HOME >> BIOLOGY >> NEWS
Fossils tell the hole story of killer drillers and their prey

ANN ARBOR, Mich.---In the classic textbook example, predators and prey are locked in an escalating evolutionary arms race. As prey develop defenses against their attackers, predators go them one better, devising new ways of penetrating their victims' defenses.

But it doesn't always happen that way, and investigating systems in which prey don't respond to predation by upping the ante can be as informative as studying the more typical sort, said University of Michigan paleontologist Tomasz Baumiller. In a report in the June 17 issue of Science, Baumiller and collaborators at Virginia Tech describe how they used fossil shells of animals called brachiopods to shed light on ancient ecological interactions.

Brachiopods, also known as lampshells, were plentiful in Earth's oceans 550 million years ago to 250 million years ago. Today the shelled creatures, which look something like clams, are still around but less prevalent. One way of assessing rates of predation or parasitism on brachiopods and other fossil shellfish is to look for round holes drilled into their shells by their enemies. The researchers studied more than 40,000 specimens from 18 museums, as well as field-based estimates from the literature.

"We wanted to determine at what frequencies drilling had occurred, whether that had changed through time, and what sorts of lessons we could learn from the patterns that we found," Baumiller said. What they found was that attacks on brachiopods were rare, but widespread and continuously present through the entire Paleozoic Era, suggesting that brachiopods were not locked in an arms race with drilling predators. Instead, predators probably picked on brachiopods only when they mistook them for something else or when there was nothing better to eat, the researchers believe.

"The reason is, they're not terribly nutritious---they have a relatively low amount of meat between their shells," which also may explain why you never see brachiopod c
'"/>


16-Jun-2005


Page: 1 2

Related biology news :

1. Fossils of ancient sea monster found in Montana
2. Fossils pinpoint tropics as Earths most fruitful biodiversity spawning ground
3. Early bird caught the fish: Fossils depict aquatic origins of birds 115 million years ago
4. What we can learn from the biggest extinction in the history of Earth
5. Biologist traces coconuts history through DNA
6. Colorado River streamflow history reveals megadrought before 1490
7. Book explores history, causes of allergy and asthma epidemic
8. Academy paleontologist and Alaska artist in line for natural history awards
9. Ancient coral reef tells the history of Kenyas soil erosion
10. Microfossils unravel climate history of tropical Africa
11. 500,000 years of climate history stored year by year

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Fossils tell the hole story killer drillers and their prey

(Date:8/19/2014)... treat pain, but its effect on pain following ... recent study reported on the Neural Regeneration ... models of an avulsion injury to the left ... pain) were given electroacupuncture stimulation at bilateral Quchi ... After electroacupuncture therapy, chronic neuropathic pain in the ...
(Date:8/19/2014)... forms, they have not been widely used due to ... the University of Surrey and Trinity College Dublin have ... graphene, to create a flexible sensor that is sensitive ... , Once treated, the rubber bands remain highly ... imparts an electromechanical response on movement the team ...
(Date:8/18/2014)... , August 19, 2014 ... biometric authentication in smart devices  Trustonic, ... for smart devices, and Fingerprint Cards AB (FPC) ... of FIDO Ready™ secure biometric authentication on connected ... touch fingerprint sensors (FPC1020, FPC1021 and FPC1150) and ...
Breaking Biology News(10 mins):Trustonic and Fingerprint Cards Collaborate to Bring Secure Biometrics to Connected Devices 2Trustonic and Fingerprint Cards Collaborate to Bring Secure Biometrics to Connected Devices 3Trustonic and Fingerprint Cards Collaborate to Bring Secure Biometrics to Connected Devices 4
(Date:8/18/2014)... , Aug. 18, 2014 BioElectronics ... advanced consumer medical devices said that its ... interviewed by CEOLIVE.TV as part of its ... interview is available at http://ceolive.tv/bioelectronics-corp-otc-biel/biel-videos/2282-ceolive-tv-interview-bioelectronics-corp-otcqb-biel ... explains to investors the unique advantages of ...
(Date:8/18/2014)... HIV Infection Drug Market and Pipeline Insight is a ... infection and the number of deaths due to AIDS has ... the globe. It has been estimated that the death rate ... with the rates for children being even much lower. A ... has been the improved access to antiretroviral drugs and therapy ...
(Date:8/18/2014)... 2014 TNI BioTech, Inc. (OTC-BB: TNIB) ("we" ... and marketing of innovative therapies for autoimmune diseases in ... a second notice of TNI BioTech,s annual meeting of ... Noreen Griffin , founder and CEO of TNI ... participation in the Annual Meeting. On behalf of our ...
(Date:8/18/2014)... , 18. August 2014 Vier ... eine internationale klinische Studie auf, in der ... Linse soll das Sehvermögen bei allen Entfernungen ... Operation möglicherweise keine Lese- oder Gleitsichtbrille mehr ... Namen FluidVision Accommodating Intraocular Lens ...
Breaking Biology Technology:BioElectronics EVP Dr. Deepak Kotak Interviewed on CEO Live 2BioElectronics EVP Dr. Deepak Kotak Interviewed on CEO Live 3Global HIV Infection Drug Market Overview 2Global HIV Infection Drug Market Overview 3Global HIV Infection Drug Market Overview 4TNI BioTech Inc., provides 2nd Notice of Annual Meeting September 4, 2014 2TNI BioTech Inc., provides 2nd Notice of Annual Meeting September 4, 2014 3TNI BioTech Inc., provides 2nd Notice of Annual Meeting September 4, 2014 4Implantation einer revolutionären akkommodativen Linse bei Katarakt-Patienten in deutschen Augenzentren im Rahmen einer internationalen klinischen Studie 2Implantation einer revolutionären akkommodativen Linse bei Katarakt-Patienten in deutschen Augenzentren im Rahmen einer internationalen klinischen Studie 3Implantation einer revolutionären akkommodativen Linse bei Katarakt-Patienten in deutschen Augenzentren im Rahmen einer internationalen klinischen Studie 4
Cached News: