Lec5EEMBW08

Lec5EEMBW08 - 1 Single species in nature do not exist alone...

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Unformatted text preview: 1 Single species in nature do not exist alone but in a matrix with other species- Some species are unaffected by the presence absence of other species- Many species often interact- Interactions may have positive or negative outcomes Species Interactions Types of Interactions 1) Mutualism (+,+) 2) Commensalism (+,0) 3) Competition (-,-) 4) Predation (+,-) Species Interactions Positive Interactions: 1) Mutualism (+,+) - Both species benefit from the association Examples: large African mammals and tick birds sea anemone and zooxanthellae Species Interactions Positive interactions: 1) Mutualism (+,+) 2) Commensalism (+,0) - One species benefits from the association, the other is unaffected Example: remora and shark cockroach and human Species Interactions Positive interactions: 1) Mutualism (+,+) 2) Commensalism (+,0) Negative interactions: 3) Competition (-,-) - Both species are harmed from the association Example: Lion and Hyena 2 Species Interactions 4) Predation (+,-) - One species benefits & the other is harmed in the association Positive interactions : 1) Mutualism (+,+) 2) Commensalism (+,0) Measure (+) benefit at the population level by an increase in growth rate in comparison to populations lacking such interactions Example: Any predator and prey, Humans and parasites (parasitism) Negative interactions: 3) Competition (-,-) Examples: Humans and parasites (parasitism)- Tapeworms- Intestinal roundworms- bot flies, etc. Species Interactions 4) Predation (+,-) - One species benefits and the other is harmed in the association Negative interactions: 3) Competition (-,-) Example: Humans and parasites (parasitism)...
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This note was uploaded on 04/07/2008 for the course EEMB 2 taught by Professor Evan during the Winter '07 term at UCSB.

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Lec5EEMBW08 - 1 Single species in nature do not exist alone...

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