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. Author manuscript; available in PMC: 2024 Oct 1.
Published in final edited form as: J Evol Biol. 2023 Sep 10;36(10):1393–1410. doi: 10.1111/jeb.14219

Figure 5. Postmating prezygotic isolation between at least one species pair.

Figure 5.

Crossing success (probability of producing at least one seed from a cross) for intra- and interspecific cross types. Shown are least-square means and asymptotic confidence intervals from a Firth binomial model. Letters indicate significance in post-hoc Tukey tests; cross types sharing a letter are not significantly different. One interspecific cross type, FxB, was significantly reduced compared to both intraspecific parental crosses, indicating an asymmetric barrier to fruit set. One cross, BxJ, was significantly reduced compared to the maternal (BxB) parent but not the paternal (JxJ) parent. Two other crosses, FxS and SxF, had low fruit set possibly indicating a reproductive barrier, but were not significant in the model due to low sample sizes; e.g., 0 out of 4 SxF crosses resulted in seeds. J = M. johnstonii, B = M. brevipes, F = M. fremontii, S = Sespe creek population. Cross types are listed as (maternal x paternal).