Interspecific Interactions

5/25/06

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Table of Contents

Interspecific Interactions

Types of Interspecific Interactions

“Styles” of Competition

Some specific types of competition

Example of Interference Competition

Outcomes of Competition

The Competitive Exclusion Principle

Evidence for Competitive Exclusion.

Other experiments...

Resource Partitioning

Example of Resource Partitioning

Character Displacement

Example of Character Displacement

Competition and the Niche

Two organisms cannot occupy exactly the same niche.

Example: Allelopathy in the California Chaparral

Examples of Mutualism

Mutualistic Symbiosis

Facultative vs. Obligate Mutualisms

Other Examples of Mutualisms

Short Discussion

Predation, Parasitism, Herbivory

Predator-Prey and Parasite-Host Coevolution

Example of Parasite-Host Coevolution

Predator-Prey Population Dynamics

Example of Regulation of Host Population by a Herbivore

The time-lag effect may lead to predator-prey oscillations.

Cycles in the population dynamics of the snowshoe hare and its predator the Canadian lynx (redrawn from MacLulich 1937). Note that percent mortality is an elusive measure, it may, or may not, be useful since mortality varies with environment and time.

Author: Alan Molumby