| seed preference and buried seed retrieval of dipodomys deserti. | | 1971 | 5545559 |
| changes in the thermal characteristics of hypothalamic neurons during sleep and wakefulness. | the characteristics of the mammalian thermoregulatory system are dependent upon arousal state. during nrem sleep thermoregulatory mechanisms are intact but body temperature is regulated at a lower level than during wakefulness. in rem sleep thermoregulatory effector mechanisms are inhibited and thermal homeostasis is severely disrupted. thermosensitivity of neurons in the preoptic/anterior hypothalamus (poah) was determined for behaving kangaroo rats (dipodomys deserti) during electrophysiologic ... | 1984 | 6488008 |
| spatial memory in the desert kangaroo rat (dipodomys deserti). | desert kangaroo rats (dipodomys deserti) forage for seed distributed in patches in the desert environment and may remember patch locations. in experiment 1, 7 desert kangaroo rats that had discovered the location of a plastic token in 1 box accurately dug for a token hidden in the same location in a 2nd identical box. results of experiment 2 indicated that the rats primarily remembered the spatial location of the token within the box in relation to extramaze objects and the walls of the experime ... | 1994 | 8174344 |
| kangaroo rats exhibit spongiform degeneration of the central auditory system similar to that found in gerbils. | kangaroo rats develop spongiform degeneration of the central auditory system similar to that seen in the gerbil. light microscopic and transmission electron microscopic study of the cochlear nucleus and auditory nerve root (anr) of dipodomys deserti and d. merriami show that spongiform lesions develop in dendrites and oligodendrocytes of the cochlear nucleus and in oligodendrocytes of the anr that are morphologically indistinguishable from those extensively described in the mongolian gerbil, mer ... | 1997 | 9119769 |
| species-specific footdrumming in kangaroo rats: dipodomys ingens, d. deserti, d. spectabilis | footdrumming was compared in three allopatric species of kangaroo rat, dipodomysfrom three habitats. analysis of footdrumming recordings revealed species-specific patterns of drumming ranging from single thumps to individual footdrumming signatures. the desert kangaroo rat, d. desertidrums single thumps spaced 0.25-0.30 s apart that are sometimes introduced with a short footroll. the giant kangaroo rat, d. ingensdrums long footrolls that can average over 100 drums at 18 drums/s. the banner-taile ... | 1997 | 9398370 |
| absence of aquaporin-4 water channels from kidneys of the desert rodent dipodomys merriami merriami. | recently, we found that aquaporin-4 (aqp4) is expressed in the s3 segment of renal proximal tubules of mice but not in rat proximal tubules. because mice have relatively larger papillae than rats, it was proposed that the renal distribution of aqp4 in various species could be related to their maximum urinary concentrating ability. therefore, kidneys and other tissues of merriam's desert kangaroo rat, dipodomys merriami merriami, which produce extremely concentrated urine (up to 5,000 mosmol/kgh( ... | 2001 | 11292621 |
| how does the ecological foraging behavior of desert kangaroo rats (dipodomys deserti) relate to their behavior on radial mazes? | experiment 1 showed that laboratory-reared desert kangaroo rats, like domestic norway rats, efficiently search for food on a radial arm maze (ram) by avoiding revisiting arms within a trial. by placing an ram on the floor so the animals could approach food from any direction, experiment 2 tested whether efficient search by kangaroo rats was based on tactics of distance minimizing, central-place foraging, trail following, or meandering. in contrast to the dominant trail-following tactic of domest ... | 2002 | 12593326 |
| a comparative study of growth and development of the kangaroo rats, dipodomys deserti stephens and dipodomy's merriami mearns. | | 1961 | 13689478 |
| effects of high sodium diet and of high potassium diet on the adrenals and kidney of the desert kangaroo rat and domestic albino rat. | | 1949 | 15407706 |
| short interspersed elements (sines) of the geomyoidea superfamily rodents. | a new short interspersed element (sine) was isolated from the genome of desert kangaroo rat (dipodomys deserti) using single-primer pcr. this sine consists of two monomers: the left monomer (idl) resembles rodent id element and other trnaala(cgc)-derived sines, whereas the right one (geo) shows no similarity with known sine sequences. pcr and hybridization analyses demonstrated that idl-geo sine is restricted to the rodent superfamily geomyoidea (families geomyidea and heteromyidea). isolation a ... | 2006 | 16517098 |
| kinematic analysis of an appetitive food-handling behavior: the functional morphology of syrian hamster cheek pouches. | prodigious food hoarding in syrian hamsters mesocricetus auratus waterhouse is strongly linked to appetite and is made possible by large internal cheek pouches. we provide a functional analysis of the cheek pouch and its associated retractor muscle. frame-by-frame analysis of videotaped pouch-filling behavior revealed multiple jaw cycles for each food item pouched and the use of more jaw cycles to pouch large food items ( approximately 2.5 g chow pellets) than small (corn kernels or sunflower se ... | 2007 | 17704084 |
| chihuahuan desert kangaroo rats: nonlinear effects of population dynamics, competition, and rainfall. | using long-term data on two kangaroo rats in the chihuahuan desert of north america, we fitted logistic models including the exogenous effects of seasonal rainfall patterns. our aim was to test the effects of intraspecific interactions and seasonal rainfall in explaining and predicting the numerical fluctuations of these two kangaroo rats. we found that logistic models fit both data sets quite well; dipodomys merriami showed lower maximum per capita growth rates than dipodomys ordii, and in both ... | 2008 | 18831180 |
| genetic consequences of postglacial range expansion in two codistributed rodents (genus dipodomys) depend on ecology and genetic locus. | how does range expansion affect genetic diversity in species with different ecologies, and do different types of genetic markers lead to different conclusions? we addressed these questions by assessing the genetic consequences of postglacial range expansion using mitochondrial dna (mtdna) and nuclear restriction site-associated dna (rad) sequencing in two congeneric and codistributed rodents with different ecological characteristics: the desert kangaroo rat (dipodomys deserti), a sand specialist ... | 2015 | 25413968 |
| patch use by dipodomys deserti (rodentia: heteromyidae): profitability, preference, and depletion dynamics. | granivorous desert rodents of the family heteromyidae forage nonrandomly among "microhabitats" that vary in substrate, seed densities, and seed species composition. to explore the hypothesis that microhabitat use is sensitive to seed patch profitability, we quantified effects of seed size (1.96 vs. 5.21 mg/seed) and density (0.4-10.6 seeds/cm(2)) on dipodomys deserti harvest rates, which is a measure of profitability when expressed as mg of seed taken per min. by manipulating seed density, we cr ... | 1990 | 28313247 |
| effects of seed distribution and competitors on seed harvesting efficiency in heteromyid rodents. | the foraging strategies of four naturally co-existing heteromyid rodent species were investigated: dipodomys deserti (≈100 g), d. merriami (≈38 g), microdipodops pallidus (≈13 g), and perognathus longimembris (≈7 g). in 208 over-night laboratory foraging trials animals were provided with millet seed distributed in clumped and scattered patterns. net removal of seeds from the foraging arena and amounts of seeds in cheek pouches and in caches were determined. when alone in an areana none of these ... | 1979 | 28310290 |
| collision-based mechanics of bipedal hopping. | the muscle work required to sustain steady-speed locomotion depends largely upon the mechanical energy needed to redirect the centre of mass and the degree to which this energy can be stored and returned elastically. previous studies have found that large bipedal hoppers can elastically store and return a large fraction of the energy required to hop, whereas small bipedal hoppers can only elastically store and return a relatively small fraction. here, we consider the extent to which large and sm ... | 2013 | 23843217 |
| elemental and radionuclide exposures and uptakes by small rodents, invertebrates, and vegetation at active and post-production uranium mines in the grand canyon watershed. | the effects of breccia pipe uranium mining in the grand canyon watershed (arizona) on ecological and cultural resources are largely unknown. we characterized the exposure of biota to uranium and co-occurring ore body elements during active ore production and at a site where ore production had recently concluded. our results indicate that biota have taken up uranium and other elements (e.g., arsenic, cadmium, copper, molybdenum, uranium) from exposure to ore and surficial contamination, like blow ... | 2020 | 32835973 |
| derived muscle arrangements and their shared innervation patterns of external and internal cheek pouches in rodents. | cheek pouches have evolved from the oral cavity in rodents and act as temporary food storage repositories. there are two types of opening, internal and external. details about the complex cutaneous muscles controlling the pouches have still not been fully elucidated. to understand the shared and derived traits of the muscles surrounding the cheek pouch and their innervation, we carried out an evolutionary morphological study using two desert kangaroo rats (dipodomys deserti) and three plains poc ... | 2020 | 31502343 |
| jumping mechanics of desert kangaroo rats. | kangaroo rats are small bipedal desert rodents that use erratic vertical jumps to escape predator strikes. in this study we examined how individual hind limb joints of desert kangaroo rats (dipodomys deserti) power vertical jumps across a range of heights. we hypothesized that increases in net work would be equally divided across hind limb joints with increases in jump height. to test this hypothesis, we used an inverse dynamics analysis to quantify the mechanical output from the hind limb joint ... | 2018 | 30420493 |
| functional capacity of kangaroo rat hindlimbs: adaptations for locomotor performance. | many cursorial and large hopping species are extremely efficient locomotors with various morphological adaptations believed to reduce mechanical demand and improve movement efficiency, including elongated distal limb segments. however, despite having elongated limbs, small hoppers such as desert kangaroo rats (dipodomys deserti) are less efficient locomotors than their larger counterparts, which may be in part due to avoiding predators through explosive jumping movements. despite potentially con ... | 2018 | 29997260 |