Featured Research

from universities, journals, and other organizations

Fish Diet Linked To Evolution, Ten Million Year Old Chipped Teeth Show

Date:
September 30, 2007
Source:
Natural Environment Research Council
Summary:
Chips from 10 million years ago have revealed new insights into fish diets and their influence on fish evolution, according to a new article in Science. The chips were found, along with scratches, on the teeth of fossil stickleback fish and reveal for the first time how changes in the way an animal feeds control its evolution over thousands of years. This kind of study has previously not been possible because although fossils preserve direct evidence of evolutionary change over thousands and millions of years, working out exactly what a long-dead fossil animal was eating when it was alive, and establishing a link between feeding and evolution, is very difficult.

Tips of two teeth showing chips and scratches.
Credit: Image courtesy of Natural Environment Research Council

Chips from 10 million years ago have revealed new insights into fish diets and their influence on fish evolution, according to new research featured in this week’s issue of the journal Science. The chips were found, along with scratches, on the teeth of fossil stickleback fish and reveal for the first time how changes in the way an animal feeds control its evolution over thousands of years.

Related Articles


This kind of study has previously not been possible because although fossils preserve direct evidence of evolutionary change over thousands and millions of years, working out exactly what a long-dead fossil animal was eating when it was alive, and establishing a link between feeding and evolution, is very difficult.

The stickleback tooth chips and scratches were formed 10 million years ago as part of the normal process of tooth wear while the fish were alive and feeding in a large lake in what is now Nevada. “Like footprints in sand, the wear on teeth preserves a trail of evidence of how a fish feeds and what it feeds on,” says Dr Mark Purnell from the University of Leicester, lead author on the report. “The difficult bit was learning how to read that trail.”

The research team, based at the universities of Leicester, UK, and Stony Brook, USA, captured living stickleback (of the common or garden pond variety), fed them different kinds of food in different conditions and then examined their teeth using a powerful electron microscope. The team also looked at the teeth of wild stickleback, which had been feeding naturally, from Alaskan lakes.

Professor Paul Hart, also from the University of Leicester, explains: “The teeth might be tiny, but we discovered a very clear picture. Stickleback that feed from lake bottoms have very different tooth wear from those that eat water fleas and the like which swim around in open water”. The fossil teeth have almost exactly the same wear patterns as living stickleback but they have changed through time.

Dr. Mike Bell, from Stony Brook University adds, “Stickleback are spiky little characters, with armour and spines on their sides and along their backs. We found that evolutionary changes in these characteristic features were closely linked to shifts in feeding away from the lake bottom. As feeding changed over thousands of years, the stickleback in the fossil sequence evolved to have fewer spines.”

Scientifically, this is highly significant. That feeding and diet is an important control on evolution is exactly what would be expected from evolution by natural selection, but this is the first time that this aspect of Darwin’s theory has been directly testable using fossils that record real evolutionary change over many thousands of years. “We now know that by looking at microscopic chips and scratches on fish teeth we can investigate important evolutionary questions that were previously in the realm of the unknowable” concludes Purnell.

The paper, ‘Correlated Evolution and Dietary Change in Fossil Stickleback’ by Mark Purnell, Michael Bell, David Baines, Paul Hart and Matthew Travis is published in the September 28 issue of Science.


Story Source:

The above story is based on materials provided by Natural Environment Research Council. Note: Materials may be edited for content and length.


Cite This Page:

Natural Environment Research Council. "Fish Diet Linked To Evolution, Ten Million Year Old Chipped Teeth Show." ScienceDaily. ScienceDaily, 30 September 2007. <www.sciencedaily.com/releases/2007/09/070929105007.htm>.
Natural Environment Research Council. (2007, September 30). Fish Diet Linked To Evolution, Ten Million Year Old Chipped Teeth Show. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2007/09/070929105007.htm
Natural Environment Research Council. "Fish Diet Linked To Evolution, Ten Million Year Old Chipped Teeth Show." ScienceDaily. www.sciencedaily.com/releases/2007/09/070929105007.htm (accessed October 30, 2014).

Share This



More Fossils & Ruins News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dracula's Dungeon May Have Been Found in Turkey

Dracula's Dungeon May Have Been Found in Turkey

AP (Oct. 29, 2014) — Historians think they may have discovered a dungeon in Turkey where the Romanian prince who inspired Count Dracula was once held captive. (Oct. 29) Video provided by AP
Powered by NewsLook.com
Study Doesn't Prove Megalodons Are Extinct, Never Needed To

Study Doesn't Prove Megalodons Are Extinct, Never Needed To

Newsy (Oct. 27, 2014) — How and why a study about when the giant prehistoric shark Megalodon went extinct got picked up as "proof" that it is. Video provided by Newsy
Powered by NewsLook.com
One-of-a-Kind BMW 507 Boat Found After 6 Decades

One-of-a-Kind BMW 507 Boat Found After 6 Decades

Buzz60 (Oct. 27, 2014) — BMW made just one BMW 507 boat, but it was lost for decades until a young man found and restored it. TC Newman (@PurpleTCNewman) shows the gorgeous boat! Video provided by Buzz60
Powered by NewsLook.com
Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Reuters - Innovations Video Online (Oct. 24, 2014) — Miniature deep sea animals discovered off the Australian coast almost three decades ago are puzzling scientists, who say the organisms have proved impossible to categorise. Academics at the Natural History of Denmark have appealed to the world scientific community for help, saying that further information on Dendrogramma enigmatica and Dendrogramma discoides could answer key evolutionary questions. Jim Drury has more. Video provided by Reuters
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