Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Periods of time when resources limit the ability of a species population to sustain itself and recover in size are the basis of the storage effect. Knowing how a particular species deals with resource limitations is important for conservation efforts dealing with aquatic and terrestrial species. Depending on a particular species'' life cycle a population can recover from low numbers even though it has been reduced to low levels whereas other species may need large population size every year to maintain.