Navigation Links
Gray whales likely survived the Ice Ages by changing their diets
Date:7/6/2011

that gray whales survived the disappearance of their primary feeding ground by employing generalist filter-feeding modes, similar to the resident gray whales found between northern Washington State and Vancouver Island," the scientists wrote in their paper.

"A combination of low population numbers and a species migrating between places where humans didn't bother them gave us the impression that gray whales have a stereotypical migratory and feeding behavior that may not be historically correct," Lindberg said.

The new population numbers accord with a 2007 estimate that the California gray whale population was likely 76,000 to 120,000 before humans began hunting them. That estimate, by Stephen Palumbi of Stanford University and his collaborators, was based on an analysis of gray whale genetic diversity.

The numbers clash, however, with claims by some ecologists that populations of between 15,000 and 20,000 are likely the most that the Pacific Coast specifically along the whales' 11,000 kilometer (6,900 mile) migratory route from Baja California to the Bering Sea could support, today or in the past.

"Our data say that, if the higher estimates are right, gray whales would have made it through the Ice Ages in numbers sufficiently large to avoid bottlenecking," Pyenson said. "If gray whale populations were at the lower levels, they would only have squeaked through the ice ages with populations of hundreds or a few thousand. That would have left bottlenecking evidence in their DNA."

Bottlenecking is when populations drop so low that inbreeding becomes common, decreasing the genetic diversity in the species and making them less able to adapt to environmental change.

The new assessment is good news for gray whales, which appear to have "a lot more evolutionary plasticity than anyone imagined," Lindberg said. This could help them survive the climate change predicted within the next few centuries that is characterized b
'/>"/>

Contact: Robert Sanders
rsanders@berkekley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert

Page: 1 2 3 4 5

Related biology news :

