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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 34 for “"geographical variation"”.

  1. Geographical variation in insect pollinators of generalist Asteraceae.

    Gibson, StephenDepartment of Biological Sciences2017

    cape-town Repository record

  2. Temporal and Geographical Variation in Martian Surface Dust Lifting Processes

    Chapman, RhianThe Open University2018

    … – is a significant Martian climate cycle. The geographical and temporal variation in dust lifting processes were investigated using a Martian Global Circulation Model. The geographical representation of Martian dust lifting by wind stress was used to explore the experimental impact of changes …

    the-open-u Repository record

  3. Geographical variation and evolution in the Middle Devonian brachiopod, Mucrospirifer

    Welch, Delpfine EllenVirginia Tech1991

    … Mucrospirifer, was studied over most of its geographical and stratigraphical range in order to test the theory of punctuated equilibria. Punctuated equilibria holds that most evolution is concentrated in rapid speciation events and that the subsequent lifespan of a species is then …

    vt Repository record

  4. Geographical variation in the genus Astarte (Phylum Mollusca: Class Bivalvia) from the Yorktown and Jackson Bluff formations (early Pliocene) of the Atlantic coastal plain

    McKeever, Lauren JoannVirginia Tech1985

    Geographical variation in taxa must be considered in evolutionary studies. The purpose of the present study is to demonstrate how geographical variation can be measured and documented for a taxon for one slice of time. Future evolutionary studies should document geographical variation for the …

    vt Repository record

  5. An epidemiological study of coronary heart disease and its risk factors in Scotland: The Scottish Heart Health Study

    Smith, William Cairns StewartUniversity of Dundee1989

    … to which these risks factors explained the geographical variation in coronary heart disease, and their relative contribution to the prediction of coronary heart disease in a cohort of men and women.The Scottish Heart Health Study is a study of lifestyle and coronary heart disease risk …

    dundee Repository record

  6. Spatial modeling, covariate measurement error and design issues in environmental epidemiology

    Huque, Md Hamidul2016

    … analysis of administrative data to help explain geographical variation in disease rates. The Conditional auto-regressive (CAR) structure within a hierarchical generalized linear model offers a robust, flexible, and popular class of models for the exploration and analysis of geographical variation …

    uts Repository record

  7. ΒΙΟΜΕΤΡΙΚΗ ΚΑΙ ΚΥΤΤΑΡΟΛΟΓΙΚΗ ΜΕΛΕΤΗ ΤΟΥ ΓΕΝΟΥΣ FRITILLARIA L. ΣΤΗΝ ΕΛΛΑΔΑ

    Zacharof, Evgenia, Ζαχάρωφ, ΕυγενίαΑριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)1987

    … USING 22 VARIABLES) F. GRAECA, DUE TO ITS GREAT GEOGRAPHICAL VARIATION WAS STUDIED SEPARATELY USING DISCRIMINANT ANALYSES. (38 POPULATIONS -11 VARIABLES). FROM THE CYTOLOGICAL POINT OF VIEW ALTHOUGH THE KARYOTYPE IN ALMOST ALL SPECIES APPEARS STABLE (2 PAIRS OF METACENTRIC-SUBMETACENTRIC AND 10 …

    greece Repository record

  8. Variação geográfica em Caluromys philander (Linnaeus, 1758) no Brasil (Didelphimorphia: Didelphidae)

    Caramaschi, Fabiana PellegriniUniversidade Federal do Rio de Janeiro2005

    … despite the lack of comprehensive analyses of geographical variation. This study aimed 1) to map the distribution of C. philander in Brazil, 2) to evaluate the existence of secondary sexual dimorphism in craniometric characters in the species, 3) to analyze the cranial and pelage variability …

    brazil-uerj Repository record

  9. Terpenoid metabolites from three dorid nudibranchs and a new bromotryptamine derivative from the Northeast Pacific sponge Plocamissa igzo

    Dumdei, Eric J.University of British Columbia1993

    … metabolites 61 and 62. A study investigating the geographical variation in the metabolites present in Cadlina luteomarginata along the British Columbian coast revealed the drimane sesquiterpenoid albicanylacetate (72) to be the most widely distributed metabolite. Specimensof the nudibranch …

    ubc Repository record

  10. Ecologia alimentar de morcegos insetívoros de área urbana do município do Rio de Janeiro, RJ (Mammalia: Chiroptera)

    Santos, Reinaldo Souza dosUniversidade Federal do Rio de Janeiro1995

    … reprodutive period). The results do no point to geographical variation in feeding practices. Notwithstanding, the feeding ecology of the bats investigated in this dissertation is closely associated with sazonal change in precipitation. The major conclusion is that, despite living in the same …

    brazil-uerj Repository record

  11. Patterns, Variation and Mental Health Impact of Opioid Prescribing after Burn Injury

    Polychronopoulou, EfstathiaThe University of Texas Medical Branch at Galveston2021

