By Allan B. Cobb
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Additional info for Animal Sciences: 4
New York: Worth Publishers, 1989. , and William T. Keeton, and Carol Grant Gould. Biological Science, 6th ed. New York: W. W. , 1996. 29 Populations Krebs, Charles J. Ecology: The Experimental Analysis of Distribution and Abundance. New York: Harper Collins College Publishers, 1994. , Jr. Population Dynamics: Alternative Models. New York: Academic Press, 1979. Pianka, Eric R. Evolutionary Ecology. New York: Addison Wesley Longman, 2000. , and Gary L. Miller. Ecology, 4th ed. New York: W. H. Freeman, 2000.
Biological species are sometimes placed on a continuum between rselected and k-selected, depending on whether their population dynamics tend to correspond more to exponential or logistic growth. In r-selected species, there tend to be dramatic fluctuations, including periods of exponential growth followed by population crashes. These species are particularly suited to taking advantage of brief periods of great resource abundance, and are specialized for rapid growth and reproduction along with good capabilities for dispersing.
Any reduction in the population of insects will result in a loss of species from either bird population. There may not be enough food to feed and rear the young. Older birds unable to fly long distances for alternate food will also perish. Food is not the only limiting factor that affects carrying capacity. Shelter and places to safely rear young are also part of the limits for many populations. Ground squirrels often rear their young underground or in rock shelters. This protects the young from predators, such as foxes or birds of prey.