1. prepare for tomorrow's check-in by looking over this week's notes.
2. complete Assignment 34A's practice questions (see below).
3. obtain data based on your plan so that you can estimate SoF's population in class tomorrow.
Practice Data Analysis
1. Suppose that you capture 10 individuals of a rare species
of brook trout from an impounded watershed. You place a very small radio activated
tag in the body cavity of each individual and then release these fish. You come
back a month later and capture 20 fish and find that four of these are
individuals that you had previously captured and released. What is your best
estimate of the population size, N?
2. Over the period of a month, you trap and tag 8 red foxes, with
uniquely colored tags, in the Watchmacallit Forest in New Jersey. You set up
motion sensitive remote cameras up at various locations in the forest. A month
later, you collect all the cameras and review the images. You record the
results and note that the cameras took pictures of 3 tagged red foxes and 5 red
foxes without tags. What would be the total population of red foxes in the
area?
Remember that you can approximate
the size of the population using the following equation:
N = ( M x C ) N = Estimated size of
total population
R M
= Total # of animals captured and marked on 1st sampling
C
= Total # of animals captured on the 2nd sample
R
= # of animals captured on the 1st sampling that were recaptured on
the 2nd sampling
No comments:
Post a Comment