BIO105 Apr2

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Department
Biology
Course
BIOLOGY 105
Professor
Jeff Podos
Semester
Spring

Description
4/2/14 Yellowstone Park –Aspen Tree • Loss of wolves may explain why less Aspen trees in the area • Wolves feed on elk (keeps their numbers in check) • Elk feed on aspen saplings and seeds • No wolves = lots more elk • Lots more elk = less aspen trees • Wolf had indirect effect on the aspen tree o Tropic cascade • To try to fix this problem, scientists brought back in wolves o When the wolves came back, elk numbers went back down, giving the vegetation a chance to grow again • Tropic cascade = a process that starts at the top of the food chain and tumbles all the way down Species interactions continued • Predator x prey x plant relationships o Ex) wolves / elk / aspen trees o Ex) Jaguar / agouti / etc Peru • Predator = jaguar (carnivore) • Prey = agouti (herbivore) • Jaguar keeps agouti numbers in check • Agouti do damage to the large tropical trees • Large seeded trees limit
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