Population Growth Homework: Calculating Population Size and Death Rates, Study notes of Biology

Download Population Growth Homework: Calculating Population Size and Death Rates and more Study notes Biology in PDF only on Docsity! Homework 1 - Population Growth 1) a) r/n = c/N 6/54 = 100/N 1/9 = 100/N N/9 = 100 N = 900 b) If animals are less likely to get captured than to be captured the 1st time, then the number of recaptures is less than our method of analysis assumes. If we make our estimate of true N based on this, we will estimate it assuming that we have relatively few captures simply because our true population is so large that the fraction we managed to mark was simply very small—but, in fact, a large true N can’t fully account for the small number of recaptures if this number of recaptures is made even smaller by behavioral avoidance of recapture…so, if we assumed all animals were as likely to be recaptured as to be captured the captured the first time, and in fact being recaptured was less likely, we would overestimate N. In our example above, this would mean that N was actually less than 900. 2) a) N = 10,000; b = 0.4; since "population is constant year after year", then r must equal 0. r = b - d rearrange to: d = b - r so d = 0.4 - 0 d = 0.4 Since the question asks for "total number of deaths", we need to find D D/N = d so D = dN = 0.4*10,000 = 4000 b) r = b - d so d = b - r d = 0.4 – 0.25 = 0.15 3) a) Survivorship Average # offspring produced per female born 1.0 0 0.25 0.25 X 1 = 0.25 0.2 0.2 X 5 = 1 0.1 0.1 X 6 = 0.6 0.05 0.05 X 0 = 0 b) 0 + 0.25 + 1 + 0.6 + 0 = 1.85