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Moths are less attracted to light than they used to be -- Part 2

(continuing discussion of the Battles et al. journal article)

In 25 years of monitoring in Delaware starting in 1998, light-trap catch averages declined from about half as many moths as pheromone traps in the first 5 years to less than 5% as many moths by the end of the period. A similar pattern was observed over a shorter 10-year period of sampling in New Jersey. On the other hand, a 15-year period of sampling in Minnesota showed no difference in the efficacy of the two trapping methods.

The causes of this decline in light trap efficacy are uncertain. Competition from light sources in the area is one possibility, but the data on competing light sources is poor and no statistically significant results are found. The researchers speculate that the more likely cause is that rapid evolution has decreased the flight-to-light response of this species. The paper notes that the Corn Earworm seems particularly susceptible to rapid evolutionary change as it has multiple ...more ↓

Posted on April 24, 2024 11:53 PM by amacnaughton amacnaughton | 2 comments | Leave a comment
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This project collects observations of moths in Ontario for the the Toronto Entomologists' Association. The TEA has been collecting observations in the province since 1970 and recently launched the Ontario Moth Atlas of moth phenology and ...more ↓

dkaposi created this project on August 05, 2016
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