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 4 of 4 for “"top-down forces"”.
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Diet Breadth Evolution and Diversification of a Generalist Insect Herbivore
… still unclear. It is known that the selective forces from natural enemies (top-down) and the host plants (bottom-up) influence an herbivore's diet breadth. In my meta-analysis evaluating the relative important of top-down and bottom-up forces on insect herbivore fitness, I found that herbivores …
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Seed predation along an elevational gradient in the Tropical Andes, Peru
… arises due to seed predator regulation via top-down forces in the lowlands giving way to bottom-up (productivity) regulation at mid to high elevations.
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Death by a thousand cuts: the role of pesticides, predators, and habitat patch characteristics on wild bee and insect communities
… have described important, yet inconsistent, top-down effects on bees. In Chapter 2, I simultaneously evaluate the roles of top-down and bottom-up forces on bee communities and foraging behavior using the ongoing reintroduction of a top predator. The top-down forces of eastern collared lizards …
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FACTORS INFLUENCING THE SPATIAL AND TEMPORAL STRUCTURE OF A CARNIVORE GUILD IN THE CENTRAL HARDWOOD REGION
… competition within the same trophic level, and top-down forces from higher trophic levels. Carnivore guilds play a vital role in the broader ecological community by stabilizing or destabilizing food webs. Consequently, factors influencing the structure of carnivore guilds can be critical to …