    … setting and explored age, severity, and geographical variation. We found that opioid prescribing declined significantly between 2007 and 2017, however the rates of decline varied significantly among age groups, regions, and injury severity, with patients > 50, the South, and those with …

    utmb Repository record

  12. Phylogeography of Oculina Corals and their Algal Symbionts: Insights into the Origin and Expansion of Oculina Patagonica in the Mediterranean

    Leydet, Karine Eliane PosbicBiological Sciences2022

    … communities harbored by Oculina corals vary geographically, and that this variation does not match the geographical variation of the host’s genetics. Instead, sea surface temperature is better correlated to symbiotic community, particularly in the Mediterranean, which may reflect …

    lsu-thes Repository record

  13. Opioid Prescribing and Opioid-Related Health Outcomes Among Cancer Survivors

    Gibson, Derrick CThe University of Texas Medical Branch at Galveston2023

    … datasets. First, we explored the temporal and geographical variation in long-term opioid therapy among cancer survivors in the United States. We found that long-term opioid therapy rates were highest in the south and lowest in the northeast and that long-term opioid therapy rates peaked in 2012 …

    utmb Repository record

  14. Variação morfométrica e citogenética em Kerodon rupestris (Wied, 1820) (Rodentia: Caviidae)

    Giúdice, Gisele Mendes Lessa delUniversidade Federal do Rio de Janeiro2004

    … that later on was complemented by 2) a geographical analysis, also based on cranial characters, of nine recent populations spread along the geographical distribution of the specie, besides the population of sub-fossils and a population of K. acrobat; and 3) a comparative karyotype …

    brazil-uerj Repository record

  15. Regional variation of mood use in Spanish: A comparison among three Spanish-speaking regions

    Tort-Ranson, Silvia BeatrizVirginia Tech2024

    The current investigation is framed within variationist sociolinguistics, an area of study that examines how language varies and is influenced by linguistic and extralinguistic factors. Variationist research has reported that the use of verbal moods (the subjunctive and indicative) in Spanish is …

    vt Repository record

  16. Evaluating Treatment of Antiphospholipid Syndrome during Pregnancy with Knowledge Synthesis Methods

    Zarek, Judith2024

    … of the exposed group. There was an apparent geographical variation in the utilization of VKA and a lack of systematic investigation. The resultant information gap is wide relative to its exploration in pregnant women with mechanical heart valves. Although heterogeneity of PK analysis methods …

    toronto-retro Repository record

  17. Extending Space-Time Putative Hazard Models to Detect Latent Risk Features

    Al-Hadhrami, Ahmed Yahya

    … is a powerful tool that may help detect similar geographical variation patterns in the risk of two or more related diseases. We have extended the current space-time Bayesian hierarchical shared component models by allowing for possible distance effect. The proposed method is illustrated by …

    south-carolina Repository record

  18. The Breeding Ecology of Least Bitterns (Ixobrychus exilis) at Agassiz and Mingo National Wildlife Refuges

    Arnold, Karen Elizabeth

    … Minnesota. The main objective was to study variation in the breeding ecology of least bitterns across a broad geographic area. Information gathered from nests included: nest success, egg and clutch measurements, hatchling developmental rates, and habitat measurements. Data suggest …

    sdstate Repository record

  19. Essays in labor economics and political economy

    Scognamiglio, AnnalisaMassachusetts Institute of Technology2014

    … first chapter shows that there is substantial geographical variation in the use of cesarean sections in Italy. Such variation is not driven by medical need and higher cesarean rates are achieved by performing the procedure on less and less appropriate patients. I find no evidence that high-use …

    mit Repository record

  20. Identity and Social Structure in Early Modern Politics: How Opportunities induced Witch Trials in Scotland, 1563 - 1736

    Mitschele, Anna2013

    … the combination of the extreme temporal and geographical variation of witch trials on the one hand and the conspicuous over-representation of gentry on the other hand has hitherto remained a puzzle. My dissertation solves this puzzle by showing that witch trials emerge out of identity …

    columbia-diss Repository record

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