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Determining Microhabitat Use By The Gulf Coast Kangaroo Rat Dipodomys Compactus Using Motion Sensitive Cameras And Estimating Population Density At Their Northern Distribution Limit
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Book Synopsis Determining Microhabitat Use by the Gulf Coast Kangaroo Rat (Dipodomys Compactus) Using Motion Sensitive Cameras and Estimating Population Density at Their Northern Distribution Limit by : Douglas W. Phillips
Download or read book Determining Microhabitat Use by the Gulf Coast Kangaroo Rat (Dipodomys Compactus) Using Motion Sensitive Cameras and Estimating Population Density at Their Northern Distribution Limit written by Douglas W. Phillips and published by . This book was released on 2012 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gulf Coast kangaroo rat (Dipodomys compactus) is a rarely studied species endemic to southern Texas. Throughout its range, it is intermittently distributed because of its presumed dependence on deep, sandy soils with sparse vegetation. I conducted my study in Guadalupe County, Texas, the northernmost limit of the species' distribution. I collected mark-recapture data during April, July, and September 2011 in order to estimate population density.
Book Synopsis Evaluation of Population Density and Characterization of Suitable Habitat for the Gulf-coast Kangaroo Rat (Dipodomys Compactus) by : Sean M. Rissel
Download or read book Evaluation of Population Density and Characterization of Suitable Habitat for the Gulf-coast Kangaroo Rat (Dipodomys Compactus) written by Sean M. Rissel and published by . This book was released on 2011 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gulf-coast kangaroo rat (Dipodomys compactus) is characteristic of the arid ecosystems of South Texas and the barrier islands. It is listed by Texas Parks and Wildlife Department as a species of concern and is the only member of the family Heteromyidae found on Mustang Island, North and South Padre islands, Texas, and the barrier islands of Tamaulipas, Mexico. I conducted my study at Padre Island National Seashore, to investigate this poorly understood species. I estimated population density and distribution, characterized burrow microhabitat, and used Geographic Information Systems (GIS) to compare transects with different kangaroo rat densities. Live-trapping using mark-recapture methodology was conducted for two periods between April 2010 and October 2010 along 12 transects. A variety of microhabitat characteristics of burrows were measured on active burrows. Trap success for the entire sampling period was 5%, but more individuals were caught during the spring sampling period than the fall sampling period. Using the Lincoln-Peterson index, I estimated a population density of 3.6 individuals per hectare. Active burrows differed significantly in slope, type of vegetative cover, and percent vegetative cover compared to paired random locations. Burrows were found in areas with a higher slope and less vegetative cover. Low trap success and coarse scale ecogeographical layers made development of a habitat suitability model difficult. A more intensive study over a longer time frame will be essential to effectively delineate habitat and predict population sizes--Abstract.
Book Synopsis Habitat Availability Assessment for the Gulf Coast Kangaroo Rat (Dipodomys Compactus) in South-central Texas by : Laura M Bliss
Download or read book Habitat Availability Assessment for the Gulf Coast Kangaroo Rat (Dipodomys Compactus) in South-central Texas written by Laura M Bliss and published by . This book was released on 2016 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the human population increases worldwide, urbanization, habitat destruction, and habitat modification also increase. Recently the urbanization rate in Central Texas has become one of the highest in the nation. The consequential loss of natural habitat could jeopardize native wildlife species that are already somewhat limited in their distribution. Based on specialized life-history traits that limit large-scale mobility, kangaroo rats (Dipodomys spp.) have been found to be especially sensitive to urbanization-induced habitat modification and fragmentation. Dipodomys compactus is one of five kangaroo rat species found in Texas; this species has narrow, specific habitat requirements. Using a geographic information system (GIS)-based habitat suitability model, I determined that due to isolation among suitable habitat patches, actual D. compactus range in south-central Texas is highly fragmented, and the particular population in south-central Texas may be more isolated than currently thought. The assessment strategy of GIS habitat mapping can be broadly applied to other vulnerable species with similarly narrow habitat parameters to predict current and future management requirements.
Book Synopsis Habitat Assessment of an Inland Population of the Gulf Coast Kangaroo Rat (Dipodomys Compactus) by : Jennifer P. Oakley
Download or read book Habitat Assessment of an Inland Population of the Gulf Coast Kangaroo Rat (Dipodomys Compactus) written by Jennifer P. Oakley and published by . This book was released on 2012 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: I conducted a habitat assessment on an inland population of the Gulf Coast kangaroo rat (Dipodomys compactus) located in Guadalupe County, Texas. Previous research on the Padre Island population of the Gulf Coast kangaroo rat has shown the species to inhabit open areas with deep sand and little vegetation, essentially barren sand dunes. However, this distinct habitat type does not occur inland and yet the species is found in certain areas of inland south Texas. The goal of my study was to determine if the northernmost known population of D. compactus retains the species affinity for deep sparsely-vegetated sand habitat. My study site was the Diamond Half Ranch consisting of approximately 2303.3 ha, located 16 km south of Seguin, Texas. In order to assess the habitat associations of this inland Gulf Coast kangaroo rat population, 57 points were semi-randomly located across the study site. At each of these points, I used the Daubenmire frame technique to record the percent of ground cover for grass, forbs, small woody plants, litter (dead herbaceous material), and bare substrate (soil, rock) within a 10 m circle centered on the point. I also recorded the average height of the tallest plants, the average tree canopy present at each point using a spherical densiometer, and the number of active (uncluttered opening, feces, tracks, etc) burrow openings. Data were collected in May 2011, August 2011, November 2011, and February 2012.
