Laboratory studies of factors affecting egg hatch of triops longicaudatus (LeConte) (Notostraca : Triopsidae) |
| |
Authors: | Stephen R. Scott Albert A. Grigarick |
| |
Affiliation: | (1) California Department of Food & Agriculture, Dutch Elm Disease Project, 94303 Palo Alto;(2) Department of Entomology, University of California, 95616 Davis |
| |
Abstract: | Egg hatch was greatest (78.33%) for eggs not previously desiccated. A reduction in numbers hatched occurred as the relative humidity at which they were dried decreased. Some eggs hatched (0.67–79.33%) at pH levels of 3.10–10.01 with the highest hatch at pH 5.60. Water temperature greatly affected egg hatch. No hatch occurred until temperatures were above 14°C. A constant 29°C significantly inhibited hatching. Egg hatch increased 13.00 to 43.42% as salinity decreased from 2200 to 9.24 micromhos/cm. As little as 13 mm of flooded soil covering the eggs prevented them from hatching for 14 days. Eighteen percent hatch resulted when soil and eggs were redistributed to a 1 mm soil layer. Egg samples from the same parent, even though treated similarly, often hatched at greatly varying rates and only rarely was hatching 100% within a replication. |
| |
Keywords: | Triops longicaudatus Notostraca California rice field egg hatch desiccation pH temperature salinity soil corer |
本文献已被 SpringerLink 等数据库收录! |