Featured Research

from universities, journals, and other organizations

A snapshot of pupfish evolution

Date:
January 10, 2013
Source:
University of California Davis (UCD)
Summary:
One biologist has bred more than 3,000 hybrid fish in his time as a graduate student in evolution and ecology, a pursuit that has helped him create one of the most comprehensive snapshots of natural selection in the wild and demonstrated a key prediction in evolutionary biology. New research shows that San Salvadoran pupfish are evolving at an explosively faster rate than other pupfish.

The adaptive landscape shows how changing physical features, such as jaw shape, are related to survival.
Credit: Chris Martin/UC Davis Graphic

Chris Martin has bred more than 3,000 hybrid fish in his time as a graduate student in evolution and ecology at UC Davis, a pursuit that has helped him create one of the most comprehensive snapshots of natural selection in the wild and demonstrated a key prediction in evolutionary biology.

Related Articles


"We can see a surprisingly complex snapshot of natural selection driving the evolution of new specialized species," said Martin, who with Professor Peter Wainwright published a paper on the topic in the Jan. 11, 2013, issue of the journal Science.

The "adaptive landscape" is very important for evolutionary biology, but rarely measured, Martin said. He's been fascinated with the concept since high school.

An adaptive landscape takes variable traits in an animal or plant, such as jaw size and shape, spreads them over a surface, and reveals peaks of success (what evolutionary scientists call fitness) where those traits become most effective, or adaptive.

It is a common and powerful idea that influences thinking about evolution. But while the concept is straightforward, it is much harder to map out such a landscape in the wild.

For example, about 50 species of pupfish are found across the Americas. The tiny fish, about an inch or so long, mostly eat algae on rocks and other detritus. Martin has been studying species found only in a few lakes on the island of San Salvador in the Bahamas, where some of the fish have evolved different-shaped jaws that allow them to feed on hard-shelled prey like snails or, in one case, to snatch scales off other fish.

In a paper published in 2011, Martin showed that these San Salvadoran fish are evolving at an explosively faster rate than other pupfish.

Martin brought some of the fish back to the lab at UC Davis and bred hybrids with fish with different types of jaws. He created about 3,000 hybrids in all, which were measured, photographed and tagged. Martin then took about 2,000 of the fish back to San Salvador.

"It was the craziest thing I've done," Martin said. "I was leaning on the stack of them in the middle of Miami airport."

Martin released the young fish into enclosures in the lakes of their grandparents. Three months later, he returned to check on the survivors and plotted them out on the adaptive landscape.

Most of the surviving fish were on an isolated peak adapted to a general style of feeding, with another peak representing fish adapted for eating hard-shelled prey. Competition between the fish had eliminated the fish whose jaws put them in the valleys between those peaks. The scale-eating fish did not survive.

The results explain why most pupfish species in America have pretty much the same diets, Martin said. The generalists are essentially stranded on their peak -- variants that get too far out fall into the valley and die out before they can make it to another peak.

"It's stabilizing selection," he said. An early burst of variation when fish entered a new environment with little competition could have allowed the shell-eaters and scale-eaters to evolve on San Salvador.

The work was supported by grants from the National Science Foundation.


Story Source:

The above story is based on materials provided by University of California Davis (UCD). Note: Materials may be edited for content and length.


Journal Reference:

  1. Christopher H. Martin, Peter C. Wainwright. Multiple Fitness Peaks on the Adaptive Landscape Drive Adaptive Radiation in the Wild. Science, 11 January 2013: Vol. 339 no. 6116 pp. 208-211 DOI: 10.1126/science.1227710

Cite This Page:

University of California Davis (UCD). "A snapshot of pupfish evolution." ScienceDaily. ScienceDaily, 10 January 2013. <www.sciencedaily.com/releases/2013/01/130110142043.htm>.
University of California Davis (UCD). (2013, January 10). A snapshot of pupfish evolution. ScienceDaily. Retrieved November 24, 2014 from www.sciencedaily.com/releases/2013/01/130110142043.htm
University of California Davis (UCD). "A snapshot of pupfish evolution." ScienceDaily. www.sciencedaily.com/releases/2013/01/130110142043.htm (accessed November 24, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Monday, November 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Stray Dog Follows Adventure Racing Team for 6-Day Endurance Race

Stray Dog Follows Adventure Racing Team for 6-Day Endurance Race

Buzz60 (Nov. 24, 2014) A Swedish Adventure racing team travels to try and win a world title, but comes home with something way better: a stray dog that joined the team for much of the grueling 430-mile race. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Terrifying Black Seadevil Fish Captured on First-of-Its Kind Video

Terrifying Black Seadevil Fish Captured on First-of-Its Kind Video

Buzz60 (Nov. 24, 2014) An aquarium captures a first-of-its kind video of a notoriously camera-shy fish that’s also not so camera-friendly. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Red Panda Cubs Explore the Bratislava Zoo

Red Panda Cubs Explore the Bratislava Zoo

AFP (Nov. 24, 2014) Four-month old Red Panda twins Pim and Pam still rely on their mother for breast milk at the Bratislava Zoo in Slovakia, but the precocious cubs have begun to branch out to solid foods, as well. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
Are Female Bosses More Likely To Be Depressed?

Are Female Bosses More Likely To Be Depressed?

Newsy (Nov. 24, 2014) A new study links greater authority with increased depressive symptoms among women in the workplace. Video provided by Newsy
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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