CO2 anesthesia on Drosophila survival in aging research

Protocol for recording and analyzing spontaneous locomotion in Drosophila

The quantitative analysis of locomotion is used to study many biological processes. Here, we describe how to record the locomotion of up to 50 Drosophila individuals and process the resulting video files using FlyTracker. We detail the use of modifiable MatLab scripts to process structure array files generated by FlyTracker. We have applied this to study Drosophila movement during aging, but it could be used to address a variety of research questions. For complete details on the use and execution of this protocol, please refer to Barwell et al. (2021).¹.

The deleterious effects of old social partners on Drosophila lifespan and stress resistance

Social interactions play important roles in the modulation of behavior, physiology, and, potentially, lifespan. Although longevity has been studied extensively in different model organisms, due to the complexity of social environments, the social modulation of aging remains poorly investigated. The present study used the fruit fly, Drosophila melanogaster, as a model to study lifespan and stress resistance under different social conditions. Our experiments first showed that social isolation increased fly lifespan, suggesting a potential deleterious effect of social companions. Furthermore, we exposed flies to different aged social partners and found that living with old animals significantly reduced lifespan and stress resistance in young animals. In contrast, living with young animals increased old animal lifespan, although the effects were less robust. Overall, our results suggest that while social interaction can influence fly health, specific social partners may have more pronounced effects than others. This study provides new evidence that different social environments have significant impacts on animal physiology and longevity.

Honey Bees and Humane Euthanasia

Euthanasia of animals is a cornerstone of veterinary medicine. Currently, no official criteria are set for the euthanasia or dispatch of a honey bee colony. Many methods are used around the world and vary with regards to technique, materials, volume of agent used, and timing. Each method described has its own level of effectiveness, safety, and humaneness. Although current, commonly used, methodologies may not meet the criteria of humane euthanasia, veterinarians can still apply the professional standard to other key aspects of the act of euthanasia.