BIS 2B Lecture Notes - Lecture 17: Myxoma Virus, Exponential Growth, Periodical Cicadas

• School: UC-Davis
• Department: Biological Sciences
• Course: BIS 2B
• Professor: strauss,gerhart

Document Summary

Can have beneficial interactions which may increase carrying capacity. Species interactions are conditional as it depends on the environment. Both species has a negative effect on the other. Example: human impacts on other species, bacteria/plants use toxins on kill com. One species benefits at the cost of another. Example: cowbird eggs invade other nests, grown instead of native nestlings. Example: hippos and birds eat bugs on hippo"s skin. Example for predation: prickly pear introduced to australia from north america in mid-1930s. Covered 24 mil hectares (1930; after only 50 years) Introduced specific moth that targets pear and population from 12k. Prickly pear to 27 individuals per hectares within 2 years. Prey (victim) rv: prey"s exponential growth p: predation rate after encounter (success) pv : functional response: how many prey are consumed changes with prey encounter changes pvp: deaths due to predation. Predator pv: functional response d: death rate of predator in absence of prey cpvp: predator birth rate.