BIO-8 Lecture Notes - Lecture 17: Population Ecology, Metabolic Waste, Succulent Plant
Document Summary
Metabolic wastes hypothesis: metabolic waste stored, later coopted for defense (happened to provide anti-herbivore function: 2. 1. 9 million described species exist on earth: at most, a few percent of these are parasites. Most parasites are host specific: most parasites have a limited host range. Study of population ecology of parasites and their hosts: model for directly transmitted microparasites. Number of new infections per infected host. Rp<1 parasite decreasing and eventually go extinct. F= fraction of infected hosts that become infectious. L= average length of time an infected host remains infectious. Some pathogens immunity from host response or immunization isn"t complete (either stars out complete and becomes partial or starts at partial) Nt : host population size needed just to maintain the parasite. Rp drops below 1 if n drops below nt value. Small populations may not be able to maintain this value. B: transmission rate of hiv is low due to engaging in specific behaviors.
