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 18 of 18 for “"predator-prey relationships"”.
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Epistasis in Predator-Prey Relationships
… a single phenotype. We model epistasis of the prey in a two-locus two-allele problem in a basic predator- prey relationship. The resulting model allows us to examine both population sizes as well as genotypic and phenotypic frequencies. In the context of several numerical examples, we show that …
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The Role of Predator-Prey Relationships in The Nidality of Leptospirosis
Made available in DSpace on 2014-12-09T22:30:09Z (GMT). No. of bitstreams: 1 6607795.pdf: 13358756 bytes, checksum: 7a03b97cbd1a90d86f139547e5b6c322 (MD5) Previous issue date: 1966
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The population status, breeding success and diet of Subantarctic Skuas two decades after the feral cat eradication on Marion Island
Prey availability is often the driver behind predator population trends, diet and breeding success. Changes in predator abundance and breeding success represent numerical responses to changes in prey abundance, whereas dietary shifts can be classified as functional responses. Invasive mammals …
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Revisiting Aldo Leopold's "Perfect" Land Health: Conservation and Development in Mexico's Rio Gavilan
… runoff rates regulating erosion and historical predator-prey relationships. The visits confirmed Leopold's concept of land health, inspired many of his essays, and helped shape his land ethic. Leopold proposed the area as a control site to research healthy land throughout North America . The …
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Efficacy Of Constructed Wetlands Of Various Depths For Natural Amphibian Community Conservation
… ephemeral wetlands, 2) to examine amphibian predator-prey relationships within the constructed wetlands, and 3) to determine what wetland characteristics affect species composition. Three types of wetlands were sampled forested natural ephemeral, shallow constructed (< 20 cm minimum depth), …
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Climate impacts and adaptation in the Dungeness crab fishery: a social-ecological systems perspective
… crab fishery by exploring the changing inter-relationships within and between coupled human and ecological communities. I first considered trophic-mediated climate risk to juvenile Dungeness crab, demonstrating the value of molecular diet analysis (“dDNA”) in understanding risk to, and …
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Habitat Selection and Range Overlap of Moose and White-tailed Deer in the Boreal Plains of Saskatchewan
… compounded by climate change, are reshaping predator–prey relationships among moose (Alces alces), white-tailed deer (Odocoileus virginianus), boreal caribou (Rangifer tarandus caribou), and wolves (Canis lupus). White-tailed deer, historically uncommon in boreal forests, have expanded their …
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Ecological Factors Associated With Songbird and Small Mammal Predation by Texas Ratsnakes
Predator-prey relationships have received extensive theoretical and empirical attention although the majority of studies have focused exclusively on prey. In studies of avian ecology, predation is the primary cause of nest failure and yet few studies examine predators directly. For my dissertation, …
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Trouble on the Range: When Does a National Park Become a Bison Zoo?
… hunting pressure, federal policy, and unnatural predator-prey relationships made Yellowstone’s northern range a haven for elk herds. As they proliferated in peace, elk chewed through the northern range’s preexisting ecosystems. Their appetites took a severe toll on native flora, which in turn, …
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Relation of Habitat to Fish Community Characteristics in Small South Dakota Impoundments
… has focused on fish community structure and predator/prey relationships. Previous research revealed that largemouth bass Micropterus salmoides relative abundance in small South Dakota impoundments was positively correlated with aquatic vegetation coverage and Secchi disk transparency. The …
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Fish landings, discards and benthic material from demersal trawling in the western English Channel (ICES VIIe)
… species. Several within and between-species relationships were explored to assess the wider interpretation of the fish community data. This examined size of Raja spp., several predator-prey relationships and the utility of Marthasterias glacialis as an indicator of fishing disturbance. …
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The effect of recreational fishing on targeted fishes and trophic structure, in a coral reef marine park
Recreational line fishing is highly targeted at predatory fishes, making them vulnerable to overfishing. These same fishes play a role in trophic structure by regulating prey species. Despite increasing numbers of fishers, few studies have investigated the potential effects of recreational fishing …
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The use of exponential random graph models to explore social foraging dynamics of interspecific songbird assemblages
… do not account for interspecific variation in predator behavior or prey responses, though interactions among prey and between predators and prey are known to affect foraging behavior. We did not observe any influence of interspecific social foraging on temporal feeding patterns, but species …
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An Assessment of Northern Pike Populations in Small South Dakota Impoundments
… small South Dakota impoundments to determine predator-prey relationships. Densities (number of fish ≥ stock length ha-1) of northern pike within the three ponds ranged from 6 to 20 in 1994 and 10 to 13 in 1995. Density of northern pike was significantly higher (α=0.05) in Section Six Pond than …
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The ecology of three sandy beaches on the West Coast of South Africa
… In addition, interspecific competition and predator-prey relationships were investigated, to determine whether these had any influence on the distributions of the species concerned. Animal-sediment relationships are investigated in chapter 8 and two major types of relationship are described. …
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Predator-prey dynamics under the influence of exogenous and endogenous regulation : a data-based modeling study on spring plankton with respect to climate change
Understanding the interactions of predators and their prey and their responses to environmental changes is one of the striking features of ecological research. In this thesis, spring dynamics of phytoplankton and its consumers, zooplankton, were considered in dependence on the environmental …
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Movement, Distribution, and Habitat Use of Yellow Perch in a Complex Lake Basin
… this model in the field; and 5) identify any predator-prey relationships that may influence yellow perch distribution. Ultrasonic telemetry was used to determine seasonal and diel movement patterns of adult yellow perch. Transmitters were externally attached to yellow perch in two size groups. …
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BRIDGING AQUATIC AND TERRESTRIAL ECOSYSTEMS: ECOLOGY OF SEMI-AQUATIC MAMMALS IN SOUTHERN ILLINOIS
… engineers, trophic transfer agents, and apex predators, thus acting as indicators of freshwater ecosystem function. Watersheds inhabited by semi-aquatic mammals have increased links between adjacent terrestrial and aquatic ecosystems compared to watersheds where they are not present. …