Related Experiment Video
Updated: May 13, 2026
06:00
Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory
Published on: July 10, 2018
Sublethal contaminant exposure alters behavior in a common insect: important implications for trophic transfer
Lorin A Neuman-Lee1, Gareth R Hopkins, Edmund D Brodie
1Department of Biology, Utah State University, Logan, Utah, USA. lorin215@gmail.com
Summary
Sub-lethal malathion exposure alters house cricket behavior, increasing predation risk. Male crickets showed more erratic movements and less shelter-seeking, with females appearing less affected by this pesticide.
Area of Science:
- Environmental toxicology
- Behavioral ecology
- Pesticide impact on invertebrates
Background:
- Malathion is a widely used organophosphate insecticide.
- Sub-lethal pesticide exposure can cause significant behavioral changes in non-target organisms.
- House crickets (Acheta domesticus) are a common model organism for behavioral studies.
Purpose of the Study:
- To investigate the behavioral effects of sub-lethal malathion exposure on house crickets.
- To determine if there are sex-specific differences in behavioral responses to malathion.
- To assess the potential ecological implications of observed behavioral changes.
Main Methods:
- Exposing male and female Acheta domesticus to increasing concentrations of malathion.
- Observing and quantifying behavioral parameters such as movement, grooming, and shelter-seeking.
- Comparing behavioral data between control and malathion-exposed groups, and between sexes.
Main Results:
- Increased non-directional movement (e.g., twitching, grooming) in male crickets with higher malathion concentrations.
- Increased directional movement and reduced shelter-seeking behavior in exposed male crickets.
- Female crickets exhibited less pronounced behavioral alterations compared to males, suggesting a sex-bias.
Conclusions:
- Sub-lethal malathion exposure significantly alters the behavior of male house crickets, potentially increasing their vulnerability to predation.
- Behavioral changes induced by malathion could have cascading ecological effects through altered predator-prey dynamics.
- A sex-specific difference in susceptibility to malathion's behavioral effects was observed in Acheta domesticus.
Related Concept Videos
01:23Toxicity Testing in Animals
Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
01:36Types of Toxins
Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
01:26Toxic Reactions: Overview
When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
01:27The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Periodic Table Provides Information...