caa a22 4500 469098899 CHVBK 20180323133039.0 cr unu---uuuuu 170328e19920501xx s 000 0 eng 10.1007/BF00317185 doi (NATIONALLICENCE)springer-10.1007/BF00317185 Local variation in diapause characteristics of Tetranychus urticae Koch (Acarina: Tetranychidae) [Elektronische Daten] [Ping-Man So, Akio Takafuji] Summary: Diapause characteristics of nine local populations of Tetranychus urticae Koch (Acarina: Tetranychidae) occurring on rose in central Japan were investigated. The percentage of females that entered diapause at 18° C and 9L: 15D photoperiod ranged between 0 and 77%. In addition, both photoperiodic and temperature responses varied widely among these populations. We suggest that temperature response might be a better trait than photoperiodic response for selection among local populations. Females in diapause survived −24° C better than those that were not. However, no difference in cold hardiness among these populations was found. The mite responded rapidly to artificial selection for low and high diapause percentage. The response was asymmetrical, being easier in the direction of low diapause percentage. Reciprocal and back crosses using selected low and high diapause percentage cultures showed that the genetic control of diapause was complicated. Neither the "lowdiapause” nor the "high-diapause” trait dominated over the other. However, the "low-diapause” trait seemed to be stronger. The results of this study suggest that variation in diapause response is maintained by (1) adaptation to local environments and (2) the complexity of the genetics of diapause. Such variation may provide the genetic raw material for natural selection and is a prerequisite for the extension of ecological range. Springer-Verlag, 1992 Diapause nationallicence Genetic variation nationallicence Photoperiodic response nationallicence Temperature response nationallicence Tetranychus urticae nationallicence So Ping-Man Entomological Laboratory, College of Agriculture, Kyoto University, 606, Kyoto, Japan aut Takafuji Akio Entomological Laboratory, College of Agriculture, Kyoto University, 606, Kyoto, Japan aut Oecologia Springer-Verlag 90/2(1992-05-01), 270-275 0029-8549 90:2<270 1992 90 442 https://doi.org/10.1007/BF00317185 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317185 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- So Ping-Man Entomological Laboratory, College of Agriculture, Kyoto University, 606, Kyoto, Japan aut NATIONALLICENCE 700 1- Takafuji Akio Entomological Laboratory, College of Agriculture, Kyoto University, 606, Kyoto, Japan aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 90/2(1992-05-01), 270-275 0029-8549 90:2<270 1992 90 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer