TY - JOUR
TI - Studies on the ecology of insects sterilized artificially (gamma radiation), 8. Experimental analysis of the sexual competitiveness between normal males of the oriental fruit fly and males sterilized by the /sup 137/Cs gamma radiation
AB - Gamma-ray irradiation of 7 KR from /sup 137/Cs on the oriental fruit fly pupae two days before emerging did not significantly reduce the percentage of emergence and longevity of adult flies. However, highly sterile adults (more than 98.9%) were found in those combinations, S..gamma.. x N/sup -/, N..gamma.. x S/sup -/ and S..gamma.. x S/sup -/. The result of observation of sperm activity in spermathecae of females mated with sterilized males showed that the sterility is caused by dominant lethalities. The sexual competitiveness between S..gamma.. and N..gamma.. has been examined in experiments of S..gamma.. x N..gamma.. x N/sup -/. (1) The data suggest that the sterility percentage concerning with egg hatchability is proportional to the rate of sterilized males replaced for normal males when that is expressed with a multiple of the ratio of normal males to normal females. Seven such straight lines thus obtained made us possible to find the theoretical expectation of sterility percentage. (2) Relationship between the percent egg hatch observed (y), or that estimated theoretically (Y), and logarithm of ratio, S..gamma../N..gamma.. (x) was showed to be two straight regression equations, y=18.413-11.952 (x - 1.295) and Y=11.890-15.462 (x - 1.295). Ratio of regression coefficients of the equations was 0.772. (3) Correlations between the sterility percentage and ratio, S..gamma../N..gamma.., showed in three convex curves under three degrees of competitiveness (0.265, 0.576 and 1.001). When both the values of S..gamma../N..gamma.. in the mating experiments and the sterility percentages are given, it is possible to obtain degrees of competitiveness using the curves.
AU - Kiyoku, M
AU - Tsukuda, R [Okayama Univ. (Japan). Faculty of Agriculture]
KW - 63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
KW - FRUIT FLIES
KW - RADIOSTERILIZATION
KW - PEST CONTROL
KW - STERILE MALE TECHNIQUE
KW - BIOLOGICAL RADIATION EFFECTS
KW - DOSE RATES
KW - DOSE-RESPONSE RELATIONSHIPS
KW - GAMMA RADIATION
KW - IRRADIATION
KW - MALES
KW - PUPAE
KW - STERILITY
KW - SURVIVAL CURVES
KW - ANIMALS
KW - ARTHROPODS
KW - BIOLOGICAL EFFECTS
KW - ELECTROMAGNETIC RADIATION
KW - FLIES
KW - INSECTS
KW - INVERTEBRATES
KW - IONIZING RADIATIONS
KW - RADIATION EFFECTS
KW - RADIATIONS
KW - STERILIZATION
KW - 560156* - Radiation Effects on Animals- Pest Control- (-1987)
DO -
UR -
PB -
CY - Japan
PY - 1974
DA - 1974-09-01
LA - Japanese
J2 - Okayama Daigaku Nogakubu Gakujutsu Hokoku; (Japan)
C1 -
C2 -
ER -