Lecture_12_Population_Ecology

Lecture_12_Population_Ecology - 6/15/2011 What is Ecology?...

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6/15/2011 1 Population Ecology LS1: Summer Session A July 20, 2011 What is Ecology? The scientific study of interactions between organisms and their environment Includes abiotic and biotic factors Ecology The scientific study of interactions between organisms and their environment Includes abiotic and biotic factors Reindeer Shrubs Sunlight Wind Humidity Microorganisms Parasites Temperature Geology The value of ecology Ecology studies how organisms interact with their environment We can examine the impact that a changing environment has on the living world Lake Erie Although one of the smallest of the Great Lakes, Lake Erie still ranks as the 10 th largest lake in the world Collectively, the Great Lakes provide drinking water for 40 million people A major source of freshwater used for agriculture Pollution in Lake Erie Industrialization in the surrounding areas led to dramatic pollution of Lake Erie The Cuyahoga River, a major tributary of Lake Erie actually caught on fire (!) in 1969
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6/15/2011 2 Environmental effects Eutrophication and hypoxia from phosphorous-rich runoff Estrogen-mimicking hormones have resulted in hermaphroditism and lower egg production in seabirds Other ecological problems in Lake Erie Increased trade throughout the Great Lakes has resulted in the introduction of several exotic species Exotic species tend to outcompete native species because they have no predators or controls The Zebra Mussel Ecological studies Without the field of ecology, these issues would have no scientific explanation Ecology employs the scientific method to study the relationships of organisms to each other and to the environment Ecology is studied at different levels Organismal Ecology Population Ecology Community Ecology Ecosystem Ecology Global Ecology Population Ecology Populations are groups of organisms of the same species living in the same area at the same time Population dynamics involves the patterns and processes of changes in populations Population density is the number of individuals per unit area Demography is the number of individuals of each age and sex class in the population
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Lecture_12_Population_Ecology - 6/15/2011 What is Ecology?...

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