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 109 for “"Size-Structure"”.
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Size Structure and Intraguild Interactions between Two Ambystoma Species
… 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 interactions in …
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Investigating and modelling the body size structure of benthic communities
… were investigated in terms of their body size distributions at three environmentally contrasting study sites: (i) a shallow-water location on the Fladen Ground, North Sea, (ii) a deep-water location in the Faroe-Shetland Channel and (iii) and a mid-slope oxygen minimum zone location on the …
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Genetics of Osteoporosis - Studies on bone size, structure and strength in the rat
… a bone’s ability to resist fracture, including size, structure and strength; therefore identification of the genes underlying several bone characteristics will help elucidate the pathogenesis of fracture risk. Dissection of the genetic determinants of osteoporosis has been more effective in …
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Modelling the Interaction of Fishing with Size Structure, Dimorphism, and Egg Production of Clawed Lobsters
… and recruitment or to preserve specific size classes to increase reproductive output. Consequences of these strategies could include variation from a natural size structure of the population, exaggerated sexual dimorphism, skewed sex ratios, and suboptimal mating conditions. To examine …
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Temporal and spatial changes in the abundance and size structure of copepods in the southern Benguela : 1988 to 2000
… spatial variability in abundance and community structure of copepods in the southern Benguela, by estimating changes in abundance (No. mol) of individual species and size-classes. The relative abundance of Calanus agulhensis, Calanoides carinatus, Centropages brachiatus, Metridia lucens. Oithona …
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Effects of light and nutrient gradients on the taxonomic composition, size structure and physiological status of the phytoplankton community within a temperate eutrophic estuary
… communities in Southampton Water. The size structure and species composition were investigated during 2002 and 2003, with special attention to nanophytoplankton (cells < 5µm in diameter). The main sampling stations were Empress Dock and NW Netley in both years, and Calshot and Horse …
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The Influence of Population and Community Variables on Bluegill, Lepomis Macrochirus, Life Histories: Implications for Growth Rates, Timing-of-Maturation, and Population Size Structure
… but responds facultatively to the social structure of the extant population. To better understand cues associated with these social interactions, I conducted an experiment to isolate potential visual, chemical, and physical cues associated with spawning individuals. Results from this …
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The Implications of the Target-Area Hypothesis on the Population Dynamics of the Spotted Spiny Lobster, <i>Panulirus guttatus</i>
… but should also have more evenly distributed size structures. These differences in size structure among populations in isolated habitats of differing size could have profound impacts on the local reproductive success of species if mating is size-dependent or if fecundity is related to male or …
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Temporal and spatial variability in a copepod community off St Helena Bay in 2000/1
… forces behind changes in copepod community structure in the Benguela upwelling region are examined. For this study, monthly changes in copepod size structure and species composition were examined at St Helena Bay in 2000/1 in relation to upwelling, phytoplankton and fish. The copepod …
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Structure and Dynamics of Largemouth Bass Populations in Eastern South Dakota Glacial Lakes and Large Impoundments
… seasonal variation in relative abundance, size structure, and body condition for largemouth bass Micropterus salmoides collected by night electrofishing from Enemy Swim Lake, South Dakota, from May through November of 2000 and 2001. Mean catch per unit effort (CPUE; number of stock-length …
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Size-structured competition and predation in red-eyed treefrog tadpoles
Body size is important in determining the outcome of competition and predator-prey interactions. Size structure of a population (i.e. relative proportion of large and small conspecifics) may be particularly important in organisms with prolonged breeding periods and rapid growth where populations …
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The response of mobile intertidal invertebrates to subsistence harvesting in Northern KwaZulu-Natal
… i) abundance of species groups. ii) size structure of each organism and iii) community structure of mobile organisms. Abundance analysis revealed no significant difference between harvested and no harvested regimes for most species' groups, excepting Snails and Chitons. Snails were …
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Seasonal Variation in Sampling Indices for Fish Populations Collected From the Missouri River Below Fort Randall Dam, South Dakota
… used to calculate relative species composition, size structure, relative weights (Wr), and catch per unit effort (CPUE). These indices were then assessed for seasonal trends. Seasonal fluctuations were apparent in relative species composition, size structure, Wr, and CPUE. Relative species …
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The utilization of littoral and estuarine habitats by fish in the Southwestern Cape
… to determine the species composition, abundance, size structure and seasonality of fish and to examine the extent to which they are influenced by environmental factors; 2) to describe the diets and patterns of feeding of the fish and to assess their impact on the food resources; and 3) to …
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Aspectos sazonais de ocorrência, tamanho e dieta de duas espécies de Engraulidae (Teleostei clupeiformes) na Baía de Sepetiba, Rio de Janeiro
… to July 1985. The aspects of ocurrence, seasonal size structure and growth rate determination, analysis of diet and of morphologic structures involved with feeding are examined for both species. The definition of the diurnal feeding activity cycle of A. januaria is presented. The importance of …
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The endangered European native oyster Ostrea edulis (L) and creation of Marine Conservation Zones: a win – win scenario for fisheries and conservation?
… of its abundance and distribution and age structure was needed to ensure designation of Marine Conservation Zones (MCZ). Between 2012 – 2015, Essex Wildlife Trust, Blackwater Oystermans Association and the University of Essex undertook a study of density and distribution of O. edulis across …
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The Role of Zooplankton in Regulating Carbon Export and Phytoplankton Community Structure: Integrating Models and Observations
… to competitive exclusion. When implemented in a size-structured NPZ model, stronger switching increases the evenness of the distribution of biomass between coexisting size classes, which is used as a proxy for taxonomic diversity. I also describe a particular characteristic of the Kill-the-Winner …
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Influence of Reproductive Habitat and Potential Competition on Yellow Perch Populations in Eastern South Dakota Lakes
… perch recruitment tend to be shallow and lack structure. Because many lakes in South Dakota have limited structure, management efforts may include habitat manipulation as a tool to enhance yellow perch recruitment. The objective of this study was to determine the contribution of eggs deposited …
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Structure, Dynamics, and Movement Patterns for Crappies in South Dakota Waters
… black crappie recruitment, growth, mortality, size structure, and condition in South Dakota waters. Recruitment stability index (RSI) values were best correlated with shoreline development index and watershed: lake area ratio. Growth was inversely correlated with catch per unit effort (CPUE) …
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The Effect of "Casitas" on Lobster Biology and Fishery Sustainability in the Bahamas
<p>“Casitas” (artificial table-like structures) are a commercial fishing gear used to harvest Caribbean spiny lobster (<em>Panulirus argus</em>) in the Caribbean and in The Bahamas, where lobster is the most valuable fishery. Yet, casitas are largely unregulated in The Bahamas and they may threaten …
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