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 39 for “"Colony size"”.
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Determinants of gemmae output in the liverwort Lophozia ventricosa
… The population parameters investigated included colony size, colony shoot density, number of gemmae per shoot, proportion of gemmiferous shoots and gemmiferous shoot density. The gemmae output in a colony was calculated as the product of the number of gemmae per shoot, colony size and gemmifeorus …
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Sex Allocation in the Caribbean Coral, <em>Porites astreoides</em> (Lamarck)
… to determine whether sex allocation varies with colony size or along a light-energy gradient. Tissue samples were collected at depths of 6, 13, 18 and 27 m and the surface area of each colony was measured. Tissue samples were histologically sectioned and mounted on slides for quantification of …
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The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts
… ranged from .04 to 540 colonies per m3. Colony morphology of common genera and species is described and three new shell-less species which reach a length in excess of 1 m are discussed in detail. Some simple behavioral responses are documented, including control of colony buoyancy and …
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Assessing long-term changes in chironomid assemblages linked to past fluctuations in Leach’s Storm-Petrel populations on islands in the Western Atlantic Ocean
… linked to reconstructed changes in the seabird colony size of the Leach’s Storm-Petrel in ponds located off the Canadian East coast on Baccalieu Island, Newfoundland, and Grand Colombier Island, Saint Pierre and Miquelon, France, to qualitatively reconstruct past changes in dissolved oxygen …
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An experimental approach to assess the role of nest predation in the population dynamics of the sociable weaver (Philetairus socius)
… acting as the controls. Reproductive output, colony size, dispersal events and several environmental variables were measured between 2010 and 2015. This was done to determine (1) what effect nest predator exclusion had on reproductive output; (2) how this related to colony and population size …
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Influence of Grain Size and Widmanstätten Colonies on Variability of Tensile Properties of Forged Ti-6Al-4V
… may affect the mechanical properties were: grain size, Widmanstätten colony size, and volume fraction of the β phase. Based on measurements it was determined that a smaller Widmanstätten colony size found to be roughly 120 microns/colony was associated with a larger yield strength and UTS than …
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Dynamics of Self -Organization of Ramified Patterns in an Electromechanical System
… on the net energy collection rate of the ant colony. From this, we predict that there should exist both an optimal and maximal colony size.
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Colony site selection in bank swallows
Bank Swallow colony site selection was studied on a 6,129 hectare area in the Qu'Appelle Valley near Fort Qu'Appelle, Saskatchewan. Comparison of 60 banks used by Bank Swallows with the 349 unused sites showed that taller, vertical, more recently excavated sites with sand or fine gravel soils and …
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Nanoscale and microscale approaches for engineering the in vitro cellular microenvironment
… control cell migration and to restrict cell or colony size, cells and proteins were patterned by using molding or printing methods. Poly(ethylene glycol)-based molecules and polysaccharides were used to control cell-substrate interactions and to prevent cell adhesion on specific regions of a …
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Comunidades recifais do Arquipélago dos Abrolhos, BA, com ênfase em corais (Cnidaria: Scleractinia e Milleporidae): aspectos metodológicos e comparações entre locais
… quadrats and intercept line transect methods. Colony size and inclination, the distances from random points to the nearest colony and between nearest colonies of the same species were evaluated for the five most frequent or abundant coral species (Agaricia agaricites, Favia gravida, Mussismilia …
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Mechanisms for the Evolution of Superorganismality in Ants
… they exhibit very high levels of within-colony cooperation, and very low levels of within-colony conflict. The evolution of such superorganismality has occurred multiple times across the animal phylogeny, and indeed, origins of multicellularity represent the same evolutionary process. …
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Sedimentation threats to Red Sea corals : an ecological study of reefs in the Hurghada Region, Egypt
… coral cover, species richness, diversity, mean colony size of branched corals and the abundance of algal feeding fish. Other parameters such as non-carbonate sediment, turbidity and percentage of mud in bottom sediment affected corals and fish to various degrees.Sedimentation did not appear to …
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Simulating the evolution of recruitment behavior in foraging Ants
… the interaction of food heterogeneity and colony size in their effects on the behavior of foraging ant colonies, we built agent-based models of the foraging and recruitment behavior of harvester ants of the genus Pogonomyrmex. We optimized the behavior of these models using genetic …
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Management of seal tourism in New Zealand – tourism and the New Zealand fur seal in the Bay of Plenty
… during tourism activities, including: location, colony size, sex/age classes, time of day, duration of stay, distance, month and stage in the breeding season. Seals-swims were usually observed from on board a licenced marine mammal tour vessel (n = 16 seal-swims), and controlled approaches were …
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The evolution of social traits and biodiversity in the ants.
… small highly related colonies. I show that group size is a significant trait in the evolution of sociality in ants, predicting the probability of a species having polymorphic workers, or of being polyandrous. I also show that the change in these traits is correlated between ancestral nodes on the …
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Weaving through the matrix: investigating the influence of urban land use on weaver bird movements into and out of Cape Town wetlands
… the urban matrix, as well as patch isolation, size and quality, had on weaver bird movement into and out of wetland sites in Cape Town, a growing city within a global biodiversity hotspot. Weaver bird movement data from 42 wetland sites were obtained through a long term mark - release - …
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Simple Physical Approaches to Complex Biological Systems
… equation for the electrostatic potential of any size biomolecule is derived using spherical geometry. The solution is tested both on an ideal sphere relative to an exact solution and on a multitude of biomolecules relative to a numerical solution. In all cases, the bulk of the error is within …
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Climate change, variable colony sizes and temporal autocorrelation : consequences of living in changing environments
… In the third part of the thesis, I tested why colony sizes of the sociable weaver are highly variable. The high variation of colony sizes is surprising, as in studies on coloniality it is often assumed that an optimal colony size exists, in which individual bird fitness is maximized. Following …
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The Effect of Environment on Virulence Factors and Resistance of Mucoid Strains of Pseudomonas Aeruginosa
… produced two major phenotypes which differed in colony size and appearance on nutrient agar. Both showed differences in the production of the virulence factors, protease, elastase, lipase, phospholipase C and pyocyanine and fluorescent pigments under different nutrient limitations. Growth …
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Sociobiology of the hypogaeic army ant Dorylus (Dichthadia) laevigatus Fr. Smith
… or ecological impact, nothing was known about colony size and composition, nesting habits, or worker polymorphism for D. laevigatus or any other hypogaeic Dorylus species prior to my work. By observing and eventually excavating a colony, I showed D. laevigatus to have a much smaller colony size …
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