A researcher studying a population of antelopes developed the life table shown b

Question

A researcher studying a population of antelopes developed the life table shown below. Ix 0 1.00 0.20 0.16 0.13 0.10 0.08 0.0 3 2 2 0 4 6 a) Contrast two methods that the researcher might have used to generate these data. (4 pts) b) Use the life table to infer whether this species follows a type I. I,or ll survivorship curve. (4 pts) c) Calculate the net reproductive rate and conclude whether the population is at risk of extinction.(4 pts) To ensure accurate grading, label your answer for each part (a-c) and separate them by a blank line. 3(12pt) , ·T··@ TTT Paragraph, Arial HTHL ESS

Explanation / Answer

a) There are two types of life tables: "generation" or "cohort" life tables and "current" life tables.
Using "generation" life tables, mortality patterns of a certain birth cohort can be followed until all individuals of that cohort die out.

In the current life tables - it reflects projected conditions of the mortality of a hypothetical generation for a given year assuming that the generation has the same rate of mortality that was in the prevalent year.

b) As we can see , the survivor ship (lx) is decreasing with the increasing age , and the difference is not the same . That means it will have concave curve in the survivorship plot.

Therefore it is type III survivorship curve .

c) Net reproductive rate in a life table is simply the mean of the daughter produced by a female in her lifetime .

That means we will have to take the mean of bx

Therefore NRR= 0+0 +1+1+2+2+0/7 = 6/7 = 0.8

The net reproductive rate is less than 1 , that means the size of the population is decreasing . But it's very close to 1 , therefore we can't say it's at the verge of extinction .

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