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 10 of 10 for “"density dependent growth"”.
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Studies of SV40-transformation and the Loss of Growth Factor Requirements
… induced the loss of several specific growth factor requirements. In particular, SV40 transformed 3T3 fibroblasts had a significantly reduced growth requirement for insulin. A reduced insulin requirement was also observed in several other transformed cell lines. Dose response studies …
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Non-Linear Density Dependence in a Stochastic Wild Turkey Harvest Model
… gallopavo silvestris</I>) harvest models assume density-independent population dynamics despite indications that populations are subject to a form of density dependence. I suggest that both density-dependent and independent factors operate simultaneously on wild turkey populations, where the …
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Ecology of Fish Communities in Nebraska Sandhill Lakes
Fish populations recruitment, growth, and mortality are regulated by biotic and abiotic factors. The first study objective was to evaluate the influence of biotic and abiotic characteristics on the fish communities in Nebraska Sandhill lakes. I selected 30 lakes and measured fish community …
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A test of the variable nature of density-dependent mortality in fish populations
… in power-plant cooling systems was questioned. Density-dependent dynamics were hypothesized as variable, not constant, making previous analyses based on constant density-dependent or density-independent mortality in error. This hypothesis was tested with a simulation model based on complex …
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THE EFFECTS OF RETINOIC ACID ON CELLULAR TRANSFORMATION AND TUMORIGENESIS INVOLVING CELLS WITH KNOWN ONCOGENES (VITAMIN A, RETINOIDS, RETROVIRUS)
… sensitive to RA. No inhibition of anchorage- or density-dependent growth was observed. Therefore, since these in vitro markers of transformation indicated a lack of effectiveness of RA on carcinomas containing a c-ras gene, retrovirally transformed cells were tested for RA sensitivity. Kirsten …
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Resource competition and soft selection in Sabatia angularis
… are heterogeneous and individual fitness is dependent on the competitive neighborhood within which it finds itself. In situations where individual fitness is a function of the density and genetic composition of competitors, selection is considered ‘soft’. The extent to which soft selection …
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Impacts of population-level reproductive success on recruitment dynamics in largemouth bass (Micropterus salmoides)
… is an important driver of recruitment. Density-dependent survival of age-0 Largemouth Bass after parental care ceases may compensate for variation in reproductive success earlier in the first year of life. The chapters of this dissertation present the findings of one study that …
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Recovery From and Effects of a Catastrophic Flood and Debris Flow on the Brook Trout (<i>Salvelinus fontinalis</i>) Population and Instream Habitat of the Staunton River, Shenandoah National Park, VA
… of the debris flow on movement, activity, and growth of fish in the debris flow affected and unaffected areas of the stream. Post-recolonization movement and activity were monitored using two-way fish traps (weirs), mark-recapture techniques, and radio telemetry. The weirs failed to produce any …
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Interannual Variation in Larval Yellow Perch Abundance in Eastern South Dakota Glacial Lakes and Relation to Sympatric Walleye Populations
… long-term larval perch abundance to walleye growth and condition in six eastern South Dakota glacial lakes. For my first objective, yellow perch egg skeins were collected from nearby lakes in spring 2007 and 2008 and transferred to a laboratory tank system. Egg skeins were split into multiple …
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Density Effects on Growth, Survival and Diet of June sucker (Chasmistes liorus): A Component Allee Effect in an Endangered Species.
Density-dependence is considered one of the most important regulators of population growth, and it has been documented across a wide variety of species. Typically, population growth rate and components thereof decline with increasing density (i.e., negative density-dependence); however, in species …