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A note on competition
Author
C. B. HuffakerAuthor Affiliations
C. B. Huffaker was Professor of Entomology and Entomologist in the Experiment Station, Berkeley.Publication Information
Hilgardia 37(14):563-567. DOI:10.3733/hilg.v37n14p563. August 1966.
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Abstract
The experiments described in this paper are part of a continuing series on predator-prey interactions. The six-spotted mite, Eotetranychus sexmaculatus (Riley), was used for the study, which involved various ecosystems containing combinations of oranges and rubber balls, over which the mites moved in search of food. Effects of food dispersion on equilibrium level of a population, changes in its numbers, and its utilization of a limited resource were studied. Two main points are emphasized: First, food may be a limiting and regulating factor for a given population even if utilization of supply at equilibrium is low. Second, in some particular kinds of ecosystems, where competition for food is the regulating factor, superimposition of other mortality factors may alter the density level at which the competition is regulative, and thus result in levels of food utilization varying from low to high. Roles and importance of density-dependent and density-independent factors in the natural control of populations are also discussed.
A note on the definition and ecological implication of the term “competition” is included.
Literature Cited
Allee W. C., Emerson A. E., Park O., Park T., Schmidt K. P. Principles of animal ecology. 1949. Philadelphia: W. B. Saunders Company. 837p.
Andrewartha H. G., Birch L. C. The distribution and abundance of animals. 1954. Chicago: University of Chicago Press. 782p.
Bakker K. An analysis of factors which determine success in competition for food among larvae of Drosophila melanogaster. Arch. Neerl. Zool. 1961. 14:200-81. DOI: 10.1163/036551661X00061 [CrossRef]
Birch L. C. The meanings of competition. Amer. Naturalist. 1957. 91(856):5-18. DOI: 10.1086/281957 [CrossRef]
Brian M. V. The structure of a natural dense ant population. Jour. Anim. Ecol. 1952. 21(1):12-24. DOI: 10.2307/1907 [CrossRef]
Chitty D. Population processes in the vole and their relevance to general theory. Canad. Jour. Zool. 1960. 38(1):99-113. DOI: 10.1139/z60-011 [CrossRef]
Christian J. J. A review of the endocrine response in rats and mice to increasing population size including delayed effects on offspring. Lecture Rev. Series. No. 1957. 57-2: Beltsville, Maryland: U. S. Naval Med. Res. Inst.
Clements F. E., Shelford V. E. Bio-ecology. 1939. London: John Wiley and Sons, Inc. 425p.
Darwin Charles. On the origin of species by means of natural selection, or the preservation of favored races in the struggle for life. 1859. London: Cassell and Co., Ltd. 430p. 1909
Huffaker C. B. The concept of balance in nature. Proc. 10th Internatl. Congr. Entom. (Montreal, 1956). 1958. 2:625-36.
Huffaker C. B., Messenger P. S., DeBach P. The concept and significance of natural control. Biological control of insect pests and weeds. 1964. New York, London: Reinhold Publ. Corp. 844p. Chapman and Hall Ltd.
Huxley J. S. Evolution in action. 1953. New York: Harper and Bros. 182p.
Klomp H. Intraspecific competition and the regulation of insect numbers. Ann. Rev. Ent. 1964. 9:17-40. DOI: 10.1146/annurev.en.09.010164.000313 [CrossRef]
Milne A. Definition of competition among animals. In Mechanisms in biological competition. Symp. Soc. Exptl. Biol. 1961. 15:40-61.
Nicholson A. J. The balance of animal populations. Jour. Anim. Ecol., supplement to vol. 1933. 2(1):132-78.
Nicholson A. J. The role of competition in determining animal populations. Jour. Counc. Sci. Indus. Res. (Australia). 1937. 10(2):101-06.
Nicholson A. J. An outline of the dynamics of animal populations. Australian Jour. Zool. 1954. 2(1):9-65. DOI: 10.1071/ZO9540009 [CrossRef]
Odum E. P. Fundamentals of ecology. 1959. Philadelphia and London: W. B. Saunders Company. 546p.
Schmalhausen I. I. Factors of evolution; the theory of stabilizing selection. 1949. Philadelphia: Blakiston Company. 327p.
Solomon M. E. Dynamics of insect populations. Ann. Rev. Ent. 1957. 2:121-42. DOI: 10.1146/annurev.en.02.010157.001005 [CrossRef]
Weaver J. E., Clements F. E. Plant ecology. 1938. New York: McGraw-Hill Company. 601p.
Wellington W. G. Qualitative changes in natural populations during changes in abundance. Canad. Jour. Zool. 1960. 38(2):289-314. DOI: 10.1139/z60-036 [CrossRef]
Williamson M. H. An elementary theory of interspecific competition. Nature. 1957. 180:422-25. DOI: 10.1038/180422a0 [CrossRef]
Wynne-Edwards V. C. The control of population-density through social behavior: a hypothesis. Ibis. 1959. 101:436-41. DOI: 10.1111/j.1474-919X.1959.tb02400.x [CrossRef]