Navigation Links
Ancient food webs developed modern structure soon after mass extinction
Date:3/19/2014

Researchers from the Santa Fe Institute and the Smithsonian Institution have pieced together a highly detailed picture of feeding relationships among 700 mammal, bird, reptile, fish, insect, and plant species from a 48 million year old lake and forest ecosystem.

Their analysis of fossilized remains from the Messel deposit near Frankfurt, Germany, provides the most compelling evidence to date that ancient food webs were organized much like modern food webs. Their paper describing the research appears online and open access this week in Proceedings of the Royal Society B: Biological Sciences.

The researchers first compiled data about the more than 6,500 feeding relationships among 700 species found in the deposit, which dates to the Eocene epoch. Then they constructed two networks of feeding interactions one for the lake and one for the surrounding forest.

Next, they mathematically compared each food web's structural features with those of modern-day food web datasets matching up such indicators as fractions of cannibals, herbivores, and omnivores; the distributions of generalist and specialist feeders; the mean lengths of feeding chains connecting pairs of taxa; and so on.

"What we found is that the Messel lake food web, with 94 taxa and 517 links, looks very much like a modern food web," says SFI Professor Jennifer Dunne. "This is despite the fact that 48 million years of species turnover and evolution separate the Messel lake ecosystem from modern ecosystems."

Analysis of the Messel forest food web's structure was more challenging due to the high degree of species diversity represented in the Messel dataset 630 taxa and 5,534 feeding links far more than what datasets for modern webs include.

"Basically, we don't yet have examples of comprehensive modern terrestrial food web datasets that have the high resolution of plants, insects, and their interactions that we included in the Messel forest dataset," says Dunne.

Nevertheless, the researchers were able to show that the Messel forest web is likely comparable in structure to modern webs, by using models to account for differences in structure that would result from the many more taxa and interactions in the Messel data.

The results are significant because they show that the Messel ecosystem developed a modern ecological structure, along with a modern biota, in a relatively brief 18 million year period following Earth's most recent die-off, the end-Cretaceous mass extinction, which disrupted ecosystem dynamics on a massive scale and served as a species diversity bottleneck.

Dunne says that beyond the ecological and evolutionary significance of the study, the work resulted in the most highly resolved, detailed, and comprehensive terrestrial food web ever compiled.

"We want our data to serve as a challenge to ecologists to compile more highly and evenly resolved food web data for extant systems," she says.

Ancient food webs are particularly difficult to reconstruct because data about them is usually limited and of low quality. But the Messel shale deposit is unique. Scientists hypothesize that releases of toxic volcanic gases rendered the area's air and water lethal to most life in a short time. Animals in and near the lake were overwhelmed, and, along with plants, sunk to the low-oxygen depths of the lake where they were smothered in mud and fossilized, soft tissue and all.

The Messel includes outstanding evidence of feeding interactions, including stomach contents and bite marks in soft tissues that can be traced back to particular species' mouth parts, Dunne says.

"Compiling such a highly resolved food web was possible for the Messel because of the exquisite preservation of soft body parts and ecological traces in the deposit," she says, "and because my co-author, Conrad Labandeira, is one of the world's foremost experts on fossil plant-insect interactions."


'/>"/>

Contact: Jennifer Dunne
jdunne@santafe.edu
Santa Fe Institute
Source:Eurekalert  

Related biology news :

1. Ancient DNA shows moa were fine until humans arrived
2. Climate of Genghis Khans ancient time extends long shadow over Asia of today
3. Ancient herring catch nets fisheries weakness
4. Wasps use ancient aggression genes to create social groups
5. Substance in photosynthesis was at work in ancient, methane-producing microbes
6. Forest emissions, wildfires explain why ancient Earth was so hot
7. Arctic warmth unprecedented in 44,000 years, reveals ancient moss
8. Fossil pigments reveal the colors of ancient sea monsters
9. Ancient sharks reared young in prehistoric river-delta nursery
10. Amber fossil reveals ancient reproduction in flowering plants
11. Ancient fig wasp lived tens of millions of years before figs
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ancient food webs developed modern structure soon after mass extinction
(Date:3/29/2017)... 2017  higi, the health IT company that operates ... America , today announced a Series B investment ... EveryMove. The new investment and acquisition accelerates higi,s strategy ... transform population health activities through the collection and workflow ... higi collects and secures data today on behalf of ...
(Date:3/27/2017)... , March 27, 2017  Catholic Health ... and Management Systems Society (HIMSS) Analytics for achieving ... Adoption Model sm . In addition, CHS previously ... U.S. hospitals using an electronic medical record (EMR). ... its high level of EMR usage in an ...
(Date:3/24/2017)... , Mar 24, 2017 Research and ... Access System Market Analysis & Trends - Industry Forecast to 2025" ... ... to grow at a CAGR of around 15.1% over the next ... This industry report analyzes the market estimates and forecasts for all ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... ComplianceOnline’s Medical Device Summit is back for its ... 2018 in San Francisco, CA. The Summit brings together current and former FDA office ... directors and government officials from around the world to address key issues in device ...
(Date:10/11/2017)... TX (PRWEB) , ... October 11, 2017 , ... ... August compared the implantation and pregnancy rates in frozen and fresh in ... contribution of progesterone and maternal age to IVF success. , After comparing the ...
(Date:10/10/2017)... ... October 10, 2017 , ... Dr. Bob Harman, founder and CEO ... Diego Rotary Club. The event entitled “Stem Cells and Their Regenerative ... attendees. Dr. Harman, DVM, MPVM was joined by two human doctors: Peter B. ...
(Date:10/9/2017)... DIEGO , Oct. 9, 2017  BioTech ... biological mechanism by which its ProCell stem cell ... critical limb ischemia.  The Company, demonstrated that treatment ... amount of limbs saved as compared to standard ... the molecule HGF resulted in reduction of therapeutic ...
Breaking Biology Technology: