Global ETD Search

1	Habitat selection in kangaroo mice (Microdipodops) in three Nevadan populations Ghiselin, Jon Brewster. January 1967 (has links) Thesis (Ph. D.)--University of Wisconsin, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references. Heteromyidae. Pocket mice. Rodents
2	THE EFFECT OF SEED SIZE ON RESEEDING IN THE PRESENCE OF HETEROMYIDS (RODENTS, PREFERENCE). Standley, William George. January 1985 (has links) No description available. Revegetation -- Arizona. Heteromyidae -- Feeding and feeds.
3	Population Genetics of Kangaroo Mice, Microdipodops (Rodentia: Heteromyidae) Andersen, John 2012 May 1900 (has links) Dark (Microdipodops megacephalus) and pallid (Microdipodops pallidus) kangaroo mice are ecological specialists found in arid regions of the Great Basin Desert of the southwestern United States. Historical and current habitat alterations have resulted in disjunct distributions and severely diminished abundance of both species. Phylogenetic and phylogeographic research has discovered unique mitochondrial clades within M. megacephalus (eastern, central, western, and Idaho clades) and M. pallidus (eastern and western clades). Population-genetic analyses targeting the same mitochondrial markers also have found low amounts of maternal gene flow among the clades. However, little is known about population structure and genetic demography (historical and current migration rates, historical and current effective population sizes) within each mitochondrial clade. Herein, nuclear-encoded microsatellite loci were isolated to evaluate the underlying processes that may have molded kangaroo mouse relationships and distributions. Results from population-genetic analyses support previous findings that there are at least three genetically distinct clades within M. megacephalus and two such clades within M. pallidus. Three clades of M. megacephalus appear to have undergone different demographic histories, with little to no migration among clades. The two clades of M. pallidus also appear to have experienced varying demographic change although there has been small but recent migration between them. Additionally, the contemporary effective population sizes of all clades within Microdipodops appear to be low, suggesting that these populations may have difficulty coping with environmental pressures and hence are at risk of extinction. Results of this study are consistent with the recommendation that each Microdipodops clade should be managed as separate units and continually monitored in an effort to conserve these highly specialized taxa. Heteromyidae population genetics microsatellite conservation
4	Cytotaxonomy of the pocket mice, genus Peroganthus (Rodenta: Heteromyidae) Patton, James L. January 1965 (has links) No description available. Pocket mice -- Classification. Heteromyidae. Cytotaxonomy.
5	EVOLUTIONARY SIGNIFICANCE OF ADAPTATIONS IN HETEROMYID RODENTS IN BAJA CALIFORNIA, MEXICO Roth, Edward Lee, 1944- January 1976 (has links) No description available. Heteromyidae.
6	Locomotory Adaptations in Entoptychine Gophers (Rodentia: Geomyidae) and the Mosaic Evolution of Fossoriality Calede, Jonathan J.M., Samuels, Joshua X., Chen, Meng 01 June 2019 (has links) Pocket gophers (family Geomyidae) are the dominant burrowing rodents in North America today. Their fossil record is also incredibly rich; in particular, entoptychine gophers, a diverse extinct subfamily of the Geomyidae, are known from countless teeth and jaws from Oligocene and Miocene-aged deposits of the western United States and Mexico. Their postcranial remains, however, are much rarer and little studied. Yet, they offer the opportunity to investigate the locomotion of fossil gophers, shed light on the evolution of fossoriality, and enable ecomorphological comparisons with contemporaneous rodents. We present herein a quantitative study of the cranial and postcranial remains of eight different species of entoptychine gophers as well as many contemporary rodent species. We find a range of burrowing capabilities within Entoptychinae, including semifossorial scratch-digging animals and fossorial taxa with cranial adaptations to burrowing. Our results suggest the repeated evolution of chisel-tooth digging across genera. Comparisons between entoptychine gophers and contemporaneous rodent taxa show little ecomorphological overlap and suggest that the succession of burrowing rodent taxa on the landscape may have had more to do with habitat partitioning than competition. burrowing Castoridae ecomorphology functional morphology Heteromyidae resource partitioning Geosciences
