TABLE 1.
Geographic and phenotypic data for parental and F2 generations
| Population | Location | Latitude, longitude | CPP (hr)a | SODb |
|---|---|---|---|---|
| A. Parental generation | ||||
| FL | NW Florida | 31.0°N, 86.5°W | 13.4 | Fourth instar |
| AB | NE Alberta | 57.5°N, 111.3°W | 17.4 | Third instar |
| Sex | Third instar | Fourth instar | Combined |
|---|---|---|---|
| B. F2 generation: mean CPP ± 2 SE (n) according to sex and instar of diapause | |||
| Female | 15.63 ± 0.17 (52) | 14.81 ± 0.12 (85) | 15.12 ± 0.12 (137) |
| Male | 15.79 ± 0.14 (86) | 15.26 ± 0.15 (42) | 15.62 ± 0.11 (127) |
| Combined | 15.73 ± 0.11 (137) | 14.96 ± 0.10 (127) | 15.36 ± 0.08 (264) |
a
CPP, critical photoperiod determined with increasing day length as in Lair et al. (1997).
b
SOD, stage of diapause determined at 30 days post-eclosion from larvae reared at 21° on diapause-inducing short days (light:dark = 8:16).