Sökning: "population decline"

Visar resultat 26 - 30 av 348 avhandlingar innehållade orden population decline.

  1. 26. Spatial and temporal population dynamics in the mountain tundra – mesopredator and prey

    Författare :Rasmus Erlandsson; Anders Angerbjörn; Dennis Murray; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; population dynamics; cyclic; mountain tundra; arctic fox; Norwegian lemming; small rodents; mesopredator; predation; survival; reproduction; zoologisk ekologi; Animal Ecology;

    Sammanfattning : It is well known that competition, predation and fluctuating food resources can have strong effect on individual fitness and population dynamics. The complexity of natural systems can make it complicate to disentangle those processes, but environments with relatively simple food webs, and strong cyclic population dynamics offer contrasting conditions resembling experimental treatments. LÄS MER

  3. 27. Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae)

    Författare :Kerstin Isaksson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantitative genetics.; AFLP; local genetic variation; relict populations; fragmentation; small populations; sporophytic self-incompatibility; extinction; threatened species; Inbreeding depression; population structure;

    Sammanfattning : Landscape change in Europe has caused the decline of many grassland species. Tephroseris integrifolia (Asteraceae) is one species which has declined rapidly in Sweden since the 19th century. LÄS MER

  4. 28. Change and variability in cognitive performance in old age. Effects of retest, terminal decline, and pre-clinical dementia

    Författare :Valgeir Thorvaldsson; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Aging; cognition; longitudinal; retest effects; terminal decline; pre-clinical;

    Sammanfattning : The focus of the presented studies was to provide population estimates of change and variability in cognitive performance in old age. Data was drawn from the Gerontological and Geriatric Population Studies in Gothenburg, Sweden (H70). In study I retest effects were evaluated on level of performance in five cognitive abilities. LÄS MER

  5. 29. Chronic obstructive pulmonary disease (COPD) : prevalence, incidence, decline in lung function and risk factors

    Författare :Anne Lindberg; Bo Lundbäck; Rune Lundgren; Lars-Gunnar Larsson; Sven Larsson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Medicine; Chronic Obstructive Pulmonary Disease; Prevalence; Incidence; Decline in Lung Function; Risk Factors; Medicin; Dermatology and venerology; clinical genetics; internal medicine; Dermatologi och venerologi; klinisk genetik; invärtesmedicin; lungmedicin; Lung Medicine;

    Sammanfattning : The Obstructive Lung Disease in Northern Sweden (OLIN) Studies started in 1985 as an epidemiological project with the aim to detect preventable risk factors for obstructive lung diseases and allergy. In recent years there has been a focus also on obstructive sleep apnoea syndrome (OSAS) and chronic obstructive pulmonary disease (COPD) besides asthma and allergy. LÄS MER

  7. 30. Cerebrovascular disease and dementia : a population-based study

    Författare :Li Zhu; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Antihypertensives; apolipoprotein E; cognitive decline; dementia; incidence; prevalence; stroke;

    Sammanfattning : Several vascular factors have been related to cognitive decline and dementia. One of the recent efforts has been focused on stroke, which could be prevented with appropriate measures. The data for this thesis were derived from the baseline and first follow-up of the Kungsholmen Project. LÄS MER