Paily K P, Balaraman K
Vector Control Research Centre (1CMR), Indira Nagar, Pondicherry, India.
Indian J Malariol. 1993 Dec;30(4):221-5.
The oviposition pattern of Romanomermis iyengari (Nematoda: Mermithidae) in relation to the moisture level in the soil was studied by seeding postparasites into two sets of 12 cm soil columns. While one set of the soil column was allowed to dry over a period of 60 days, the other set was maintained at a constant level of 15-20% moisture throughout the soil column. In the soil column maintained at constant moisture level, the postparasites oviposited primarily in the upper 3 cm layer (80-97%). In the soil column which was allowed to dry the percentages of eggs laid in the upper 3 cm layer were 96, 24 and 6 respectively on D20, D30 and D40 after seeding and the moisture levels on respective days were 12, 5 and 3%. On corresponding days the postparasites laid 1, 56 and 42% of the eggs in the lower most layer (9-12 cm) and the moisture levels were respectively 15, 10 and 9%. The results indicate that the adult nematodes migrated towards the bottom layer of the soil and laid eggs as the moisture of the upper layers decreased.
通过将寄生后期线虫接种到两组12厘米长的土柱中，研究了伊氏罗索线虫（线虫纲：索科）的产卵模式与土壤湿度水平的关系。一组土柱在60天内任其干燥，另一组土柱在整个柱体中保持15 - 20%的恒定湿度水平。在保持恒定湿度水平的土柱中，寄生后期线虫主要在上层3厘米土层中产卵（80 - 97%）。在任其干燥的土柱中，接种后第20天、第30天和第40天在上层3厘米土层中产卵的百分比分别为96%、24%和6%，相应天数的湿度水平分别为12%、5%和3%。在相应的天数，寄生后期线虫在最下层（9 - 12厘米）产卵的比例分别为1%、56%和42%，湿度水平分别为15%、10%和9%。结果表明，随着上层土壤湿度降低，成年线虫向下层土壤迁移并产卵。
