Abstract
AbstractThe rate of loss of crickets (Acheta domestica L.), with and without the presence of an adventitious predator, the gray‐tailed vole (Microtus canicaudus), has been studied in Terrestrial Microcosm Chambers (TMC‐II) treated with pine stakes impregnated with creosote, bis(tri‐n‐butyltin)oxide (TBTO), dieldrin (HEOD), pentachlorophenol (PCP) or a toluene solvent control. The first‐order rate of cricket loss (‐k) increased only for HEOD, to a maximum at 33 d post‐treatment, with oscillations of about a 16‐d period. This result infers a “cricket‐available” compartment of HEOD and/or metabolites with concentrations that must be greater than those measured in air, soil, water or plants and other biota. When a gravid vole was subsequently added to each TMC, the predation index (Δkv) increased for control and PCP, but declined markedly for creosote and HEOD, and to a lesser extent for TBTO.
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