He illustrates this with the example of greed, which was adaptive in palaeolithic times because greedy people who then did not share their food stores survived and enjoyed high Darwinian fitness
"Both economical locomotion and physical fighting are important performance traits to many species because of their direct influence on components of Darwinian fitness
," the study says, referring to how well a living thing reproduces and passes on its genes to the next generation.
They say this is nothing more than the process of Darwinian fitness
, and that we should let natural selection take its course.
"Under natural selection, you would expect organisms to use their resources to produce more genetic descendants, and so increase their Darwinian fitness
. The demographic transition is a puzzle because at first sight it doesn't look like people are doing this," lead author Dr Anna Goodman, Research Fellow at the London School of Hygiene and Tropical Medicine, said.
But, as stated by Valladares (1999) "although Darwinian fitness is conceptually straightforward, it is extraordinarily difficult to measure directly" and "can be measured only in relative terms, and usually through indirect parameters such as longevity, size, or growth which are frequently correlated with Darwinian fitness." Falconer (1989) further complicates the concept by reminding us that "...
From an agricultural viewpoint, Darwinian fitness is often not relevant because artificial selection is practiced.
Inclusive fitness: The sum of an individual's Darwinian fitness
(personal reproductive success) and his or her influence upon the Darwinian fitness
of relatives, weighted according to their coefficients of relatedness to the focal individual.
This assumption seems likely because both of the aforementioned particular mutations were described in spontaneous mutants of H37Rv obtained in vitro and had a Darwinian fitness
slightly less than or equal to that of the rpoB wild-type-susceptible parental strain (9).
Disgust, naturally, works against digesting poisons; fears prepare us to meet dangers; the pursuit of happiness is a (calibrated) way of striving after Darwinian fitness
; anger is one of the moralistic emotions--the strategies in the reciprocity game among humans--the particular function of which is to cause desire to punish the cheaters among us (Trivers 1985); and finally, romantic love is an emotion that ensures the unconditionality of pair bonding.
The genetical evolution of patterns of sexuality: Darwinian fitness