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individual fitnessIndividualfitness (ger.)

  • The fitness of an individual, especially its probability of survival (in contrast to its probability of reproduction).
    Success in the civil war, where each is fighting against all, is determined by individual fitness and self-reliance. But success in the foreign war is determined by what may be termed tribal fitness and mutual dependence [...].
    What I have called tribal fitness—in contradistinction to individual fitness—begins with the family, developes in the community (herd, hive, clan, &c), and usually ends with the limits of the species
    Romanes, G.J. (1892). Darwin and After Darwin, vol. 1. An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions: 267; 268.
    differences may be established by two different types of genetic selection which Darwin distinguished as Natural Selection and Sexual Selection. The first possibility implies that the mutations which originally exhibited the sex-limited differences were conserved by virtue of greater individual fitness capable of being expressed in terms of viability and fertility. The second possibility implies a form of assortative mating
    Gordon, C. & Gordon, F. (1939). The genetical analysis of a sex-linked character in Drosophila melanogaster and its bearing on the evolution of secondary sexual characteristics. Proc. Roy. Soc. London Ser. B 127, 487-510: 488.