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 1023 for “"foraging"”.
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Foraging in space and time
… and types of predation risk while actively foraging. Individuals were either exposed to different predator types (airborne or ground) or combinations of both, or to indirect predators (nest predators). Risk was assumed to be distributed homogeneously, so changing the habitat or temporal …
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Mechanosensory structures in the beaks of probe-foraging birds in relation to their foraging ecology
Some taxa of probe-foraging birds (ibises, kiwi and scolopacid shorebirds) possess the sensory of capability of “remote-touch”, allowing them to detect mechanical vibrations in their foraging substrates using a specialised bill-tip organ in their beaks. This enables them to remotely detect the …
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Foraging habitat niche comparisons and foraging behavior of seven species of flycatchers in southwest Virginia
Foraging habitats and foraging behavior for seven species of Tyrannid flycatchers were measured to examine interspecific habitat resource partitioning, niche breadth and niche overlap. Four of the species inhabited forested areas; Great Crested Flycatcher, Eastern Wood Pewee, Least Flycatcher and …
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Sensory Ecology of Foraging in Bumblebees
… insects exhibit a complex behavior while foraging for nectar and pollen. Many studies have focused on ultimate mechanisms of this behavior, however, the sensory-perceptual processes that constrain such behavior have rarely been considered. In the present study I used bumblebees (Bombus …
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Density-Dependent Foraging in Caenorhabditis Elegans
… of competitors and their behaviors should affect foraging, and moreover suggests that multiple strategies can evolve and co-exist within a single species. I show that both of these predictions are met by foraging Caenorhabditis elegans. In Chapter 2, I show that animals alter their foraging …
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Seabird foraging in dynamic oceanographic features
… eddies, and upwellings, provide important foraging areas for marine predators. These areas serve as important "hotspots" of marine life, by aggregating weakly swimming lower and mid-trophic level species which, in turn, attract foraging predators. Despite the importance of these dynamic …
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Factors affecting foraging by breeding farmland birds
This thesis investigates nesting success, foraging behaviour, chick diet and growth of three ecologically contrasting species (skylark <i>Alauda arvensis</i>, yellowhammer <i>Emberiza citrinella</i> and song thrush <i>Turdus philomelos</i>) on farmland, in relation to microhabitat and the …
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Flamingo foraging plasticity: ecological drivers and impacts
… is the fact that predators display multiple foraging behaviours, thereby allowing them to overcome problems associated with unpredictability of food resources in space and time. The primary goal of this dissertation is to contribute to growing understanding of the ecological causes and …
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Memory Enhances Search Strategies During Odor-Guided Foraging
… These results suggest that rats form distinct foraging strategies based on learned probabilities of resource locations. Further, they can adaptively switch strategies during a single foraging bout, changing from a memory-based strategy to a strategy that relies on olfactory cues when resources …
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Foraging and Menstruation in the Hadza of Tanzania
… very similar resources, the Hadza maintain a foraging lifestyle characterised by a sexual division of labour. Studies of their foraging and food sharing habits serve as the foundation to numerous hypotheses of human behaviour and evolution. Data from the Hadza have featured heavily in debates …
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Seabird digestive physiology in relation to foraging ecology
… digestive processes to different diets and foraging methods, is investigated experimentally. Gut passage rates of different food types of tested in vitro digestibility may reflect dietary specialization, with favoured prey types excreted more rapidly than less frequently encountered prey. …
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Behavioral Strategies and Neural Mechanisms of Dynamic Foraging
… dissection of cortical contributions to dynamic foraging behavior. By a combination of state-space behavioral modeling, large-scale widefield and single-cell imaging technologies, together with encoding models of neural responses, we showed and quantified the rich behavioral repertoire of …
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The foraging strategy of Diadema antillarum (Philippi) (Echinodermata: Echinoidea)
<p>Diadema antillarum (Philippi) is a common echinoid grazer in Caribbean reef areas. Field observations in st . Croix, u.s.v.r. an.d Disc. overy Bay, Jamaica and laboratory experiments demonstrate that these urchins have a strong feeding preference for algal turf. Seasonal variation in the …
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Evolving Efficient Foraging Behavior in Biologically-Inspired Robot Swarms
… present a swarm robotics system that mimics the foraging behaviors of seed-harvester ants, employing evolutionary computation and machine learning to mitigate the adverse effects of unreliable information, variable environments, congestion bottlenecks, and sparse resources. We describe a …
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Simulating the evolution of recruitment behavior in foraging Ants
… is an important determinant of species' optimal foraging strategies, and of the dynamics of populations and communities. In order to explore the interaction of food heterogeneity and colony size in their effects on the behavior of foraging ant colonies, we built agent-based models of the foraging …
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Spatial Ecology of Entomopathogenic Nematodes with Contrasting Foraging Strategies
Laboratory studies have identified a dichotomy in foraging behavior of entomopathogenic nematodes (EPNs) but little is known about their dispersal patterns in the field. Overall goal of this dissertation research was to examine the dispersal behavior of two EPN species with contrasting foraging …
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Foraging Behavior of Spring Bees and Their Agricultural Implications
<p>Colony Collapse Disorder has greatly reduced honey bee populations in the last decade. Native bees have been largely neglected in research, and their floral preferences may have agricultural implications because native bees ameliorate the demand to rely solely on non-native bees. In this work, …
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The foraging behaviour of granivorous birds: a mechanistic perspective.
… have been derived to account for variations in foraging behaviour. However, only a few functional response models have been applied to granivorous farmland birds and these models often have simplifying assumptions that are likely to be inappropriate for these foragers. Consequently, the …
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