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 13 of 13 for “"Population size structure"”.
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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
… are complex and can be shaped by myriad population- and community-level variables. I conducted a series of experiments to examine aspects of bluegill, Lepomis macrochirus, life histories in an attempt to quantify variables influencing growth and maturation rates of individuals, and to …
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The Implications of the Target-Area Hypothesis on the Population Dynamics of the Spotted Spiny Lobster, <i>Panulirus guttatus</i>
… have meroplanktonic larvae and open population dynamics, so immigration to populations in isolated benthic habitats is primarily by pelagic larval recruits. Thus, recruitment to isolated habitat “islands” may be more continuous and predictable on large islands than on small ones. …
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Demography of the spotted turtle (clemmys guttata) in Illinois
… no comprehensive demographic analysis of the two populations. I investigated the population size, structure, and demographic behavior of C. guttata populations at Lockport and Romeoville Prairie Nature Preserves by supplementing an existing dataset by conducting capture-mark-recapture in …
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Distributional relationships among subtidal algae, sea urchins and reef fish in northeastern New Zealand
… rocky reefs, a more detailed study of its population characteristics was initiated. The population size structure of C. flexuosum on coralline flat areas was markedly different from that of the same species in sites sheltered from wave action. These differences occurred at both offshore …
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Managing Muskellunge in the New River, Virginia: Effective Regulations and Predation on Smallmouth Bass
… because of their capacity to alter fish populations. Such a conflict certainly exists between the Muskellunge Esox masquinongy and Smallmouth Bass Micropterus dolomieu fisheries of the New River, Virginia. Following the institution of a 42-in minimum-length limit (MLL) on Muskellunge, …
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Latitudinal variation in plankton size spectra along the Atlantic Ocean
Abundance-size distributions of organisms within a community reflect fundamental properties underlying population dynamics. These include characteristics such as predator to prey biomass ratios, given the relationships that exist between body mass and metabolic activity, and between body mass and …
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Ecological significance of variation in Themeda triandra Forsk : a case of intra-specific divergence in life history strategies?
… different selection pressures in the different populations. Observations were made on reproductive and vegetative traits in field populations in the four study areas and on plants grown from clonal material and seeds in a glasshouse to determine key axes of variation. Population responses to …
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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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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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Ecological studies of isopoda and diplopoda in dune grassland
Distribution, population dynamics, biomass and population production of macrodecomposers have been studied in order to clarify the role of four species in the processes of energy transfer in a dune grassland ecosystem. The-species worked on were Armadillidiun vulgare, Porcellio scaber, Philoscia …
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Ocelot Density and Home Range in Belize, Central America: Camera-Trapping and Radio Telemetry
… large numbers for their fur, causing declines in population abundance across their range. In recent decades protection measures (e.g. CITES) and decreased public demand for ocelot fur resulted in declines in hunting pressure. Do to their elusive nature there is little known about ocelot population …
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Bluegill Seasonal Habitat Selection, Movement, and Relationship to Angler Locations in a South Dakota Glacial Lake
… changes in movement rates and core home range size across a full year, and 3) compare spatial distributions and habitat fished by bluegill anglers to habitat use by bluegills across seasons. Radio telemetry was used to examine seasonal habitat use and movement patterns of bluegills in Enemy …
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Influence of Reproductive Habitat and Potential Competition on Yellow Perch Populations in Eastern South Dakota Lakes
<p>Yellow perch Perea jlavescens populations often have variable recruitment throughout their range. In eastern South Dakota, glacial lakes with erratic yellow perch recruitment tend to be shallow and lack structure. Because many lakes in South Dakota have limited structure, management efforts may …