The weak boys got culled out and those boys that survived are hardier on average. They live longer.
More Quotes from Ralph Catalano:
It's not in her evolutionary interest to have a weak son in times of stress. He may not survive or may not be competitive for females.Ralph Catalano
It's better to have a female than a male in stressful times. If you have a daughter, her reproductive success is not contingent on robustness because males are not as picky.
Ralph Catalano
During the Kobe earthquake in Japan, sex ratio drops. The collapse of the east German economy, sex ratio drops. The major smog in London in 1952, sex ratio dropped. Variation in the economy such that you get very bad economic times in Sweden over a century and a half, sex ratio drops.
Ralph Catalano
The argument is that in most species, males will compete with each other for females, and females prefer robust males.
Ralph Catalano
You get rid of the weak, and on average the cohort lives longer.
Ralph Catalano
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