Effects on Life‐History Traits of Hypogastrura viatica (Collembola) Exposed to Imidacloprid Through Soil or Diet

Abstract

Collembola (springtails) are important members of soil communities worldwide by contributing to degradation of organic matter. In nature, Collembola might be exposed to the neonicotinoid insecticide imidacloprid, which is fairly persistent in soil. We exposed the widespread Hypogastrura viatica to imidacloprid through soil or food, and monitored the animals during exposure and a post-exposure period. We recorded effects on life-history traits affecting individual fitness; that is, mortality, behavioral activity, several reproduction traits, and moulting frequency.Exposure through soil led to a concentration-dependent mortality, while the mortality from dietary exposure possibly reflected reduced feeding activity. The body burden of This article is protected by copyright. All rights reserved. Accepted Articleimidacloprid in the Collembola did not differ between treatments. We found no sign of recovery in behavioral activity following exposure in neither experiment. The egg production of H. viatica was not significantly affected by imidacloprid at 0.01 mg/kg dry soil, but showed a tendency to reduce number of eggs per batch and reduced hatching success. At higher concentrations, the reproduction was close to, or completely stopped. The moulting frequency decreased during exposure, while in the post-exposure period, we saw milder effects in the highest concentrations, suggesting elimination through moulting or reduced toxic response due to reduced feeding activity. Overall, H. viatica was more sensitive to imidacloprid than previously studied Collembola, which highlights the importance of considering species sensitivities when risk assessing soil environments.

Responses of Soil Collembolans to Land Degradation in a Black Soil Region in China

“…We found that different soil environmental variables were correlated with each genus of soil Collembolans in numerous ways, and this confirmed our hypothesis that responses to land degradation would differ across the soil Collembolan taxa (H2). Previous studies revealed that life histories, feeding guilds, propagation characteristics and adaptability mechanisms differed dramatically across soil Collembolan taxa [ 40 , 41 , 42 ]. Consequently, in this study, a variety of responses to land degradation were observed across the different genera of soil Collembolans.…”

A Reaction-Diffusion Model with Spatially Inhomogeneous Delays

“…Then T (t) : X → X is a C 0 semigroup generated by the operator A defined on D(A). Define F : X → X by (9) for x ∈ Ω and φ ∈ X . Then (7) can be rewritten into the following abstract differential equation…”

“…Following are typical motivative scenarios to incorporate spatially varying feedback delays in a model system. The first example is the development of Collembola, with its egg development and hatching being affected by environmental pollution, such as copper lead, zinc [ 31 ] and other toxic substances [ 9 ]. However, these toxic substances are not evenly distributed in soil [ 9 ], which induces a non-uniform development time in the spatial scale.…”

“…The first example is the development of Collembola, with its egg development and hatching being affected by environmental pollution, such as copper lead, zinc [ 31 ] and other toxic substances [ 9 ]. However, these toxic substances are not evenly distributed in soil [ 9 ], which induces a non-uniform development time in the spatial scale. Another example is the spatially varying maturation duration in tick development across different spatial patches driven by patch-specific environmental conditions [ 29 ].…”

Using dietary exposure to determine sub-lethal effects from imidacloprid in two springtail (Collembola) species

“…Field concentrations of imidacloprid (Silva et al 2019 ) can cause negative effects for non-target, soil-living arthropods (de Lima e Silva. et al 2017 ; van Gestel et al 2017 ; Kristiansen et al 2021 ). One such group is the Collembola (springtails), which are important members of the soil fauna (Rusek 1998 ), and among the soil animals that are most sensitive to pesticides originating from agriculture (Joimel et al 2022 ), such as neonicotinoids.…”