Adaptations –Maximize growth rate when lacking limiting factors r-strategists r = growth rate (births-deaths) –Maintain population size near K K-strategists K = carrying capacity Reproductive Strategies
r-strategists Mature rapidly Short lived Tend to be prey Many offspring (overproduction) Low parental care most pest species are r- selected K-strategies Mature slowly Long lived Tend to be predators Few offspring High parental care Most endangered species are K-species
Reproductive Strategies r-strategists Wide fluctuations in population Usually small Limited by independent factors K-strategies Stabilized population Larger Limited by dependent factors
At what point during an organism’s life does it die? Curves show age distribution characteristics, reproductive strategies, and life history Curves represent balance between resource limitations and competition Survivorship Curves
TypeDescription I. Late LossReproduction occurs fairly early in life. Low mortality at birth. High probability of surviving until old age II. Constant LossAll ages have fairly uniform death rate. Death usually due to predation III. Early LossLarge numbers of offspring. High death rate for young, declines with age. Survivorship Curves
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