Effect of tadpole shrimp, Triops longicaudatus, (Notostraca: Triopsidae), on the efficacy of the microbial control agent Bacillus thuringiensis var. israelensis in experimental microcosms.

Type

Article

Date of Publication

1996

Original Publication

Journal of the American Mosquito Control Association

Volume

12

Series / Issue

Issue: 1

Pages

033-038

Contributed by

American Mosquito Control Association

Notes

Author(s) - Fry-O'Brien LL.Mulla MS.

 

Abstract

Laboratory bioassays using Culex quinquefasciatus larvae evaluated the effect of tadpole shrimp on the persistence of Bacillus thuringiensis var. israelensis (B.t.i.) in water collected from the surface of field microcosms. Time elapsed since B.t.i. treatment, as well as presence or absence of soil and tadpole shrimp, affected B.t.i. persistence at the water surface in 15- and 30-cm total depths. The presence of tadpole shrimp slowed the natural decline in B.t.i. effectiveness over time, but this effect was depressed when soil was present. Tadpole shrimp foraged throughout the water column and stirred up the substrate, keeping more particles in suspension at the surface than in microcosms with no shrimp, in microcosms with water depths of 15 and 30 cm.

Notes

Author(s) - Fry-O'Brien LL.Mulla MS.