Community interactions
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Community Interactions. Chapter 5 Section 2: Interactions in Communities Pages 109-111. Introduction.

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Community Interactions

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Community interactions

Community Interactions

Chapter 5

Section 2: Interactions in Communities

Pages 109-111


Introduction

Introduction

Interactions in communities can take many forms. Predators and prey are locked in a struggle for survival. Organisms with the same needs compete for food. Parasites and hosts try to get ahead of one another. Some organisms even depend on one another for survival. (Holt, page 109)


Living relationships

Living Relationships

  • Predation—one organism (predator) captures and feeds on another organism (prey)

    • Predators come is all sizes!


Living relationships1

Living Relationships

  • Herbivory—herbivores that eat plants without killing the plant

    • Plants use various defenses against herbivory

    • What are they?


Living relationships2

Living Relationships

  • Competition—when organisms attempt to use the same resource in the same place at the same time


Symbiosis

Symbiosis

  • Symbiosis—relationships between different species living closely together

    • Sym- “together”, -biosis “living”

  • Three types:

    • Mutualism

    • Commensalism

    • Parasitism


Mutualism

Mutualism

  • Mutualism—both species benefit

  • Examples: bacteria in digestive tract, fish and shrimp that clean bigger fish and turtles


Commensalism

Commensalism

  • Commensalism—one member benefits, the other is not helped nor harmed

    • Examples:Bromeliads live in the tops of the trees in rain forest without harming trees


Community interactions

Spanish Moss is an epiphyte (type of plant that grows on other plants for support, moisture, and sunlight)


Parasitism

Parasitism

  • Parasitism- one organism (parasite) lives off the other organism (host) while harming it but not killing the host!

    • Parasites can live on or in the host

    • Examples:ticks, fleas, mosquitoes, heartworm, leeches


Which are these

Which are these?


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