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Bateman's Data: Inconsistent with "Bateman's Principles".

Thierry Hoquet1, William C Bridges2, Patricia Adair Gowaty3

  • 1Department of Philosophy University Paris Nanterre France.

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|October 19, 2020
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Summary
This summary is machine-generated.

Bateman's Principles on sexual selection and variance in reproductive success are challenged. Re-analysis of Bateman's data reveals no sex differences in variance, contradicting his original predictions.

Keywords:
Bateman (1948)sex differencessexual selectionvariance in number of matesvariance in reproductive success

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Sexual Selection Theory

Background:

  • A.J. Bateman's 1948 study proposed "Bateman's Principles" regarding sex differences in variance in number of mates (V_NM) and reproductive success (V_RS) as a metric for sexual selection.
  • Bateman predicted greater V_RS and V_NM in males, with a stronger positive relationship between V_NM and V_RS in males.
  • Previous empirical challenges and methodological critiques have questioned the validity of Bateman's original conclusions.

Purpose of the Study:

  • To re-evaluate Bateman's predictions using his archived laboratory data.
  • To address methodological limitations identified in Bateman's original study and subsequent replications.
  • To test for sex differences in V_NM, V_RS, and the relationship between them.

Main Methods:

  • Analysis of A.J. Bateman's archived, handwritten laboratory notes from 65 unique populations.
  • Application of Punnett's tests to assess the validity of offspring phenotypes derived from parental mutations.
  • Statistical analysis of unbiased populations to compare V_RS and V_NM between sexes and examine the relationship between V_NM and V_RS.

Main Results:

  • Of the 65 populations, 41.5% failed Punnett's tests, indicating undercounting of parents' number of mates (NM) and V_NM due to biased methods.
  • In the 34 unbiased populations, no significant sex differences were found in V_RS or V_NM.
  • Regressions revealed weak, positive, significant associations between V_NM and V_RS for both females and males, contrary to Bateman's prediction of a stronger male association.

Conclusions:

  • Bateman's original data, when analyzed with unbiased methods, are inconsistent with "Bateman's Principles."
  • The study found no evidence for sex differences in V_RS or V_NM, challenging a cornerstone of sexual selection theory.
  • The relationship between V_NM and V_RS is similar for both sexes, not stronger in males as predicted by Bateman.