r” and “K” strategy among organisms
“r” and “K” strategy among organisms.
Ecologists have used the two variables from our population model (“r” and “K”) to define end members in the spectrum of animal behavior. As you might expect, “r”-selected species rely on a high intrinsic population growth rate in order to succeed. These are “weedy” species which disperse quickly to find newly opened environments, have very many offspring (but small – only a very small portion of the parents reproductive resources are devoted to any single juvenile ???????), and are generally poor competitors.
“K”-selected species are just the opposite. The are weak dispersers, devote a large amount of their reproductive resources to only one or a few offspring, and are strong competitors. Note in the figure below (Survivorship curves) that Type III species are “r”-strategists which have large numbers of offspring, but with a very low survival rate. Type I species would represent “K”-strategy, in which most individuals survive into “old” age.
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