32-PopulationGrowth

32-PopulationGrowth - Fact of the day Life tables The...

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Fact of the day
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Life tables The construction of life tables = demography table represents ages and life expectancy of all the members of a population developed by censusing a population various ways to census all measure population structure
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Fact of the day
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Fact of the day
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Fact of the day
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Demography - Life tables Dall sheep life table, based on skulls of 608 sheep standardized to 1000 individuals
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Dall sheep life table, based on skulls of 608 sheep “survivorship”
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0 0.5 1 1.5 2 2.5 3 3.5 Age (years) 1 14 2 3 4 5 6 7 8 9 10 11 12 13 Type 1 survivorship curve Note the logarithmic scale
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Can characterize Life-history = survivorship curve Type I Most die when older Vertebrates or organisms w/ parental care Small dip at young age
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Types of survivorship curves Type I Most individuals are lost when they are older Vertebrates or organisms that exhibit parental care and protect their young Type II Almost linear rate of loss Many birds and some invertebrates
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Type II Survivorship Curve
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Types of survivorship curves • Type I – Most die when older – Vertebrates or organisms w/ parental care – Small dip at young age • Type II – linear rate of loss – Many birds, invertebrates • Type III – many lost in juvenile stage – Invertebrates, many plants, and marine invertebrates without parental care – Predation, establishment
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32-PopulationGrowth - Fact of the day Life tables The...

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