Download or read book Muskrat Population Fluctuations written by M. O. Steen and published by . This book was released on 1959 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Movements and Population Dynamics of Muskrats in Missouri Farm Ponds and Streams written by Charles E. Shanks and published by . This book was released on 1951 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Dynamics of Sacramento Valley Muskrats written by Dennis J. Messa and published by . This book was released on 1981 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Dynamics of Muskrats in Managed Marshes at Delta Manitoba written by Darryl Wayne Kroeker and published by . This book was released on 1988 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Muskrats (Ondatra zibethicus) are an important component of wetland ecosystems, as well as being an economically important furbearer.Muskrats are the only significant resident vertebrate consumer of emergent vegetation in many North American wetlands. The large proportion of vegetation which they waste plays an important role in decomposition. Decomposing vegetation provides substrate for bacteria and fungi, which, in turn, feed increased populations of invertebrates (Godshalk and Wetzel 1978). Muskrat foraging and house-building improves interspersion in dense stands of emergent vegetation (Weller and Spatcher 1965, Weller and Fredrickson 1974) which increases invertebrate population levels and results in richer communities of invertebrates (Whitman 1974, Voigts 1976). Spatial interspersion of water and vegetation and increased invertebrate biomass in turn result in greater avian abundance, diversity, and waterfowl use in marshes (Weller and Spatcher 1965, Weller and Fredrickson 197.

Download or read book Muskrat Population Dynamics on a Controlled Wetland in Southern Saskatchewan written by David Wilson Phillips and published by . This book was released on 1979 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Muskrats became re-established at Eyebrow Lake in 1968 when the wetland was reconstructed after eight years of drainage. A comprehensive investigation of the population dynamics of this muskrat population was conducted between January 1977 and April 1978 in order to obtain the biological information essential for effective management of muskrats in controlled wetlands. Emphasis was placed upon the survival patterns, productivity, density and limiting factors within the study population. Sample age ratios indicated that the survival patterns and productivity in the study population were similar to those reported for high density muskrat populations elsewhere. Sex-related differential survival patterns in the study group were reflected in sex ratios obtained during six sample intervals. Sex ratios were found to shift from a near-balanced nestling ratio to a fall juvenile ratio which was strongly imbalanced in favor of males. The juvenile sex ratio remained constant between fall and spri.

Download or read book Muskrat Populations written by Paul Lester Errington and published by . This book was released on 1963 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Dynamics of the Round Tailed Muskrat Neofiber Alleni in Florida Sugarcane written by Lynn Walsh Lefebvre and published by Palala Press. This book was released on 2015-09-05 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Population Fluctuations in Mink Mustela Vison with Comparisons to Muskrat Ondatra Zibethicus and Ermine Mustela Erminea in Southeastern Manitoba and Northwestern Ontario written by and published by . This book was released on 1909 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Manitoba Department of Natural Resources fur harvest records were examined to determine if the provincial populations of mink (Mustela vison), muskrat (Ondatra zibethicus), and ermine (Mustela erminea) exhibit any periodicity. The data were analyzed using an autocorrelation formula. This analysis provided evidence that the provincial mink population exhibits an 8-year cycle. However, the provincial muskrat and ermine populations do not express any discernable trends. The same data were used to determine if there is any association in population cycles among the three fur-bearer species. Correlation coefficients indicated a two year lag in population cycles between mink and muskrat, but none between mink and ermine, and muskrat and ermine. The provincial fur-return data were compared to the price per pelt. The mink population showed a slightly cyclic negative trend in association between the number of animals caught and the price per pelt. The muskrat and ermine populations showed a negative linear trend over eight years. Fur harvest records of eight Manitoba Registered Trapline (RTL) sections plus two Northwestern Ontario RTL regions were examined as above. The two Northwestern Ontario RTL regions were divided into five sections for further comparison. There is evidence of 4-, 8-, 9-, and 10-year population cycles for mink in all but three sections. Muskrat exhibited 4-, 6-, and 9- to 10-year cycles for 7 of 13 sections examined. There was also evidence of population cycles for ermine in 7 of 13 sections. Manitoba sectional fur return data were examined for evidence of association in population cycles among the three species. There is evidence of two and four year lags in population cycles between mink and m skrat for 5 of 8 sections. There was evidence for cycles of association between mink and ermine, and muskrat and ermine in all sections. (Abstract shortened by UMI.).

