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Information obtained from: Holt Science and Technology: Life Science. Austin: Holt Rinehart & Winston, 2007. Print.
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Chapter 18 Section 1
Objectives:
Distinguish between biotic and abiotic parts of the environment
Explain how populations and communities are related
Describe how the abiotic parts of the environment affect ecosystems
Studying the Web of Life: The Science of Ecology –
The study of the interactions of organisms with one another and their environment
The Two Parts of an Environment: Biotic: living factors; all the organisms
that live together and interact with one another
Abiotic: non-living factors such as water, soil, light, and temperature
Organization in the Environment: Levels:
Organism
Population
Community
Ecosystem
Biosphere
Populations:
Definition: a group of individuals of the same species that live together in a specific geographical area
Often compete with one another for food, nesting space, and mates
Examples?
Communities:
Definition: all of the populations of species that live and interact in an area
The populations in a community depend on each other for food, shelter, and many other things
Examples ?
http://www.wcskids.net/shhs/clubsorgs/ecology1.gif
Ecosystems:
Definition: made up of a community of organisms and the abiotic environment of the community
How organisms interact as well as how temperature , precipitation, and soil characteristics affect organisms
Ecosystem:
http://www.nrri.umn.edu/worms/forest/images/ecosystem_fig3.gif
The Biosphere:
Definition: the part of the Earth where life exists
From the deepest part of the ocean to high in the air
Apply:
Part 1: List all of the biotic and abiotic factors in
your neighborhood
Part 2: Describe how biotic factors change when
abiotic factors change
Quick Quiz:
A caterpillar, a deer, and a rabbit all want to drink from the same puddle, eat the same plant, and bask in the same spot of sunshine. Are they competing members of a population? Why or why not?
Using a salt marsh example, explain why ecologists state that saving a large animal such as the heron or egret can also save an ecosystem.
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