1. Humpback whales catch prey with bubble-nets
2. New discovery -- copepods share divers weight belt technique with whales
3. Marine lab research tracks pollutants in dolphins and beluga whales
4. Record number of whales, krill found in Antarctic bays
5. NOAA scientists find killer whales in Antarctic waters prefer weddell seals over other prey
6. Researchers discover new wintering grounds for humpback whales using sound
7. Fleshing out the life histories of dead whales
8. Researchers find first genetic evidence for loss of teeth in the common ancestor of baleen whales
9. Critically endangered whales flee Russian oil, gas boom
10. Blue whales align the pitch of their songs with extreme accuracy, study finds
11. Lone whales shout to overcome noise
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/21/2014)... new strains of bacteria have emerged that resist even ... drug-resistant forms of tuberculosis and staphylococcus, infect more than ... Despite the urgent need for new treatments, scientists have ... past decade. , MIT engineers have now turned a ... system that can disable any target gene, they have ...
(Date:9/21/2014)... developed a protein therapy that disrupts the process that ... sites, travel through the blood stream and start aggressive ... known as metastasis, can cause cancer to spread with ... succumb to cancer fall prey to metastatic forms of ... bioengineering who describes a new therapeutic approach in ...
(Date:9/19/2014)... University of Oklahoma biology professor will study the unique ... that could eventually benefit people,s health. The OU ... the energy required to produce the signals used to ... electric signals at a rate of 500-600 discharges a ... for the electric fish are extreme, but necessary for ...
Breaking Biology News(10 mins):Battling superbugs 2Battling superbugs 3Battling superbugs 4Stanford researchers create 'evolved' protein that may stop cancer from spreading 2Stanford researchers create 'evolved' protein that may stop cancer from spreading 3Stanford researchers create 'evolved' protein that may stop cancer from spreading 4
... Hidenori Ichijo and Hideki Nishitoh (The University of Tokyo) ... genetics of ALS. Amyotrophic lateral sclerosis (ALS), also ... fatal neurological disease involving the degeneration and death of ... the most common neuromuscular diseases worldwide, affecting as roughly ...
... sturgeons, more caviar will be exported from Caspian Sea ... of unacceptably permissive new trade quotas announced Thursday by ... Most sturgeon species are endangered and some, like beluga ... damage this ancient fish,s chance of recovery and survival, ...
... New research* shows that while engineered nanomaterials can ... food chain from single celled organisms to higher ... and there was no evidence of the nanomaterials ... results observed by researchers from the National Institute ...
Cached Biology News:New CITES quotas allow more caviar export, further jeopardize endangered sturgeon 2New CITES quotas allow more caviar export, further jeopardize endangered sturgeon 3New CITES quotas allow more caviar export, further jeopardize endangered sturgeon 4Research measures movement of nanomaterials in simple model food chain 2
(Date:9/22/2014)... 2014  Neogen Corporation (Nasdaq: NEOG ) ... of its 2015 fiscal year, which ended Aug. 31, ... income of $7,839,000 in the first quarter of last ... 30, 2013, earnings per share in the current quarter ... First quarter revenues increased 15% to $67,599,000, from ...
(Date:9/22/2014)... PRINCETON, N.J. , Sept. 22, 2014 /PRNewswire/ ... regulatory and ethical review services for clinical research, ... ® (WIRB) has been reaccredited by the ... Programs (AAHRPP), which endeavors to improve safeguards for ... CEO Donald A. Deieso , Ph.D., commented, ...
(Date:9/22/2014)... 22, 2014 METTLER TOLEDO is ... pallet measuring device CNS110 ScanTape™ . Replacing ... entry, offering greater ease and accuracy for transport ... can significantly enhance productivity—an important benefit for load ... volume equals profits. , Usable at any ...
(Date:9/22/2014)... Md. , Sept. 22, 2014  Spherix Incorporated (SPEX) ... and monetization of intellectual property, today announced that the United ... to the Company in the month of September that is ... The issued patent is: USRE45,121 , Application ... , Filing date: Dec 27, 2012 ...
Breaking Biology Technology:Neogen reports 13% net income increase 2Neogen reports 13% net income increase 3Neogen reports 13% net income increase 4Neogen reports 13% net income increase 5Neogen reports 13% net income increase 6Neogen reports 13% net income increase 7Western IRB (WIRB) Awarded AAHRPP Reaccreditation 2ScanTape™ Handheld Dimensioner Increases Processing Volume 2Spherix Notified by United States Patent & Trademark Office of New Standard Essential Patent Issued to Spherix 2Spherix Notified by United States Patent & Trademark Office of New Standard Essential Patent Issued to Spherix 3
... and PHILADELPHIA, July 4 ,Shire Limited (LSE:SHP, NASDAQ: SHPGY), ... earnings on,Thursday 31 July 2008, Results press ... BST / 07:00 EDT Investor meeting and conference ... Investor & Analyst meeting and conference call:, Angus ...
... Research Group has,released results from aboratory testing ... at Oregon State University which,demonstrated the Eniva ... for human cells. This third party testing ... effort to further identify,mechanisms by which the ...
... Vasogen Inc.,(NASDAQ: VSGN ; TSX:VAS) today announced that ... its cash burn rate. As previously,announced, the Company ... acquisitions and mergers. In conjunction with this,process, the ... its VP,series of drugs, and has determined that ...
Cached Biology Technology:Shire Ltd - Second Quarter 2008 Results Date Notification - 31 July 2008 2Eniva VIBE(R) Nutraceutical Tested at Linus Pauling Micronutrient Research Institute and Found to Possess DNA Protective Properties 2Vasogen Provides Corporate Update 2
These 22x40mm rectangular No.1 Corning cover glasses are made from No. 0211 zinc titania glass and are 0.16 to 0.19mm thick. • Approx. Pcs Oz : 73...
... for use in the Microsart e.motion are sterile-sealed, ... in a specially designed individual package on a ... band of membrane filter units ensures that they ... the sealed band guarantees uniform dispensing of the ...
...
... Speed Rocker, with 12" x 14" table; 115V ... 14" table; 220V. The VSR-50 Variable Speed ... any lab. The VSR-50 provides a rhythmic side-to-side ... gentle to vigourous movement. This makes it ideal ...
Biology Products: