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 1176 for “"dispersal"”.
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Seed Dispersal by Aquatic Turtles
Seed dispersal capabilities by several common aquatic turtles in Southwestern Missouri were investigated. Fecal matter was first obtained during a summer seed survey in which stinkpots (Sternotherus odoratus), river cooters (Pseudemys concinna), spiny soft-shell turtles (Apalone spinifera), and …
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Protoplanetary disc evolution and dispersal
… can reproduce the observed disc evolution and dispersal time-scales. The main question this thesis attempts to address is: Can photoevaporation provide a dominant dispersal mechanism for the observed population of young stars? Photoevaporation arises from the heating that high energy (UV and …
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Larval dispersal between hydrothermal vent habitats
… species, but the exact mechanism and controls of dispersal are unknown. A description of larval distribution patterns, for which reliable identification of vent larvae is necessary, is critical to understanding larval dispersal. In gastropod species, the retention of the larval shell on the adult …
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Dispersal Behavior Of Mosquitofish (gambusia Holbrooki)
… ecosystems that they inhabit. Information on dispersal behavior will help better understand and predict mosquitofish metapopulation dynamics and invasions. I experimentally tested dispersal behavior of individual mosquitofish under a range of laboratory conditions relevant to field situations. …
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Larval dispersal between hydrothermal vent habitats
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1996.
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Seed dispersal in South African trees: with a focus on the megafaunal fruit and their dispersal agents
Seed dispersal is a key process. It is important in plant population biology because it influences the fate of seeds and the probability of recruitment, in plant biogeography since dispersal mode can influence the distribution range and rate of response to environmental change and habitat …
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Morphodynamics and driftwood dispersal in braided rivers
… supply and log properties (size and shape) on dispersal patterns; c) investigating wood remobilisation induced by discharge fluctuations and bed reworking; and d) analysing long-term wood storage volume and budget. A combination of field-scale direct observations, remote sensing techniques and …
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Factors affecting the dispersal of coarse fish
… factors affecting the lateral and longitudinal dispersal of juvenile and adult (wild and stocked) coarse fish in three lowland river catchments, namely the River Trent, the Yorkshire Ouse and the River Roding.A literature review was carried out to review the influence of floods on riverine …
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The Effects of Dispersal on Macroecological Patterns
… patterns are often attributed to the dynamics of dispersal (e.g. dispersal limitation or widespread dispersal). However, few studies actually measure dispersal to determine if dispersal rates are commensurate with the observed macroecological patterns. In this dissertation, I use population …
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Aspects of plant dispersal in the southwestern Cape with particular reference to the roles of birds as dispersal agents
The dispersal of plants with particular attention to the roles birds play as dispersal agents was studied in the southwestern Cape, South Africa from 1983 to 1985. The research was organized as ten inter-related studies, each with an independent data base. Each chapter focused on a different scale …
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Animal dispersal of American ginseng (Panax quinquefolius L.)
… demographic and conservation based studies. Seed dispersal is a critical component of ginseng demography lacking empirical evidence for potential dispersal mechanisms. To date, gravity is considered to be the primary mechanism of dispersal, but the production of red, fleshy berries during the late …
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Puma Dispersal Ecology in the Central Rocky Mountains
… within a metapopulation, connected through dispersal, is important to basic and applied ecology. However, a considerable gap exists in our knowledge of the influence landscape heterogeneity has on dispersal and its consequences. We examined landscape effects on dispersal and its consequences …
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Puma Dispersal Ecology in the Central Rocky Mountains
… within a metapopulation, connected through dispersal, is important to basic and applied ecology. However, a considerable gap exists in our knowledge of the influence landscape heterogeneity has on dispersal and its consequences. We examined landscape effects on dispersal and its consequences …
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Proximal Causes of Dispersal in Yellow-Bellied Marmots.
… and individual behavioral phenotypes, on dispersal of yearling yellow-bellied marmots was investigated. Two marmot colonies near Gothic, Colorado were studied; one was treated as an experimental colony from which all adults were removed, the second as a control was left undisturbed. …
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