Sökning: "population decline"

Visar resultat 1 - 5 av 279 avhandlingar innehållade orden population decline.

  1. 1. Genomics of population decline

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tom van der Valk; Katerina Guschanski; Aylwyn Scally; [2019]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; genetic diversity; minimal-invasive samples; population decline; inbreeding; genetic purging; eastern gorillas; Dryas monkey; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : With human populations forecasted to grow in the next decades, many mammals face increasing anthropogenic threats. The consequential population declines are a precursor to extinctions, as small populations are not only more sensitive to stochastic events, but reduction in population size is generally also followed by a decrease in genetic diversity, which in turn reduces adaptive potential and fitness of the population. LÄS MER

  2. 2. Population ecology and management of waders breeding on coastal meadows

    Detta är en avhandling från Richard Ottvall, Department of Ecology, Animal Ecology, Ecology Building, SE-223 62 Lund

    Författare :Richard Ottvall; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal ecology; Djurekologi; grazing management; population modelling; demography; genetic structure; population decline; Tringa totanus;

    Sammanfattning : Many wader (Charadrii) populations are declining throughout in Europe, but the underlying causes are often poorly known and diverse. To fully grasp the reasons behind declines in vulnerable wader populations, it is crucial to understand the demography. LÄS MER

  3. 3. Population History and Non-invasive Monitoring : Use of low copy number DNA in Conservation Genetics

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Øystein Flagstad; Ettore Randi; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; genetic tagging; immigration; loss of genetic variability; non-invasive molecular techniques; population decline; Swayne’s hartebeest; wolf; wolverine; Biologi; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi; ekologisk botanik; Ecological Botany;

    Sammanfattning : Conservation genetics research is increasingly becoming an integrated part of the management of small and endangered populations. In this thesis I developed tools for genetic analysis of low copy number sources of DNA, such as old teeth from museum specimens as well as field-collected faeces and urine. LÄS MER

  4. 4. On starlings and farming: population decline, foraging strategies, cost of reproduction and breeding success

    Detta är en avhandling från Måns Bruun, Departmen of Ecology, Animal Ecology, The Ecology Building S-223 62 Lund, Sweden

    Författare :Måns Bruun; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; breeding success; foraging strategies; intensification; agricultural methods; population decline; farmland bird; cost of reproduction; Animal ecology; Djurekologi;

    Sammanfattning : The European Starling Sturnus vulgaris as many other farmland bird species has been declining during the last decades. The cause of these declines is generally believed to be changes with in agricultural methods affecting breeding and survival of birds. LÄS MER

  5. 5. The biology of cognitive decline and reduced survival in Parkinson disease prognostic factors in a population-based cohort

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :David C Bäckström; Lars Forsgren; Jan Linder; Niklas Lenfeldt; Jan Aasly; [2019]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Parkinson disease; multiple system atrophy; progressive supranuclear palsy; natural history; cognitive impairment; dementia; predictors of mortality; cerebrospinal fluid biomarkers; prospective; population-based; Neurology; neurologi;

    Sammanfattning : Parkinson disease (PD) is a progressive neurodegenerative disease that affects about 1% of the population over 60 years. The cardinal symptoms are motor disabilities but cognitive decline is also common. About 50% of all persons with PD develop dementia within 10 years after disease onset. LÄS MER