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. 2017 Oct 18;35(2):312–334. doi: 10.1093/molbev/msx271

Table 4.

Linear Regression of PMPZ RIMs in Sympatric and Allopatric Lines.

Sympatric Lines
Allopatric Lines
Origin Effect
Mean SD Mean SD Degrees of Freedom (numerator, denominator) F Value P Value
Premating isolation 0.702 0.580 0.703 0.584 17,306 1.1462 0.3089
NCGI 0.8938 0.0751 0.8644 0.0966 11,141 6.9568 2.561 × 10−9
CSP 0.1488 1.5807 0.1434 1.7568 18,88 0.4602 0.9679
Postzygotic isolation 0.5036 0.2687 0.5142 0.2824 12,203 2.2074 0.01262
Postzygotic isolation—embryonic lethality 0.0905 0.1909 0.0905 0.1900 12,203 1.6188 0.08846
Postzygotic isolation—larval lethality 0.2280 0.2231 0.2224 0.2388 12,203 1.3817 0.1767
Postzygotic isolation—pupal lethality 0.2048 0.1923 0.2282 0.2058 12,203 0.6689 0.7801

Note.—Linear models show no difference at the strength of most types of RI between sympatric and allopatric pairs of lines. The only RIM that shows an origin effect is NCGI, whose significance is exclusively driven by the cross ♀D. yakuba × ♂D. santomea (Matute 2010). When this cross is excluded, the origin effect is not significant anymore (F10,123 = 1.7319, P = 0.0808).