Navigation Links
New study illustrates the physics behind great white shark attacks on seals
Date:12/9/2011

MIAMI -- A new study examining the complex and dynamic interactions between white sharks and Cape fur seals in False Bay, South Africa, offers new insights on the physical conditions and biological factors underlying predator-prey interactions in the marine environment.

University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science assistant professor Dr. Neil Hammerschlag, and a colleague from the University of British Columbia, describe how sharks are camouflaged as they stalk their prey from below. Low-light conditions, from the optical scattering of light through water, along with a shark's dark grey back and the dimly light rocky reef habitat allow sharks to remain undetected by seals swimming at the water's surface.

"Animal hunting in the ocean is rarely observed by humans," said Hammerschalg, director of the RJ Dunlap Marine Conservation Program at UM. "The high frequency of attacks by white sharks on seals at our study site in South Africa provides a very unique opportunity to uncover new insights about predator-prey relationships."

Sharks typically search, stalk and strike their prey from below. The vast majority of predatory strikes by sharks and Cape fur seals occur against small groups of young-of-the-year seals. Predatory activity by sharks is most intense within two hours of sunrise and quickly decreases as light penetration in the water column increases.

"Stealth and ambush are key elements in the white shark's predatory strategy," said Hammerschlag.

Cape fur seals also have unique techniques to detect, avoid, outmaneuver and in some cases injure the white shark in order to avoid predation by sharks.

According to the authors, if a seal is not disabled during the shark's initial shark, the small seal can use its highly maneuverable body to leap away from the shark's jaws to evade a second strike.


'/>"/>
Contact: Barbra Gonzalez, UM Rosenstiel School
barbgo@rsmas.miami.edu
305-421-4704
University of Miami Rosenstiel School of Marine & Atmospheric Science
Source:Eurekalert  

Page: 1

Related biology news :

1. Study shows more shrubbery in a warming world
2. Brigham and Womens Hospital awarded $9.6 million to study whole genome sequencing
3. New Montana State University, Pennsylvania study reveals North Americas biggest dinosaur
4. Solar power much cheaper to produce than most analysts realize, study finds
5. UGA study documents lung function declines in firefighters working at prescribed burns
6. New study puts eco-labels to the test
7. Study of Yellowstone wolves improves ability to predict their responses to environmental changes
8. Early Earth may have been prone to deep freezes, says CU-Boulder study
9. Singapore and China scientists perform first Asian genome-wide association study on spine disease
10. Study finds climate changes faster than species can adapt
11. Global warming changes balance between parasite and host in fish -- new study
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New study illustrates the physics behind great white shark attacks on seals
(Date:8/29/2014)... them, fold them: modern materials that are light, flexible ... artificial skin or electronic paper. , Making such concepts ... a new way of working with copper nanowires and ... , Previous success in the field of ultra-lightweight "aerogel ... gold and silver nanowires. , By turning instead ...
(Date:8/28/2014)... America (ESA) is pleased to announce the selection of ... Society. Honorary Membership acknowledges those who have served ESA ... the affairs of the Society that has reached an ... the ESA Governing Board and then voted on by ... the Awards Ceremony at Entomology 2014, ESA,s Annual Meeting ...
(Date:8/28/2014)... available in German . ... its name to a striking pattern of blue stripes alternating ... reflective silvery cells, and yellow cells emerge during growth in ... a multilayered mosaic to compose the characteristic colour pattern. ... have to interact to form proper stripes, the embryonic origin ...
Breaking Biology News(10 mins):Copper shines as flexible conductor 2Fred Baxendale selected as Honorary Member of the Entomological Society of America 2How the zebrafish gets its stripes 2How the zebrafish gets its stripes 3
... front-line defense don’t necessarily rest quietly until invading bacteria ... them to action, as previously thought. In a new ... bacteria can barge inside these guard cells and independently ... published online ahead of print in the April issue ...
... Rothberg of the University of Rochester Chemistry Department received a ... recent discovery by Huixiang Li, a research associate in his ... and make sure we're drinking clean water and eating uncontaminated ... help forensics labs identify criminals, test ponds and pools before ...
... Hypotheses, an Elsevier publication, has announced the winner of ... by Judith Rich-Harris, author of The Nurture Assumption and ... selection process in the evolution of human hairlessness and ... of the journal. The £1,000 prize, launched in 2004, ...
Cached Biology News:Microbes start immune response by sneaking inside cells 2Rapid, Low-Cost DNA Testing 2Rapid, Low-Cost DNA Testing 3Why aren't humans furry? Stone-Age moms could be the answer 2
(Date:8/28/2014)... DIEGO, California, USA (PRWEB) August 28, 2014 ... the Department of Physics and Optical Science and Director ... the University of North Carolina at Charlotte, and co-founder ... been elected to serve as the 2015 Vice President ... , SPIE 2014 President Philip Stahl announced recent election ...
(Date:8/28/2014)... 28, 2014 “This kit has an improved ... from 0 to 150 ppb,” said Mark Tess, PhD, Mycotoxin ... benefit to plant owners and USDA-GIPSA inspection agencies that have ... Testing can take place in a matter of minutes with ... plant test the feed and grain before accepting it, but ...
(Date:8/28/2014)... YORK , Aug. 28, ... that a new market research ... catalogue: Whole Exome ... Kits (Library Preparation, Target Enrichment), ... (Sequencing by Synthesis), by Application ...
(Date:8/28/2014)... SunTrust Robinson Humphrey (STRH) today announced the ... research team in biotechnology and oilfield services.  ... demonstrates our commitment to providing our valued institutional ... decision making," said Biff Woodruff , Head ... significant investments in differentiated content at a time ...
Breaking Biology Technology:Glenn Boreman, UNC Professor and Plasmonics Co-Founder, Elected to SPIE Presidential Chain 2Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 2Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 3Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 4Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 5Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 6Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 7Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 8Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 9Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 10Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 11Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 12Whole Exome Sequencing Market by Product (Systems, Kits (Library Preparation, Target Enrichment), by Services (Sequencing), by Technology (Sequencing by Synthesis), by Application (Cancer, Monogenic disorders) - Global Forecast to 2018 13SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 2SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 3
... Biotech Inc. (TSX: ONC, NASDAQ: ONCY ) ... Pandha of the Royal Surrey County Hospital, U.K., was ... Clinical Cancer Research. The paper is entitled "Synergistic Effects ... Melanoma." , The research demonstrated that the innate cancer ...
... , , RICHMOND, Va., Sept. ... fourth year in a row, according to an annual survey published ... brand follows recent No. 1 rankings from Pollina Corporate Real Estate ... rankings by all three of these reputable business brands at one ...
... , , ATLANTA, Sept. 24 ... (the "Company"), an Atlanta-based, biopharmaceutical company developing human vaccines for ... announcement today of partial success in the recently completed Phase ... by Sanofi-Aventis and Global Solutions for Infectious Diseases. The completed ...
Cached Biology Technology:Oncolytics Biotech(R) Inc. Announces Reovirus and Cisplatin Research Supports U.S. Phase 2 Metastatic Melanoma Trial 2Virginia Now Owns Three Top National Business Rankings 2Encouraging HIV/AIDS Vaccine Trial Results Support GeoVax Labs, Inc. Strategy 2Encouraging HIV/AIDS Vaccine Trial Results Support GeoVax Labs, Inc. Strategy 3Encouraging HIV/AIDS Vaccine Trial Results Support GeoVax Labs, Inc. Strategy 4
... ISO 9001:2000 Certified USDA Research Registered ... SOP's Training AALAS Certified Technicians ... Procedures GLP Documentation Upon Request Focus ... point for all your custom immunology service ...
... XL provides balance data collection and automation that ... integration with Microsoft Excel , Pre-configured library ... , New balances can be added and configured ... from multiple balances into one spreadsheet ...
...
... With increasing age, the autofluorescent ... of many cell types, including neurons. ... complicate the use of fluorescence microscopy ... of its broad excitation and emission ...
Biology Products: