Pesticides: more toxic than previously thought?

Changes in personality of jumping spiders suggest effects of insecticide exposure may have been underestimated

A McGill research team reached this conclusion after looking at changes in the behaviour of individual Bronze Jumping Spiders both before and after exposure to Phosmet, a widely used broad spectrum insecticide. It is a finding with far-reaching implications for agricultural production and ecosystem health.

“Bronze jumping spiders play an important role in orchards and fields, especially at the beginning of the agricultural season, by eating many of the pests like the oblique-banded leafroller, a moth that attacks young plants and fruit,” says Raphaël Royauté, a former McGill PhD student whose study on the subject was published in Functional Ecology recently. “Farmers spray insecticides on the plants to get rid of these same pests, and it was thought that it had little significant effect on the spiders’ behaviours. But we now know that this isn’t the case.”

The researchers discovered this fact by focusing on the way that exposure to insecticide affected the behaviour of individual spiders, including things like their ability to leap on prey and their interest in exploring new territory, both of which are crucial to their survival and to their role in keeping down pests.

Spider personalities

“Most individuals have an individual signature in their behaviours, what scientist call “personality types”says Royauté. “Some individuals are willing to take risks when predators are present, explore new territories faster, or capture prey more quickly. But the effects of insecticides on personality types remains poorly described.”

The researchers found that, in general, the behaviour of spiders became more “unpredictable” and individuals behaved less according to their personality type once they were exposed to insecticide. This could be because some individuals are much more sensitive to the insecticide than others. Interestingly, they also found that male and female spiders were affected differently. Males who had been exposed to the insecticide were able to continue to capture prey as they had before, but “lost” their personality type when exploring their environment. Individual females, on the other hand, were much more affected in their ability to capture prey.

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