my brain is breaking...I think early age at menarche is an elite trait in europe & that euro elites are r-selected compared to peasants o.0
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Replying to @sarahdoingthing
(we are talking 10th century-19th century)
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Replying to @sarahdoingthing
Elites face selection pressures similar to groups at the front of a migration wave - available resources reward earlier reproduction.
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Replying to @sarahdoingthing
A complex society develops an elite whose offspring have very high rates of survival - like being in a constant state of range expansion.
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Replying to @sarahdoingthing
Most descendants of elites end up outside the elite, without any extra resources - they have to go back to slow life histories.
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Replying to @sarahdoingthing
But gene flow is one way - effective elite isolation. Genes to deal with the harmful effects of extra food and fast life history can appear.
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Replying to @sarahdoingthing
And even though they're irrelevant to most peasants, they could sneak into the general population by "surfing" the permanent expansion wave.
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Replying to @sarahdoingthing
Descendants of elites and populations that had hyperfertile elites may be better adapted to deal with sudden food excess.
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Replying to @sarahdoingthing
Whereas descendants of simple societies never had any source of get-rich-and-r-selected-safely genes.
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Replying to @sarahdoingthing
So age at menarche plummets between ancestral African populations and contemporary African Americans, with changing diet and resources.
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But comparable white populations seem to have changed much less on that metric. ok sorry I think that's all
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Replying to @sarahdoingthing
@sarahdoingthing this whole thread, my brain, just…0 replies 0 retweets 1 likeThanks. Twitter will use this to make your timeline better. UndoUndo
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