Supplementary Figure 1: Testis size index during late winter and spring.
From: A supergene determines highly divergent male reproductive morphs in the ruff
(a) The shaded area delineates the sampling window used to calculate log-transformed testis size residuals during the period of gonadal recrudescence (Fig. 1d). (b) Modeled relationship (solid line) between log testes index and date from a regression of log-transformed testis size index against date and date2 during the sampling window (F2,36 = 7.62, P = 0.0002). Points, residuals; shaded area, 95% confidence limits; dashed lines, 95% prediction limits.