7	The Effects of Artificial Water Sources on Small Mammal Communities January 2013 (has links) abstract: Modified and artificial water sources can be used as a management tool for game and non-game wildlife species. State, federal, and private agencies allocate significant resources to install and maintain artificial water sources (AWS) annually. Capture mark recapture methods were used to sample small mammal communities in the vicinity of five AWS and five paired control sites (treatments) in the surrounding Sonoran desert from October 2011 to May 2012. I measured plant species richness, density, and percent cover in the spring of 2012. A Multi-response Permutation Procedure was used to identify differences in small mammal community abundance, biomass, and species richness by season and treatment. I used Principle Component Analysis to reduce 11 habitat characteristics to five habitat factors. I related rodent occurrence to habitat characteristics using multiple and logistic regression. A total of 370 individual mammals representing three genera and eight species of rodents were captured across 4800 trap nights. Desert pocket mouse (Chaetodipus penicillatus) was the most common species in both seasons and treatments. Whereas rodent community abundance, biomass, and richness were similar between seasons, community variables of AWS were greater than CS. Rodent diversity was similar between treatments. Desert pocket mouse abundance and biomass were twice as high at AWS when compared to controls. Biomass of white-throated woodrat (Neotoma albigula) was five times greater at AWS. Habitat characteristics were similar between treatments. Neither presence of water nor distance to water explained substantial habitat variation. Occurrence of rodent species was associated with habitat characteristics. Desert rodent communities are adapted for arid environments (i.e. Heteromyids) and are not dependent on "free water". Higher abundances of desert pocket mouse at AWS were most likely related to increased disturbance and debris and not the presence of water. The results of this study and previous studies suggest that more investigation is needed and that short term studies may not be able to detect interactions (if any) between AWS and desert small mammal communities. / Dissertation/Thesis / M.S. Applied Biological Sciences 2013 Biology Animal sciences Ecology abundance artificial water sources habitat Heteromyidae small mammals Sonoran desert
8	Caching rodents disproportionately disperse seed beneath invasive grass Sommers, Pacifica, Chesson, Peter 07 February 2017 (has links) Seed dispersal by caching rodents is a context-dependent mutualism in many systems. Plants benefit when seed remaining in shallow caches germinates before being eaten, often gaining protection from beetles and a favorable microsite in the process. Caching in highly unfavorable microsites, conversely, could undermine the dispersal benefit for the plant. Plant invasions could disrupt dispersal benefits of seed caching by attracting rodents to the protection of a dense invasive canopy which inhibits the establishment of native seedlings beneath it. To determine whether rodents disproportionately cache seed under the dense canopy of an invasive grass in southeastern Arizona, we used nontoxic fluorescent powder and ultraviolet light to locate caches of seed offered to rodents in the field. We fitted a general habitat-use model, which showed that disproportionate use of plant cover by caching rodents (principally Chaetodipus spp.) increased with moonlight. Across all moon phases, when rodents cached under plants, they cached under the invasive grass disproportionately to its relative cover. A greenhouse experiment showed that proximity to the invasive grass reduced the growth and survival of seedlings of a common native tree (Parkinsonia microphylla) whose seeds are dispersed by caching rodents. Biased dispersal of native seed to the base of an invasive grass could magnify the competitive effect of this grass on native plants, further reducing their recruitment and magnifying the effect of the invasion. cache Chaetodipus baileyi Chaetodipus intermedius Heteromyidae invasion mutualism disruption Neotoma albigula Parkinsonia microphylla Pennisetum ciliare predator avoidance Sonoran Desert
9	Aplodontid, sciurid, castorid, zapodid and geomyoid rodents of the Rodent Hill locality, Cypress Hills formation, southwest Saskatchewan Bell, Sean Daniel 23 December 2004 The Rodent Hill Locality is a fossil-bearing site that is part of the Cypress Hills Formation, and is located roughly 15 km northwest of the town of Eastend, Saskatchewan. A number of fossil mammal and other vertebrate taxa are present at Rodent Hill; the primary objective of this project was to identify the fossil rodents of the families Sciuridae, Aplodontidae, Castoridae, Heliscomyidae, Heteromyidae, Florentiamyidae and Zapodidae. These taxa were correlated with rodents from other North American faunas to establish the age of the Rodent Hill Locality. <p>The species Haplomys cf. H. liolophus, Dakotallomys cf. D. pelycomyoides, Kirkomys milleri, Proheteromys nebraskensis, Agnotocastor cf. A. praetereadens, and possibly Cedromus cf. C. wilsoni support the Whitneyan age designation of the Rodent Hill Locality. Taxa that are described from Rodent Hill that are better known from earlier-age sites include Heliscomys vetus and H. hatcheri, Ecclesimus sp. and Oligotheriomys sp. Taxa that are younger than Whitneyan but have been recovered at Rodent Hill include Parallomys sp., Plesiosminthus sp., Protospermophilus sp., and Nototamias sp. Two new species in the genus Sciurion, and one new species in the genus Pseudallomys are described, and a new species of Heliscomys is identified but not formally named. <p>The rodents from the Rodent Hill Locality support the Whitneyan age assignment of the site. This is based on the presence of Whitneyan taxa, and the in situ co-occurrence of older and younger taxa within the site. Dakotallomys Pseudallomys Agnotocastor Oligotheriomys Palaeocastorinae Geomyoidea Heliscomyidae Heliscomys Heliscomys vetus Heliscomys hatcheri Syphyriomys Florentiamyidae Kirkomys Kirkomys milleri Ecclesimus Heteromyidae Proheteromys Proheteromys nebraskensis Sciuridae Parallomys Sciurion Castoridae Nototamias Protospermophilus Haplomys Campestrallomys Prosciurus Aplodontidae Cedromus Plesiosminthus Zapodidae North America Oligocene Whitneyan
10	Aplodontid, sciurid, castorid, zapodid and geomyoid rodents of the Rodent Hill locality, Cypress Hills formation, southwest Saskatchewan Bell, Sean Daniel 23 December 2004 (has links) The Rodent Hill Locality is a fossil-bearing site that is part of the Cypress Hills Formation, and is located roughly 15 km northwest of the town of Eastend, Saskatchewan. A number of fossil mammal and other vertebrate taxa are present at Rodent Hill; the primary objective of this project was to identify the fossil rodents of the families Sciuridae, Aplodontidae, Castoridae, Heliscomyidae, Heteromyidae, Florentiamyidae and Zapodidae. These taxa were correlated with rodents from other North American faunas to establish the age of the Rodent Hill Locality. <p>The species Haplomys cf. H. liolophus, Dakotallomys cf. D. pelycomyoides, Kirkomys milleri, Proheteromys nebraskensis, Agnotocastor cf. A. praetereadens, and possibly Cedromus cf. C. wilsoni support the Whitneyan age designation of the Rodent Hill Locality. Taxa that are described from Rodent Hill that are better known from earlier-age sites include Heliscomys vetus and H. hatcheri, Ecclesimus sp. and Oligotheriomys sp. Taxa that are younger than Whitneyan but have been recovered at Rodent Hill include Parallomys sp., Plesiosminthus sp., Protospermophilus sp., and Nototamias sp. Two new species in the genus Sciurion, and one new species in the genus Pseudallomys are described, and a new species of Heliscomys is identified but not formally named. <p>The rodents from the Rodent Hill Locality support the Whitneyan age assignment of the site. This is based on the presence of Whitneyan taxa, and the in situ co-occurrence of older and younger taxa within the site. Dakotallomys Pseudallomys Agnotocastor Oligotheriomys Palaeocastorinae Geomyoidea Heliscomyidae Heliscomys Heliscomys vetus Heliscomys hatcheri Syphyriomys Florentiamyidae Kirkomys Kirkomys milleri Ecclesimus Heteromyidae Proheteromys Proheteromys nebraskensis Sciuridae Parallomys Sciurion Castoridae Nototamias Protospermophilus Haplomys Campestrallomys Prosciurus Aplodontidae Cedromus Plesiosminthus Zapodidae North America Oligocene Whitneyan

Search results