Class Notes (835,600)
Canada (509,275)
Biology (6,794)
Biology 1001A (1,727)
Lecture 20

Lecture 20: "Population Ecology"

2 Pages
Unlock Document

Biology 1001A
Susanne Kohalmi

Biology Lecture No. 20: Population Ecology (Monday, November 21, 2011) RECALL (Practical Implications of Transmission Mode Hypothesis): -By reducing the chances for indirect transmission of parasitic species in affected human areas, such parasites will have to rely more on direct transmission, and therefore the evolution of less virulent parasites will be promoted. Population Ecology: -A population can be defined as a group of individuals of the same species, living in a defined geographic area. Characteristics Of Populations: -Populations have many attributes that are not associated with individuals which include: allele and genotype frequencies, population size (N), geographic range, sex ratio, age structure, and rate of growth. Estimating Population Size (N): -Population size for non-moving organisms can be easily determined, however for such organisms that freely move, the Mark-recapture method can be applied. The Mark-Recapture Method: -Capture and mark an initial sample (M). -Later, capture a second sample of animals (C) and see how many are marked as recaptured (R). -This method can be simplified by the formula R/C = M/N or when calculating population size, N = MC/R Assumptions Of Mark-Recapture Method: -Marked and unmarked animals are equally likely to be captured. -Marks don’t affect survival. -Marks don’t wear off or become unnoticeable. -Time between two samples is long enough for marked animals to mix freely with unmarked animals, but not too long that the population changes size (old individuals die, new individuals are born). Population Density: -Density for a population can be defined as the population over the area or volume of the
More Less

Related notes for Biology 1001A

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.