Community Relationships & Symbiosis
Biology – Chapter 4
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Community Interactions
Complete the Community Interactions Video Questionnaire! 2
Community Interactions
Description Organism A Organism B Example
Predation +
Mutualism +
Commensalism +
Parasitism +
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Ecological Succession
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Primary succession = succession where no soil existsPioneer species = the first living organisms to populate an areaSecondary succession = succession to existing ecosystem after natural disaster
Mt. St. Helens
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Before eruption – May 17, 1980 After eruption –
May 18, 1980
Today
Other succession examples
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Tuolumne Meadows - Yosemite
Climax Communities
Land BiomesComplete the Climax Communities Video Worksheet 15
Climate Diagrams
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World-wide land biome climate maps
Other Biomes
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Mountain rangesPolar ice caps
Aquatic Biomes Freshwater Ecosystems
Flowing water Standing water Freshwater wetland Estuary
Marine ecosystems Photic Aphotic Intertidal Coastal Open ocean
(Greenland)
Primary Productivity
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A measure of energy produced per area
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