population pressure
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Reaction norms depict the range of phenotypes a single genotype can produce, depending on the environment. Reaction norms must fit within an organism's phylogenetic constraints. They can differ for different individuals within a population, but some traits differ very little based on the environment; some do not differ at all.
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Families lived together in traditional China and sons remained on the land; division of family land led to tiny plots and rural poverty. Because labor was so cheap, the country did not urbanize or mechanize. The Communist government started out with a pro-natal stance, but after experiencing the famine of the Great Leap Forward, moved strongly to fertility control. Fertility declined rapidly in the 1970s, but to counter momentum, the One-C...more
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Mutations are the origin of genetic diversity. Mutations introduce new traits, while selection eliminates most of the reproductively unsuccessful traits. Sexual recombination of alleles can also account for much of the genetic diversity in sexual species. In some instances, population size can affect diversity and rates of evolution and fixation, but in other cases population size does not matter.
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China's early demographic history is similar to that of Europe; population grows only slowly due to war, disease and Malthusian resource limitation. Later, introduction of American foods allowed cultivated land to expand, but population expanded even more rapidly, leading to an extremely dense, but poor population. During this time, female infanticide was frequent, but almost all surviving girls got married. Within marriage, their fertilit...more
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Early Modern England: Politics, Religion, and Society under the Tudors and Stuarts (HIST 251)Professor Wrightson begins by assessing the state of education in the late medieval period and then discusses the two cultural forces (Renaissance humanism and the Reformation) which lay behind the educational expansion of the sixteenth and seventeenth centuries. While there were distinct hierarchies of learning in the period (with women and the lo...more
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Early Modern England: Politics, Religion, and Society under the Tudors and Stuarts (HIST 251)Professor Wrightson discusses the remarkable growth of the British economy in the late seventeenth and early eighteenth centuries. He examines the changed context of stable population and prices; regional agricultural specialization; urbanization; the expansion of overseas trade both with traditional European trading partners and with the Americas ...more
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Early Modern England: Politics, Religion, and Society under the Tudors and Stuarts (HIST 251)Professor Wrightson discusses the Elizabethan settlement of religion and the manner in which it was defended from both 'Papist' and 'Puritan' opponents. The settlement of religion achieved in 1559 (and enforced through the Act of Uniformity) restored the royal supremacy, but was in some respects deliberately ambiguous, combining moderately Protesta...more
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Environmental Politics and Law (EVST 255) The final lecture reviews topics discussed in previous lectures by imagining an ideal society. Professor Wargo talks about success stories in land management in the Adirondacks and pesticide regulation, and notes ongoing challenges in food safety, drinking water quality, personal consumption, population control, and the creation of parks and protected areas. He lectures about the fractured nat...more
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Environmental Politics and Law (EVST 255) To illustrate the linkages among national security, secrecy, and environmental quality, Professor Wargo describes the Atomic Energy Commission's nuclear tests in the 1950s. The Atomic Energy Commission collected data on the spread of radionuclides from the nuclear tests, and discovered that the radionuclides were circulating around the world. This process of discovery raised issues regarding way...more
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If there was any single belief that characterized the Victorian era it was Christian belief. Religion pervaded social and political life to an extent almost unimaginable today. Yet this was also an age of major scientific progress and discovery. Ranging from Darwin's Origin of Species to Strauss's Life of Jesus, new techniques and approaches undermined faith in the literal truth of the Bible. This lecture looks at the relationship betwe...more
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The transparent tissues of the eye allow light to reach the retina. This highly metabolic tissue requires oxygen delivered by the blood vessels, which are damaged by disease. Diabetic retinopathy is the commonest cause of blindness in the working-age population and in later life hypertension adds to this toll. The eyes maybe the mirror of the soul, but they certainly are a window into our general health. This lecture traces the story f...more
