| preference and aversion for deterrent chemicals in two species of peromyscus mouse. | deterrent chemicals such as quinine hydrochloride (qhc1) are generally considered to be aversive to mammals at all detectable concentrations. however, several species contain individuals that drink solutions containing low concentrations of deterrents in preference to plain water. the present study examines this paradoxical preference in two species of mouse, peromyscus melanotis and p. aztecus. preliminary findings had suggested that whereas some p. aztecus prefer low concentrations of qhc1, no ... | 1993 | 8327593 |
| comparative phylogeography of mesoamerican highland rodents: concerted versus independent response to past climatic fluctuations. | the phylogeography of sumichrast's harvest mouse (reithrodontomys sumichrasti) was examined through maximum-likelihood and parsimony analyses of 1,130 bp of mitochondrial cytochrome b sequence data from 43 individuals. the phylogeography of this middle american highland forest-dwelling species was compared to that previously published for the codistributed aztec deer mouse complex (peromyscus aztecus/peromyscus hylocetes complex) in order to test competing hypotheses of concerted versus independ ... | 2000 | 10805642 |
| ecology of hantaviruses in mexico: genetic identification of rodent host species and spillover infection. | in our recent epidemiological survey conducted in mexico for hantavirus infection, we identified three distinct viruses circulating in mexican wild rodents, namely montano virus (mtnv), huitzilac virus (huiv), and carrizal virus (carv). to gain a detailed understanding of hantavirus epidemiology and its associated hosts, 410 rodents were captured at eight collecting points in morelos and guerrero, mexico, and examined for hantavirus seroprevalence, the presence of viral rna, and rodent host spec ... | 2012 | 22750131 |
| lack of immunological responsiveness to photoperiod in a tropical rodent, peromyscus aztecus hylocetes. | non-tropical rodents undergo seasonal changes in immune function and disease. it has been hypothesized that seasonal fluctuations in immunity of non-tropical rodents are due to suppressed immune function during harsh winter conditions. a logical extension of this hypothesis is that seasonal changes in immunity should be reduced or absent in tropical rodents that do not experience marked seasonal fluctuations in environmental conditions; however this hypothesis remains to be tested. the present s ... | 2003 | 12624655 |
| phylogeography and molecular systematics of the peromyscus aztecus species group (rodentia: muridae) inferred using parsimony and likelihood. | mice of the peromyscus aztecus species group occur at mid to high elevations in several mountain ranges in the highlands of middle america (mexico and central america), a region of high endemicity. we examined the biogeography of this group by conducting phylogenetic analyses of 668 bp of the mitochondrial cytochrome b (cyt b) gene. phylogenetic analyses under both parsimony and likelihood frameworks produced the same topologies, but estimates of nodal support were artificially high in weighted ... | 1997 | 11975329 |
| social, but not photoperiodic, influences on reproductive function in male peromyscus aztecus. | nontropical rodents rely on environmental factors to restrict breeding to a specific time of the year. among these factors, photoperiod appears to be the primary environmental cue used for predicting optimal breeding conditions. the purpose of the present study was to characterize reproductive function, as well as photoperiodic and social responsiveness in male peromyscus aztecus, which occupy low-latitude, high-altitude habitats. in experiment 1, adult male p. aztecus were individually housed i ... | 1998 | 9475393 |