Population Dynamics

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This document discusses population dynamics and factors that affect population sizes. It covers monitoring wild populations and how succession leads to climax plant communities. Density-independent factors like temperature and rainfall can influence populations. Density-dependent factors such as disease, food supply, predation, and competition also impact population change. Monitoring is important to understand wild population fluctuations over time. Succession describes the process by which pioneer species are replaced by later species until a climax community establishes.

Education Technology

Population Dynamics SQA HIGHER BIOLOGY Unit 3: Control and Regulation

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Pension systems and reforms are critically influenced by demographic developments that are increasingly compared across countries to identify common issues and trends. For demographic projections researchers across the world rely on those produced by the United Nations; for Europe the demographic projections by Eurostat form the basis of the periodic aging report by the EU Commission. While these projections are technically well done the underlying assumptions for the demographic drivers – fertility, mortality and migration – in the central variants are limited and are largely flawed. Worse, they risk offering a wrong picture about the likely future developments and the relevant alternatives. This paper investigates the assumptions of the demographic drivers by UN and Eurostat, compares it with those by national projections in Portugal and Spain, and offers a review of alternative, recent and cutting edge approaches to project demographic drivers that go beyond the use of past demographic developments. They suggest that economic and other socio-economic developments have a main bearing on future trends in fertility, mortality and migration. And they support the assessment that the UN/Eurostat projected re-increase in fertility rates may not take place, that the increase in life expectancy may be much larger, that the future flows of net migrants to EU countries may be much higher and rising. The resulting overall underestimation of population aging has a bearing on the financial sustainability of the pension systems and reform choices, a topic to be explored in the next papers.

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Dynamic biological process influence population density, dispersion and demographics Distinguish between density and dispersion of population. Describe conditions that may result in clumped dispersion, uniform dispersion, and random dispersion of individuals in a population. What is a life table and why is it a useful tool for ecologists interested in population ecology? Distinguish between a life table and a reproductive table. What does a reproductive table tell us? Describe the characteristics of populations that exhibit Type I, Type II, and Type III survivorship curves. Could you draw the expected survivorship curve if you were given characteristics of the population? The exponential model describes population growth in an idealized, unlimited environment and the elastic model describes how a population grows more slowly as it nears its carrying capacity. Compare the exponential model of population growth with the logistic model. What expectations do we have about exponential growth in natural populations? Under what conditions might we expect to see natural populations increase exponentially? What can modeling an organism\'s capacity to grow exponentially tell us about it? Explain how an environment\'s carrying capacity affects the per capita rate of increase of a population. Explain the meaning of each of the following terms in the logistics model of population growth: dN/dt, t_max, K N, and (K - N)/K? Distinguish between r-selected populations and K-selected populations Life history traits are products of natural selection What are life history traits? What defines an organisms life history? Define and distinguish between semelparity and iteroparity. Explain what factors may favor the evolution of each life history strategy. Solution Density of a population means the number of individuals present in one unit area. Dispersion means in what manner they are dispersed or spread out in that area whether randomly distributed, or in groups or evenly dispersed. In clumped dispersion,animals make groups to move and live together. Often when there is shortage and scarcity of resources in summers, animals tend to make groups to share resources.These groups can be safeguards for juveniles and can protect them. Preying skills of few animals can benefit rest of the group in getting the food. In Uniform dispersion all the animals are evenly distributed on the area and mostly independent to prey and fight for their own food. They find mate according to their own choice and compatibility and protect themselves alone. In random dispersion, the population is distributed randomly in the area where there is mix of all three dispersion patterns. There is enough food in the viscinity, animals can roam and search freely their food and also can form group. Life table is a table that has data about death and birth rates of a population under study, that can give ecologists prediction about probable growth or shrink of a population. It gives them the pattern of .

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