CAMP BIO L/M&MOD MSTG (HARDBOUND BUNDLE
CAMP BIO L/M&MOD MSTG (HARDBOUND BUNDLE
11th Edition
ISBN: 9780134810133
Author: Urry
Publisher: PEARSON
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Chapter 53, Problem 10TYU
Summary Introduction

To determine: At which age, the cohort of a female Belding’s ground squirrel produces the most female young ones.

Introduction: Female Belding’s ground squirrel is a species of squirrels that are inhabitants of mountains and are generally found in the mountains of the U.S. region.

Given data: With reference to the Table 53.1, “Life table for Female Belding’s Ground Squirrels”, the average number of female offspring alive and the age of the squirrel are mentioned in the below table.

Age of the squirrel Average number of female offspring alive
0-1 0
1-2 269.64
2-3 237.49
3-4 148.07
4-5 90.65
5-6 39.52
6-7 15.3
7-8 9.65
8-9 7.72
9-10 1.58

Table 53.1

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Speculate upon the calculation shown in the table and Graph; Briefly explain: a)Do the cohort survivorship curves from each decade different from one another? If so, what might have caused the differences? b)Were the population growing while the cohort was extant? c)How would the data have been altered if Woodland Cemetery had stopped excepting interments in 1950 rather than being open to the present day? d) One problem with studying survivorship curves is that a birth cohort must be followed through until the death of the last individual. How would the shape of a 1960's cohort survivorship curve be altered from those of the 1800's?
If models that display population growth ignored age structure how would this limit their value for predicting furture population size? Reference to either lx or mx.
As a hypothetical example, imagine that you were studying a population of Eastern Collared-Lizards (Crotaphytus collaris). The lizards laid 2000 eggs, of which 1000 were eaten by raccoons and skunks. Eight hundred of the surviving juveniles were eaten by foxes and cats. One hundred and eighty of the young adults died during their first hibernation period. What is the indispensable mortality for each stage? If you want to increase the numbers of reproducing adults, which stage should you focus on?

Chapter 53 Solutions

CAMP BIO L/M&MOD MSTG (HARDBOUND BUNDLE

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