Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"predator populations"”.
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Factors Influencing Use of Fecal Line Surveys For Estimating Trends in Predator Populations in Western South Dakota
… vulpes), and striped skunk (Mephitis mephitis) populations is necessary to monitor population changes in western South Dakota. Fecal line surveys were used to estimate relative densities because they are easy to use, inexpensive, do not elicit responses of predators, and provide the most …
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Estimation of Predator Densities in Western South Dakota
Evaluation of methods for predator density estimation is necessary to assess biases in techniques and determine those best suited to local conditions. Knowledge of predator populations allow wildlife managers to prescribe and assess management and control activities. Objectives of this study were …
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Generalist predators in reduced-tillage corn: predation on armyworm, habitat preferences, and a method to estimate absolute densities
The potential impact of generalist predators on armyworm mortality was evaluated in the field, through a predator removal study, and in the laboratory, through controlled feeding trials. The most common potential armyworm predators removed from the field included ground beetles (Carabidae), rove …
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Effect of enhanced nutrition during winter on the Uncompahgre Plateau mule deer population
Mule deer (Odocoileus hemionus) populations declined across much of the West during the 1990s, prompting state wildlife agencies to explore mule deer limiting factors. The greatest concern of agencies and sportsmen was whether declining habitat quality, predation, or both were responsible for the …
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Determinants of predator abundance in northern KwaZulu-Natal: top-down or bottom-up?
… ultimately aim to successfully conserve natural predator populations, an understanding of the non-anthropogenic drivers of their population change is critical. Both bottom-up (e.g. food limitation, competition) and top-down (e.g. predation, interference) processes play an important role in …
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Reproductive Ecology of Greater Sandhill Cranes in Nevada
… survival. Our results suggest that management of predator populations may influence fledging for cranes in northeast Nevada.
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
… minimum tillage activities in hopes of retaining populations of beneficial, predatory insects that may decrease the need for pesticide use. The purpose of this research was twofold. First, this on-farm research assessed the population and activity of six beneficial arthropod predators - the …
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Is Everything Connected? Following the Predators, Pests, and Plants Within a No-Till, Western Montana Agroecosystem
… minimum tillage activities in hopes of retaining populations of beneficial, predatory insects that may decrease the need for pesticide use. The purpose of this research was twofold. First, this on-farm research assessed the population and activity of six beneficial arthropod predators - the …
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Tests of Functional Equivalence Among Aquatic Predatory Vertebrates
… the issue of functional equivalence of aquatic predatory vertebrates. I specifically focused on the response of larval anurans to (i) variation in the identity of predator species, (ii) variation in trait characteristics possessed by predators and (iii) variation in the total biomass and density …
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Population Ecology of Rocky Mountain Elk in the Black Hills, South Dakota and Wyoming
… at higher elevations. Our study showed that elk populations have the ability to thrive within an ecosystem with healthy predator populations.</p>
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Influence of reef-associated predators on adjacent soft-sediment communities
… been suggested to be caused by reef-associated predators. A large-scale mensurative experiment was used to investigate the distribution of two size classes of macrofauna with distance from the reef edge across three locations in northeastern New Zealand. The role of reef-associated predators, …
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Fate Of Captive-Reared Bobwhite Quail Released In Central Kentucky
… birds was 100%. Raptors, coyotes, and mesomammal predators were responsible for most (84%) of the identified quail mortality; accounting for the deaths of 12, 9, and 5 quail, respectively. There was no significant difference in mean length of survival for male vs female bobwhites at Site 1 …
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A potential mechanism sustaining the biological hotspot around Palmer Deep Canyon
… hotspot due to the high number of marine predators during the austral summer. The mechanisms that drive this hotspot, however, are poorly understood. Glider and satellite-based temperature and chlorophyll measurements in the region previously suggested that upwelling of warm, nutrient-rich …
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Food Habits of Walleye and Saugeye When Stocked as Secondary Predators into Small South Dakota Impoundments
… salmoides and walleye Stizostedion vitreum populations and sympatric walleye and saugeye Stizostedion vilreum X Stizostedion canadense populations in one South Dakota natural glacial lake and three South Dakota small impoundments. The food habits study of sympatric largemouth bass and …
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Utility of Walleyes and Saugeyes as Secondary Predators in Small South Dakota Impoundments
… were observed in Hanson, Iroquois or Hayes Lake populations. The 1998 cohort of walleyes had significantly higher survival than saugeyes in Hanson Lake during fall 1999 and spring 2000. Saugeyes survived better than walleyes in Bode Pond during fall 2000. In all other lakes survival of both …
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The ecology of a recovering native predator: the European pine marten (Martes martes)
Predators have undergone severe historical decline due to human persecution and habitat loss. Predator populations are starting to recover in parts of Europe for the first time in response to protective legislation and conservation efforts. The landscapes native predators are recovering in are …
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Movement ecology of the bronze whaler shark (carcharhinus brachyurus) in southern Africa
… water temperature), and trophic (prey and top predator occurrence) variables may influence the movements C. brachyurus at both regional and local scales (i.e., within False Bay) in South Africa. Transboundary movement of conventionally tagged C. brachyurus between South Africa, Namibia and …