## Selection random

The concepts of **random** and **nonrandom elimination**(random and nonrandom selection) related to a certain degree to the concepts of *r-* and *K-strategies.* Individuals can be removed from the population either at random, and then the probability of the death of a certain individual will not depend in any way on his *genotype*, or differentially, in dependence on the *genotype* of the individual. A typical example of*random elimination *consists in the reduction of the population of plankton fauna by a filtrator.

It is apparent that *nonrandom elimination* is always accompanied by *natural selection*. It is less apparent that *random elimination* is also accompanied by *natural selection**.*While *nonrandom elimination *can lead to selection in favour of basically any trait, *random elimination* always selects in favour of rapid reproduction. Here, a certain connection can be seen with the model of *r-* and *K-strategies, *as most traits characteristic for *r-strategists *are in some way connected with a tendency to attain the maximum rate of reproduction. Consequently, some biologists are of the opinion that the existence of two different *strategies, r* and *K*, is based on differences between *random *and*nonrandom elimination* of superfluous individuals in the population.