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Competition within, between, and among species is one of the most important forces in biology, especially in the field of [[ecology]].<ref name="Keddy, P.A 2001">Keddy, P.A. '''2001'''. ''Competition'', 2nd ed., Kluwer, Dordrecht. 552 p.</ref> | Competition within, between, and among species is one of the most important forces in biology, especially in the field of [[ecology]].<ref name="Keddy, P.A 2001">Keddy, P.A. '''2001'''. ''Competition'', 2nd ed., Kluwer, Dordrecht. 552 p.</ref> | ||
Competition between members of a species ("intraspecific") for resources such as [[food]], [[water]], [[Territory (animal)|territory]], and [[sunlight]] may result in an increase in the frequency of a variant of the species best suited for survival and reproduction until its fixation within a population. However, competition among resources also has a strong tendency for diversification between members of the same species, resulting in coexistence of competitive and non-competitive strategies or cycles between low and high competitiveness. | Competition between members of a species ("intraspecific") for resources such as [[food]], [[water]], [[Territory (animal)|territory]], and [[sunlight]] may result in an increase in the frequency of a variant of the species best suited for survival and reproduction until its fixation within a population. However, competition among resources also has a strong tendency for diversification between members of the same species, resulting in coexistence of competitive and non-competitive strategies or cycles between low and high competitiveness. Third parties within a species often favour highly competitive strategies leading to species extinction when environmental conditions are harsh ([[evolutionary suicide]]).<ref>{{cite journal|last1=Baldauf|first1=Sebastian A.|last2=Engqvist|first2=Leif|last3=Weissing|first3=Franz J.|title=Diversifying evolution of competitiveness|journal=Nature Communications|date=29 October 2014|volume=5|pages=5233|doi=10.1038/ncomms6233|pmid=25351604|bibcode=2014NatCo...5.5233B|url=https://pure.rug.nl/ws/files/62238029/Diversifying_evolution_of_competitiveness.pdf|access-date=4 September 2019|archive-url=https://web.archive.org/web/20190904155202/https://pure.rug.nl/ws/files/62238029/Diversifying_evolution_of_competitiveness.pdf|archive-date=4 September 2019|url-status=dead}}</ref> | ||