attachment-5.ashx - Handout for CHAPTER 26 Population...

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Handout for CHAPTER 26– Population Growth and Regulation What is ecology? Branch of bilogody that deals with relationships of living things with their environment. “environment” includes 2 components: Biotic (living)- other organisms Abiotic- (not living) features such as weather, soil, water, nutrients, temperature, etc. From Greek word “oikos”= house/home the study of an “organisms home” exologists like to define their science as: the study of the distribution and abundance or organisms -where they are or are not found -how many / how few (and how #s change) -reasons for these patterns Ecology vs Environmentalism Ecology is not environmentalism Ecology- scientific branch of biology Environmentalism- human based concern Ecology provides us with information about the health of our environment. How we feel about the act on that info is part of environmentalism. The scientific study of the influence of human activities on natural processes= environmental science. -(Includes ecology, law, economics, politics, Sociology, etc.) 1
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Levels of organization in ecology (from small to big) 1 – individual How does an individual organism live in its “house”, its habitat. Physiological ecology- study of criters at the individual level. How it obtains water, food, how it deals with weather, etc. 2 – population All the individuals of a species living in the same area population ecology- studies of the population how people sizes change (up, down, stable) and why birth, death, movements among population 3 – community All the interacting populations within a given area Communitry ecology studies this How organisms in the area affect eachother. Predators, prey, parasite, competition, etc. 4 – ecosystem All the communities and the abiotic factors in a given area.
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