| binding of anti-nucleoside antibodies reveals different classes of dna in the chromosomes of the kangaroo rat (dipodomys ordii). | | 1977 | 70368 |
| an anatomical study of the brains of dipodomys (mammalia: rodentia: heteromyidae). | whole brains and nissl-stained serial sections of 3 species of kangaroo rat (dipodomys spectabilis, d. ordii, d. merriami) were compared for interspecific differences. neuroanatomical variations were conservative in nature. examination of the cerebellum revealed possible differences in locomotion and ecology. dipodomys ordii exhibited more neurological evidence for increased specialization of the hindlimbs, while d. merriami had the least differentiated cerebellar surface, thereby suggesting mor ... | 1979 | 507367 |
| nucleotide sequences of hs-alpha satellite dna from kangaroo rat dipodomys ordii and characterization of similar sequences in other rodents. | | 1977 | 597857 |
| the endogenous stages of eimeria utahensis (protozoa: eimeriidae) in the kangaroo rat, dipodomys ordii. | the endogenous life cycle of eimeria utahensis is described from experimentally infected kangaroo rats, dipodomys ordii. the endogenous asexual cycle consisted of 4 generations of meronts. first-generation meronts were concentrated in the anterior third of the small intestine. the succeeding generations of meronts and the sexual stages were concentrated in the middle third of the small intestine. first-generation meronts had a mean diameter of 9.7 micrometer and contained 12 to 16 merozoites. se ... | 1978 | 627970 |
| analysis of the frequency of sister chromatid exchange in different regions of chromosomes of the kangaroo rat (dipodomys ordii). | the frequency of sister chromatid exchanges (sces) has been determined for c band and non-c band regions of chromosomes of the kangaroo rat after staining with the fluorescence plus giemsa (fpg) technique. after one complete round of dna synthesis in the presence of bromodeoxyuridine (brdu) staining of the c band regions revealed simple or complex asymmetries between chromatids. after two complete rounds of dna synthesis in the presence of brdu "harlequin" chromosomes were observed. analysis of ... | 1976 | 964105 |
| investigation of the organization of mammalian chromosomes at the dna sequence level. | new developments in dna sequencing techniques permit rapid progress in the determination of both repetitious and single-copy mammalian sequences. three distinct families of highly repetitious satellite dna's from the kangaroo rat dipodomys ordii have been sequenced. with the ms satellite it was possible to show that the basic repeat sequence and its variants were arranged in a nonrandom order suggesting a hierarchy of repeats. the hs-alpha satellite from d. ordii was shown to resemble the guinea ... | 1976 | 1107072 |
| consumption and mortality of the white-footed mouse (rodentia: muridae) and ord's kangaroo rat (rodentia: heteromyidae) when fed carbaryl-bran grasshopper (orthoptera) bait. | two species of wild rodents (ord's kangaroo rat, dipodomys ordii woodhouse, and the white-footed mouse, peromyscus leucopus rafinesque) were fed 0, 2, and 20% (ai) by weight concentrations of carbaryl-bran grasshopper bait in the laboratory to determine whether the bait would be consumed, the total quantity of bait consumed within a specified period, whether mortality would occur, and whether bait would be consumed if other foods were readily available. consumption tests showed that bait ingesti ... | 1990 | 2126269 |
| the sequence of the 3.3-kilobase repetitive element from dipodomys ordii suggests a mechanism for its amplification and interspersion. | dna from the kangaroo rat, dipodomys ordii, contains a 3.3-kb, highly repeated sequence that is interspersed throughout the genome in small tandem clusters. one 3.3-kb unit has been cloned into pbr322 and the nucleotide sequence determined. the clone used was shown to be representative of the bulk of such sequences found in the genomic dna. the sequence contains 10 homologous subunits each ca. 260 bp in length. comparison of these to one another yielded a 258-bp consensus sequence containing a 3 ... | 1987 | 3041011 |
| genomic structure and sequence variation of a 3.3-kb repeat dna element of the kangaroo rat, dipodomys ordii. | the genomic structure and sequence variation of a 3.3-kb repeat dna element, representing 5% of the genome of the kangaroo rat dipodomys ordii, has been investigated. most of the repeats are arranged in tandem arrays of 50 kb or more. thirteen randomly selected genomic clones have been mapped with twelve restriction enzymes. the frequency of sequence divergence in the genomic clones is 0.5%. the clone maps and the genomic structure studies have permitted the characterization of a number of varia ... | 1988 | 3215518 |
| vertical distribution of soil removed by four species of burrowing rodents in disturbed and undisturbed soils. | burrow volumes were determined in disturbed and undisturbed soils for four species of rodents in southeastern idaho. comparisons were made between soil types for the average volume and the proportion of the total volume of soil excavated from 10-cm increments for each species, and the relative number of burrows and proportion of total soil removed from beneath the minimum thickness of soil covers over buried low-level radioactive wastes. burrows of montane voles (microtus montanus) and deer mice ... | 1988 | 3280518 |
| thermoregulatory responses to photoperiod by kangaroo rats (dipodomys ordii): influence of night lighting on nonshivering thermogenesis and resting metabolism. | the influence of photoperiod on resting oxygen consumption and nonshivering thermogenesis of winter-acclimatized kangaroo rats was determined by exposing freshly captured animals to 10-week controlled photoperiod treatments. three treatments were employed: 1) long days (ld) = 16l:8d, 2) short days (sd) = 8l:16d, and 3) short days interrupted with 15 min light at midnight (sdl). thermoneutral oxygen consumption was uninfluenced by treatment, and posttreatment values were not different from pretre ... | 1985 | 4056675 |
| helminths of sympatric populations of kangaroo rats (dipodomys ordii) and grasshopper mice (onychomys leucogaster) from the high plains of eastern new mexico. | during a 1-yr period 124 dipodomys ordii and 92 onychomys leucogaster were trapped from the same locality and were examined for helminths. only 1 cestode species (catenotaenia linsdalei) was recovered from d. ordii, whereas o. leucogaster was infected with 2 nematoda (litomosoides carinii, mastophorus muris), 2 cestoda (hymenolepis citelli, and 1 unknown), and 1 acanthocephalan (moniliformis clarki) species. all represent new host and distribution records. | 1985 | 4057002 |
| timing of replication of the satellite and main band dnas in cells of the kangaroo rat (dipodomys ordii). | | 1972 | 4117038 |
| location of satellite dnas in the chromosomes of the kangaroo rat (dipodomys ordii). | | 1973 | 4125443 |
| nucleotide sequence of hs-beta satellite dna from kangaroo rat dipodomys ordii. | the sequence of the highly repetitive satellite hs-beta dna fraction from kangaroo rat dipodomys ordii was determined independently by rna and dna sequencing techniques. a basic iterated sequence of 10 nucleotides with several mutational variations was found. base-composition data are consistent with the proposed sequence and revealed a high content of 5-methylcytosine. dna and rna sequencing techniques used gave identical results, showing that the fidelity of synthesis of riboguanidine-substitu ... | 1973 | 4517675 |
| nutrition requirements of the kangaroo rat (dipodomys ordii) as indicated by dietary self-selection. | | 1972 | 5035252 |
| population variation in dipodomys ordii from western texas. | | 1971 | 5545551 |
| eimeria balphae n. sp. from the ord kangaroo rat dipodomys ordii. | | 1967 | 5629072 |
| eimeria scholtysecki n. sp. from ord's kangaroo rat dipodomys ordii. | | 1967 | 6038029 |
| the red function of phage lambda mediates the alteration of an interspersed repeated dna sequence from the kangaroo rat dipodomys ordii. | the kangaroo rat d. ordii is shown to contain an interspersed repeated sequence 3.25 kb in length. this sequence undergoes alteration (deletions) when cloned into a red+ lambda vector but is stable in a red- vector. using the red- clone it is shown that deletions are the result of the activity of the lambda red, or e. coli rece, recombination systems. mixed infection experiments demonstrate that this activity is acting in trans. the deletions appear to yield fragments of specific size, suggestin ... | 1982 | 6294479 |
| kangaroo rat bone compared to white rat bone after short-term disuse and exercise. | kangaroo rats (dipodomys ordii) were used to study the effects of confinement on mechanical properties of bone with a long range objective of proposing an alternative to the white rat model for the study of disuse osteoporosis. kangaroo rats exhibit bipedal locomotion, which subjects their limbs to substantial accelerative forces in addition to the normal stress of weight bearing. we subjected groups of kangaroo rats and white rats (rattus norvegicus) to one of two confinement treatments or to a ... | 1996 | 8759284 |
| botfly (diptera:oestridae) parasitism of ord's kangaroo rats (dipodomys ordii) at suffield national wildlife area, alberta, canada. | during field study of ord's kangaroo rat (dipodomys ordii) at suffield national wildlife area, alberta, canada, a high prevalence of parasitism by botfly (diptera: oestridae) larvae was observed. botflies have not previously been documented as parasites of kangaroo rats. botfly parasitism could have a significant impact on the growth, survival, and reproduction of ord's kangaroo rat, which is considered a vulnerable species in canada. therefore, it is important to investigate how botfly parasiti ... | 1997 | 9267398 |
| hemorrhagic gastritis in free-living rodents in idaho. | between february 1992 and march 1994, four species of rodent from the snake river birds of prey area near boise, idaho (usa) were necropsied. hemorrhagic gastritis was observed in 16 of 131 townsend's ground squirrels (spermophilus townsendii), one of 11 ord's kangaroo rats (dipodomys ordii) and the one great basin pocket mouse (perognathus parvus) evaluated. no lesions were observed in 14 white-footed deer mice (peromyscus maniculatus). tissue from one townsend's ground squirrel was negative fo ... | 1996 | 9359067 |
| small mammal survival and trapability in mark-recapture monitoring programs for hantavirus. | following the 1993 hantavirus pulmonary syndrome (hps) epidemic in the south-western united states, mammalogists and epidemiologists instituted long-term studies to monitor population density and prevalence of infection in rodents which constitute the reservoir for sin nombre virus (snv). in this study, field techniques used in sampling small mammals for snv infection were evaluated to determine if trapping and handling protocols were having significant effects on future trapability or mortality ... | 1998 | 9476220 |
| fractionation and characterization of satellite dnas of the kangaroo rat (dipodomys ordii). | nuclear dna from liver cells of the kangaroo rat species dipodomysordii was fractionated and characterized with the aid of buoyant density gradients in neutral and alkaline cscl and in ag(+)-cs(2)so(4). more than one-half of the dna was present in three density satellites, a greater proportion than in any other species yet reported; the purified satellite dnas were denser than principal dna. all satellite fractions revealed sharp isopycnic bands and narrow denaturation profiles. two had identica ... | 1974 | 10793740 |
| host usage and seasonal activity patterns of ixodes kingi and i. sculptus (acari: ixodidae) nymphs in a colorado prairie landscape, with a summary of published north american host records for all life stages. | we examined host usage and seasonal activity patterns of the nymphal stage of the ticks ixodes kingi and i. sculptus within a prairie rodent community in north-central colorado. ixodes kingi was commonly encountered on both northern grasshopper mice (onychomys leucogaster) and thirteen-lined ground squirrels (spermophilus tridecemlineatus), whereas i. sculptus frequently infested s. tridecemlineatus but was absent from o. leucogaster. low numbers of ticks of both species were collected from deer ... | 2006 | 16859106 |
| 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 |
| characterization of expressed class ii mhc sequences in the banner-tailed kangaroo rat (dipodomys spectabilis) reveals multiple drb loci. | genes of the major histocompatibility complex (mhc) are exceptionally polymorphic due to the combined effects of natural and sexual selection. most research in wild populations has focused on the second exon of a single class ii locus (drb), but complete gene sequences can provide an illuminating backdrop for studies of intragenic selection, recombination, and organization. to this end, we characterized class ii loci in the banner-tailed kangaroo rat (dipodomys spectabilis). seven drb-like seque ... | 2008 | 18836711 |
| sin nombre virus and rodent species diversity: a test of the dilution and amplification hypotheses. | species diversity is proposed to greatly impact the prevalence of pathogens. two predominant hypotheses, the "dilution effect" and the "amplification effect", predict divergent outcomes with respect to the impact of species diversity. the dilution effect predicts that pathogen prevalence will be negatively correlated with increased species diversity, while the amplification effect predicts that pathogen prevalence will be positively correlated with diversity. for many host-pathogen systems, the ... | 2009 | 19649283 |
| a stable, "near-haploid" mammalian cell line (dipodomys ordii). | | 2003 | 193702 |
| species' traits help predict small mammal responses to habitat homogenization by an invasive grass. | invasive plants can negatively affect native species, however, the strength, direction, and shape of responses may vary depending on the type of habitat alteration and the natural history of native species. to prioritize conservation of vulnerable species, it is therefore critical to effectively predict species' responses to invasive plants, which may be facilitated by a framework based on species' traits. we studied the population and community responses of small mammals and changes in habitat ... | 2017 | 28317278 |
| the motilin gene evolved a new function in kangaroo rats and kangaroo mice (dipodomyinae). | the motilin receptor gene was lost in the ancestral lineage of rodents. subsequently, the gene encoding its ligand, motilin, has experienced different evolutionary fates. previous genomic analyses had shown that the motilin gene (mln) became a pseudogene independently in the lineages leading to the guinea pig and the common ancestor of the mouse and rat, yet an intact, and thus potentially functional, open reading frame for the mln was preserved in the dipodomys ordii genome. as only a single ml ... | 2012 | 23138633 |
| nematofauna of rodents of the families heteromyidae and cricetidae from the mexican plateau. | as a part of an ongoing project to inventory the helminth parasites of rodents in mexico, 85 specimens of 2 families of rodents were collected from the mexican plateau: cricetidae ( neotoma sp., neotoma leucodon , onychomys arenicola , peromyscus sp., peromyscus eremicus , and reithrodontomys sp.) and heteromyidae ( chaetodipus sp., chaetodipus eremicus , chaetodipus hispidus , dipodomys merriami , dipodomys ordii , dipodomys ornatus, dipodomys spectabilis , liomys irroratus , perognathus sp., a ... | 2017 | 27788020 |
| bacula of dipodomys ordii compactus and dipodomys elator. | | 1976 | 932573 |
| perturbation analysis of competition and overlap in habitat utilization between dipodomys ordii and dipodomys merriami. | the populations of two coexisting species of dipodomys (heteromyidae, rodentia) were manipulated on 10, large, unenclosed, trapping grids. these manipulations revealed that, although many kangaroo rats are established residents in an area, a large number are transient individuals who quickly occupy vacated habitats. on plots from which residents had been removed, transients settled at rates of up to 5% of carrying capacity per day. these immigrants were invariably of the same species that was re ... | 1975 | 28308827 |
| a mast-seeding desert shrub regulates population dynamics and behavior of its heteromyid dispersers. | granivorous rodent populations in deserts are primarily regulated through precipitation-driven resource pulses rather than pulses associated with mast-seeding, a pattern more common in mesic habitats. we studied heteromyid responses to mast-seeding in the desert shrub blackbrush (coleogyne ramosissima), a regionally dominant species in the mojave-great basin desert transition zone. in a 5-year study at arches national park, utah, usa, we quantified spatiotemporal variation in seed resources in m ... | 2016 | 27069574 |
| the complete mitochondrial genome of the dipodomys ordii (ord's kangaroo rat). | ord's kangaroo rat is a kangaroo rat native to western north america. in this study, we first reported the complete mitochondrial genome of dipodomys ordii that the first has the complete mitochondrial genome in the genus of heteromyidae. the mitogenome is a circular molecule of 16 257 bp in length, containing 13 protein-coding genes, 2 ribosomal rnas, 22 transfer rnas and a putative displacement loop region. all protein-coding genes started with a traditional atn codon and terminated with the m ... | 2016 | 26486753 |
| divergence in sink contributions to population persistence. | population sinks present unique conservation challenges. the loss of individuals in sinks can compromise persistence; but conversely, sinks can improve viability by improving connectivity and facilitating the recolonization of vacant sources. to assess the contribution of sinks to regional population persistence of declining populations, we simulated source-sink dynamics for 3 very different endangered species: black-capped vireos (vireo atricapilla) at fort hood, texas, ord's kangaroo rats (dip ... | 2015 | 26032147 |
| mechanisms for the keystone status of kangaroo rats: graminivory rather than granivory? | graminivory by kangaroo rats (dipodomys spp.) was investigated as a potential mechanism for the keystone role of these rodents in the dynamics of desert grasslands. experiments confirmed that ord's kangaroo rats (dipodomys ordii) cut and consumed a large proportion of the tillers of three chihuahuan desert tussock-forming grass species. field observations indicated that the characteristically cut grass tillers were absent from all-rodent and medium-sized kangaroo rat exclosures, but were frequen ... | 1997 | 28308138 |
| the influence of seed apparency, nutrient content and chemical defenses on dietary preference in dipodomys ordii. | physical, nutritional and defensive qualities of seeds differ in the extent to which they influence granivore preference. in a study aimed to quantifying those differences, ord's kangaroo rats (dipodomys ordii) were found to prefer the seeds of just three of twenty-nine species: cryptantha crassisepala, oryzopsis hymenoides and salsola kali. oryzopsis hymenoides was most preferred during the early plant growth season (april-july); preference for s. kali peaked during late (august-november) and d ... | 1990 | 28312708 |
| competitive release in microhabitat use among coexisting desert rodents: a natural experiment. | competitive release among desert rodents on sand dunes of differing species richness was examined in the great basin and mohave deserts, usa. expansions in microhabitat use were exhibited by the kangaroo rats dipodomys ordii and d. merriami (granivorous heteromyid rodents, weighing 49 and 42 g, respectively) as the number of coexisting heteromyid species decreased geographically. perognathus longimembris, the only common small heteromyid species (7 g) exhibited no competitive release. this may b ... | 1986 | 28311364 |
| small mammal community ecology : changes in species diversity in response to manipulated productivity. | the abundance of food in natural 1-ha plot of shortgrass prairie was artificially manipulated by adding alfalfa pellets and whole oats on a regular schedule. the small mammal species naturally inhabiting the manipulated food plot did not respond in either their density or weight to the supplemented food. however, a new specialized seed-eating species, dipodomys ordii, invaded the food plot and persisted in relatively high density. as a result of this colonization, species diversity was significa ... | 1978 | 28309543 |
| a mechanism for resource allocation among sympatric heteromyid rodent species. | laboratory feeding experiments were conducted with dipodomys ordii and perognathus flavus in an attempt to discover a mechanism which might result in seed size selection. there was no marked difference in the proportions of four seed types collected whether the rodents foraged in the presence or absence of one another. however, analysis of the variability in weight of each of the seed types collected by the two species showed that when alone, the larger kangaroo rat was less effective at harvest ... | 1978 | 28309270 |
| a multispecies test of source-sink indicators to prioritize habitat for declining populations. | for species at risk of decline or extinction in source-sink systems, sources are an obvious target for habitat protection actions. however, the way in which source habitats are identified and prioritized can reduce the effectiveness of conservation actions. although sources and sinks are conceptually defined using both demographic and movement criteria, simplifications are often required in systems with limited data. to assess the conservation outcomes of alternative source metrics and resulting ... | 2017 | 29193292 |
| functional characterization of novel alox15 orthologs representing key steps in mammalian evolution supports the evolutionary hypothesis of reaction specificity. | arachidonic acid lipoxygenases (aloxs) are lipid-metabolizing enzymes that have been implicated in cell differentiation, but also in the pathogenesis of inflammatory, hyperproliferative and neurological diseases. most mammalian genomes involve six or seven functional alox genes and among the corresponding alox-isoforms the alox15 orthologs are somewhat unique since they exhibit variable reaction specificity using arachidonic acid as substrate. the evolutionary hypothesis of mammalian alox15 reac ... | 2019 | 30599203 |