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 18 of 18 for “"population demography"”.
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Population demography of lark buntings: post-fledging survival, fecundity, and breeding decisions
… bird species have experienced the largest population declines of any terrestrial avian group in the past four decades in North America. Lark buntings (Calamospiza melanocorys), endemic to the grasslands of North America, have declined by 2.5% per year in Colorado and 2.1% per year in the …
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The effects of clonal reproduction on population demography, genetic structure, and mating pattern of <i>Dicentra canadensis</i>
… of maintaining dual reproductive strategies to population growth and genetic structure is still poorly understood and evidence for how the interplay between pollinators and clonal structure influences sexual reproduction is scarce. I investigated the effects of clonal reproduction on population …
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Demographic and genetic variability in Cape Dwarf Chameleons, Bradypodion pumilum, withink a fragmented, urban habitat
… field of conservation biology often investigate population demography and genetic variability for species inhabiting fragmented landscapes. Findings from such work enable effective conservation management, maximizing viability for potentially imperiled populations. Previous research has relied …
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Conservation of Grassland Birds in an Agricultural Landscape: The Importance of Habitat Availability and Demography
… understanding how life history traits influence population demography and emphasize the importance of surrounding farmland, especially for post-breeding females and post-fledging juveniles. Additional experimental creation of more isolated grassland tracts would help test the hypothesis that …
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A planning paradigm for electrification in Sub-Saharan Africa : a case study of Tanzania
… rapid changes in macro and micro-economies, population demography and migration, and signs of climate change.
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Spatial Behavior and Population Estimation of the Alligator Snapping Turtle (Macrochelys Temminckii)
… freshwater turtle species in North America. Populations have been subjected to over a century of commercial and recreational harvest, causing large scale population declines. Additionally, their aquatic habitat has been subjected to largescale anthropogenic degradation. Very few robust …
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Patterns of recruitment, growth and mortality of the mussel, Mytilus Galloprovincialis in relation to wave exposure and tidal elevation
Population patterns of the alien mussel Mytilus galloprovincialis were investigated at two locations on the west coast of South Africa: Camps Bay and Groenrivier. Specifically, wave exposure and zonation were examined for their effect on mussel cover and total density, mussel size and recruit …
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Population Biology Of A Coastal Dune-Dwelling Spider (Arctosa Sanctaerosae) Along The Hurricane Disturbed Northern Gulf Of Mexico Coast
… The data presented here explore the status of populations of this species spanning the entire known range and the factors influencing population demography. These findings demonstrate the significant impact of storms on both disturbed and undisturbed habitat and reveal factors influencing the …
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Ecology and evolution of invasive maple tree species
… to employ it. Based on various methods such as population demography contrasts, meta-analytical statistics and quantitative genetics, this· project sought to highlight specific environmental factors, species functional traits and evolutionary processes that drive the success of maple tree …
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Host-parasite co-evolution and genetic variation at the major histocompatibility complex in the Trinidadian guppy (poecilia reticulata)
… I find evidence to suggest that upstream populations of guppies have small population sizes and reduced gene flow into the population. However, these populations of guppies maintain similar levels of MHC polymorphism to that of larger populations of guppies further downstream. The …
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Landscape and population ecology of ring-necked pheasants
… linking field- and landscape-scale management to population-level responses. I collected detailed demographic data on ring-necked pheasants on 14 public and private grasslands in east-central Illinois. I monitored 108 nests, 38 broods, and the survival and habitat use of 108 adult female …
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Using population ecology to inform the conservation of Nevada's rare plants
Population ecology is a fundamental tenet of conservation biology. Estimating population size is a necessary first step in assessing species vulnerability, and to the subsequent examination of population viability, prediction of extinction risks, and evaluation of conservation objectives. …
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Genetics, demography and modeling of freshwater mussel (Bivalvia: Unionidae) populations in the Clinch River, U.S.A.
… exhibited different trends for long-term population sizes for each species during the Holocene (~10,000 ya to present); namely, E. brevidens has declined over time, E. capsaeformis has remained stable, and L. fasciola has expanded. Long-term effective population size (Ne) was smallest in …
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BEHAVIORAL ECOLOGY OF ORYZOMYS PALUSTRIS (MARSH RICE RAT) IN COASTAL TEXAS: IMPLICATIONS FOR THE LIFE-HISTORY STRATEGY OF BAYOU VIRUS (BAYV)
… of hantavirus seroprevalence levels in host populations at finer scales have proven elusive, as rodent phenotypic responses to environmental context and sympatric species can drive infection patterns, and these relationships are usually non-linear and often extremely complex. The marsh rice …
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Sociality in the common mole-rat, Cryptomys hottentotus hottentotus : the effects of aridity
… to ecological constraints, foraging behaviour, population demography, reproductive biology and aggressive behaviour were compared between an arid and a mesic population of C. h. hottentotus, to assess how inter-habitat divergence in ecological attributes has influenced social behaviour within …
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Geographic patterns of speciation in West and Central Africa: The role of rivers, mountains, and refugia
… and by using a combination of phylogenomic, population genomic, demographic and niche modeling analyses to gain a better understanding of the responses of West and Central African taxa to the major climatic and geographic events shaping African rainforest biota. Chapter 1 examines the role …
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Befolkning, samhälle och förändring : Dynamik i Halmstad under fyra decennier
… are characterised by different patterns in the population. The periods are also characterised by changes in the labour market and the employment of the population. These changes are analysed through the interplay between actors in the locality and actors and influences from outside the locality. …
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A Horseshoe Crab (Limulus polyphemus) Demographic Study
We examined various aspects of horseshoe crab populations in conjunction with BioWhittaker, a biomedical company that bleeds horseshoe crabs (Limulus polyphemus) and utilizes their blood for biomedical purposes. We examined mortality rates of bled and unbled crabs by holding crabs in tanks for …