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19 Cards in this Set
- Front
- Back
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x
What is it called? |
Age in years
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Nx
What is it called? |
Observed # of birds alive
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lx
What is it called? Calculated how? |
Proportion surviving
n? / n1 1.00 1st # |
|
dx
What is it called? Calculated how? |
no. DYING w/in interval
n? - n?+1 |
|
qx
1) What is it? 2) Formula? |
1) Mortality rate
2) dx / nx |
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Lx
What is it? Calculated how? |
Avg # LIVING
alive + half dead |
|
Tx
What is it called? Calculated how? |
individual TIME factor
add up rows - sum Lx |
|
ex
What is it called? Calculated how? |
avg EXPECTATION of further life
Tx \ nx |
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bx
What is it called? |
# female BIRTHS per female
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Vx
What is it called? Calculated how? |
age-specific reproductive VELOCITY
= bx * lx (# f produced per f * prop. surviving) |
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R0
What is it? Calculated how? |
Net reproductive rate
Sum of Vx |
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1) How many more years will animal @ age 3 be expected to live?
2) Age of death? |
1) ex
2) ex + 3 |
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What proportion of the cohort survives to age 5?
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lx @ 5
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What is the mortality rate of the cohort at age 8?
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qx @ 8
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Draw a survivorship curve for this cohort.
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lx(% survival)
vs x(age) |
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6. What can you conclude about the life history and growth characteristics for this population
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Type 1/2/3 survivorship
R0 = rate of increase |
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Survivorship Curve where # of survivors drops dramatically in old age.
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1
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Survivorship Curve where # of survivors drops dramatically in young age.
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3
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Survivorship Curve where # of survivors drops equally across age ranges.
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2
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