Book Synopsis Testing Camera Trap Density Estimates from the Spatial Capture Model and Calibrated Capture Rate Indices Against Kangaroo Rat (Dipodomys Spp.) Live Trapping Data by : Timothy A. Walker
Download or read book Testing Camera Trap Density Estimates from the Spatial Capture Model and Calibrated Capture Rate Indices Against Kangaroo Rat (Dipodomys Spp.) Live Trapping Data written by Timothy A. Walker and published by . This book was released on 2016 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Camera trapping studies often focus on estimating population density, which is critical for managing wild populations. Density estimators typically require unique markers such as stripe patterns to identify individuals but most animals do not have such markings. The spatial capture model (SC model; Chandler & Royle, 2013) estimates density without individual identification but lacks sufficient field testing. Here, both the SC model and calibrated capture rate indices were compared against ten sessions of live trapping data on kangaroo rats (Dipodomys spp). These camera and live trapping data were combined in a joint-likelihood model to further compare the two methods. From these comparisons, the factors governing the SC model’s success were scrutinized. Additionally, a method for estimating missed captures was developed and tested here. Regressions comparing live trapping density to the SC model density and capture rate were significant only for the capture rate comparison. Missed image rate had a significant relationship with ambient nighttime temperatures but only marginally improved the capture rate index calibration. Results showed the SC model was highly sensitive to deviations from its movement model, producing potentially misleading results. The model may be effective only when movement assumptions hold. Several factors such as camera coverage area, microhabitat, and burrow locations could be incorporated into the SC model density estimation process to improve precision and inference.
Book Synopsis North American Rodents by : David J. Hafner
Download or read book North American Rodents written by David J. Hafner and published by IUCN. This book was released on 1998 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive treatment of North American rodents of conservation concern. This action plan summarizes the rodent fauna of North America and provides available information on every rodent taxon that has been considered to be of conservation concern by state, provincial and private conservation agencies and regional experts. It is hoped that the survey provided in this action plan will serve as a common ground for all these parties in drawing up conservation strategies for rodents.
Book Synopsis Comparison of Fine Scale Vegetative Parameters at Active and Inactive Gulf Coast Kangaroo Rat Burrow Sites by : Meagan Marie Bell
Download or read book Comparison of Fine Scale Vegetative Parameters at Active and Inactive Gulf Coast Kangaroo Rat Burrow Sites written by Meagan Marie Bell and published by . This book was released on 2017 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gulf Coast kangaroo rat (Dipodomys compactus) is an endemic Texas species belonging to the family Heteromyidae. Many heteromyid species, especially kangaroo rats, are highly specialized nocturnal granivorous rodents with external fur lined cheek pouches, bipedal cursorial locomotion, and adaptations for arid and desert conditions. Despite being one of six Texas endemic mammals, few studies have been conducted on habitat requirements, movement, and basic ecology of the Gulf Coast kangaroo rat with no long-term research. From April 2016 to March 2017, I have seasonally monitored burrowing activity of Gulf Coast kangaroo rats and recorded vegetative parameters at 63 randomly selected sites on a working cattle and wildlife ranch located in Guadalupe County, Texas. Sites with active burrows or a history of occupancy were monitored monthly. Within a 10-m radius plot at each site and using the Daubenmire frame cover estimate technique, I recorded percent cover of the following cover classes: bare ground, standing dead vegetation, litter, living grass, and living forbs. Additionally, I identified to the lowest taxonomic level the dominant live green grass and forb species in each Daubenmire frame and recorded the height of the tallest live grass, live forb, and standing dead vegetation. Using a spherical densitometer, I determined the percent woody canopy coverage at each Daubenmire frame. Twenty-two of 63 sites were occupied. Using Nested ANOVA, I found significantly greater cover of litter, taller standing dead, and taller grass (p
Book Synopsis Morphological and Karyotypic Variation of the Gulf Coast Kangaroo Rat, Dipodomys Compactus (Rodentia: Heteromyidae) by : Elizabeth Hovey Smith
Download or read book Morphological and Karyotypic Variation of the Gulf Coast Kangaroo Rat, Dipodomys Compactus (Rodentia: Heteromyidae) written by Elizabeth Hovey Smith and published by . This book was released on 1986 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Maximum Entropy Modeling of Giant Kangaroo Rat (Dipodomys Ingens) Populations by : Sarah A. MacQueen
Download or read book Maximum Entropy Modeling of Giant Kangaroo Rat (Dipodomys Ingens) Populations written by Sarah A. MacQueen and published by . This book was released on 2015 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maximum entropy estimation is a non-parametric method of determining probability distributions from limited information. In the field of ecology, maximum entropy estimation has seen use in the last 10 to 15 years as a method for developing macroecoogical models. Some macroecoogical metrics, such as the intraspecific spatial abundance distribution and the range-area relationship, and methods, such as setting out a grid and counting individuals, are much more easily applied to plants than animals. However, some animal species do lend themselves to this technique, making it possible to determine these metrics. The giant kangaroo rat (Dipodomys ingens) is one such species, with large burrows that are easily identifiable from aerial photography. This provides an opportunity to test out the applicability of the maximum entropy model for the spatial abundance distribution and the range-area relationship, and compare it to the earlier Coleman random placement model. Scale is found to have a significant effect in the applicability of the maximum entropy model, while the Coleman random placement model fits well across a greater range of scales. In addition, it is shown that the Coleman random placement model can be used to estimate the total number of burrows in an area from limited data, with varying accuracy depending on scale.
Author :Darren J. Bender Publisher :Alberta Sustainable Resource Development ISBN 13 :9780778591689 Total Pages :17 pages Book Rating :4.5/5 (916 download)
Book Synopsis An Occurrence-based Habitat Model for the Ord's Kangaroo Rat (Dipodomys Ordii) in Alberta by : Darren J. Bender
Download or read book An Occurrence-based Habitat Model for the Ord's Kangaroo Rat (Dipodomys Ordii) in Alberta written by Darren J. Bender and published by Alberta Sustainable Resource Development. This book was released on 2010 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ord's kangaroo rat (Dipodomys ordii) is considered an endangered species, and is the only kangaroo rat to occur in Canada. The Recovery Plan for Ord's kangaroo rat in Alberta identifies a number of activities necessary for recovery, including identification of distribution, habitat requirements, and essential habitat. This report presents information on the current distribution and habitat requirements for the species across Alberta, using statistical modeling to identify key habitat features from the Ord's kangaroo rat occurrences observed in two years of standard population monitoring. Two goals were intended for the study: to produce a habitat model that could estimate the distribution of the kangaroo rat habitat across its range and predict the species' occurrence in Alberta; and to validate the model using population monitoring data obtained in the subsequent years with reporting on the predictive capacity of the model.--Document.
Author :Darren J. Bender Publisher :Alberta Sustainable Resource Development ISBN 13 :9780778591696 Total Pages :17 pages Book Rating :4.5/5 (916 download)
Book Synopsis An Occurrence-Based Habitat Model for the Ord's Kangaroo Rat (Dipodomys Ordii) in Alberta by : Darren J. Bender
Download or read book An Occurrence-Based Habitat Model for the Ord's Kangaroo Rat (Dipodomys Ordii) in Alberta written by Darren J. Bender and published by Alberta Sustainable Resource Development. This book was released on 2010 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ord's kangaroo rat (Dipodomys ordii) is considered an endangered species, and is the only kangaroo rat to occur in Canada. The Recovery Plan for Ord's kangaroo rat in Alberta identifies a number of activities necessary for recovery, including identification of distribution, habitat requirements, and essential habitat. This report presents information on the current distribution and habitat requirements for the species across Alberta, using statistical modeling to identify key habitat features from the Ord's kangaroo rat occurrences observed in two years of standard population monitoring. Two goals were intended for the study: to produce a habitat model that could estimate the distribution of the kangaroo rat habitat across its range and predict the species' occurrence in Alberta; and to validate the model using population monitoring data obtained in the subsequent years with reporting on the predictive capacity of the model.--Document.
Book Synopsis The Lower Rio Grande Valley of Texas by : Arthur Tillman Potts
Download or read book The Lower Rio Grande Valley of Texas written by Arthur Tillman Potts and published by . This book was released on 1924 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contributions in Mammalogy by : Hugh H. Genoways
Download or read book Contributions in Mammalogy written by Hugh H. Genoways and published by . This book was released on 1996-08-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mammals of New Mexico by : James Smith Findley
Download or read book Mammals of New Mexico written by James Smith Findley and published by . This book was released on 1975 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Speciation and Evolution of the Pygmy Mice, Genus Baiomys by : Packard Robert L
Download or read book Speciation and Evolution of the Pygmy Mice, Genus Baiomys written by Packard Robert L and published by Hardpress Publishing. This book was released on 2016-06-23 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
Book Synopsis The Bats of Texas by : David J. Schmidly
Download or read book The Bats of Texas written by David J. Schmidly and published by . This book was released on 1991 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Texas, home to the world's largest remaining bat cave, Bracken Cave, has the most diverse bat fauna of any state.
Book Synopsis The Ferns (Filicales): The Eusporangiatae and other relatively primitive ferns by : Frederick Orpen Bower
Download or read book The Ferns (Filicales): The Eusporangiatae and other relatively primitive ferns written by Frederick Orpen Bower and published by . This book was released on 1926 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
