LIFESCI 7B Lecture Notes - Lecture 18: Ecological Pyramid, Trophic Cascade, Ecological Niche
Document Summary
Clicker the relationship between the tree and the mistletoe is parasitic. How would you characterize the relationship between the mistletoe and bird. Mutualism (+/+) association between two species that has a mutual bene t. How close are things range of mutualisms not dependent. Mutualism: animals and fungi leaf cutter ants are fungus farmers. Mutualism (+/+) plants and mycorrhizal fungi (~450 mya) Plants dont necessarily need mycorrhizal but it greatly enhances. Interspeci c competition lab experiments: competition does not change k but prevents pop sizes from reaching k can be growth together or alone alters growth rate. Fundamental vs realized niche ecological niche: role of the species in the ecosystem fundamental niche: niche a species could occupy without competitors realized niche: niche a species actually occupies. How does competition for resources play out in the long term. % energy available changes as you move up trophic levels. 10% rule -- rule of thumb only 10% of energy is transferred.
