Nature and Biodiversity

Air pollution is making it harder for pollinators to find food - here's why it matters

Pollinators play a huge role in community ecology

Pollinators play a huge role in community ecology. Image: Pexels/Pixabay

Paige Bennett
Writer, EcoWatch
Share:
Our Impact
What's the World Economic Forum doing to accelerate action on Nature and Biodiversity?
The Big Picture
Explore and monitor how Nature and Biodiversity is affecting economies, industries and global issues
A hand holding a looking glass by a lake
Crowdsource Innovation
Get involved with our crowdsourced digital platform to deliver impact at scale
Stay up to date:

Nature and Biodiversity

This article is part of: Centre for Nature and Climate
  • A new scientific study has revealed that the chemicals in air pollution may be disrupting plant reproduction
  • Nitrate radicals (NO3) and ozone pollutants, common byproducts of car exhaust and burning fossil fuels, make it harder for pollinators, like moths, to find flowering plants.
  • The authors warn that pollinators are critical for plant health, food systems and food security.

A new study has revealed that the chemicals in air pollution may be disrupting plant reproduction, as the pollutants mask the scent of flowering plants and make them more difficult for pollinators to find.

The study, published in the journal Science, showed how nitrate radicals (NO3), which can form from combustion in gas-fueled vehicles and coal and gas power plants, and ozone pollutants can degrade the natural chemical scents of flowers.

Discover

What's the World Economic Forum doing to tackle air pollution?

“When you smell a rose, you’re smelling a diverse bouquet composed of different types of chemicals,” Jeff Riffell, a co-lead author of the study and biology professor at the University of Washington, explained in a statement. “The same is true for almost any flower. Each has its own scent made up of a specific chemical recipe.”

Researchers analyzed the scent samples from evening primrose flowers, then observed how each natural chemical in the flowers’ scents reacted with the pollutants in wind tunnels and field experiments. The researchers found that the nitrate radicals masked certain chemicals, including monoterpenes, which are particularly attractive to moths.

While both nitrate radicals and ozone pollutants had an effect on the flowers’ scents, nitrate radicals had a bigger impact on the monoterpenes that moths rely on to find and pollinate flowers.

The researchers found that in the wind tunnel experiments, tobacco hawkmoths were 50% less accurate in locating the flowers, and white-lined sphinx moths weren’t able to find the flowers at all. In the field experiments, moths had up to a 70% decline in accuracy of finding the flower sources when nitrate radicals were introduced.

“The NO3 is really reducing a flower’s ‘reach’ — how far its scent can travel and attract a pollinator before it gets broken down and is undetectable,” Riffell explained.

According to the researchers, primroses could experience more difficulty in producing seeds, by about 28%, because of the inability of moths to find the flowers, Popular Science reported. This estimate applied only to the affect of the disruption to moths pollinating primroses, so negative implications could be more widespread.

Have you read?

“Pollinators play a huge role in community ecology; they’re critical for the fitness of plants. If you affect that, then you’re going to have ecosystem-wide impacts,” Riffell told Popular Science. “Pollinators are also critical for our food system and food security.”

In January, scientists published a separate study on the potential impacts of air pollution on insect pollination. That study similarly noted how air pollutants can hinder floral scents as well as visual cues, such as plant petal size and potentially color.

The growing research on how air pollutants impact pollinators and plants highlights the urgency of reducing human-caused pollution. According to the Center for Biological Diversity, 40% of global insect pollinators are endangered. If pollutants are altering the insects’ ability to find plants, it further threatens the pollinators and the plants’ reproduction.

Don't miss any update on this topic

Create a free account and access your personalized content collection with our latest publications and analyses.

Sign up for free

License and Republishing

World Economic Forum articles may be republished in accordance with the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License, and in accordance with our Terms of Use.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Related topics:
Nature and BiodiversityFuture of the Environment
Share:
World Economic Forum logo
Global Agenda

The Agenda Weekly

A weekly update of the most important issues driving the global agenda

Subscribe today

You can unsubscribe at any time using the link in our emails. For more details, review our privacy policy.

From reserves to revenue: How marine protected areas can drive economic growth

Mark John Costello

April 8, 2024

1:19

About Us

Events

Media

Partners & Members

  • Join Us

Language Editions

Privacy Policy & Terms of Service

© 2024 World Economic Forum