Acid Rain Makes Meat-Eating Plants Go Vegetarian

Normally, we applaud efforts to reduce meat consumption. But in this case, it’s a little disturbing.

Scientists at Loughborough University discovered that acid rain is causing carnivorous plants to change their behavior and become vegetarian. Normally, these plants depend on living things that fall into their traps to provide nutrients necessary for survival. According to the study’s lead author Dr. Jonathan Millet, nitrogen pollution is supplying carnivorous plants on Swedish bogs with so many nutrients, they don’t need to eat as many flies.

To arrive at this conclusion, Millet examined drosera rotundifolia, otherwise known as the common sundew, which grows in rain-fed bogs across much of northern Europe. These habitats are nutrient-poor, so the plant needs to boost its nitrogen intake by trapping midges and other insects with its sticky leaves.

Unfortunately, humans’ increased use of fossil fuels means that there’s more nitrogen in the air, and eventually this acidic rain falls on the bogs. Millet’s study shows that this artificial rain of fertilizer is now making carnivorous plants lose interest in insect prey. He found that plants in lightly-polluted areas got 57 percent of their nitrogen from insects; in areas that receive more nitrogen deposition, that figure fell as low as 22 percent.

It’s taken millions of years for the common sundew to develop the ability to trap and consume living prey, so it’s shocking to see such a rapid change in behavior. Millet says previous research shows that the plants can control the stickiness of their leaves, as well as the color which helps them attract the insects in the first place. It may be that with so much nitrogen available in the ground, the plants are retracting the tools that helped them catch bugs in an effort to save energy.

Although it might seem like minor change in an insignificant plant species, such a change can have a big impact on the surrounding ecosystem.

“In the sites with more nitrogen deposition, these plants now get much more of their nitrogen from their roots, but they still have to bear the residual costs of being carnivorous, and other plants without these will be better able to survive,” said Millett. “So it’s quite likely we’ll see less abundance and perhaps local extinctions from carnivorous species. The individual plants get bigger and fitter, but the species as a whole is less well adapted to high-nitrogen environments and will lose out over time.”

Related Reading:

New Meat Eating Plant Discovered In Cambodia

6 Problems Caused By Shrinking Biodiversity

Bizarre Worm-Eating Plant Discovered In Brazil

Image via Thinkstock


Dale Overall

Plants becoming cannibalistic by eating other plants...intriguing said the spider to the fly. Come into my web.

And then there is one believing eating meat takes 20 per cent off one's life. I know a 91 year old who eats meat, pretty good life span wouldn't one think moving fairly well for his age.

Nothing wrong with meat if it is organic, same goes for veggies health wise both have less toxins than factory farming be it GMO veggies or sprayed with pesticides/meat pumped with hormones or antibiotics.

Everything seems to get into the vegan vs meat debate endlessly. Eat what you eat and leave your judgements about others out of it. Enjoy what you eat. Leave everyone else alone.

Acid rain is modern society. Head for the caves but hide from the bat guano, that is toxic too.

Plants eating plants...go figure.

With a lot of odd technical issues going on in Care2 many of these comments are a diversion to say the least!

Then there are some unrealistic ones blaming Harry Potter for the illegal trade in owls in India!

Victoria S.
Victoria S5 years ago

Interresting development... and people still claim mankind has no effect on the environment :-(

SuSanne P.
SuSanne P5 years ago

Thank you:)

Yvette S.
Yvette S5 years ago

Interesting! Thanks for sharing

Rachel De Klerk
Rachel De Klerk5 years ago

Well that's sad to hear, I kinda liked those cute little buggers that snap up when you tickle them...besides they are natural bug repellants! I hope with all this going on people will live greener lives.

Diane L.
Diane L5 years ago

Ahren, while I most certainly agree that global warming is a very big concern, Prince Charles is hardly anyone I'd listen to about that or any other subject. He's never shown much intelligence so why would anyone listen to a thing he has to say?

Debbie Bush
Debbie Bush5 years ago


Heather Marvin
Heather Marv5 years ago


Luisa Barr
Luisa Bar5 years ago


Carole R.
Carole R5 years ago

Thank you.