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Sarat Chandra Yenisetti,Sreedhara Narayana Hegde,Mididoddi Venkateswarlu,Mysoru Siddaiah Krishna 한국유전학회 2006 Genes & Genomics Vol.28 No.4
Phenotypic plasticity is the capability of a genotype to produce different phenotypes in different environments. The effects of changes in ambient temperature on reproductive fitness traits such as mating latency, copulation duration and mating success were studied in the Mysore and Ahmedabad populations of Phorticella striata at four ambient temperatures: - 15℃, 22℃, 29℃ and 36℃. Between the two populations the difference in mating latency was insignificant. However, the difference in copulation duration was significant between the two strains. The differences in mating latency and copulation duration at the four temperatures were also significant. Both populations exhibited long mating latency and short copulation duration at 15℃ and short mating latency, long copulation duration at 22℃ and 29℃. At 36℃ flies did not mate at all. The greatest mating success (%) was observed at 22℃ in both the Mysore and Ahmedabad populations. At 15℃, and 29℃ mating success was low. Chi-square test showed that the difference in mating success between the two populations was insignificant at different temperatures. Mating latency, copulation duration and mating success are independent events in the sexual process. These traits need not be expressed similarly by the same species under different situations. Thus, the present study heralds the phenotypic plasticity of sexual behavioral traits under various ambient temperatures. Our findings strengthen the support for the adaptive nature of temperature - mediated plasticity in sexual behavior.
Effect of Mating Delay and Mating Duration on Reproductive Performance of Antheraea mylitta
Rath, S. S.,Narain, Raj,Singh, M. K.,Suryanarayana, N. Korean Society of Sericultural Science 2007 International Journal of Industrial Entomology Vol.14 No.2
Tropical tasar silkmoth Antheraea mylilta D. is an economically important insect. The wild nature and above all unsynchronized emergence of moths lead to impairment in reproductive activity. The mating in moths is low (64%-70%), leaving about 30-36% of potential females unused for seed (= egg) production. Delay in mating adversely affects the reproductive performance such as mating behaviour, fecundity and fertility. Females are more severely affected by mating delay than males. Therefore, a study was under taken to develop a method to overcome the problem so that the production of layings can be increased to meet the ever increasing demand. It was revealed from the study that out of 16 possible age combinations (from the age groups of day 0 to day 3), female and male of day 0 (4-8 hours old) excel in their reproductive performance than others (with 94.4% mating success, 284 fecundity and 91.5% hatching). Reproductive performance declined significantly even if one of the parents was older. When either of the mating pair was 1 day old, the mating declined by 28%; fecundity by 32.8%; and hatching by 40.8%. The insemination of eupyrene sperm was declined by 35.2% when both the parents are 1 day old. Mating duration of 8 hours resulted in insemination of $8.3{\times}10^5$ eupyrene sperms, which was declined by 31.6%, 48% and 55% upon lowering of mating duration to 6 hr, 4 hr and 2 hr were maintained respectively.
( Kunal Sarkar ),( Manmatha Mandal ),( Shanmugam Manthira Moorthy ) 한국잠사학회 2009 International Journal of Industrial Entomology Vol.19 No.2
The effect of mating duration and multiple use of male on fecundity and fertility was investigated in the hybrids of Silkworm, Bombyx mori L. One hour to five hours of mating duration did not affect egg laying (fecundity) significantly, while fertilization affected significantly. Below 50% fertility was noticed when mating duration was reduced to below two hours. Similarly multiple use of male caused significant reduction in fertility but not fecundity. Till fourth mating no significant reduction in fertility was observed, thereafter fertility reduced considerably.
Sarkar, Kunal,Mandal, Manmatha,Moorthy, Shanmugam Manthira Korean Society of Sericultural Science 2009 International Journal of Industrial Entomology Vol.19 No.2
The effect of mating duration and multiple use of male on fecundity and fertility was investigated in the hybrids of Silkworm, Bombyx mori L. One hour to five hours of mating duration did not affect egg laying (fecundity) significantly, while fertilization affected significantly. Below 50% fertility was noticed when mating duration was reduced to below two hours. Similarly multiple use of male caused significant reduction in fertility but not fecundity. Till fourth mating no significant reduction in fertility was observed, thereafter fertility reduced considerably.
Thao Thi Phuong Nguyen,Hiroshi Amano 한국응용곤충학회 2009 Journal of Asia-Pacific Entomology Vol.12 No.4
Effects of constant temperature on mating duration and total fecundity of Neoseiulus californicus females mated once were investigated at 18 °C, 25 °C, 30 °C, and 35 °C with a photoperiod of 16L:8D. Adult mites grown and maintained at 25 °C mated for 315.3 min on average and produced 46.1 eggs per female. These values varied significantly by temperature: 553.6 and 13.9 (18 °C), 261.2 and 26.6 (30 °C), and 253.6 and 23.9 (35 °C), respectively. Duration of copulation was negatively correlated with temperature. However, total egg production peaked at 25 °C and decreased at lower and higher temperatures. Reduced sperm transfer and/or survival rate of sperm in the female body may account for decreased egg production when temperatures are not optimal. Effects of constant temperature on mating duration and total fecundity of Neoseiulus californicus females mated once were investigated at 18 °C, 25 °C, 30 °C, and 35 °C with a photoperiod of 16L:8D. Adult mites grown and maintained at 25 °C mated for 315.3 min on average and produced 46.1 eggs per female. These values varied significantly by temperature: 553.6 and 13.9 (18 °C), 261.2 and 26.6 (30 °C), and 253.6 and 23.9 (35 °C), respectively. Duration of copulation was negatively correlated with temperature. However, total egg production peaked at 25 °C and decreased at lower and higher temperatures. Reduced sperm transfer and/or survival rate of sperm in the female body may account for decreased egg production when temperatures are not optimal.
Thao T.P. Nguyen,,Hiroshi Amano 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.1
A series of experiments was conducted to investigate whether temperatures of 18 °C, 25 °C, 30 °C, and 35 °C and a photoperiod of 16L:8D at immature and adult stages would differentially affect the mating duration and egg production of Neoseiulus californicus females mated once. Mating duration was strictly determined by ambient temperature at the time of mating, regardless of the temperatures under which they were raised. Compared with a consistent 25 °C condition, total fecundity of females decreased when temperature conditions of 18 °C, 30 °C, and 35 °C were applied during any life stage (immature, mating, and oviposition periods) or a combination of different stages. In general, however, if mites were raised in conditions of ≤25 °C, and mated and oviposited at conditions of ≥25 °C, total egg production was relatively high. Based on these results, the adaptation of mites to thermal environments was discussed.
Remating in a Drosophilid : Phorticella striata
Yenisetti, Sharat Chandra,Hegde, Shridhar Narayan 한국유전학회 2002 Genes & Genomics Vol.24 No.2
Remating is common in males and females of many species of Drosophila. Reproductive success in male organisms is limited by the number of females he can inseminate and the ability to produce more eggs in case of females. The phenomenon of remating by females is a prerequisite for the occurrence of sperm competition between males. Phorticella striata is a drosophilid insect discovered from Karnataka, India. Male and female remating were observed in two mass culture stocks raised from flies collected from Mysore and Ahmadabad. Study revealed that in male Phorticella variation in remating frequency, mean matings between two populations was insignificant. Variation in mating durations for different matings in both the strains was also insignificant. However, significant inter-strain mating duration variations for the first four coatings were observed. Variation in female remating latency between the populations was found statistically insignificant. Insignificant variation was observed for the duration of copulation between the first and second matings in Mysore population. However, remating duration was significantly shorter in Ahmadabad population. Observed inter-strain variations can be attributed to geographic isolation which may lead to 'response variation' of the genetic system of a species to different physical environments.