نتایج جستجو برای: population growth rating
تعداد نتایج: 1499997 فیلتر نتایج به سال:
Yemen is among the poorest countries in the world, with a GDP per capita of US$460. It faces structural and policy constraints to achieve sustainable employment-generating growth and delivering the necessary public services to achieve the Millennium Development Goals (MDG) targets. The country is compounded by high population growth (about 3% per year) and the resulting young age distribution (...
The population size in almost all of the countries in the South and Central Asian region shows a significant increase in the last few decades. Nevertheless, during 19801990 and 1990-2000 decades, countries in South Asia experienced a significant decline in the average annual rate of population growth (Table 1). Afghanistan is the only exception showing an increase in the growth rate and its pop...
This paper examines whether the Solow growth model is consistent with the international variation in the standard of living. It shows that an augmented Solow model that includes accumulation of human as well as physical capital provides an excellent description of the cross-country data. The paper also examines the implications of the Solow model for convergence in standards of living, that is,...
This paper builds a two-country, two-sector (manufacturing and agriculture), non-scale growth model and investigates the relationship between trade patterns and the growth rate of per capita real consumption. If the population growth rate of the home country is higher than that of the foreign country, the following results are obtained. (1) Under autarky, the growth rate of per capita real cons...
Global circulation models predict and numerous observations confirm that anthropogenic climate change has altered high-frequency climate variability. However, it is not yet well understood how changing patterns of environmental variation will affect wildlife population dynamics and other ecological processes. Theory predicts that a population's long-run growth rate is diminished and the chance ...
A major question in ecology is how age-specific variation in demographic parameters influences population dynamics. Based on long-term studies of growing populations of birds and mammals, we analyze population dynamics by using fluctuations in the total reproductive value of the population. This enables us to account for random fluctuations in age distribution. The influence of demographic and ...
The relationships between population growth rate and the life-cycle traits contributing to it are nonlinear and variable. This has made it difficult for ecologists to consistently predict changes in population dynamics from observations on changes in life-cycle traits. We show that traits having a high sensitivity to chemical toxicants tend to have a low elasticity, meaning that changes in them...
Because data for conservation planning are always limited, surrogates are often substituted for intractable measurements such as species richness or population viability. We examined the ability of habitat quality to act as a surrogate for population performance for both Red-shouldered Hawks (Buteo lineatus) and Northern Goshawks (Accipiter gentilis). We compared simple measures of habitat qual...
Although it has been suggested that induced and constitutive plant resistance should have different effects on insect herbivore population dynamics, there is little experimental evidence that plant resistance can influence herbivore populations longer than one season. We used a density-manipulation experiment and model fitting to examine the effects of constitutive and induced resistance on her...
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