These data represent a composite of the demographics from 1974 to 2004, which co
ID: 56252 • Letter: T
Question
These data represent a composite of the demographics from 1974 to 2004, which coincided with a period of urban and suburban expansion leading to region-wide loss and fragmentation of forest habitat. The Wood Thrushes breed in North America and spend winters in Central America.
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Age
Population Size
Fecundity
bx
Survivorship
lx
lxbx
x(lxbx)
eggs
1736
--
--
--
--
1
286
2.4
2
109
3.1
3
74
3.7
4
39
3.4
5
27
3.8
6
15
2.4
7
9
3.1
8
4
1.3
Complete the Table with the following equations.Include 4 digits to the right of the decimal in your results.
Survivorship, lx = Nx/Ne , where Nx is the population size at age X and Ne is the total population of eggs.
Expected Number of Offspring per Individual
lxbx = lx * bx
Expected Number of Offspring per Individual weighted by age X
x(lxbx) = x * lx * bx
Then estimate the following parameters. (Note: means sum)
Net reproductive rate for the population
Ro = lxbx
Ro = ______________
Generation Time
T = ( x(lxbx))/ ( lxbx )
T = ________________
Age
Population Size
Fecundity
bx
Survivorship
lx
lxbx
x(lxbx)
eggs
1736
--
--
--
--
1
286
2.4
2
109
3.1
3
74
3.7
4
39
3.4
5
27
3.8
6
15
2.4
7
9
3.1
8
4
1.3
Explanation / Answer
Age
Population Size
Fecundity
bx
Survivorship
lx
lxbx
x(lxbx)
eggs
1736
--
--
--
--
1
286
2.4
2
109
3.1
3
74
3.7
4
39
3.4
5
27
3.8
6
15
2.4
7
9
3.1
8
4
1.3
Ro = lxbx
= 0.39528 + 0.19437 + 0.15762 + 0.07616 + 0.0589 + 0.02064 + 0.01581 + 0.00299 = 0.92177
Generation Time
T = ( x(lxbx))/ ( lxbx )
x(lxbx) = 0.39528 + 0.38874 + 0.47286 + 0.3464 + 0.2945 + 0.12384 + 0.11067 + 0.02392 = 2.15621
T = 2.15621/0.92177 = 2.3392
Age
Population Size
Fecundity
bx
Survivorship
lx
lxbx
x(lxbx)
eggs
1736
--
--
--
--
1
286
2.4
0.1647 0.39528 0.395282
109
3.1
0.0627 0.19437 0.388743
74
3.7
0.0426 0.15762 0.472864
39
3.4
0.0224 0.07616 0.34645
27
3.8
0.0155 0.0589 0.29456
15
2.4
0.0086 0.02064 0.123847
9
3.1
0.0051 0.01581 0.110678
4
1.3
0.0023 0.00299 0.02392Related Questions
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