Search results for "growth"
showing 10 items of 5134 documents
Environmental noise and population dynamics of the ciliated protozoa Tetrahymena thermophila in aquatic microcosms
2003
Population theory predicts that the reddened environmental noise, especially in combination with high population growth rate, reddens population dynamics, increases population variability and strengthens environment–population correlation. We tested these predictions with axenic populations of ciliated protozoa Tetrahymena thermophila. Populations with low and high growth rate were cultured in a stable environment, and in environments with sublethal temperature fluctuations that had blue, white and red spectra (i.e. negatively autocorrelated, uncorrelated, or positively autocorrelated, respectively). Population size and biomass of individuals were determined at 3-h intervals for 18 days. Dy…
Delayed mixis in rotifers: an adaptive response to the effects of density-dependent sex on population growth
2004
In most cyclically parthenogenetic life cycles, sex is needed to produce resting stages. In several species of cyclically parthenogenetic rotifers, some generations of clones are not responsive to a density-dependent signal that triggers sexual female production. These unresponsive rotifers hatch from resting eggs and typically pass 8–12 generations of female parthenogenesis before becoming receptive to the mixis signal. We addressed the selection for mixis delay using a simulation model. A delay of sexual reproduction could increase population growth through parthenogenesis and thus the number of resting eggs ultimately produced. In a monomorphic population without mixis delay, we determin…
Migration Flows in Finland: Regional Differences in Migration Determinants and Migrant Types
2003
The present study analyzes interregional migration flows in Finland during 1985-96 using a large sample from the longitudinal census data file. The regional concentration of population has sped up in recent years, and most migrants now head to five urban growth centers. The empirical analysis reveals that it is particularly the human capital component (young, educated individuals) that moves to, and stays in, the growth centers. They are attracted by the higher expected wages and employment chances. Conversely, some individuals, mainly older and less educated ones, move back to their original home regions. This countermovement reduces the speed of population concentration. Declining region…
Regional Policy Lessons from Finland
2005
The Finnish economy and society has long been dominated by primary production. Post-war economic development was rapid and welfare gaps between the much more developed economies and Finland narrowed and were even partly reversed. Rapid economic expansion together with structural change has had the effect of centralizing both economic activity and population. The trend has been towards the southern and central regions where the metropolitan area of Helsinki and most of the other larger towns and urban centres are located. Together with vigorous technological progress in agriculture and forestry the rapid urbanization and industrialization of the 1960s and 1970s the fastest in Europe altered …
Conflict and the Evolution of Societies
2012
The Malthusian theory of evolution disregards a pervasive fact about human societies: they expand through conflict. When this is taken account of the long-run favors not a large population at the level of subsistence, nor yet institutions that maximize welfare or per capita output, but rather institutions that maximize free resources. These free resources are the output available to society after deducting the payments necessary for subsistence and for the incentives needed to induce production, and the other claims to production such as transfer payments and resources absorbed by elites. We develop the evolutionary underpinnings of this model, and examine the implications of free resource …
The measurement of economic, social and environmental performance of countries: a novel approach
2010
This paper presents a new analytical framework for assessing spatial disparities among countries. It takes for granted that the analysis of a country's performance cannot be limited solely to either economic or social factors. The aim of the paper is to combine relevant economic and 'non-economic' (mainly social) aspects of a country's performance in an integrated logical framework. Based on this idea, a structural simultaneous equation model will be presented and estimated in order to explore the direction of the causal relationship between economic and non-economic aspects of a country's performance. Furthermore, an exploration of the trajectory that each country has registered over time …
INCOME AND QUALITY OF LIFE INFLUENCE ON CITIZENS' PARTICIPATION IN ACTIVITIES OF LOCAL GOVERNMENTS IN LATVIA
2018
The aim of the paper is to analyse the factors influencing the citizen participation in activities of local governments in relation to quality of life in Latvia. The use of the CLEAR model, elaborated by a group of British researchers under guidance of Gerry Stoker, shows the possibilities of participation and engagement of citizens based on theoretical aspects. Latvia, as a member state of the EU, needs to develop and to involve more citizens in different social activities, since it has comparatively small experience in democratic processes due to its past of 50 years being a part of another country — the Soviet Union. The opportunities to participate in the European Parliament’s election …
Family networks and refugees’ health conditions. A picture from Italian informal settlements
2021
While the relationships between social networks and health are widely acknowledged in the literature, few of these studies have covered the population of refugees living in makeshift camps. In our analysis of a nationally representative Italian survey of individuals living in informal settlements, we find that many had weak family relations: only 10 per cent had one or more family members in their settlement. The paper analyses the effects of individual social network on two measures of health, and finds that the refugees’ health conditions were associated with both their personal characteristics and the characteristics of the settlement. The results show that more than 50 per cent of these…
URBANIZATION PROCESSES AND ITS SPECIFICS IN LATGALE
2010
<p>Urbanization is an important demo-geographical process and a complex social phenomenon under impact of which changes are made not only to the global, regional or national settlement systems, but all socio-economic processes are also substantially transformed. Changes caused by urbanization have an impact on traditional way of life, cultural particularity, community and individual psychology and other aspects of spiritual life, therefore expressions and regularities of this process might be of interest not only for demographers, geographers and economists, but also for representatives of the field of humanities.</p><p>Paper presents the progress of urbanization processes…
International Retirement Migration: Transforming Societies Through Purchasing Power?
2016
Despite a more than 40-year-old tradition of international retirement migration (IRM) in Europe, relatively little social scientific research has been carried out in this field. Retired European migrants have not been considered to be politically controversial (i.e. they are not viewed as having been the causes of social problems or as needy, poor or deprived). Often, the terms used in the 1980s and early 1990s to describe these populations have been linked not to a migration model but to the model of the social agent of a tourist. The chapter is divided into three parts: (1) a general overview of the flows and socio-economic characteristics of IRM in Europe, addressing the main regions of …