Navigation Links
First census finds surprisingly few white sharks off California
Date:3/9/2011

In the first census of its kind, research led by UC Davis and Stanford University found that there are far fewer white sharks off central California than biologists had thought.

The study, published today in the journal Biology Letters, is the first rigorous scientific estimate of white shark numbers in the northeast Pacific Ocean. It is also the best estimate among the world's three known white-shark populations (the others are in Australia/New Zealand and South Africa).

The researchers went out into the Pacific Ocean in small boats to places where white sharks congregate. They lured the sharks into photo range using a seal-shaped decoy on a fishing line. From 321 photographs of the uniquely jagged edges of white sharks' dorsal fins, they identified 131 individual sharks.

From these data they used statistical methods to estimate that there are 219 adult and sub-adult white sharks in the region. (White sharks are classed as sub-adults when they reach about 8-9 feet in length and their dietary focus shifts from eating fish to mostly marine mammals. They are adults when they reach sexual maturity for males, that is about 13 feet long; for females, it is about 15 feet.)

"This low number was a real surprise," said UC Davis doctoral student Taylor Chapple, the study's lead author. "It's lower than we expected, and also substantially smaller than populations of other large marine predators, such as killer whales and polar bears. However, this estimate only represents a single point in time; further research will tell us if this number represents a healthy, viable population, or one critically in danger of collapse, or something in-between."

"We've found that these white sharks return to the same regions of the coast year after year," said study co-author Barbara Block, a Stanford University marine biologist and a leading expert on sharks, tunas and billfishes. "It is this fact that makes it possible to estimate th
'/>"/>

Contact: Sylvia Wright, UC Davis News Service
swright@ucdavis.edu
530-752-7704
University of California - Davis
Source:Eurekalert

Page: 1 2

Related biology news :

