Genetic Variability of the Wing-Form Response to Photoperiod in a Subtropical Population of the Ground Cricket, Dianemobius fascipes

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Dianemobius fascipes is wing dimorphic, and its frequency of macroptery is controlled by photoperiod, temperature and larval density. In a local population of this cricket originated from Ishigaki Island (24°N, Japan), the genetic variability of the photoperiodic wing-form determination was assessed by examining 24 full-sib families. The percentage macroptery was highly variable among them, and its maximum occurring at 13 hr light/day (28℃, crowded) ranged from 15 to 95%. Although the basic pattern of the photoperiodic response was unchanged, the critical photoperiod was variable and inversely correlated with the general level of percentage macroptery. The heritability of the percentage macroptery was 0.7 in long days (≥ 13 hr light/day) but decreased to 0.3 in a short day of 11.5 hr, and that of the critical photoperiod was 0.36. In several mass-selected lines, the negative correlation between the critical photoperiod and the general level of percentage macroptery was confirmed. Selection for long-winged adults shortened the critical photoperiod and, conversely, selection for a short critical photoperiod increased the incidence of long-winged adults. The differences in the level of macropterism between the selected strains persisted in the responses to rearing density and temperature, but the response patterns to such non-photoperiodic cues were not modified by the selection. Thus, this local population holds a large amount of genetic variation in the liability to be macropterous, and the critical photoperiod varies in association with the genetic change in this liability, probably without any genetic shift of the threshold for the photoperiodic time measurement.
社団法人日本動物学会の論文
1993-12-15

Genetic Variability of the Wing-Form Response to Photoperiod in a Subtropical Population of the Ground Cricket, Dianemobius fascipes

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