Section 3 - Lakeside High School
Section 3.1; Community Ecology
1. All living organisms are limited by factors in the environment.
2. Organisms have a range of tolerance for each limiting factor they encounter.
3. Primary succession occurs in areas of “new possibilities”. Secondary
succession occurs in disturbed sites.
4. Communities undergo succession until they reach a stage called a climax
community.
Questions 3.1
1. Give an example of where one might observe primary succession.
2. What organisms might one observe during the pioneer stages, intermediate,
and mature community stages of primary succession.
3. Where might one observe secondary succession?
Section 3.2; Terrestrial Biomes
1. Ecosystems on land are grouped into biomes primarily based on the plant
communities within them.
2. The two primary abiotic factors that determine the nature of a biome are
precipitation, and temperature.
Questions 3.2
1. The following terms are grouped in increasing “size” or inclusiveness order.
Fill in the missing blanks with the correct term.
Species, _______________, Community, _______________, Biome, and
_____________________.
2. What is the difference between weather and climate?
3. List the world’s major terrestrial biomes. (There are eleven listed).
Section 3.3; Aquatic Ecosystems
1. Aquatic ecosystems may be divided broadly into fresh, and saltwater.
2. Freshwater biomes include ponds, streams, lakes, rivers, and wetlands.
3. Marshes and estuaries are transitional aquatic ecosystems.
Questions 3.3
1. What percentage of water on our planet is considered freshwater?
2. In what three forms is most freshwater on earth found?
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