title: Effects of the Ionic Composition and Water Potential of Aqueous Solution on the Activity and Survival of Orrina phyllobia.
abstract: The activity and survival of Orrina phyllobia fourth-stage juveniles (J4) were examined in aqueous solutions representing 96 combinations of eight predominant soil solution ions at total concentrations of 100, 200, and 1,000 meq/liter. Various water potentials were imposed by the addition of mannitol or polyethylene glycol to ionic solutions. Nematode longevity increased as water potential was decreased. Longevity was approximately doubled at a water potential of -23 x 10 Pa and more than tripled at -60 x 10 Pa. No combination oflons at 200 meq/liter was lethal after a 6-day exposure. Several ion combinations significantly increased longevity at -10 and -23 x 10 Pa. Single cation Na solutions consistently inhibited activity and more than doubled nematode longevity.
authors.forename: A F
authors.initials: AF
authors.lastname: Robinson
authors.forename: C C
authors.initials: CC
authors.lastname: Orr
authors.forename: C E
authors.initials: CE
authors.lastname: Heintz