Navigation Links
The winners of mass extinction: With predators gone, prey thrives

In modern ecology, the removal or addition of a predator to an ecosystem can produce dramatic changes in the population of prey species. For the first time, scientists have observed the same dynamics in the fossil record, thanks to a mass extinction that decimated ocean life 360 million years ago.

What was bad for fish was good for the fish's food, according to a paper published today in Proceedings of the National Academy of Sciences. Researchers from the University of Chicago, West Virginia University, and The Ohio State University find that the mass extinction known as the Hangenberg event produced a "natural experiment" in the fossil record with results that mirror modern observations about predator-prey relationships.

"This is the first time that specific, long-term predator-prey interactions have been seen in the fossil record," said Lauren Sallan, graduate student in the Department of Organismal Biology and Anatomy at the University of Chicago and lead author. "It tells us a lot about the recovery from mass extinctions, especially mass extinctions that involved a loss of predators."

Paleontologists know the Devonian Period, which spanned from 416 to 359 million years ago, as the Age of Fishes, a time of astonishing diversity for marine vertebrate species. That thriving world was devastated by the Hangenberg event, a mass extinction of unknown origin that set the stage for modern biodiversity.

But some species survived the carnage of the Hangenberg event. The next 15 million years in the fossil record are dominated by crinoids, species similar to modern sea lilies and related to starfish. So abundant and diverse were these marine animals that the period is known as the Age of the Crinoids; entire limestone deposits from the era are made up of crinoid fossils.

"We've been puzzled for many years as to why there were so many species and specimens of crinoids," said study co-author Thomas Kammer, PhD, Eberly College Centennial Professor of Geology at West Virginia University. "There had to be some underlying evolutionary and ecological reason for that."

Researchers considered whether a change in the environment, such as water temperature or depth, could explain the crinoid explosion, Kammer said. Changes in predation were also proposed, but hard to test using the fossil record.

"You don't actually find the evidence of a fossil fish with a crinoid in its mouth very often," Kammer said.

The riddle was solved through multi-institutional collaboration and data-sharing. A database of crinoid diversity in the fossil record assembled by Kammer and William Ausich, PhD, study co-author and Professor of Earth Sciences at Ohio State University, was compared to a vertebrate dataset created by Sallan.

When the datasets were placed side by side and analyzed, a clear relationship emerged. As fish populations thrived in the Devonian, crinoid diversity and abundance remained low despite favorable conditions. But after the Hangenberg event devastated fish species, crinoids thrived, diversifying and multiplying. The data suggests the ripple effects of a mass extinction upon ecosystems can last millions of years.

"This study demonstrates a clear example of processes that operate in ecological time predator-prey relationships becoming significant in evolutionary time," Ausich said. "This means that ecological patterns and processes taking place today may have very long-reaching evolutionary effects. And although that idea may not seem particularly surprising at first, respected evolutionary biologists have long argued that it was not possible."

Eventually, the success of crinoids came to an end. As fish species recovered to previous levels, crinoid populations declined in tandem further evidence for typical predator-prey dynamics known as Lotka-Volterra cycles in modern ecology.

Fossils even suggest that the long period of dominance had left the crinoids especially vulnerable to a new predator strategy. In the Devonian era, crinoids evolved hard armored shells to defend against fish with sharp "shearing" teeth. But when fish populations returned in force 15 million years after the Hangenberg event, those species used "crushing" teeth well suited for thwarting crinoid defenses.

The persistence of a once-beneficial trait that becomes obsolete should be called a "legacy adaptation," the authors propose. In the absence of a predator-prey arms race, a species' inherited defenses may become outdated, Sallan said.

"There's a complete absence of predation pressure and the crinoids take off, but they retain their defenses as if they can't get out of them," Sallan said. "When a new form of predator appears, they can go directly for the best solution to cracking a crinoid, which is crushing. The Devonian-era armor of crinoids isn't suited for defending against that attack, but they can't lose it without losing all of their residual defenses."


Contact: Robert Mitchum
University of Chicago Medical Center

Related biology news :

1. ASPO announces 2011 award winners in pediatric otolaryngology research
2. Biophysical Society announces 2011 Student Research Achievement award winners
3. Evolutionary winners and losers revealed in collaborative study
4. Winners to share $1 million prize in Office of Naval Research challenge
5. Filmmakers Joel and Ethan Coen among 2011 Dan David Prize winners
6. Joshua E. Neimark Memorial Travel Assistance Award winners investigate stem cell transplantation, sustainable growth, women in academia, and conservation science
7. BTER Foundation announces winners of the William S. Baer Award
8. American Association of Anatomists announces young investigator award winners
9. Biophysical Society announces winners of 2011 Student Travel Awards
10. Biophysical Society announces winners of 2011 CPOW Travel Awards
11. Biophysical Society announces winners of 2011 International Travel Awards
Post Your Comments:
Related Image:
The winners of mass extinction: With predators gone, prey thrives
(Date:10/29/2015)... Connecticut , October 29, 2015 ... a biometric authentication company focused on the growing ... smart wallet announces that StackCommerce, a leading marketplace ... be featuring the Wocket® smart wallet on StackSocial ... NXTD ) ("NXT-ID" or the "Company"), a biometric ...
(Date:10/27/2015)... 27, 2015 In the present market scenario, ... for various industry verticals such as banking, healthcare, defense, ... growing demand for secure & simplified access control and ... as hacking of bank accounts, misuse of users, , ... as PC,s, laptops, and smartphones are expected to provide ...
(Date:10/27/2015)... SAN JOSE, Calif. , Oct. 27, 2015 /PRNewswire/ ... human interface solutions, today announced that Google has adopted ... family of touch controller solutions to power its newest ... Nexus 6P by Huawei. --> ... ecosystem partners like Google to provide strategic collaboration in ...
Breaking Biology News(10 mins):
(Date:12/1/2015)... SAN FRANCISCO , Dec. 1, 2015  Symic, ... and affect the extracellular matrix (ECM), today announced that ... financing to advance the company,s pipeline, including its lead ... Lilly Ventures and includes the participation by all existing ... new funding brings the total capital raised by Symic ...
(Date:12/1/2015)... Texas (PRWEB) , ... December 01, 2015 , ... Matthew ... his new post, VerMilyea will oversee all IVF lab procedures as well ... and fertility preservation. , “We traveled 7,305 miles to Auckland, New Zealand to bring ...
(Date:11/30/2015)... ... 2015 , ... Global Stem Cells Group today ... Santiago Marriott. The Global Stem Cells Group GMP facility is equipped with the ... medical researchers and practitioners, experienced in administering stem cell protocols using highly manipulated ...
(Date:11/30/2015)... 1, 2015 Partnership includes an ... for the u niversity , s ... treatment s cale - up ... Africa , where licensees based anywhere in the world will ... technology. --> Africa , where licensees based anywhere in the ...
Breaking Biology Technology: