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Showing 1 to 20 of 21 for “"muskrat"”.
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Muskrat populations in Virginia's Elizabeth River: influence of environmental contaminants
… influence of environmental contaminants on the muskrat population inhabiting the contaminated lower region of the Elizabeth River was studied through an analysis of contaminant burdens, physiological characteristics, and population dynamics in comparison to those of muskrat populations from a …
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Effects of Introduced Muskrat Populations on Emergent Vegetation in South Dakota Wetland
Muskrats (Ondatra zibethicus) and fluctuations of water level are the main forces controlling wetland vegetation cover and composition on a long term basis. IN the absence of artificial water control structures, properly managed muskrat populations are the most natural, long term means of …
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The Rise and Fall of the Louisiana Muskrat, 1890-1960: An Environmental and Social History
… Louisiana noticed that local rodents called muskrats were rapidly increasing and quickly becoming pests by digging up crops and into levees. Property owners soon demanded their elimination, but to the ire of many, Louisiana officials chose to develop a market for muskrat fur and protect its …
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The economic importance of the muskrat in Virginia, with particular emphasis on Montgomery, a mountainous county
… are fourfold: (l) to determine the annual muskrat harvest in a county of southwestern Virginia; (2) to determine the economic value of the annual muskrat harvest in a county in southwestern Virginia; (3) to determine, in so far as possible, those factors which limit a greater harvest of …
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BRIDGING AQUATIC AND TERRESTRIAL ECOSYSTEMS: ECOLOGY OF SEMI-AQUATIC MAMMALS IN SOUTHERN ILLINOIS
… with the presence of beaver (Castor canadensis), muskrat (Ondatra zibethicus), mink (Neovison vison), and river otter (Lontra canadensis), including their interactions, resulting in a better understanding of the areas where these semi-aquatic mammals occur and their effects on the riparian system. …
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Survival and space use of riparian muskrats (Ondatra zibethicus) within an agroecosystem
… could be related to position within watersheds. Muskrats (Ondatra zibethicus) are an economically important furbearer species in this region and occur in small streams and agricultural ditches throughout the Midwest. However, information regarding space use and survival of muskrats in these …
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Anthropogenic environmental change and habitat occupancy by riparian muskrats in a Midwestern landscape
… Distributions of semi-aquatic mammals such as muskrats (Ondatra zibethicus) may respond to environmental changes including increased urbanization, alteration of hydrology, introduction of invasive species, and changes in predator communities. The response of muskrat populations to landscape and …
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Diplostomulum trituri (Trematoda: diplostomatidae) a larval strigeoid trematode in the brain and cranial case of the newt, Notophthalmus viridescens (Rafinesque)
… using Japanese quail, mallard ducks, raccoon, muskrat, opossum, domestic cat, and fish from families Salmonidae, Catostomidae, Cyprinidae, and Centrarchidae as experimental definitive hosts for <u>Diplostomulum trituri</u>.
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Life history of the endangered shiny pigtoe pearly mussel, Fusconaia edgariana, in the North Fork Holston River, Virginia
… species were collect handpicking or in muskrat middens. The density edgariana was 1 adult/2 m². Distribution of the pigtoe was restricted to shallow areas of mixed gravel, and pebble substrate in low to moderate velocities. Drift nets (130um mesh) indicated glochidia edgariana were …
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Behavioral Responses By Cottonmouths (Agkistrodon Piscivorus) To Chemical And Visual Predator Cues
… elevated responses to taxidermed mink and muskrat compared to an inanimate object of similar size and color. My results are consistent with risk-sensitivity predictions in that cottonmouths can use chemical cues to recognize predators and use visual cues to distinguish predatory bird …
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Productivity of A Resident Giant Canada Goose Flock in Northeastern South Dakota
… geese. Artificial nesting structures, islands, muskrat houses and peninsulas were used by geese as nesting sites. Mean clutch size of completed nests was 5.14 in 1974 and 5.26 in 1975. Mean clutch size was 5.38 on ANS and 4.89 on NNS for the 2-year study. At least one egg hatched in 87 percent …
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Characteristics of trappers in Maine, 1976 to 1980
… Fox was the most preferred upland species and muskrat was the most preferred aquatic species. Detailed information was obtained from individuals who trapped in the fall. Effort per day of season was estimated in both trapper-days and average trap-nights. The problems rated highest by trappers …
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Fish and mammals of the lower Calaveras River, Stockton, CA
… mouse (Mus musculus), black rat (Rattus rattus), muskrat (Ondatra zibethicus), and European rabbit (Oryctolagus cuniculus). House mice were only captured in traps October 2008 through March 2009, and more males were captured than females. Most organisms in this ripmian habitat were found to be …
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Life history of the endangered fine-rayed pigtoe pearly mussel, Fusconaia cuneolus (Lea, 1840), in the Clinch River, Virginia
… obtained by thin-sectioning shells collected in muskrat middens at Slant and Pendleton Island, Virginia. As predicted by the von Bertalanffy equation, the fine-rayed pigtoe achieves a maximum length of roughly 90 mm and age of 35 yr in the Clinch River. Annual growth in length averaged 5 mm/yr …
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Distribution and life history of the endangered James Spinymussel, pieurobema collina (bivalvia: unionidae)
… obtained by thin-sectioning valves collected in muskrat middens in Dicks and Johns creeks, Virginia. Ages ranged between 3 and 19 yr, and a strong year class was identified at age 11. Mean annual mortality rate was calculated to be 9.8%. As predicted by the von Bertalanffy growth equation, P. …
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Determining Sources of Fecal Pollution in the Blackwater River Watershed, Franklin County, Virginia
… chicken, horse, goat, sheep, deer, raccoon, muskrat, goose, duck, coyote, and wild turkey fecal samples. Each isolate was classified as human, wildlife or livestock. Correct classification rates were 82.3% for human, 86.2% for livestock and 87.4% for wildlife isolates when profiles were …
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Determining Sources of Fecal Pollution in Washington D.C. Waterways
… chicken, horse, goat, sheep, deer, raccoon, muskrat, goose, seagull, coyote, duck, wild turkey, dog, and cat. Antibiotic profiles were characterized for 24 unknown enterococci isolates on each of 198 samples (38 samples from the Potomac River, 79 samples from the Anacostia River, and 81 …
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