Determinants of Life History
Many factors can determine the evolution of an organism's life history, especially the unpredictability of the environment. A very unpredictable environment—one in which resources, hazards, and competitors may fluctuate rapidly—selects for organisms that produce more offspring earlier in their lives, because it is never certain whether they will survive to reproduce again. Mortality rate may be the best indicator of a species' life history: organisms with high mortality rates—the usual result of an unpredictable environment—typically mature earlier than those species with low mortality rates, and give birth to more offspring at a time. A highly unpredictable environment can also lead to plasticity, in which individual organisms can shift along the spectrum of r-selected vs. K-selected life histories to suit the environment.
Read more about this topic: Life History Theory
Famous quotes containing the words life and/or history:
“Measure your health by your sympathy with morning and spring. If there is no response in you to the awakening of nature—if the prospect of an early morning walk does not banish sleep, if the warble of the first bluebird does not thrill you—know that the morning and spring of your life are past. Thus may you feel your pulse.”
—Henry David Thoreau (1817–1862)
“The principle that human nature, in its psychological aspects, is nothing more than a product of history and given social relations removes all barriers to coercion and manipulation by the powerful.”
—Noam Chomsky (b. 1928)