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11 Cards in this Set
- Front
- Back
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what two factors do static life tables measure; name two columns in table
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mortality and survivor rates
-columns: number of survivors, number of deaths |
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what are the 3 main types of curves for static life tables
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I - large mammals, increased parental care
II - mortality rate is constant throughout life III - oysters, urchins, sessile marine life; high mortality rate at early stages, but survive well after a certain point |
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what two factors do cohort life tables measure; name 3 columns of table
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follow cohort of individuals and measure survival and fecundity
-n: survivors -l: proportion of survivors -m: avg number of offspring per individual |
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what does Ro represent, describe importance of 3 possible values
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Ro is the net reproductive rate
>1 population increasing =1 population steady < 1 population decreasing |
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what are the 4 varying traits/strategies in survival and reproduction
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-age at first reproduction
-number of reproductive cycles (semelparous = one big bang reproduction; iteroparous = multiple cycles) -number of offspring per cycle (parental care) -lifespan |
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describe relationship between parental care and number of offspring
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increased parental care leads to fewer offspring
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describe relationship between fecundity and mortality rate
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with increased fecundity comes increased mortality
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describe relationship between age at first reproduction and survival rate
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older age at first reproduction leads to increased survival rate
-younger age at first reproduction leads to decreased survival rate aka earlier death |
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describe main differences between r and K selection
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r: quantity, unstable, fast growing, small numerous seeds, semelparous, short life span, good disperser, poor competitor
K: quality, stable, slow growing, few large seeds, iteroparous, long life span, poor disperser, good competitor |
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describe how black death, industrial revolution, and medical advances have affected human population
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-black death: big dip in population
-industrial revolution: exponential growth -medical advances: another exponential growth |
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describe human population size/growth historically vs currently
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historically: steady state
currently: recent exponential growth |
