–529 coyotes (''Canis latrans''),
American badger The American badger (''Taxidea taxus'') is a North American badger similar in appearance to the European badger, although not closely related. It is found in the western, central, and northeastern United States, northern Mexico, and south-cent ...
s (''Taxidea taxus''), Mexican spotted owls (''Strix occidentalis lucida''),
great horned owl The great horned owl (''Bubo virginianus''), also known as the tiger owl (originally derived from early naturalists' description as the "winged tiger" or "tiger of the air"), or the hoot owl, is a large owl native to the Americas. It is an extre ...
s (''Bubo virginianus''),
bullsnake The bullsnake (''Pituophis catenifer sayi)'' is a large, nonvenomous, colubrid snake. It is a subspecies of the gopher snake (''Pituophis catenifer''). The bullsnake is one of the largest/longest snakes of North America and the United States, re ...
s (''Pituophis catenifer sayi''), and rattlesnakes (''Crotalus'' spp.).


References


Further reading

*Harris, A. H. 1993. Quaternary vertebrates of New Mexico. pp. 179–107, ''in'' Vertebrate paleontology in New Mexico. New Mexico Museum of Natural History and Science, Bulletin 2. {{Taxonbar, from=Q1769409 Neotoma Fauna of the Sonoran Desert Fauna of the Southwestern United States Rodents of North America Mammals described in 1894 Taxonomy articles created by Polbot Desert fauna Xerophiles