lecture 3 lh evol c -...

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Page 1: Lecture 3 LH Evol c - webpages.uidaho.edusnuismer/Nuismer_Lab/548/Lectures/Lecture...!"#$%&"'()''!*+",-*.$/&0' 1213$14/5'!*+",-*.$/&0'"6/7%4/5' 8*&$-' 9&/:$-' ;1$%&14/5' &"3&/2%#4/5

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Clutch size

Lack clutch size optimum

Clutch size Survival probability Maternal fitness1 0.95 0.952 0.9 1.83 0.8 2.44 0.7 2.85 0.6 36 0.5 37 0.4 2.88 0.3 2.49 0.2 1.810 0.1 1

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r selection K selectionEnvironment Variable, resource rich Stable, competitive

Population size Variable in time High density

Mortality Density independent Density dependent

Traits favored Rapid developmentHigh population growth traitsEarly reproductionSmall body sizeSemelparityShort lifespan

Slow developmentCompetitive traitsDelayed reproductionDelayed maturityLarger body sizeIteroparityLong lifespan

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Fitness gain Fitness loss:trade-offs

Offspring survival higher rate of offspringsurvival (parental care orexperience)

More time in juvenileperiod, exposed toextrinsic mortality

Larger body size Increased female fecundity,male mating success

Decreased adult predation

Lower chance tosurvive to maturity,longer generationtime (discounting)

Demographic Higher adult survival,fecundity

Longer generationtime, lower r

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Hughes, Kimberly A. et al. (2002) Proc. Natl. Acad. Sci. USA 99,

14286-14291

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