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competition with other organisms, because the environment is likely to change again. Traits that are
thought to be characteristic of r-selection include: high fecundity, small body size, early maturity
onset, short generation time, and the ability to disperse offspring widely.
Organisms whose life history is subject to r-selection are often referred to as r-strategists or r-selected.
Organisms with r-selected traits range from bacteria and diatoms, through insects and weeds, to
various semelparous cephalopods andmammals, especially small rodents.
K-selection (stable environments)
In stable or predictable environments, K-selection predominates as the ability to compete successfully
for limited resources is crucial and populations of K-selected organisms typically are very constant
and close to the maximum that the environment can bear (unlike r-selected populations, where
population sizes can change much more rapidly).
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