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• W181635210 abstract "1. Two populations of D. siricidicoZa and one of D. rudyiwhich had been maintained continuously in monoxenic culture for 1 year (D. siricidicoZa (S), D. rudyi (T)) and 6 years(D. siricidicoZa (H)) were used to study the effects of a rangeof environmental conditions on the egg phase of the free-livingform of DeZadenus.2. For each population the rate of egg development increased0 0 with tempera.ture from 5 C to 25 C.3. The abortion rate of each population was related totemperature but the nature of the relationship varied from onepopulation to the next. In each case, abortion rate was lowest4. There were no significant differences in the relationshipsof abortion rate and eclosion failure to temperature.5. Examination of the effects of pH on the rate of eggdevelopment was inconclusive.6. Abortion rate varied with pH from pH 2·5 to pH 8•0.Different reactions were recorded for each population. OptimumpH was about pH 5·5 for D. siricidicoZa (H) and D. rudyi (T),about pH 5 • 0 for D. siricidicoZa (S).7. i'i.thin each population, abortion rate and eclosion failurefollm.;reC. a similar pattern of change with pH.8. Considerable variati.on occurred between replicates in theestimation of fecundity but, on the average, D. siricidiaoZa (S)were more fecund than D. siricidico Za (H). D. rudyi (T) weremore fecund when cultured on CMA rather than !t; PDA.- IV -9. The mean volume of the eggs of D. siricidicoZa (H) wassignificantly greater than that of D. siricidicoZa (S) which wasalso significantly greater than that of D. ruayi (T).10. The variance of egg volume of D. rudyi (T) was considerablyless than that of either of the D. sirvicidicoZa populations forwhich the variances were not significantly different.11. There was no correlation between the variance of the eggvolume of these populations and the time interval between hatchingof the first and last eggs.12. Cross-breeding trials conducted with seven species ofDeZadenus produced a wide range of results; from the parent femaledepositing only few eggs, all of which were abortive, to completelyunimpeded production of the Fz generat:ton.13. With only one exception, intraspecific crosses producedhybrids without reduced fecundity.14. Interspecific crosses sometimes resulted in reduced fecundityamong the parents and always among the hybrids produced.15. The crosses, D. ruayi (UJ7) x D. rudyi (T) and D. rudyi(UJ7) J1 x D. imperiaZis !f., produced aberrant results suggesting aclose relationship benveen D. rudyi and D. imperiaZis.16. Differences between D. siricidicoZa (H) and the other twopopulations indicated that considerable changes can result fromcontinuous cultures of the type used for DeZadenus.17. Differences between D. sirim:dicoZa (S) and D. siricidicoZa (H)inr:lic12te that the cultures of these populations should be regardedas differen': strains." @default.
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• W181635210 date "1974-01-01" @default.
• W181635210 modified "2023-09-27" @default.
• W181635210 title "A study of the free-living phase of Deladenus,nematodes parasitic in woodwasps" @default.
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