2019 Life History Tables Summarize information on age structure size life

2019 life history tables summarize information on age

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© 2019 Life History Tables Summarize information on age structure, size, life-history (reproductive) stage, and survivorship of a population Used to predict how a population will change over time Useful in managing: crops, agricultural conservation efforts pest/weed control
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© 2019 Age Structure Pyramids Snapshot of a particular point in time F 29.23a
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© 2019 Life History Tables Survival rate (s x ) Note the error on page 752 Table 29.1 Survivorship (l x )
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© 2019 Data from: Smith (1988; in Lifetime Reproductive Success; Clutton-Brock (ed.)) Legend x – age n x – # of females at each age (x) s x – survival rate from one age to the next l x – survivorship (fraction of original cohort still alive) m x – fecundity (# female offspring each female produces) R 0 – net reproductive rate ( avg . # female offspring per female in cohort) x (years) n x s x l x m x l x • m x 0 72 0.375 1.0 0 1 27 0.667 0.375 1.8 2 18 0.278 0.250 2.1 3 5 0.800 0.069 1.8 4 4 0.750 0.056 5 5 3 0.667 0.042 4 6 2 0 0.028 0 7 0 - 0 0 R 0
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© 2019
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© 2019 Survivorship Curves F 29.7
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© 2019 How to Detect Constant Mortality (Type 2 Survivorship)? Survivorship in graphical form 50% 25% 5% l x • 100
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© 2019 Patterns of Survivorship Number of individuals alive (survivorship) Age class (years) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 1 2 3 4 5 6 7 Log Survivorship Age (years) Age (y) Log(nx) Linear scale Semi-log scale
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