Sökning: "population decline"
Visar resultat 11 - 15 av 346 avhandlingar innehållade orden population decline.
11. Death Penalty in Decline : Brakes and Accelerators in U.S. State Legislatures
Sammanfattning : After reaching a peak during the 1990s, death sentences and executions havedeclined throughout the states. During this time, a steady stream of states havetaken the step to join a growing group of abolitionist states, or alternatively, have a moratorium on executions in place. In a parallel development, supportfor the death penalty among the U.S. LÄS MER
12. Population Dynamics and Conservation of the Sand Lizard (Lacerta agilis) on the Edge of its Range
Sammanfattning : The sand lizard (Lacerta agilis) reaches the northern periphery of its distribution in south-central Sweden, where small, isolated relict populations occur in pine heath forests on sandy sediments. Modern forestry and fire suppression have reduced the amount of suitable open habitat for the species in this area and seem to be important for its decline. LÄS MER
13. Population dynamics of tundra-living grey-sided voles
Sammanfattning : This thesis deals with the dynamics of tundra living voles with emphasis on the most common one, the grey-sided vole (Clethrionomys rufocanus). The tundra area chosen for the study was Finnmarksvidda, a vast flatland in northernmost Norway. LÄS MER
14. Live Longer, Work Longer? Evidence from Sweden’s Ageing Population
Sammanfattning : Sweden’s elderly population is growing, propelled by a continuous decline in old-age mortality, while coupled with a persistent replacement level fertility. This changing age structure increases the per worker cost of providing a given age-vector of per capita benefits, encompassing costs for pensions, health care, and all other type of old-age welfare services, which presents a looming challenge for the welfare state to sustain its social transfer system. LÄS MER
15. Life histories and population dynamics
Sammanfattning : During the last decades there has been a growing interest and attention to random variation in population densities and their causes. It has been shown that even in constant environments (deterministic population growth) the dynamics of populations can display random like behaviour depending on parameter values. LÄS MER