eco extra
Terms
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- misconceptions about evolution
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-evolution explains the origin of life on earth
-evolution has never been observed
-evolution produces organisms that are perfectly adapted to their environments
-evolution means life changes by chance - requirements for natural selection
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-variation in traits
-differential survival/reproduction due to these traits - categories of adaptations
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-physiological
-morphological
-behavioral - factors limiting distribution and abundance
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-history
-habitat suitability
-dispersal - different forms of rarity are influenced by
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-geographic range
-habitat specificity/tolerance
-local population size - factors influencing dispersal
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-resource availability and distribution
-distance of dispersal
-individual behaviors
-presence of dispersal facilitators - dispersal vs migration
- -to/from new locations vs seasonal movement
- change in population size from 4 things
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-birth
-death
-immigration
-emigration - age distribution reflects history of
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-survival
-reproduction
-potential for future growth - Nsubt
- -current population size
- N sub t+x
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-future population size
-x=time step of interest - Geometric Growth
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-N0lambdat
-insects/plants that live for one year and reproduce once before they die - Exponential Growth
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-whooping cranes
-dN/dt=rN
-dN=change in # of $ over small amount of time, r=interest rate, N=# of $ - Logistic Growth
- -dN/dt=rN(1-N/K)
- advantages of sex
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-reduces the risk of extinction
-breaks down deleterious combination of alleles
-allows new combos of advantageous alleles - Paradox of sex
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-energetically expense
-risky
-recombination destroys adaptive combos of genes