chapter 9, life histories
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13 Terms
life history
the schedule of an organisms growth, development, reproduction and survival.
they are:
genetically based and heritable
subject to natural selection
considered to maximize fitness
fecundity
the number of offspring reproduced by an organism per reproductive episode
parity
the number of reproductive episodes than an organism than an organism experiences.
can either be
semelparous
iteroparous
semelparous
species reproduce one time within their lifetime
iteroparous
species reproduce multiple times in their lifetimes
longevity
the lifespan of an organism (life expectancy)
can either be
annual
perennial
annual
an organism with a 1 year life expectancy
perennial
an organism that has a lifespan of over a year
life histories are shaped by
trade offs
principle of allocation
when limited finite resources are devoted to one bodily structure physiological function, or behavior, aka growth, defense or reproduction. they cannot be allotted to another.
life histories are genetic traits that are selected to maximize
fitness
life histories are sensitive to environmental cues to
maximize fitness under specific conditions
a photoperiod is simply a
day length