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Mark Waghorn

Rising Ozone Levels Harm Pollination

Air pollution is preventing insects from sniffing out the crops and wildflowers that depend on them, according to new research.

Bees and butterflies pollinate plants when they go from flower to flower – boosting reproduction. This process has been interrupted by rising levels of ozone, impacting the survival of both fauna and flora.

Lead author Professor Evgenios Agathokleous, of Nanjing University of Information Science & Technology in China, said: “There is much noise about the direct effects of agrochemicals on pollinators, a subject of profound societal attention. But it now emerges that ozone is a silent threat to pollinators and thus pollination. These impacts of ozone have long been missed.”

A Bee pollinates a thistle on a show garden at Chelsea Flower Show on May 23, 2022 in London, England. (Photo by Dan Kitwood/Getty Images)

Ozone forms naturally in the stratosphere 7.5 miles above sea level, and helps protect against harmful sun rays. But in the troposphere, the lowest region of the atmosphere, it damages Earth. The greenhouse gas is created by a photochemical reaction between volatile chemicals.

Levels have been increasing because a warming climate is creating optimal conditions for it to thrive.

Prof Agathokleous said: “Ozone pollution can affect the timing and duration of flowering in such a way the occurrence of flowering is asynchronous to the activities of pollinators.

“It can also change the color of flowers, disrupting the visual signals to pollinators. Ozone pollution can also directly react with pollen, decreasing its quality, but also indirectly changing the amount of pollen.”

The review in Trends in Ecology and Evolution also found that ozone pollutes plants almost instantly – leaving injury signs of diverse hues and shapes and discoloring leaves.

When damaged, they have a hard time photosynthesizing and struggle to provide the plant with the energy it needs to grow.

Plants emit their own organic volatile compounds to facilitate communication between them – and alerting pollinators to the presence of a waiting flower.

A White-tailed bumblebee, Bombus lucorum, collects nectar from lavendar on August 08, 2022 in Knutsford, England. (Photo by Christopher Furlong/Getty Images)

Ozone pollution appears to be disrupting these chemical signatures.

Prof Agathokleous added: “Changes in the composition of the volatile blends could also have severe implications to pollinators because they might not recognize host plants and their qualities in the same way they did in the past.

“Within plant tissues, ozone pollution could decrease the number of nutrients that are essential to insects, increase the abundance of chemicals that are harmful to insects ingesting them, and degrade the overall quality of plant tissues.”

A recent scientific review of insect numbers around the world suggested that 40% of species were undergoing “dramatic rates of decline.”

Bees, ants and beetles are disappearing eight times faster than mammals, birds or reptiles.

According to the World Health Organisation, air pollution accounts for an estimated 4.2 million deaths a year from stroke, heart disease, lung cancer and chronic respiratory diseases..

Produced in association with SWNS Talker.

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