EcologyCommunities - predation where prey is not...

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3/10/11 1 Chapter 35 Communities in Ecology Ecological Dominants Species that are abundant in a given community (Usually plants) Keystone Species May not be numerous, but have an irreplaceable role in the community Removing them leads to drastic change Biodiversity: Variety in living things Definitions Habitat: Physical surroundings of a species (forest, pond, soil, etc.) Niche: Description of an organism’s way of making a living: includes habitat, food, and behavior Competition By definition, no two species can occupy the same niche for long One will always outcompete the other
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3/10/11 2 Predation One organism feeds on another organism Not just animals eating each other, includes plants Rabbit = predator/Grass=prey Parasitism Variation of
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Unformatted text preview: predation where prey is not immediately (or ever) killed There are parasitic plants as well as animals Defenses of Prey (partial list) Run away Hide (Camouflage) Be painful to eat (quills, thorns) Taste awful Warning Coloration/Mimicry Prey that taste bad or are poisonous typically have bright colors Predators learn to stay away Other species can mimic 3/10/11 3 A moth mimics wasp colors Mutualism Two species both benefit from an interaction In this example, the shrimp is blind but good at digging a hole Commensalism One species benefits, other is unaffected Example: birds nesting in trees Coevolution Two or more species evolve interdependently Example: pollinators and flowers...
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EcologyCommunities - predation where prey is not...

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