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Table 2 Standardized linear (β) and quadratic (γ) selection gradients (± SE) derived from regressions between male mating success and body length (TTL) or between male mating success and FTG length (see Figure 2 for abbreviations) in a natural population and in two sets of simulated data.

From: Size-assortative mating and sexual size dimorphism are predictable from simple mechanics of mate-grasping behavior

Natural population Directional selection gradient Stabilizing/Disruptive selection gradient
  β p γ p
TTL 0.014 ± 0.042 0.739 0.114 ± 0.072 0.311
FTG -0.003 ± 0.042 0.934 0.012 ± 0.070 0.937
Simulation 1     
FTG 0.182 ± 0.040 < 0.001 -0.074 ± 0.066 0.269
Simulation 2     
FTG 0.054 ± 0.042 0.198 -0.178 ± 0.070 0.012
  1. In Simulation 1 female size distribution was shifted towards larger values. In Simulation 2 the variation of male size distribution was increased. P-values in the table were calculated by the least squares analysis. But p-values were also determined by logistic regression and the resulting statistically significant (p < 0.05) selection coefficients are given in bold.