The literature on sperm competition tends to ignore a lot of disconfirming evidence, for example this http://webhost.lclark.edu/clifton/behav/human%20sperm%20competition.pdf … And I could go on and on...
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Replying to @DegenRolf
But also, see http://toddkshackelford.com/downloads/Baker-Shackelford-AJPA.pdf … … supporting an evolutionary history of sperm comp in Hominoidea
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Replying to @NicoleBarbaro @DegenRolf
How much evidence confirm and how much evidence disconfirm sperm competition? This is important to know 'cause we could cite evidence from two sides forever.
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Replying to @meistrephilipos @NicoleBarbaro
Rolf Degen Retweeted
For starters, it would be nice if the supporters of human sperm competition would seriously address the fundamental problems with the theory, as summed up here: https://twitter.com/YeyoZa/status/955799576405037058 …
Rolf Degen added,
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Replying to @DegenRolf @meistrephilipos
Current rates of cuckoldy or semen quality do not *necessarily* nullify a significant ancestral history of sperm competition in human lineage. Questions of origins/significant selection pressures are different than questions of maintenance/current utility
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Replying to @NicoleBarbaro @DegenRolf
Is it possible that any current factor interference in sperm production to the point of falsifying evidence on sperm competition q negative be corroborated in traditional societies? By the way, theres are evidence from tradicional societies?
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Replying to @meistrephilipos @DegenRolf
Yes, general health behaviors (e.g., smoking, prolonged heat on genital region-from laptops, for instance) can decrease semen quality, which *may* cause interference. To my knowledge, I'm not aware of experimental evidence from traditional societies--would definitely be helpful!
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Replying to @NicoleBarbaro @DegenRolf
Oh! Sure! I didn't think about this. But...Not even correlational evidence?
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Replying to @meistrephilipos @DegenRolf
Not sure off the top of my head, honestly, But here are two reviews of human sperm comp lit that may be of interest: http://toddkshackelford.com/downloads/Pham-Shackelford-ABC-2014.pdf … http://toddkshackelford.com/downloads/Goetz-et-al-ARSR-2007.pdf …
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Replying to @NicoleBarbaro @DegenRolf
So, it means that there are evidence about both sides of debate, but reviews seem to corroborate sperm competition. Is it possible to argue in that way?
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Yes because much of the research on human sperm comp has been primarily correlational. Aside from original Baker&Bellis studies, our recent study, & some work out of Leigh Simmons' lab, there is little experimental work. Without experiments, firm conclusions are difficult to make
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Replying to @NicoleBarbaro @DegenRolf
To the extent that sperm competition is a ultimate hypothesis about human behavior, sometimes I wonder about the explanatory power between correlational and experimental evidence. I dont know but sometimes seems that experimental design is greater in proximal questions.
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