Table 1.
Effects of inbreeding on measured male traits
| Trait | Mean (SD), N | ||
|---|---|---|---|
| Outbred (f = 0) | Moderately inbred (f =0.25) | Highly inbred (f = 0.5) | |
| Mating latency (min) | 24.5 (35.7), 52 | 40.4 (53.4), 53 | 45.8 (56.8), 49 |
| Remating day | 3.25 (0.54), 148 | 3.39 (0.65), 147 | 3.44 (0.67), 153 |
| Progeny production before remating | 73.6 (36), 48 | 72.0 (33), 46 | 92.1 (45), 48 |
| Progeny production after remating | 217 (45.1), 48 | 212 (42.9), 46 | 217 (50.0), 48 |
| Copulation duration with virgin (min) | 21.1 (5.7), 52 | 19.9 (4.4), 51 | 20.2 (5.3), 49 |
| Copulation duration with nonvirgin (min) | 25.4 (6.1), 147 | 23.8 (5.8), 146 | 24.8 (5.7), 151 |
| Sperm ejaculated by the second male | 1160 (295), 32 | 1170 (322), 33 | 1130 (258), 34 |
| Proportion of first male's sperm displaced | 0.23 (0.32), 28 | 0.36 (0.33), 27 | 0.30 (0.27), 33 |
| Second male's sperm stored in SR | 279 (46), 24 | 271 (67), 24 | 291 (92), 24 |
| Second male's sperm stored in SR and SPTH | 360 (78), 24 | 351 (91), 24 | 380 (130), 24 |
| First male's sperm in reproductive tract (5 h ASM) | 14.7 (19.9), 24 | 27.0 (32.6), 24 | 30.0 (34.7), 24 |
| Second male's sperm in female reproductive tract after 6 days ASM | 124 (93.3), 25 | 166 (107), 23 | 132 (101), 25 |
| First male's sperm in female reproductive tract 6 days ASM | 12.4 (27.7), 25 | 23.6 (43.2), 23 | 9.48 (20.9), 25 |
| Sperm length (mm) | 1.78 (0.051), 22 | 1.76 (0.059), 22 | 1.76 (0.074), 21 |
| Sperm swimming speed (μm/sec) | 28.7 (13.7), 20 | 28.4 (13.7), 20 | 30.0 (19.0), 20 |
Data for mating latency and copulation duration with virgin are from the single-mating productivity experiment. SR, seminal receptacle; SPTH, spermathecae; ASM, after the start of the second mating.