Navigation Links
Geographic profiling applied to track hunting patterns of white sharks in South Africa
Date:6/22/2009

VIRGINIA KEY, Fla. -- Predation is one of the most fundamental and fascinating interactions in nature, and sharks are some of the fiercest predators on Earth. However, their hunting pattern is difficult to study because it is rarely observed in the wild. As a result, shark predatory behavior has remained much of a mystery. Now, researchers from the United States and Canada are using geographic profiling -- a criminal investigation tool used to track a connected series of crimes and locate where serial criminals live -- to examine the hunting patterns of white sharks in South Africa.

Using this tool, scientists looked at the predatory interactions between white sharks and Cape fur seals at Seal Island in False Bay, South Africa. They found that sharks possess a well-defined anchor point or search base for hunting, but not where the chances of prey interception were greatest. Instead the attacks seemed to take place at strategic locations that could offer a balance of prey detection, capture rates, and inter-shark competition. "The study expands our knowledge of how large predators hunt and offers a new scientific reference for studying other predator-prey systems," explained Neil Hammerschlag, Ph.D. candidate at the University of Miami's Rosenstiel School of Marine and Atmospheric Science and co-principal investigator of the study.

"Sharks are apex predators, so studies of shark hunting behavior are important for understanding their ecology and role in structuring marine communities," said Hammerschlag. "Our need for more knowledge of these fascinating animals has become critical because of recent drastic declines in their populations globally."

In an awesome display of power and acrobatic prowess, white sharks attack prey with a sudden vertical rush that propels them out of the water. "They hunt solitary juvenile Cape fur seals when light levels are low, stalking them from near the ocean floor to remain undetected, before launching a vertical attack," Hammerschlag said. "This strategy maximizes a shark's chances of catching a seal unaware thus initiating a fatal first strike. Stealth and ambush are key elements in the white shark's predatory strategy."

Hammerschlag and his collaborators from the University of British Columbia and Texas State University collected data on 340 natural predatory attacks by sharks on seals in False Bay. They were able to observe natural predation by great white sharks because attacks occur at the water's surface where they can be seen from a distance. The researchers found that spatial patterns of shark predation at this site were nonrandom and that smaller sharks had more dispersed prey search patterns and lower kill success rates than larger sharks.

This could mean that white sharks refine their search patterns with experience, and learn to concentrate hunting efforts in locations with the highest probability of successful prey capture. It might also suggest that larger sharks competitively exclude smaller sharks from the prime hunting areas.

The findings will be published in an upcoming issue of the Journal of Zoology and is now available as an advance online publication of the journal.The study uses geographic profiling for the first time in the marine environment. The technology was originally developed by study co-author Dr. Kim Rossmo of Texas State University to determine the most probable area for a criminal offender's residence or anchor point, and has been used in a number of high-profile police investigations internationally.

In addition to applications in law enforcement, geographic profiling has also been applied to studies of the foraging behavior of bats and bumblebees, the spread of infectious diseases in Africa, and the structure of terrorist cells in the Middle East. For more information about geographic profiling visit: www.txstate.edu/gii


'/>"/>

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

Related biology news :

1. EPA teams with National Geographic Society and World Resources Institute to map ecosystem services
2. Threatened birds may be rarer than geographic range maps suggest
3. KINAXOs Cellular Target Profiling reveals mTOR as a new target of Celebrex
4. GEN highlights increasing use of digital gene expression profiling
5. Powerful integration of lipid metabolic profiling with gene expression analysis
6. Cheap and efficient white light LEDs new design described in AIPs Journal of Applied Physics
7. Nitrogen applied
8. Penn presents inaugural symposium on applied mathematics and computational science
9. Lessons from evolution applied to national security and other threats
10. New tracking approach will help protect polar bears
11. Tracking down the causes of multiple sclerosis
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Geographic profiling applied to track hunting patterns of white sharks in South Africa
(Date:5/24/2016)... IRVINE, Calif. , May 24, 2016 Ampronix facilitates superior patient care ... LMD3251MT  3D medical LCD display is the latest premium product recently added to ... ... ... Sony 3d Imaging- LCD Medical Display- Ampronix News ...
(Date:5/12/2016)... , May 12, 2016 WearablesResearch.com , ... published the overview results from the Q1 wave of ... recent wave was consumers, receptivity to a program where ... with a health insurance company. "We were ... share," says Michael LaColla , CEO of Troubadour ...
(Date:4/28/2016)... BANGALORE, India , April 28, 2016 ... of Infosys (NYSE: INFY ), and Samsung SDS, ... partnership that will provide end customers with a more ... payment services.      (Logo: http://photos.prnewswire.com/prnh/20130122/589162 ) ... financial services, but it also plays a fundamental part in ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June, 23, 2016  The Biodesign Challenge ... envision new ways to harness living systems and biotechnology, ... Art (MoMA) in New York City ... 130 participating students, showcased projects at MoMA,s Celeste Bartos ... Paola Antonelli , MoMA,s senior curator of architecture and ...
(Date:6/23/2016)... Apellis Pharmaceuticals, Inc. today announced positive ... its complement C3 inhibitor, APL-2. The trials were ... studies designed to assess the safety, tolerability, pharmacokinetics ... healthy adult volunteers. Forty subjects were ... dose (ranging from 45 to 1,440mg) or repeated ...
(Date:6/23/2016)... Prairie, WI (PRWEB) , ... June 23, 2016 ... ... consultancy focused on quality, regulatory and technical consulting, provides a free webinar ... is presented on July 13, 2016 at 12pm CT at no charge. , ...
(Date:6/22/2016)... Research and Markets has announced the addition ... their offering. The global ... billion in 2013. The market is expected to grow at a ... 2020, increasing from $50.6 billion in 2015 to $96.6 billion in ... forecast period (2015 to 2020) are discussed. As well, new products ...
Breaking Biology Technology: