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19.1 Ecology. The study of interactions between organisms and the living and nonliving components of their environment. Oikos = house Logy = study of. Exploding Human Population. The worlds population since 1930 has tripled from 2 billion to 6 billion in 1999.
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19.1 Ecology The study of interactions between organisms and the living and nonliving components of their environment. Oikos = house Logy = study of
Exploding Human Population • The worlds population since 1930 has tripled from 2 billion to 6 billion in 1999. • Projections estimate by 2050 a population of 7.8 and 12 billion.
The Sixth Mass Extinction • Due to this exploding human population scientists estimate that 1/5 of the species that exist today may disappear in the next century. • Scientist have found evidence of five previous mass extinctions. Ex. Ice ages, dinosaurs dying out.
Thinning ozone • The ozone layer protects organisms from ultraviolet (UV) light. • Due to the production of CFC’s (ChloroFloroCarbons) there is now a hole in the ozone over Antarctica
Climate Changes • The Greenhouse effect is when gasses trap solar radiation in the atmosphere of the earth. • If this effect is too strong it can become too hot • If the effect is too weak it can become too cold.
Levels of Organization • Biosphere • Ecosystem • Community • Population • Organism
Biosphere • All organisms live in the biosphere (earth)
Ecosystem • The biosphere is made of many ecosystems • Ecosystems include the living and non living things found in a particular place.
Community, Population, and Organism. • All these are living things. • Community is all the organisms living and interacting in an area • Populations include all the organisms of one type of species • Organisms are individuals
Key theme in Ecology • No organism is isolated. There is an interconnectedness of all organisms
Disturbances in Ecosystems • Due to interconnectedness if one species dies out this can affect other organisms.