1. New way to make malaria medicine also first step in finding new antibiotics
2. Complete Genomics launches, becomes worlds first large-scale human genome sequencing company
3. Digital zebrafish embryo provides the first complete developmental blueprint of a vertebrate
4. Synaptics to Report First Quarter Results on October 23
5. Alzheimers disease research attracts first partner
6. Volcanoes may have provided sparks and chemistry for first life
7. Study of polar dinosaur migration questions whether dinosaurs were truly the first great migrators
8. Synaptics Reports Record Results for First Quarter of Fiscal 2009
9. First comprehensive genomic study of common cold reveals new treatment targets
10. Scientists achieve first tracking of salmon from headwaters in Rockies through Pacific to Alaska
11. First results from hospital trials testing
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/28/2014)... South Pole in 1911, but new research shows that ... Using data from 16 ice cores collected from widely ... Pole, a group led by Joe McConnell of the ... most accurate and precise reconstruction to date of lead ... in an article published today in the online edition ...
(Date:7/28/2014)... Millions of people in the United States have a ... It can be painful and may even require surgery ... skeletal muscle wasting and, in turn, limb amputation. , ... Houston (UTHealth) Medical School, scientists tested a non-surgical preventative ... it was associated with increased blood circulation. Their ...
(Date:7/28/2014)... years ago, MIT professor John Essigmann and colleagues from the ... drug. They thought if they could induce the virus to ... die out a strategy that our immune system uses ... drug, which caused HIV to mutate at an enhanced rate, ... patients in a small clinical trial reported in 2011. In ...
Breaking Biology News(10 mins):Lead pollution beat explorers to South Pole, persists today 2Lead pollution beat explorers to South Pole, persists today 3Scientists discover genetic switch that can prevent peripheral vascular disease in mice 2Forced mutations doom HIV 2Forced mutations doom HIV 3Forced mutations doom HIV 4
... LANSING, Mich. The discovery of a new gene ... by Michigan State University and appearing on the cover ... of Sciences , demonstrates that domestic tomatoes could re-learn ... Long-term cultivation has led to tomato crops losing beneficial ...
... GSA Bulletin papers posted online from 20 July ... Mexico, Spain, Turkey, Nova Scotia, Switzerland, New Mexico, and ... the Moho, age dating using zircon crystals, the Code ... GSA Bulletin articles published ahead of ...
... University have found identical strains of antibiotic-resistant ... ) in both antibiotic-free (ABF) and conventionally raised ... pathogens can persist and thrive in the environment, ... Dr. Siddhartha Thakur, assistant professor of population health ...
Cached Biology News:New gene could lead to better bug-resistant plants 2Summer Geoscience from GSA Bulletin 2Summer Geoscience from GSA Bulletin 3Summer Geoscience from GSA Bulletin 4Summer Geoscience from GSA Bulletin 5Summer Geoscience from GSA Bulletin 6Summer Geoscience from GSA Bulletin 7Summer Geoscience from GSA Bulletin 8Summer Geoscience from GSA Bulletin 9Summer Geoscience from GSA Bulletin 10Summer Geoscience from GSA Bulletin 11Summer Geoscience from GSA Bulletin 12Summer Geoscience from GSA Bulletin 13Summer Geoscience from GSA Bulletin 14Summer Geoscience from GSA Bulletin 15Antibiotic-resistant pathogens persist in antibiotic-free pigs 2
(Date:7/29/2014)... South Carolina (PRWEB) July 29, 2014 DisasterTalk ... teams of people where cell phone masts or other transmitters ... up to 100 feet away without the need for any ... target longer ranges. , The new app has launched as ... US homes are at very high risk of being affected ...
(Date:7/29/2014)... Diego, CA (PRWEB) July 29, 2014 ... to Pipette.com’s centrifugation product selection. Eppendorf 5427 R is ... engineering, and DNA – it is targeted towards work ... Eppendorf Centrifuge 5427 R as it compliments their extensive ... their Eppendorf line of microcentrifuge tubes, PCR tubes, PCR ...
(Date:7/29/2014)... July 29, 2014 ... (LBS) zur Erfassung biologischer Daten in Verbindung ... und patentiert. Das LBS nimmt gleichzeitig mehrere ... des Patienten und sucht erhöhte biologische Aktivitäten ... Potenzial, die Entdeckung und Entwicklung neuer Medikamente ...
(Date:7/28/2014)... According to a new market research report published ... Joint) Market (By Technology - Stem Cell Therapy, ... Graft Substitutes, Osteoarticular Diseases, Allogeneic Products, Autogenic Products ... Growth, Trends and Forecast, 2013 - 2019" the ... valued at USD 2.6 billion in 2012 and ...
Breaking Biology Technology:DisasterTalk App Could Save Lives as Report Reveals 8% of US Homes at Very High Risk of Natural Disaster 2International Pipette Distributor, Pipette.com Announces the Addition of the Eppendorf Centrifuge 5427 R to Their Product Portfolio 2PlaqueTec sichert sich CE-Kennzeichnung für Liquid Biopsy System - bahnbrechende Innovation zur Erfassung neuer biologischer Informationen aus erkranktem Herzkranzgefäß 2PlaqueTec sichert sich CE-Kennzeichnung für Liquid Biopsy System - bahnbrechende Innovation zur Erfassung neuer biologischer Informationen aus erkranktem Herzkranzgefäß 3PlaqueTec sichert sich CE-Kennzeichnung für Liquid Biopsy System - bahnbrechende Innovation zur Erfassung neuer biologischer Informationen aus erkranktem Herzkranzgefäß 4Regenerative Medicine Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2013 - 2019 2Regenerative Medicine Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2013 - 2019 3Regenerative Medicine Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2013 - 2019 4
... American Pacific Corporation (Nasdaq: APFC ) ... AMPAC Fine Chemicals LLC (AFC) received the California ... Toxic Substances Control of California (DTSC) and the ... recognizes the overall pollution prevention achievements of AFC,s ...
... Zone for UC" Campaign, Centocor Ortho Biotech Inc. Will ... America for Each Point Pisani Scores During 2008-2009 Season ... announced today a partnership with professional hockey player Fernando ... funding to support continued education and research for the ...
... Calif., March 2 Pearl Therapeutics, a biopharmaceutical ... prevalent respiratory diseases, announced today the appointment of ... to attract a corporate leader with such an ... Ph.D., Venture Partner at 5AM Ventures and Executive ...
Cached Biology Technology:AMPAC Fine Chemicals Receives the California Pollution Prevention Challenge Award Two Consecutive Years 2AMPAC Fine Chemicals Receives the California Pollution Prevention Challenge Award Two Consecutive Years 3Pro Hockey Player Fernando Pisani Looks to Shoot and Score Against Ulcerative Colitis 2Pro Hockey Player Fernando Pisani Looks to Shoot and Score Against Ulcerative Colitis 3Pro Hockey Player Fernando Pisani Looks to Shoot and Score Against Ulcerative Colitis 4Pearl Therapeutics Appoints Perry Karsen as Chief Executive Officer 2
... Tetrad 2 thermal cycler is a completely ... Tetrad chassis, and it accepts the full ... delivers the same precision in thermal performance ... Tetrad thermal cyclers, allowing easy transport of ...
ID clarifier: platform...
... DNA Engine Tetrad 2 thermal cycler ... units (sample-holder, heat-pump assemblies), which hold ... A Pentium-class computer drives an advanced ... sample, and lid temperatures. Peltier heat ...
4',6-Diamidino-2-phenylindole, dihydrochloride (DAPI)...
Biology Products: