Community Interactions

BioH – Chapter 40

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Basic Ecology Terminology

• Habitat

• Community

• Niche

• Community

Interactions2

The physical, chemical and biotic features of where an organism is typically found

All species within a habitat that interact with each other – influenced by: Abiotic conditions Resource availability Adaptive traits of organisms Species to species interaction Population size

The sum of all activities & relationships an organism engages in as it interact in the community.(The “role” that an organism plays)

Relationships between communities within habitat Symbiotic - “living together” Harmful relationships

Community Interactions

Complete the Community Interactions Video Questionnaire! 3

Community InteractionsDescription Organism A Organism B Example

Predation +

Mutualism +

Commensalism +

Parasitism +

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Most relationships are NEUTRAL (no effect on either species)

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Community Interaction Mechanisms

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Defense Mechanisms• Camouflage• Warning coloration• Mimicry• Moment-of-truth defenses

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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