BIOL 215 Lecture Notes - Lecture 17: Metapopulation, Serengeti, Intraspecific Competition
11 Mar 2013
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Document Summary
Based on the rosenzwieg-mcarthur model, as you have more and more prey, there is stronger and stronger intraspecific competition, so to stabilize the population of prey, you need less predators which is why the curve goes down. Mutualism interaction is when coexistence is beneficial to both species. For the grouper and small fish example, we are not saying that the relationship is an obligatory mutualism; both the small fish and grouper can live apart and do fine. However, they will do better when they are living together: mycorrhizae as a mutualistic interaction. Mycorrhizae fungi provide plants with greater access to inorganic nutrients and are important to plant performance. Herbivory interaction: herbivore consumes its prey but does not always kill it. Predation interaction: predator kills and consumes its prey. There is a high metabolic cost to defend oneself. Thus, the plant"s fitness level overall will decrease.
