Moths are less attracted to light traps than they used to be
Date
2024-04-19
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Insect Conservation
Abstract
As evidence of global insect declines continues to mount, insect conservationists are becoming increasingly interested in modeling the demographic history of at-risk species from long-term survey data. However, certain entomological survey methods may be susceptible to temporal biases that will complicate these efforts. Entomological light traps, in particular, may catch fewer insects today than they once did due solely to increases in anthropogenic light pollution. Here we investigate this possibility by comparing the demographic histories of corn earworm moths (Helicoverpa zea) estimated from pairs of blacklight and pheromone traps monitored at the same farms. We find a stark decline in blacklight trap efficacy over 25 years of monitoring in Delaware, USA, mirrored over 10 years of monitoring in New Jersey, USA. While the precise causes of this decline remain a subject for discussion, the practical consequences are clear: insect conservationists cannot fully rely on long-term trends from entomological light traps.
Description
This article was originally published in Journal of Insect Conservation. The version of record is available at: https://doi.org/10.1007/s10841-024-00588-x. © The Author(s) 2024
Keywords
demographic history, sampling bias, artificial light at night, light trap, flight-to-light behavior, helicoverpa zea
Citation
Battles, I., Burkness, E., Crossley, M.S. et al. Moths are less attracted to light traps than they used to be. J Insect Conserv (2024). https://doi.org/10.1007/s10841-024-00588-x