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 71 for “"predator-prey interactions"”.
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Predator-prey Interactions of Fishes in Two Nebraska Sandhill Lakes
… density (PSD). However, direct assessment of predator effects on panfish populations is still needed. The objective of my study was to determine seasonal food habits of bluegill, yellow perch, largemouth bass, and northern pike in Pelican and West Long lakes, Nebraska, in 2001. Although …
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Predator-prey interactions involving the soybean aphid (Hemiptera: Aphididae) in Missouri
… fields in Missouri. We hypothesized that a predator complex suppresses soybean aphid populations in Missouri prior to reaching economic threshold and that this complex can easily be disturbed by insecticide applications. To determine which predator is most responsible for suppressing aphid …
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Modeling for microbial communities with cross-feeding and predator-prey interactions
… diverse ways, such as resource competition and predator-prey interactions. In ecology, mathematical models have been proved effective in simulating diverse interactions and studying the stability of ecosystems under different interacting patterns and strengths. However, such a community-level …
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EFFECTS OF ABIOTIC STRESS AND PREDATOR REFUGE ON TERRESTRIAL PREDATOR-PREY INTERACTIONS
… understand how abiotic stress modifies species interactions, including predation. In marine habitats, a well-supported hypothesis holds that stress reduces the importance of predation because predators are more vulnerable to stress than prey, but this hypothesis has not been well-tested in …
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Interpreting Predator – Prey Interactions in Cayuga Lake Fishes Using Fatty Acid Signature Analysis
Fatty acids are transferred from prey to predator and can be used to assess trophic interactions in aquatic food webs. Therefore, to better understand Cayuga Lake food web dynamics, fatty acid signatures (FAS) of lake trout (Salvelinus namaycush) were compared to two major prey species in the lake; …
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Habitat, landscape, and climate effects on riparian predator-prey interactions in a human-dominated ecosystem
Predator-prey interactions form ecologically significant links between terrestrial and aquatic ecosystems, and may be particularly important in riparian ecosystems with highly variable habitat features in human-dominated landscapes. Climate models predict an increased frequency of summer drought …
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Functional diversity enhances detection of ecosystem stability and resolution of predator-prey interactions within a multitrophic community
… of longhorned beetles and their beetle predators. I also considered predator-prey interactions between beetles and their insectivore avian predators at the community level.</p> <p>To meet my objectives, I developed new functional traits to further capture beetle species’ functional roles …
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Fire, flooding, and felids: Deer and puma spatial ecology and predator-prey interactions in dynamic, subtropical wildlands
… alter resources and thereby animal populations. Interactions between disturbance and resource availability can influence predator-prey interactions. Predator-prey responses to ecological disturbance may be more pronounced in herbivores and their predators as herbivores track food resources that …
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High-resolution spatio-temporal quantification of fish predator-prey interactions over ecosystem scales with multispectral underwater sensing and optimality of human visual perception with natural daylight
… This enables high-resolution quantification of predator-prey interactions in space and time over ecosystem scales. We present an example of an event in the Barents Sea where a massive cod predatory swarm of approximately 1.9 million individuals attacks a defending coherently moving linear …
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THE ROBOTFALCON: A NEW METHODOLOGY TO STUDY PREY-PREDATOR INTERACTION AND AN INNOVATIVE BIRD DETERRENCE TOOL
Predation and predator–prey interactions are among the key processes shaping species traits and the functioning of ecosystems. Predators can influence prey through both lethal and non-lethal effects. The latter are less straightforward and therefore less explored than the former, yet they are …
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Ecological aspects of the macroinvertebrates associated with two submersed macrophytes in Lake Kariba
… (i) differences in structural complexity, (ii) predator-prey interactions and (iii) water physicochemical conditions.
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An Approach For Use of Dual Frequency Identification Sonar (DIDSON) to Quantify Behavioral Aspects of Piscivory at Ecologically Relevant Time and Space Scales
<p>Predator-prey interactions of large vagile fishes are difficult to study in the ocean due to limitations in the space and time requirements for observations. Small-scale direct underwater observations by divers (<10m >radius) and large-scale hydroacoustic surveys (10s - 100s km2) are traditional …
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Investigating Predation in the Fossil Record: Modern Analogs
… which explores new tools with which to examine predator-prey interactions in the fossil record. Considering the importance of community interactions in the current global biodiversity crisis, understanding ecological and evolutionary dimensions of predation is critical to conservation biology …
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Predator-prey behavioural interactions on plants, with special emphasis on aphid dropping defence and ladybird search strategies
Predator-prey interactions have significant short- and long-term implications for the individuals involved, their populations’ dynamics, and the broader ecological community. Predation is a strong selective force that has led to prey evolving a great diversity of defensive adaptations, while …
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The importance of interaction strength for food web dynamics and ecosystem functioning
… overlook key information relating to patterns of interactions, important relationships, and fundamental ecosystem properties. The study of multi-species predator-prey interactions has also contributed much to our understanding of how complex systems are structured, particularly through the …
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Identification and incorporation of quantitative indicators of ecosystem function into single-species fishery stock assessment models and the associated biological reference points
… biotic communities and an understanding of the interactions among species. The two objectives of this study were to describe the demersal fish community (DFC) associated with the northwestern Gulf shrimp trawl fishery, and to utilize a multispecies Lotka-Volterra model to examine possible …
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Predator species identification from saliva at kill sites with limited remains
… can provide valuable data about elusive predator species and predator-prey interactions for wildlife scientists and managers alike. However, the predator species must be definitively identified as the one responsible for the predation event. The traditional method of visually analyzing …
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The Role of Alarm Pheromones in Predation Avoidance By Adult Central Newts, Notophthalmus Viridescens
Alarm pheromones play an important role in predator/prey interactions. A chemical alarm system has been recently described for Notophthalmus viridescens. This alarm signalling system was tested in the field to determine if newts avoid areas marked with conspecific skin extract in a natural …
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