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 20 of 27 for “"foraging efficiency"”.
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Autumn Foraging and Staging Ecology of Eastern Population Sandhill Cranes (Antigone canadensis tabida)
… effects on the following topics: 1) age-specific foraging scale and numerical response, 2) age-specific foraging efficiency, and 3) roost use. I used field observation and experimentation, GPS tracking, and GIS analysis to investigate these topics at a key staging area on Manitoulin Island, …
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Nonbreeding Foraging Ecology of the Brown-headed Nuthatch (<i>Sitta pusilla</i>)
… a common behavioral strategy that may increase foraging efficiency and/or reduce predation threat. I surveyed mixed-species pine-savanna canopy flocks and recorded flocking and foraging behavior of Brown-headed Nuthatches (Sitta pusilla) in both natural conditions and following predator call …
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Foraging efficiencies and species' distributions : an explanation of the Hadeda ibis (Bostrychia hagedash) in relation to soil moisture
The influence of soil moisture on the foraging time needed to meet BMR (foraging efficiency) in hadedas was explored in Cape Town, South Africa. This was done by monitoring hadedas foraging and recording the prey items eaten successfully per minute on soils of different moisture. BMR was calculated …
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Variation in wing area and prey detection volume of Rhinolophus Capensis in response to different climates
… bats with a highly specialized system of foraging. Climate change poses an enormous risk to a bat's foraging success, because rising ambient temperatures are likely to change the selective pressures on wing size (due to the potential thermoregulatory benefits) as well as prey detection …
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Large mammal resource depression and agricultural intensification: an empirical test in the Mimbres Valley, New Mexico
… has tested the proposition that wild resource foraging efficiency declined in any archaeological case in which there is evidence that agriculture became more important. This dissertation is a study of hunting and farming in the Mimbres Valley of southwestern New Mexico that is directed at …
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Habitat Characteristics Affecting Site Occupation in Wintering Henslow’s Sparrows at Mississippi Sandhill Crane National Wildlife Refuge
… sparrow selects habitats that may maximize foraging efficiency and probability of survival based on information about litter density and seed availability.</p>
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Response of the Ozark Zigzag Salamander (Plethodon Angusticlavius) to High and Low Level Threats
… natural conditions, there is a trade-off between foraging efficiency and anitpredatory vigilance. This study examined the foraging tactics of the Ozark zigzag salamander (Plethodon angusticlavius) under low and high levels of threat. I predicted that the salamander would specialize on the most …
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Group size affects predation risk and foraging success in Pacific salmon at sea
… especially by improved predator avoidance and foraging efficiency. However, such theories are difficult to test in the wild, especially in marine environments where observing individuals is challenging, and quantifying predation risk or foraging success is often impossible. To overcome these …
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Sublethal Effects of Pesticides on Visually-Guided Bee Behaviours
… of agricultural crops through extensive foraging. They possess visual systems that are highly sensitive to motion and rely on motion of visual elements (optic flow) to efficiently navigate their complex environment with high precision. Optic flow stimulates an innate response known as the …
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Causes and consequences of the postfire increase in deer mouse (Peromyscus maniculatus) abundance
… of food resources in burned areas, (2) increased foraging efficiency of deer mice, (3), predatory release, and (4) source - sink dynamics, with burned areas acting as high abundance dispersal sink. However, none were supported by data. Thus, I concluded that the existing explanations of postfire …
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A Comparative Study of Nature Inspired Algorithms for Prioritized Foraging
Prioritized foraging in swarm intelligence refers to the ability of a swarm to collect items while accounting for differences in their importance. Prioritized foraging is examined in settings which contain multiple item types, where each item type is associated with a distinct priority level. The …
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Causes and consequences of the postfire increase in deer mouse (Peromyscus maniculatus) abundance
… of food resources in burned areas, (2) increased foraging efficiency of deer mice, (3), predatory release, and (4) source - sink dynamics, with burned areas acting as high abundance dispersal sink. However, none were supported by data. Thus, I concluded that the existing explanations of postfire …
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Modelling animal movement in heterogeneous environments: from statistical inferential models to individual-based models
… correlated random walks, as well as real foraging trajectories of little penguins (Eudyptula minor) obtained by GPS telemetry. The modelling procedure correctly classified 92.5% of all individual location observations in the synthetic trajectories, demonstrating reasonable ability to …
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The role of stochastic resonance and physical constraints in the evolution of foraging strategy
… study of the optimization of this process: foraging within a single, finite food patch for a limited amount of time. The work is an example of the computational algorithms of statistical physics being applied to the ecological field of foraging behavior. The analysis begins with an …
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Polyspecific Associations of Callimico Goeldii, Saguinus Labiatus, and Saguinus Fuscicollis in Acre, Brazil
… function to reduce predation risk or improve foraging efficiency. Behavioral and ecological data were collected on the study species over a total of 15 months at the Fazenda Experimental Catuaba, an 820 ha rainforest site in Acre, Brazil. All three species were in association 67% of …
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Dynamics and Communication Structures of Nectar Foraging in Honey Bees (Apis mellifera)
In this thesis, I examined honey bee nectar foraging with emphasis on the communication system. To document how a honey bee colony adjusts its daily nectar foraging effort, I observed a random sample of individually marked workers during the entire day, and then estimated the number and activity of …
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Ecological consequences of genetic variation in foraging behaviors of a predatory mite
Foraging traits such as prey consumption rate and the efficiency with which predators convert their prey into offspring are important determinants of local predator-prey dynamics. However, in environments with patchy prey distribution, predator dispersal and aggregation in response to prey-induced …
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THE BEHAVIOR OF THE SCYPHOMEDUSAE CHRYSAORA QUINQUECIRRHA AND AURELIA AURITA AND ITS ECOLOGICAL IMPORTANCE
… for assessing its effect on spatial patterns and foraging efficiency. An approach was developed that uses a suite of statistical techniques to quantitatively describe time-dependent changes in behavior of pelagic organisms and tested on the swimming behavior of Aurelia aurita and the foraging …
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Winter Behavior and Ecology of Eastern Bluebirds (<i>Sialia sialis</i>): Home Ranges, Habitat Use, and Effect of Weather on Foraging Behavior
… presence) on habitat occupancy, group size, and foraging behavior. My study was conducted at the Blue Grass Army Depot in Madison County, Kentucky. I radio-tracked 19 bluebirds during January and February 2010 and 2011 and recorded their locations, the size and composition (males vs. females) of …
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Aspects of Foraging in Bees: Apple Pollination, Native Bee Populations, and Honey Bee Communication
… I investigate two important aspects of foraging: pollination of an important crop by native bees and communication of floral resources by social bees. Native bees that pollinate apples are an economically important and potentially limited resource. Native bees are often overlooked since …
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