Download or read book Determining the Effects of Livestock Grazing on Yosemite Toads Anaxyrus Bufo Canorus and Their Habitat written by Amy J. Lind and published by . This book was released on 2011 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Modeling and Movements of the Yosemite Toad Anaxyrus written by Christina Teh-ping Liang and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yosemite toad (Anaxyrus (=Bufo) canorus) is a high-elevation species endemic to the Sierra Nevada mountain range in California and is part of the world-wide amphibian declines phenomenon. The toad is thought to have disappeared from over 50% of its historic range even in seemingly undisturbed areas, and remaining populations appear to be in decline. The causes of the disappearance and decline are unknown, and this poses a particular challenge for management and conservation since there is little understanding on how to ensure the survival of remaining populations. In order to provide information that can be used to inform management and to aid in the conservation of the species, my research on the Yosemite toad consisted of three parts: (1) constructing species distribution models to identify environmental correlates; (2) identifying environmental correlates associated with different habitat patch types; and (3) determining movement patterns and habitat use in the terrestrial environment. In the first study, I used Yosemite toad survey data from over 2,200 sites in the Sierra National Forest in the southern part of the toad's range and related them to 54 environmental variables. I found that the Yosemite toad has a complex relationship with the environment and is correlated with both biophysical and management related variables. In the second study, I looked at 49 consistently occupied sites versus 27 intermittently occupied sites throughout the range of the Yosemite toad and related the two site types separately to 26 environmental variables. I found that the different site types were correlated with different environmental variables. In the third study, I radio-tracked 42 adult Yosemite toads and collected data on their movements and habitat use. I found that toads traveled up to 1.26 kilometers away from breeding sites, and the average distance moved was 275 meters. The toads were often found in burrows and extensively used the terrestrial environment. The results from my research help elucidate the environmental requirements of the Yosemite toad both in and away from breeding sites, and can be used to inform management decisions for protection of the species and its habitat.
Download or read book Yosemite Toads Bufo Canorus and Mountain Garter Snakes Thamnophis Elegans Elegans written by Julia Jane Nelson and published by . This book was released on 2008 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Decline Movement and Habitat Utilization of the Yosemite Toad Bufo Canorus written by David Lamar Martin and published by ProQuest. This book was released on 2008 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Canorus terrestrial foraging habitats, thereby having a greater impact on long term population viability, which is a classic example of well intended management practices failing to protect species due to the absence of adequate knowledge of the specialized habitat needs of amphibians. This study suggests the need for a B. canorus core habitat protection zone that extends 500m from the center of all actively used breeding pools.
Download or read book Effects of Grazing on the Movements and Habitat Use of Western Toads Bufo Boreas on the Targhee National Forest written by Paul E. Bartelt and published by . This book was released on 1995 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Demographic Modeling of Conservation Strategies for the Yosemite Toad Anaxyrus Canorus written by Corrina R. Kamoroff and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yosemite toad (Anaxyrus canorus) is an anuran species endemic to the Sierra Nevada in California that, like many amphibians globally, has suffered population declines. The documented decline in A. canorus populations across their historic range highlights the need for an effective management strategy to protect the species from future extirpation. For this study, I estimated survival rates of A. canorus using a Cormack-Jolly-Seber model populated with data from a demographic study. I then used a female-only post-birth pulse stochastic Lefkovitch matrix model using vital rates I estimated and from the literature to simulate the effect of different management scenarios and to optimize a supplementation or reintroduction management plan. Without any management action, small populations of A. canorus populations have ≥50% risk of quasi-extinction over the next 13 years. The implementation of effective management strategies is critical to prevent further extinction of existing small populations. My results suggest that the effectiveness of a supplementation or a reintroduction management plan is dependent on the initial population size of the receiving population, life stage at release and number of individuals released into a wild population. I found that supplementing small toad populations with female adults is the most effective supplementation strategy to increase the stochastic growth rate and minimize the risk of quasi-extinction. This thesis suggests that modeling A. canorus population dynamics and trends of extant populations can help inform conservation strategies.
Download or read book Population Status of the Yosemite Toad Bufo Canorus written by Martin, David Lamar and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evolutionary Past Present and Future of the Yosemite Toad Anaxyrus Canorus written by and published by . This book was released on 2018 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: X
Download or read book Emulated Natural Disturbance as Habitat Restoration for the Wyoming Toad Anaxyrus Baxteri written by James M. Vance and published by . This book was released on 2016 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amphibian populations are declining rapidly around the world, with 207 species declining for unknown reasons. Science can play a critical role in recovering these species by elucidating decline causes and mitigation methods. The Wyoming toad (Anaxyrus baxteri) is an example of a critically endangered amphibian where gaps in information limit species recovery. Despite nearly 20 years of reintroductions, no self-sustaining populations have been reestablished. It is likely that altered disturbance regimes have changed habitat conditions and, at least partially, inhibited species recovery. Moreover, low retention of release animals (i.e. high mortality or dispersal) has hindered reestablishment. The Wyoming toad evolved in grassland habitat maintained by regular disturbances including fire and grazing, which created open habitat conditions that promote egg development and animal growth. However, grazing regimes have been highly altered and fire has been largely excluded throughout the Wyoming toad’s range. Releases have largely consisted of larval animals without supportive measures, leading to low survival and recruitment of released tadpoles into subsequent age classes. I assessed two objectives related to Wyoming toad reestablishment: 1) understand the effects of fire and cattle grazing on growth, survival, and habitat selection in Wyoming toads (Chapter 1); and 2) determine if different release methods may increase the effectiveness of Wyoming toad reintroductions (Chapter 2). For objective 1, toads raised in recently-burned habitats were larger than those raised in unburned areas and short-term exclusion of grazing had no effect on animal size. Wyoming toads of all ages selected for open canopy areas with recently-metamorphosed individuals selecting areas that were more open than adults. For objective 2, raising tadpoles in enclosures until metamorphosis prior to release increased size and on-site retention. My results demonstrate the importance of habitat management and release methodology in increasing the success of Wyoming toad reintroductions. This information can be used to improve recovery of endangered amphibians and help reverse the trend of amphibian declines.
Download or read book Handbook of Road Ecology written by Rodney van der Ree and published by John Wiley & Sons. This book was released on 2015-06-15 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winner of the IENE Project Award 2016. This authoritative volume brings together some of the world’s leading researchers, academics, practitioners and transportation agency personnel to present the current status of the ecological sustainability of the linear infrastructure – primarily road, rail and utility easements – that dissect and fragment landscapes globally. It outlines the potential impacts, demonstrates how this infrastructure is being improved, and how broad ecological principles are applied to mitigate the impact of road networks on wildlife. Research and monitoring is an important aspect of road ecology, encompassing all phases of a transportation project. This book covers research and monitoring to span the entire project continuum – starting with planning and design, through construction and into maintenance and management. It focuses on impacts and solutions for species groups and specific regions, with particular emphasis on the unique challenges facing Asia, South America and Africa. Other key features: Contributions from authors originating from over 25 countries, including from all continents Each chapter summarizes important lessons, and includes lists of further reading and thoroughly up to date references Highlights principles that address key points relevant to all phases in all road projects Explains best-practices based on a number of successful international case studies Chapters are "stand-alone", but they also build upon and complement each other; extensive cross-referencing directs the reader to relevant material elsewhere in the book Handbook of Road Ecology offers a comprehensive summary of approximately 30 years of global efforts to quantify the impacts of roads and traffic and implement effective mitigation. As such, it is essential reading for those involved in the planning, design, assessment and construction of new roads; the management and maintenance of existing roads; and the modifying or retrofitting of existing roads and problem locations. This handbook is an accessible resource for both developed and developing countries, including government transportation agencies, Government environmental/conservation agencies, NGOs, and road funding and donor organisations.
Download or read book Beef Cattle Production Systems written by Andy D. Herring and published by CABI. This book was released on 2014-10-24 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides an integrated view of beef cattle production with a systems based approach, discussing the interrelationships of a broad range of aspects with the overall goal of optimising cattle production. This book provides the background to allow cattle producers to match their production environments with genetic, management, and marketing opportunities for sustainable beef production globally. This logic and resulting considerations can then be tailored to address specific regional challenges and opportunities worldwide. Considerations and examples for extreme situations will be provided, such as very small herds, very large herds, communal-group situations, and minimal artificial input systems.
Download or read book Sierra Nevada Forest Plan Amendment Appendices written by and published by . This book was released on 2001 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Colorimetric Determination of Nitrate Plus Nitrite in Water by Enzymatic Reduction Automated Discrete Analyzer Methods written by Charles J Patton and published by CreateSpace. This book was released on 2014-06-16 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents work at the U.S. Geological Sur- vey (USGS) National Water Quality Laboratory (NWQL) to validate enzymatic reduction, colorimetric determinative meth- ods for nitrate + nitrite in filtered water by automated discrete analysis. In these standard- and low-level methods (USGS I-2547-11 and I-2548-11), nitrate is reduced to nitrite with nontoxic, soluble nitrate reductase rather than toxic, granular, copperized cadmium used in the longstanding USGS auto- mated continuous-flow analyzer methods I-2545-90 (NWQL laboratory code 1975) and I-2546-91 (NWQL laboratory code 1979). Colorimetric reagents used to determine resulting nitrite in aforementioned enzymatic- and cadmium-reduction meth- ods are identical. The enzyme used in these discrete analyzer methods, designated AtNaR2 by its manufacturer, is produced by recombinant expression of the nitrate reductase gene from wall cress (Arabidopsis thaliana) in the yeast Pichia pastoris. Unlike other commercially available nitrate reductases we evaluated, AtNaR2 maintains high activity at 37°C and is not inhibited by high-phenolic-content humic acids at reaction temperatures in the range of 20°C to 37°C. These previously unrecognized AtNaR2 characteristics are essential for success- ful performance of discrete analyzer nitrate + nitrite assays (henceforth, DA-AtNaR2) described here.
Download or read book National Report on Sustainable Forests written by and published by . This book was released on 2004 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This site also contains other information about sustainable resource management.
Download or read book REPTILES OF VIRGINIA PB written by MITCHELL JOSEPH C and published by Smithsonian. This book was released on 1997-08-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Amphibians and Reptiles of Georgia written by John B. Jensen and published by University of Georgia Press. This book was released on 2008 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring more than 475 full-color photographs and 182 maps, this comprehensive guide to the state's diverse herpetofauna makes accessible a wealth of information about 170 species of frogs, salamanders, crocodilians, lizards, snakes, and turtles, including species attributes, behavior, life cycles, habitat, and more.
Download or read book Scientific and Standard English Names of Amphibians and Reptiles of North America North of Mexico written by Society for the Study of Amphibians and Reptiles. Committee on Standard English and Scientific Names and published by . This book was released on 2001 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
