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?
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?
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter45: Population And Community Ecology
Section: Chapter Questions
Problem 6RQ: Humans have which type of survivorship curve? Type I Type II Type III Type IV
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Question
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?
Transcribed Image Text:Cohort (control 1840's)
R0-Σ Ιxbx
0 0.855792
Age Class #Deaths in class # Surviving from birth Survivorship(Ix) Log(S1000) Fecundity(bx) Ix*bx
0-9
3
100
1
3
10--19
1
97
0.97
2.986
0.1446 0.140262
20-29
4
96
0.96
2.982
0.5553 0.533088
30-39
92
0.92
2.963
0.1851 0.170292
40-49
15
90
0.90
2.954
0.0135
0.01215
50-59
17
75
0.75
2.875
60-69
23
58
0.58
2.763
70-79
23
35
0.35
2.544
80-89
7
12
0.12
2.079
90-99
3
5
0.05
1.693
100-110
1
2
0.02
1.301
Cohort( Post 1880's)
Age Class #Deaths in class # Surviving from birth Survivorship
Log(S1000) Fecundity
Ix*bx
RO-Σ Ixbx
0-9
15
100
1
3
0.718587
10--19
4
85
0.85
2.929
0.1446
0.12291
20-29
7
81
0.81
2.908
0.5553 0.449793
30-39
8.
74
0.74
2.869
0.1851 0.136974
40-49
8.
66
0.66
2.820
0.0135
0.00891
50-59
7
58
0.58
2.763
60-69
16
51
0.51
2.708
70-79
18
35
0.35
2.544
80-89
10
17
0.17
2.230
90-99
6
7
0.07
1.845
100-110
0.01
1
O o O o
O O
Transcribed Image Text:Cohort Survivorship vs. Age class
Chart
1
2
4
6
8
10
12
Age Class
Cohort 1(Survivorship)
Cohort 2 (Survivorship)
Survivorship
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