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25 Cards in this Set
- Front
- Back
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What is a community?
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Is the variety of different kinds of organisms that make up the community.
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How can diversity of community be determined? {richness vs abundance}
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1. Species *richness, the total number of different species in the community.
2. Relative *abundance of the different species. |
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*interaction between species:
(Competition)? |
two species so similar that they compete for the same limiting resources cannot coexist in the same palce.
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What would happen between identical niches?
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1. Extinction of one species
2. Evolution of one species to use a different set of resources. |
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*interaction between species:
Predation? |
Is when organisms eat other organisms.
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Defense against predation.
*Plant defenses? |
They can either secrete a chemical toxins or have physical defenses like thorns.
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Defense against predation.
* Animal defense:1. distraction |
displays direct the attention of the predator away from a vulnerable prey to another prey that is more likely to escape.
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Defense against predation.
*Animal defense:2. camouflage |
cryptic coloration, is passive defense that makes a potential prey difficult to spot against its background.
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Defense against predation.
*Animal defense:3. warning coloration |
animals with chemical defenses {taste bead or are harmful to eat} are often brightly colored.
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Defense against predation.
*Animal defense:4. Batesian mimicry |
harmless or "tasty" species mimics a harmful mode.
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Defense against predation:
*Animal defense:5. Mullerian mimicry |
two or more unpalatabel species resemble each other.
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Why predator-prey relationships important?
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Can actually preserve species diversity.
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Mutualism
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Is a symbiosis that benefits both partners.
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Parasitism
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Is a symbiotic relationship in which one organism benefits while the other is harmed.
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What is an ecosystem?
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is a biological community and the *abiotic factors with which the community interacts.
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what is food web?
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the feeding relationships in an ecosystem.
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Producers
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are plants
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Primary consumers
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are Herbivore
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Secondary consumers
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include many small mammals, such as rodents, and small fishes that eat zooplankton
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Tertiary consumers
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such as snakes, eat mice and other secondary consumers
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Quaternary consumers
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include hawks and killer whales
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Three Main causes of the Biodiversity Crisis:
*1. Habitat Destruction: |
Poses the single greatest threat to biodiversity throughout the biosphere. For example:chopping down trees.
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Three main causes of the Biodiversity Crisis:
*2. Introduced species: |
Human introduction of exotic species. Rnaks sexond behind habitat loss. can cause rapid exticitons.
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Three main causes of the Biodiversity Crisis:
*3. Overexploitation: |
overexploitation of wildlife.
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greenhouse effect
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Retains solar heat in the atmosphere. Is produced by carbon dioxide and water vapor in the atmosphere.
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