Navigation Links
Hammerhead shark study shows cascade of evolution affected size, head shape
Date:5/18/2010

cephalofoils is an increased number of electrical sensors in their flattened noses and heads that can detect extremely weak electrical emissions from molecules associated with potential prey. "Hammerheads appear to be able to triangulate on their prey, which is remarkable," said Martin.

Small sharks are highly variable in the size and shape of their cephalofoils, said Martin. The winghead shark, for example, has a laterally expanded head that is about half the size of its roughly 4-foot body length. At the other end of the spectrum is the bonnethead shark, about 3 feet long but which has the smallest cephalofoil of all hammerhead species -- a protrusion that resembles the head of a shovel, Martin said.

Martin said that hammerheads are an ideal biological study subject in part because of some important similarities to humans. Both have slow growth rates, mature late in life, give live birth and have relatively few offspring. While hammerheads may have a dozen or more pups, other oceanic fish regularly lay millions of eggs. Hammerheads generally live for about 30 years, he said.

While hammerhead sharks appear intimidating, attacks on humans are extremely rare, said Martin. Hammerheads have relatively small mouths facing downward that are used to grab food like fish, shellfish, shrimp, squid, octopuses and stingrays. "If you see a hammerhead, I'd say grab your camera and jump into the water," said Martin.

"Hammerheads are special fish, and there is nothing that remotely resembles them anywhere on the planet," said Martin. Unfortunately, hammerheads -- like most shark species -- are on the decline. In addition to being overfished, sharks often are the victims of a technique known as finning, in which fishermen catch them, cut off their fins for use in delicacy soups, and return them to the water to die, Martin said. Shark meat also is used for fertilizer and to make pet food.

There currently are 233 shark species on
'/>"/>

Contact: Andrew Martin
andrew.martin-1@colorado.edu
303-492-2573
University of Colorado at Boulder
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Wide heads give hammerheads exceptional stereo view
2. Extinct giant shark nursery discovered in Panama
3. Study of shark virgin birth shows offspring can survive long term
4. New forensic technique gives clues about sharks from bite damage
5. Tags reveal white sharks have neighborhoods in the north Pacific, say Stanford researchers
6. New species of ghostshark from California and Baja California
7. Scientists shed new light on behavior of shark tweens and teenagers
8. Scientists conduct shark survey off US East Coast
9. Negligible impact on public safety from shark cage diving operations
10. Geographic profiling applied to track hunting patterns of white sharks in South Africa
11. From Jack the Ripper to great white sharks
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Hammerhead shark study shows cascade of evolution affected size, head shape
(Date:9/19/2014)... new resource unveiled today by researchers from several ... Dublin provides both experienced and aspiring researchers with ... and operate robots made from soft, flexible materials. ... laser cutters, and other advances in manufacturing technology, ... field. Using principles drawn from conventional rigid robot ...
(Date:9/19/2014)... A University of Oklahoma biology professor will study ... control leg movements with a National Science Foundation ... four-year project. , Ari Berkowitz, professor in the ... Sciences, will focus on the differences between the ... understand what neurotransmitters they use and what connections ...
(Date:9/19/2014)... a species which over thousands of years has adapted to ... substance that makes the cold dangerous for you. , This ... , and the cold provoking substance, called nonylphenol, comes from ... is suspected of being a endocrine disruptor, but when entering ... worm,s ability to protect the cells in its body from ...
Breaking Biology News(10 mins):Soft robotics 'toolkit' features everything a robot-maker needs 2Environmental pollutants make worms susceptible to cold 2Environmental pollutants make worms susceptible to cold 3
... An anticipated increased incidence of climate-related extreme rainfall events ... risk for the 40 million people who depend on the ... In a report published today (Oct. 7, 2008) in ... of Wisconsin researchers reports that a trend toward extreme weather ...
... fish are created equal. A report scheduled to ... the journal Proceedings of the National Academy of ... herbivorous fishes may be critical to restoring coral reefs, ... from a long-term study that found significant recovery in ...
... of the first comparisons of its kind, researchers have demonstrated ... hold onto about 80 percent more carbon than can wetlands ... wetlands in Costa Rica and in Ohio and analyzed the ... on their analysis, they estimated that the tropical wetland accumulated ...
Cached Biology News:Waterborne disease risk upped in Great Lakes 2Waterborne disease risk upped in Great Lakes 3Diversity of plant-eating fishes may be key to recovery of coral reefs 2Diversity of plant-eating fishes may be key to recovery of coral reefs 3Diversity of plant-eating fishes may be key to recovery of coral reefs 4Study: Tropical wetlands hold more carbon than temperate marshes 2Study: Tropical wetlands hold more carbon than temperate marshes 3
(Date:9/18/2014)... Sept. 18, 2014 About POCT ... performed outside a clinical laboratory. It helps in ... appropriate treatments and medication. POCT is gaining popularity ... lifestyle diseases such as diabetes, heart disease, and ... devices are standardized to minimize errors during the ...
(Date:9/18/2014)... 18, 2014 A novel robotic system ... scanner is currently being tested as part of a ... in Boston with the aim of determining if the ... prostate cancer biopsies faster, more accurate, less costly, and ... has the potential to deliver prostate cancer therapies with ...
(Date:9/18/2014)... DUBLIN, Ireland , September 18, ... ,Research and Markets ( http://www.researchandmarkets.com/research/czvg3s/biocompatible ) ... "Biocompatible Materials - Global Strategic ... offering. ,     (Logo: http://photos.prnewswire.com/prnh/20130307/600769) ,This report ... Materials in US$ Million by the ...
(Date:9/18/2014)... 2014 On Tuesday, Secretary of Energy ... Risch for National Lab Day on the Hill. The ... national laboratory system. Durbin and Risch also formally launched ... awareness of the reach of the national labs as ... address some of our nation's most pressing challenges. , ...
Breaking Biology Technology:POCT Market in China 2014-2018 2Worcester Polytechnic Institute Participates in Clinical Trial for MRI-Compatible Robot Designed to Improve Accuracy of Prostate Cancer Biopsies 2Worcester Polytechnic Institute Participates in Clinical Trial for MRI-Compatible Robot Designed to Improve Accuracy of Prostate Cancer Biopsies 3Worcester Polytechnic Institute Participates in Clinical Trial for MRI-Compatible Robot Designed to Improve Accuracy of Prostate Cancer Biopsies 4Worcester Polytechnic Institute Participates in Clinical Trial for MRI-Compatible Robot Designed to Improve Accuracy of Prostate Cancer Biopsies 5Worcester Polytechnic Institute Participates in Clinical Trial for MRI-Compatible Robot Designed to Improve Accuracy of Prostate Cancer Biopsies 6Biocompatible Materials - Global Strategic Business Report 2014 2Biocompatible Materials - Global Strategic Business Report 2014 3Lab Day Highlight Labs' Contribution to U.S. Competitiveness and Innovation 2Lab Day Highlight Labs' Contribution to U.S. Competitiveness and Innovation 3
... ERES ), a leading provider of centralized,electrocardiographic ... will release its 2008 first quarter results for ... 5,2008 after the market closes.,After the release, the ... PM ET,later that day., For the conference ...
... KENILWORTH, N.J., April 23 Schering-Plough,Corporation (NYSE: ... animal,health products from 12 product franchises in Europe. ... by the European Commission as part,of its October ... health business from Akzo Nobel N.V., In ...
... Summary: At Genmab A/S,Annual General Meeting held today ... approved, discharge was given to the Board of Directors ... Two members of the,Board of Directors were re-elected and ... from the Board of,Directors to change the Articles of ...
Cached Biology Technology:eResearchTechnology, Inc. to Announce 2008 First Quarter Results on May 5, 2008 2Schering-Plough Announces Planned Divestiture of Select Animal Health Products in Europe 2Passing of Genmab A/S' Annual General Meeting 2Passing of Genmab A/S' Annual General Meeting 3Passing of Genmab A/S' Annual General Meeting 4
Cell Culture Flask, 175 cm, tissue-culture treated polystyrene, barcoded...
... an aqueous solution that contains a purified ... a PBS buffer (phosphate buffered saline), pH ... a combination of 0.02% methylisothiazolone and 0.02% ... Stabilizer provides optimum performance for both microsphere ...
... clone K28/86.2, PDZ Domain GenBank ... : GST fusion to residues 77-299 ... Tris pH 7.4, 0.075M NaCl containing ... evaluated by immunoblot on rat brain ...
... The ProteoPrep 20 Plasma Immunodepletion Kit ... proteins from human plasma or serum in ... enables deeper penetration into the plasma proteome ... single or multidimensional chromatography or go straight ...
Biology Products: