Featured Research

from universities, journals, and other organizations

Tarsiers' bulging eyes shed light on evolution of human vision

Date:
March 27, 2013
Source:
Dartmouth College
Summary:
After eons of wandering in the dark, primates developed highly acute, three-color vision that permitted them to shift to daytime living, a new study suggests. The findings challenge the prevailing view that trichromatic color vision, a hallmark of primate evolution, evolved only after they started getting up with the sun, a shift that gave rise to anthropoid (higher) primates, which, in turn, gave rise to the human lineage.

In a genetic study of tarsiers' eyes, Dartmouth researchers suggest that primates developed highly acute, three-color vision that permitted them to shift to daytime living.
Credit: Image courtesy of Dartmouth College

After eons of wandering in the dark, primates developed highly acute, three-color vision that permitted them to shift to daytime living, a new Dartmouth College study suggests.

The findings challenge the prevailing view that trichromatic color vision, a hallmark of primate evolution, evolved only after they started getting up with the sun, a shift that gave rise to anthropoid (higher) primates, which, in turn, gave rise to the human lineage. The results are published in the journal Proceedings of the Royal Society B: Biological Sciences.

The authors based their findings on a genetic study of tarsiers, the enigmatic elfin primate that branched off early on from monkeys, apes and humans. Tarsiers have a number of unusual traits -- from their ability to communicate in the pure ultrasound to their iconic bulging eyes. Such sensory specializations have long fueled debate on the adaptive origins of anthropoid primates.

Dartmouth researchers who discovered the tarsiers' ultrasound vocalizations in a study last year said their new study sheds light on why the nocturnal critter's ancestors had enhanced color vision better suited for daytime conditions like their anthropoid cousins.

The authors analyzed the genes that encode photopigments in the eye to show that the last common ancestor of living tarsiers had highly acute, three-color vision much like living monkeys and apes. This finding would normally indicate a daytime lifestyle, but the tarsier fossil record showing enlarged eyes suggests they were active mainly at night.

These contradictory lines of evidence led the authors to suggest that early tarsiers were instead adapted to dim light levels, such as twilight or bright moonlight. These light conditions were dark enough to favor large eyes but still bright enough to support trichromatic color vision.

The authors said such keen-sightedness may have helped higher primates to carve out a fully daytime niche, which allowed them to better see prey, predators and fellow primates and to expand their territory in a world no longer limited to the shadows.


Story Source:

The above story is based on materials provided by Dartmouth College. Note: Materials may be edited for content and length.


Journal Reference:

  1. A. D. Melin, Y. Matsushita, G. L. Moritz, N. J. Dominy, S. Kawamura. Inferred L/M cone opsin polymorphism of ancestral tarsiers sheds dim light on the origin of anthropoid primates. Proceedings of the Royal Society B: Biological Sciences, 2013; 280 (1759): 20130189 DOI: 10.1098/rspb.2013.0189

Cite This Page:

Dartmouth College. "Tarsiers' bulging eyes shed light on evolution of human vision." ScienceDaily. ScienceDaily, 27 March 2013. <www.sciencedaily.com/releases/2013/03/130327132537.htm>.
Dartmouth College. (2013, March 27). Tarsiers' bulging eyes shed light on evolution of human vision. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2013/03/130327132537.htm
Dartmouth College. "Tarsiers' bulging eyes shed light on evolution of human vision." ScienceDaily. www.sciencedaily.com/releases/2013/03/130327132537.htm (accessed July 30, 2014).

Share This




More Plants & Animals News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Otters Enjoy Water Slides at Japan Zoo

Raw: Otters Enjoy Water Slides at Japan Zoo

AP (July 30, 2014) River otters were hitting the water slides to beat the summer heatwave on Wednesday at Ichikawa City's Zoological and Botanical Garden. (July 30) Video provided by AP
Powered by NewsLook.com
In Virginia, the Rise of a New Space Coast

In Virginia, the Rise of a New Space Coast

AP (July 30, 2014) Every summer, tourists make the pilgrimage to Chincoteague Island, Va. to see wild ponies cross the Assateague Channel. But, it's the rockets sending to supplies to the International Space Station that are making this a year-round destination. (July 30) Video provided by AP
Powered by NewsLook.com
Rodents Rampant in Gardens Around Louvre

Rodents Rampant in Gardens Around Louvre

AP (July 29, 2014) Food scraps and other items left on the grounds by picnickers brings unwelcome visitors to the grounds of the world famous and popular Louvre Museum in Paris. (July 29) Video provided by AP
Powered by NewsLook.com
Jane Goodall Warns Great Apes Face Extinction

Jane Goodall Warns Great Apes Face Extinction

AFP (July 29, 2014) The world's great apes face extinction within decades, renowned chimpanzee expert Jane Goodall warned Tuesday in a call to arms to ensure man's closest relatives are not wiped out. Duration: 00:58 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins