Biology 1001A Lecture Notes - Lecture 20: Thermoregulation, Genotype Frequency, Allele
18 Oct 2012
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Transmission mode hypothesis: optimal virulence depends on how the parasite moves between host individuals. Reduce chances for indirect transmission parasites rely more on direct transmission promotes evolution of reduced virulence: ex. Population: group of individuals of the same species, living in a defined geographic area. Characteristics: populations have attributes that are not associated with individuals: How to estimate population size: mark-recapture method (first visit) capture & mark an initial sample (m) (second visit) capture a second sample of animals (c) and see how many are marked recaptures (r) Use this to estimate population sixe (n) Marked and unmarked animals equally likely to be captured. Time between 2 samples is long enough for marked animals to mix freely with unmarked animals, but no so ling that population size changes. Density = n/area: or density = n/volume, density is higher for animals with smaller body size, density is lower for animals with larger body size. Influences access to resources: density too high:
