Table 1.
Fixed effects from linear models examining differences in sperm hook morphology across six Peromyscus species.
| Response | Model Term | Estimate (SE) | t | Pr(>|t|) |
|---|---|---|---|---|
| Hook length | Intercept | 1.37 (0.46) | ||
| head length | 0.60 (0.10) | 6.20 | <0.001 | |
|
P. eremicus
P. gossypinus P. californicus P. leucopus P. polionotus |
0.46 (0.06) 0.21 (0.06) 0.04 (0.05) −0.04 (0.06) 0.13 (0.06) |
7.88 3.55 0.79 −0.67 2.16 |
<0.001 <0.001 0.432 0.505 0.033 |
|
| Hook width | Intercept | 0.37 (0.10) | ||
| head width P. eremicus P. gossypinus P. californicus P. leucopus P. polionotus |
0.10 (0.03) 0.03 (0.01) 0.01 (0.02) −0.02 (0.02) 0.00 (0.02) −0.02 (0.01) |
2.93 3.47 0.53 −0.97 0.04 −1.73 |
<0.01 <0.001 0.594 0.332 0.971 0.086 |
|
| Hook area | Intercept | −0.08 (0.20) | ||
| head area P. eremicus P. gossypinus P. californicus P. leucopus P. polionotus |
0.11 (0.01) 0.29 (0.04) 0.21 (0.04) 0.20 (0.04) 0.18 (0.04) 0.16 (0.03) |
7.47 8.17 4.91 5.50 4.19 5.13 |
<0.001
<0.001 <0.001 <0.001 <0.001 <0.001 |
For each model, all rows are compared with the intercept—P. maniculatus. Significant results at the p < 0.05 level are bolded.