Humans reshaping evolutionary history of species around the globe: paper

University of British Columbia researcher had the paper published in the Proceedings of the Royal Society

Swallows are evolving smaller, more manoeuvrable wings to help them dodge buildings and vehicles.

Some fish are growing mouths that are smaller and harder to hook.

Large animals from caribou to tuna are disappearing.

Meanwhile, it’s boom time for anything not too fussy about where it lives or what it eats.

“It’s a reshaping of the tree of life,” said Sarah Otto, a University of British Columbia researcher, whose paper was published Wednesday by the London-based Proceedings of the Royal Society.

Otto, a much-awarded and highly regarded theoretical biologist, says the activities and presence of human beings have become one of the largest drivers of evolutionary change everywhere on the planet.

RELATED: Sounding the climate change alarm bell

“Human impacts on the world are not just local,” she said. ”They are changing the course of evolutionary history for all species on the planet, and that’s a remarkable concept to ponder.”

Earth scientists have long discussed the idea of the Anthropocene — a period of Earth’s history defined by geological markers of human impact. Otto, after reviewing dozens of research papers, concludes the planet’s biology is becoming similarly marked as plants and animals respond to human pressure.

Her paper is replete with examples from bird species slowly forgetting to migrate to mosquito breeds adapted specifically to underground subway tunnels.

Backyard bird feeders are behind changes in the beak shape and strength of house finches. Different mammals are becoming nocturnal as a way to avoid human conflict. Introduced species change the ground rules for native plants and animals.

It’s a mistake to think evolution requires millennia, said Otto.

“Evolution happens really fast if the selection regimes are strong. We can see sometimes in plant populations evolutionary change in the course of years.”

If the changes come too fast for evolution to keep up, there’s always extinction.

Rates of species loss are now estimated to be 1,000 times higher than they were before human domination. More than one in five of all plant and animal species are considered at risk.

Extinctions have always happened. But Otto said they’re happening at such a pace and in response to such similar pressures that they are reducing the ability of evolution to respond to change.

“We’re losing the ability for evolution to bounce back.”

Forcing species into a human-formed box reduces variability, leaving evolution less to work with in response to future changes. And wiping species out removes them forever.

“If we’re eliminating the large-bodied mammals, even if humans went extinct on the planet, we’re not going to see an immediate return of ecosystems to have the right balance of small, medium and large species,” Otto said.

“We’re cutting off options. We’re cutting off options both within species by eliminating variability, and we’re also cutting off options at the tree of life level by cutting off species.”

Species that are doing well are generalists — crows, coyotes, dandelions.

RELATED: Ignoring climate change poses potential catastrophe for B.C.

“The ones that can both tolerate and thrive in human-altered environments,” said Otto. “The pigeons and the rats.”

The biggest single human-caused evolutionary pressure, Otto said, is climate change.

“The No. 1 thing we have to do is tackle climate change. If we don’t do that, we’re going to lose a lot more species.”

The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

Radium accommodators seek ban on short term rentals

Radium council continues considering how to regulate short term rentals.

Fire claims Fairmont home

Unsuspecting owner opens door on blaze.

First presumptive case of coronavirus identified in the Interior Health region

The woman, in her 30s, travelled from Shanghai and lives in the interior

Robbery with a hammer at Invermere Dairy Queen

Robber makes off with undisclosed amount of cash.

VIDEO: 2020 BC Winter Games wrap up in Fort St. John as torch passes to Maple Ridge

More than 1,000 athletes competed in the 2020 BC Winter Games

Still six cases of COVID-19 in B.C. despite reports of Air Canada passenger: ministry

Health ministry wouldn’t comment on specific flight routes

Violent ends to past Indigenous protests haunt Trudeau government

Trudeau adopted a more assertive tone Friday, insisting the barricade must come down

HIGHLIGHTS: Day one and two at the 2020 BC Winter Games

Athletes had sunny – but cold – weather to work with in Fort St. John

B.C. money laundering inquiry to begin amid hopes for answers, accountability

Eby argued that most B.C. residents already know the previous government, at best, turned a blind eye

Blockades remain in place as Wet’suwet’en hereditary chiefs returning to B.C.

Hereditary Chief Woos said they are ready to engage in nation-to-nation talks with the B.C.

Tyler Toffoli scores twice, Canucks crush Bruins 9-3

Stecher, Miller each add three points for Vancouver

Most Read