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 16 of 16 for “"intraguild predation"”.
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Modeling and analysis of a three-species food web with facilitated and intraguild predation
… there has been a series of studies investigating intraguild predation between two major loggerhead sea turtle nest predators, North American raccoons and Atlantic ghost crabs. Studies have also highlighted that ghost crab predation assists raccoons in finding nests (i.e., facilitated predation). …
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Abundance and mortality of anchovy eggs caused by cannibalism and intraguild predation, and the potential effect on anchovy recruitment and clupeoid fluctuations
… ecology and evolution of intraspecific and intraguild predation - specifically the determination of an interacting mechanism between the guild fish species Engraulis capensis and Sardinops ocellatus and its significance for future fisheries management.
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Cascading Effects Of Predator Removal On The Ecology Of Sea Turtle Nesting Beaches
… summers of 2003 and 2004. Raccoon and ghost crab predation are among the highest causes of egg mortality for sea turtles in Florida and raccoons are intraguild predators of ghost crabs. Because of the damage done to sea turtle nests, raccoons have been removed from some beaches during the sea …
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Dynamics and optimal harvesting of prey-predator fishery models in the presence of a toxicant using pontryagin maximum principle
… self-produced form. In order to account for the intraguild predation interaction that occurs in marine ecosystems, three species fishery models are also studied by modeling the carrying capacities of both intraguild prey and predator fish as time-dependent variables. The idea of variable carrying …
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Size Structure and Intraguild Interactions between Two Ambystoma Species
<p>Intraguild interactions affect population and community structure through a combination of competition and predation. Changes in size structure influence intraguild interactions by affecting the strength and direction of these species’ interactions. I tested for size-structured intraguild …
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Undercover predators: Vegetation mediates foraging, trophic cascades, and biological control by omnivorous weed seed predators
… mechanisms by which cover impacts weed seed predation in crop environments. ^ First, I performed a meta-analysis of 27 studies to quantitatively evaluate what is currently known about seed predation by vertebrates and invertebrates across weed species, crop environments, and seasons (Chapter …
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Arthropod Predation in Brassica Agroecosystems: Effects of Latitude, Community Composition, and Diet Breadth
… in agroecosystems. Yet, variation in arthropod predation strength among cropping systems and regions can prevent farmers from taking advantage of this alternative pest management strategy. This research examines underexplored potential causes of variation in arthropod predation in …
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Management of Potato Leafhopper and Maple Spider Mite on Nursery Grown Maples
… by the capacity of leaf domatia to influence intraguild predation among phtyoseiid and stigmaeid predators. </em></p>
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Interações entre o predador Podisus nigrispinus (Heteroptera: Pentatomidae) e o parasitóide Palmistichus elaeisis (Hymenoptera: Eulophidae)
… foi determinar se existe competição e predação intraguilda entre Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) e imaturos de Palmistichus elaeisis Delvare & LaSalle (Hymenoptera: Eulophidae) e o efeito desses fenômenos na biologia desses inimigos naturais. No capítulo I pupas de …
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Landscape-scale mechanisms of biological pest control in a South Korean agricultural landscape
… model, the consequences for pests of intraguild predation (IGP) between enemies were found to depend on landscape complexity. In landscapes with high amounts of seminatural habitat and low spatial autocorrelation (high configurational complexity), IGP by vertebrate predators led to a …
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Biotic and abiotic influences on aggressive interactions within larval <i> Ambystoma</i> assemblages
… limitations that promote competition and predation. To identify the ecological roles of species-specific behavioral patterns within aquatic guilds, I quantified larval intraspecific agonistic behavior among two species of intraguild (IG) predators, <i>Ambystoma opacum</i> and <i>A. …
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Permanent Coexistence for Omnivory Models
… species governed by a mixture of competition and predation. We show the permanence of our models under certain parameter restrictions and include the biological interpretations of these parameter restrictions. Sensitivity analysis is used to obtain important information about meaningful parameter …
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Ecological and logistical considerations toward introducing Heringia calcarata to New Zealand
This thesis outlines research conducted as part of a collaborative project between Virginia Tech and Plant and Food Research New Zealand (PFRNZ) to introduce Heringia calcarata (Loew) (Diptera: Syrphidae) to New Zealand (NZ) for biological control of woolly apple aphid (WAA), Eriosoma lanigerum …
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Stable Carbon and Nitrogen Isotopes of Shell Bound organic Matter, Implications for Modern and Ancient Food Web Dynamics
… that complex trophic interaction like omnivory, intraguild predation, and cannibalism can complicate the traditional approach to estimate trophic position. This dissertation corroborates the use of nano-EA method to study isotopic signatures from shell-associated organic matter not only from …
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FACTORS INFLUENCING THE SPATIAL AND TEMPORAL STRUCTURE OF A CARNIVORE GUILD IN THE CENTRAL HARDWOOD REGION
… provides a suitable prey base and refugia from intraguild predation. Additionally, the varying results from different scales of analyses underscore the importance of considering multiple spatial scales in carnivore community studies.</p>