Chill Out To Evolve

Species don’t evolve faster in warmer climes as had been thought; rather, it appears to be cooler, more temperate, regions that crank-up speciation rates (the process in which one species splits into two). This surprising conclusion has been drawn by University of British Columbia (UBC) researchers who have charted the genetic family tree of 618 mammal and bird species in the Americas over the last few million years.

“It’s been long established that the tropics have more species, but it’s not clear why,” said UBC zoologist Jason Weir. “The common assumption is that species simply evolve faster in warmer climates.” To better understand the evolutionary effects of temperature, Weir and mentor Prof. Dolph Schluter analyzed the DNA of species that are closely related to one another.

Their findings, appearing in Science, indicate that speciation takes place faster in temperate zones than in the tropics. “Our analysis shows that new species actually evolve faster as we move towards the poles. It would take one species in the tropics three to four million years to evolve into two distinct species, whereas at 60 degrees latitude, it could take as little as one million years,” said Weir.

But while cooler temperatures might increase speciation, they don’t necessarily mean more species, as the higher speciation rate is counteracted by a higher extinction rate. Weir speculates that this is likely due to more intense climate fluctuations.

“In comparison, even though there is a lower speciation rate in the tropics, the stable environment contributes to an equally low extinction rate. As a result, more species survive. This could help explain why there are more species in general in warmer climates,” explained Weir. “In other words, there’s a higher turnover of species in places like Canada, making it a hotbed of speciation, not the Amazon.”

Source: University of British Columbia

, ,

Comments are closed.

HOW TO AVOID A CLIMATE DISASTER Bill Gates GREAT RESET LUCIFERIAN AGENDA STICKER picture

HOW TO AVOID A CLIMATE DISASTER Bill Gates GREAT RESET LUCIFERIAN AGENDA STICKER

$99.99



NASA MSFC 1977 TECHNICAL MEMO 78118 TERRESTRIAL ENVIRONMENT (CLIMATIC) GUIDELINE picture

NASA MSFC 1977 TECHNICAL MEMO 78118 TERRESTRIAL ENVIRONMENT (CLIMATIC) GUIDELINE

$129.95



Vintage 1942 Quick Fact About Southern California Climate Travel Brochure picture

Vintage 1942 Quick Fact About Southern California Climate Travel Brochure

$23.39



1981 I Love Heart Dolphins Climate Change Environmental Greenpeace Protest Pin picture

1981 I Love Heart Dolphins Climate Change Environmental Greenpeace Protest Pin

$27.50



NEW Mobile Climate Control 13-4532 Air Cooler Unit NSN:4130-01-555-5153 picture

NEW Mobile Climate Control 13-4532 Air Cooler Unit NSN:4130-01-555-5153

$940.00



1930's/40's Vintage Pristine Cotton Material Mexican Inspired Pattern Cloth picture

1930's/40's Vintage Pristine Cotton Material Mexican Inspired Pattern Cloth

$16.99



ROUTE 55 ALL CLIMATE 10W40 MOTOR OIL QUART CARDBOARD CAN EMPTY Vintage SEALED picture

ROUTE 55 ALL CLIMATE 10W40 MOTOR OIL QUART CARDBOARD CAN EMPTY Vintage SEALED

$34.99



USMC 3 SEASONS SLEEPING BAG REGULAR TYPE 1 & BIVY COVER ALL CLIMATE SIZE 1 & 3 picture

USMC 3 SEASONS SLEEPING BAG REGULAR TYPE 1 & BIVY COVER ALL CLIMATE SIZE 1 & 3

$192.00



There is no Planet B BUMPER STICKER or MAGNET magnetic climate change ecology picture

There is no Planet B BUMPER STICKER or MAGNET magnetic climate change ecology

$3.49



Long Island Climate Study 1901 Le Grand Denslow Compliments Long Island Railroad picture

Long Island Climate Study 1901 Le Grand Denslow Compliments Long Island Railroad

$40.00



Powered by WordPress. Designed by WooThemes