Download or read book Population Fluctuations of Small Mammals and Sooty Grouse in California written by Robert S. Hoffmann and published by . This book was released on 1956 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrologic Change and Muskrat Population Dynamics in the Peace Athabasca Delta Canada written by Ellen Marguerite Ward and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Empirical and anecdotal reports suggest that muskrat are in decline across North America, including in the 5500 square km Peace-Athabasca Delta ("Delta"), Canada, part of a World Heritage Site with 'in Danger' status pending. This dissertation is concerned with the effects of rapid hydrologic change on the Delta's muskrat population. Analysis of a Landsat-derived record of inundation for the Delta (1972-2017), together with 21 years of muskrat survey records, show that the catastrophic decline in the Delta's muskrat population is synchronous with loss of critical habitat. Results suggest that loss of wetland habitat could be the cause of the observed, but as yet unexplained, decline of muskrat across North America. Conceptual and quantitative agent models of the muskrat population at a model floodplain lake region of the Delta illustrate mechanisms controlling muskrat abundance. Model results show that shoreline habitat and muskrat intensive herbivory are key mechanisms controlling muskrat abundance, while trapping intensity is not a primary factor. This is a key finding as muskrat trapping continues to be an important practice for Indigenous communities with traditional territory in the Delta. Ecological agent modeling, dynamic habitat maps driven by hydrologic change, and landscape genetic analysis are brought together to assess spatio-temporal characteristics of population dynamics for muskrat on the Delta floodplain. Results show that the Delta undergoes dramatic transitions from a network of population sources, to a network of population sinks, on an interannual basis in years following floodwater inputs. Notably, this network of sources and sinks is less prominent following the most recent flood in 2014, suggesting a reduced footprint of the muskrat population on the Delta floodplain, a change with broad implications for the ecological integrity of the Delta ecosystem. Together, the findings from this dissertation lay the groundwork for use of muskrat as an indicator species for the impacts of hydrologic change on wetland ecosystems, particularly in subarctic and arctic delta regions where the hydrologic effects of climate change are pronounced.

Download or read book Wild Mammals of North America written by George A. Feldhamer and published by JHU Press. This book was released on 2003-11-19 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Table of contents

Download or read book Population Fluctuations in Mink Mustela Vison with Comparisons to Muskrat Ondatra Zibethicus and Ermine Mustela Erminea in Southeastern Manitoba and Northwestern Ontario written by Richard Ryan Puttenham and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Dynamics of the Round tailed Muskrat Neofiber Alleni in Florida Sugarcane written by Lynn Walsh Lefebvre and published by . This book was released on 1982 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The round-tailed muskrat (Neofiber alleni) is one of several species of rodents reported to damage sugarcane in south Florida. Information on this microtine rodent's population dynamics was needed to develop appropriate control measures and to determine if and when they should be applied. Neofiber live in burrow systems in sugarcane fields, and these systems can be readily located in recently harvested fields. Snaptrapping, livetrapping, and radio telemetry were used to study methods of population estimation, patterns of burrow system occupancy, reproduction, survival, and interburrow system movements. The sum of burrow system distances across rows, number of burrow systems trapped, burrow system density (high or low), number of burrows plugged, and number of burrows opened after 48 h were the best predictors of the number of Neofiber captured per field, accounting for up to 94 percent of the variation in observed captures. At a given time, average burrow system occupancy was less than 2 individuals. Single adult males or females, male/ female pairs, a female with 1 or 2 young, or 1 or 2 subadults were the most common system occupants. Extended families were encountered occasionally. Adult males frequently moved among neighboring burrow systems, presumably looking for mates. Productivity (number embryos + number juveniles per adult female) tended to be lower or at least not greater in fields with low burrow system densities (10) than in high density fields (/=15) burrow systems. The grower whose fields were studied had recently initiated a 3-year rotation, and Neofiber may be removed from fields before attaining their maximum reproductive rate. Neofiber reproductive rate or survival of young, or both, were low between May and November, the period of crop maturation. The study area's Neofiber population appears to have declined in recent years, possibly as a result of the shorter crop rotation, replanting by blocks of fields, and the introduction of mechanical harvesting. Control measures to reduce the population in this area are not warranted at this time. Surveys for the presence of Neofiber burrow systems 1 to 2 months after fields are harvested are recommended. High local populations could be effectively reduced by snaptrapping.

Download or read book Fluctuations in Numbers of the Muskrat ondatra Zibethica in Canada written by Charles Sutherland Elton and published by . This book was released on 1942 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Fluctuations in Mink Mustela Vison with Comparison to Muskrat Ondatra Zibethicus and Ermine Mustela Erminea in Southeastern Manitoba and Northwestern Ontario written by Richard Ryan Puttenham and published by . This book was released on 1997 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Time series Analysis of Mammalian Population Fluctuations written by John D. Erb and published by . This book was released on 2001 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biology and Conservation of Musteloids written by David Whyte Macdonald and published by Oxford University Press. This book was released on 2017 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: The musteloids are the most diverse super-family among carnivores, ranging from little known, exotic, and highly-endangered species to the popular and familiar, and include a large number of introduced invasives. They feature terrestrial, fossorial, arboreal, and aquatic members, ranging from tenacious predators to frugivorous omnivores, span weights from a 100g weasel to 30kg giant otters, and express a range of social behaviours from the highly gregarious to the fiercely solitary. Musteloids are the subjects of extensive cutting-edge research from phylogenetics to the evolution of sociality and through to the practical implications of disease epidemiology, introduced species management, and climate change. Their diversity and extensive biogeography inform a wide spectrum of ecological theory and conservation practice. The editors of this book have used their combined 90 years of experience working on the behaviour and ecology of wild musteloids to draw together a unique network of the world's most successful and knowledgeable experts. The book begins with nine review chapters covering hot topics in musteloid biology including evolution, disease, social communication, and management. These are followed by twenty extensive case studies providing a range of comprehensive geographic and taxonomic coverage. The final chapter synthesises what has been discussed in the book, and reflects on the different and diverse conservation needs of musteloids and the wealth of conservation lessons they offer. Biology and Conservation of Musteloids provides a conceptual framework for future research and applied conservation management that is suitable for graduate level students as well as professional researchers in musteloid and carnivore ecology and conservation biology. It will also be of relevance and use to conservationists and wildlife managers.