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Ecological Relationships and Species Interactions

Ecological Relationships and Species Interactions. Developed by Steven Taylor Wichmanowski based on Pearson Environmental Science by Jay Withgott. Competition and Niches : Get in Where you Fit in.

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Ecological Relationships and Species Interactions

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  1. Ecological Relationships and Species Interactions Developed by Steven Taylor Wichmanowski based on Pearson Environmental Science by Jay Withgott

  2. Competition and Niches: Get in Where you Fit in Remember that a Niche includes an organism’s habitat, resource use, and functional role in an ecological community.

  3. When two or more organisms are seeking the same resources (living space, food, sunlight, mates, water, etc.) they are in competition for these resources. Intraspecific competition is competition among members of the same species  Interspecficcomptetionis competition among different species

  4. When two or more species are in competition for the same niche, two outcomes are possible: Competitive exclusion:one species is so successful that the other species are pushed out of the niche completely (this can result in extinction of the less successful species, or simply disappearing from a specific community)  Resource partitioning:two or more species divide the resources of a niche (this can lead to specialized evolutionary adaptations)

  5. Resource Partioning

  6. Because of competition, niches can be further divided into a species’ fundamental niche and their realized niche.  Fundamental niche: the full potential niche of a species  Realized niche: the actual niche of a species restricted by competition

  7. Feeding Relationships Predation: a feeding relationship where one animal hunts, kills and consumes another animal. The hunter/eater is called the PREDATOR The hunted/eaten animal is called the PREY

  8. Generally speaking, predators have forward facing eyes and prey have side facing eyes. Why?

  9. What other kinds of adaptations do predators and prey have?

  10. Apex Predator: The dominant predator at the top of a food chain

  11. Herbivory: a feeding relationship where an animal eats a plant.  Unlike predation, herbivory does not usually result in the death of the organism that is consumed.

  12. Symbiotic Relationships A symbiotic relationship is a long-term, physically close relationship between separate species where at least one organism benefits.

  13. Mutualism: (+/+) a symbiotic relationship where both species benefit

  14. Commensalism: (+/0) a symbiotic relationship where one species benefits and the other is not affected either positively or negatively

  15. Parasitism: (+/-) a symbiotic relationship where one species benefits and the other is harmed

  16. Are these symbiotic relationships? What kind?

  17. Coevolution Coevolution: occurs when species in an ecological relationship evolve in response to changes in each other. Coevolution can result from feeding relationships and/or symbiotic relationships

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