generic cycles, theory of

views updated May 14 2018

generic cycles, theory of A theory which envisages a life cycle for a species or genus that resembles that of an individual. The first stage is characterized by vigorous spread; the second by maximum phyletic activity giving rise to new forms; the third marks a phase of decline in area, owing to competition within the offspring species; and the fourth and final stage sees the extinction of the species. Although in many ways a useful analogy, there is no evidence that species become senile and die out spontaneously.

generic cycles, theory of

views updated May 11 2018

generic cycles, theory of A theory that envisages a life cycle for a species or genus that resembles that of an individual. The first stage is characterized by vigorous spread; the second by maximum phyletic activity giving rise to new forms; the third marks a phase of decline in area owing to competition within the offspring species; and the fourth and final stage sees the extinction of the species. Although in many ways a useful analogy, there is no evidence that species become senile and die out spontaneously.

generic cycles, theory of

views updated May 18 2018

generic cycles, theory of A theory that envisages a life cycle for a species or genus analogous to that of an individual. The first stage is characterized by vigorous spread; the second by maximum phyletic activity giving rise to new forms; the third marks a phase of decline in area due to competition within the offspring species; and the fourth and final stage sees the extinction of the species. Although in many ways a useful analogy, there is no evidence that species become senile and die out spontaneously.

theory of generic cycles

views updated May 17 2018

theory of generic cycles See generic cycles, theory of.

theory of generic cycles

views updated Jun 08 2018

theory of generic cycles See GENERIC CYCLES, THEORY OF.

theory of generic cycles

views updated May 23 2018

theory of generic cycles See GENERIC CYCLES, THEORY OF.

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theory of generic cycles

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