Aspects of the rK Concept Used Today

As the last section has made clear, the reason why the r/K concept is included in today's ecological textbooks and this encyclopedia is not because it is still widely used or considered to be correct. The reasons are that the concept is historically important and that two of its aspects are still in use. The first one is that life-history traits show patterns within and among species: they do not vary randomly but correlate to each other, an observation that has led to the concept of fast and slow life histories. The second preserved aspect is the basic idea of Dobzhansky, MacArthur, and Wilson that heavily populated and stable environments select for different traits than less populated and fluctuating environments. We shall comment on both aspects below.

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