Fossil data plugs gaps in current knowledge, study shows

Oct 02, 2007

Researchers have shown for the first time that fossils can be used as effectively as living species in understanding the complex branching in the evolutionary tree of life.

While many scientists feel that fossils can offer insights from the ancient past, others have been reluctant to use extinct species because the data they offer is often less complete.

Most biologists, for example, have traditionally tried to piece together the evolutionary relationships between species using only the animals that are alive today.

But in research published in journal Systematic Biology, scientists from the University of Bath and the Natural History Museum compared the morphological datasets of 45 animal groups, both living (extant) and extinct.

By running a series of analyses they were able to measure how much the family tree of life needed to be altered when data from these extant and extinct species is included or removed.

They found no difference in the impact that the fossil groups made on the family tree compared to extant groups.

“Evolutionary biologists try to reconstruct rapid and deep evolutionary branching events that happened many tens or hundreds of millions of years ago,” said Dr Matthew Wills from the Department of Biology & Biochemistry, who worked with Andrea Cobbett (University of Bath) and Dr Mark Wilkinson (Natural History Museum).

“Unlike living species, fossils offer ancient snapshots of life forms that were around at the time those branching events occurred.

“Also, living species have millions of years ‘worth’ of change piled on top of this, which can often bury the important signals we need to understand.

“Despite this, detractors have claimed that because fossil data are often less complete, usually just bones, shells and other hard parts, they are likely to muddy the water and make it difficult to find a robust evolutionary tree.

“What our research has done is demonstrate conclusively, and for the first time, that this is not the case.

“We also show that adding just one fossil to an analysis can result in a radically different picture of that group's evolutionary history. The trees constructed without fossils may be oversimplifications, and far from the truth.”

Source: University of Bath

Explore further: Japan lab cannot repeat ground-breaking cell finding: reports

add to favorites email to friend print save as pdf

Related Stories

Tooth loss in birds occurred about 116 million years ago

Dec 11, 2014

The absence of teeth or "edentulism" has evolved on multiple occasions within vertebrates including birds, turtles, and a few groups of mammals such as anteaters, baleen whales and pangolins. Where early birds are concerned, ...

International team maps 'big bang' of bird evolution

Dec 11, 2014

The genomes of modern birds tell a story of how they emerged and evolved after the mass extinction that wiped out dinosaurs and almost everything else 66 million years ago. That story is now coming to light, ...

Recommended for you

Protections blocked, but sage grouse work goes on

14 hours ago

(AP)—U.S. wildlife officials will decide next year whether a wide-ranging Western bird species needs protections even though Congress has blocked such protections from taking effect, Interior Secretary ...

Contrasting views of kin selection assessed

16 hours ago

In an article to be published in the January issue of BioScience, two philosophers tackle one of the most divisive arguments in modern biology: the value of the theory of "kin selection."

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.