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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> | 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> | ||
Competition is also present between species ("interspecific"). When resources are limited, several species may depend on these resources. Thus, each of the species competes with the others to gain access to the resources. As a result, species less suited to compete for the resources may [[extinction|die out]] unless they [[adaptation|adapt]] by character dislocation, for instance. | |||