Navigation Links
Older killer whales make the best mothers
Date:2/3/2009

Killer whales (Orcinus orca) nearing the menopause may be more successful in rearing their young. New research published in BioMed Central's open access journal Frontiers in Zoology shows that estimated survival rates for calves born to these older mothers were 10% higher than those for other calves.

Eric Ward from the Northwest Fisheries Science Center, Seattle, USA, coordinated a team of researchers who studied killer whales inhabiting the inland and nearshore waters of Washington state (USA) and British Columbia (Canada). They used a 30-year dataset collected by the Center for Whale Research and Canada's Department of Fisheries and Oceans. He said, "During annual photographic surveys, nearly every individual in the population has been recorded. Each animal has unique pigmentation, scars, and fin shapes, allowing us to track the survival and reproductive performance of each female over time".

The authors aimed to investigate what benefits killer whales derive from the menopause. One theory, termed the "attentive mother hypothesis", is that giving birth to calves and then losing the ability to reproduce helps the mother to focus on bringing up her offspring, without wasting time and energy on further pregnancies. The authors' results support this theory to an extent in that during a calf's first year of life, having a mother who was nearing menopause increased chances of survival. According to Ward, "We found that the oldest mothers may also be the best mothers. Older females may be more successful in raising young because of maternal experience, or they may allocate more effort to their offspring relative to younger females".

Killer whales are extremely long lived, with one female believed to be more than 90 years old. Males rarely live past 50, but female life expectancy is considerably longer. Females can produce their first calf as early as age 10, and continue to produce offspring until their early 40s.


'/>"/>
Contact: Graeme Baldwin
graeme.baldwin@biomedcentral.com
44-020-707-94804
BioMed Central
Source:Eurekalert

Page: 1 2

Related biology news :

1. Gardening gives older adults benefits like hand strength and self-esteem
2. Gardening gives older adults benefits like hand strength and self esteem
3. Research finds older women who are more physically fit have better cognitive function
4. Pain is in the eyes of the beholder
5. Older people who diet without exercising lose valuable muscle mass
6. BIO-key(R) Issues Open Letter to Shareholders
7. Testosterone replacement theraphy beneficial in men 60 and older
8. RING finger protein 5 may guide treatment for muscle disease in older adults
9. Stakeholders use science to find common ground on wood supply from forests
10. Worlds largest investor coalition seeks further disclosure on climate change and shareholder value
11. High blood pressure in older adults traced to genes effects in blood vessels
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2015)... LAKE CITY , June 25, 2015  Imagine ... first steps toward a healthier, happier life. That,s exactly ... is designed to do. The cutting-edge, portable health program ... offers real-life solutions to help improve your lifestyle and ... Association awards dinner and gala Wednesday night, USANA,s THA ...
(Date:6/24/2015)... DUBLIN , June 22, 2015 ... has announced the addition of the "Huawei ... Analysis" report to their offering. ... going to the opposite direction than Apple,s and ... innovative fingerprint sensor developed by Fingerprint Cards, a ...
(Date:6/23/2015)... GARDENS, Fla. , June 23, 2015 ... identity management and authentication solutions, today announced enhanced ... strong, multi-factor authentication solution.  The enhancements build ... use of the DigitalPersona Altus platform and ... reader compatibility. In today,s environment ...
Breaking Biology News(10 mins):@USANAinc's Personalized Nutrition Program Wins Industry Innovation Award 2Huawei Ascend Mate 7 Fingerprint Sensor - Reverse Costing Analysis 2Crossmatch Releases Enhanced DigitalPersona Altus Advanced Authentication Functionality 2
... are reporting this week new study results they say provide ... from bone marrow for patients suffering from acute lung injury, ... intensive care units. Led by Drs. Michael A. Matthay ... the University of California, San Francisco, the team writes in ...
... Chemical Society (ACS) and the Council for Chemical ... address the critical challenge of keeping the United States, chemical ... will play in this process. Entitled "Translational Chemical R&D: The ... Sunday, Aug. 22, during the ACS National Meeting & Exposition ...
... Scientists researching the causes and effects of hypoxia in Green ... for the first year of an anticipated four-year $1,367,300 project ... has been a problem for decades, and recent evidence suggests ... zones" and fish kills to become both more frequent and ...
Cached Biology News:Using bone marrow stem cells to treat critically ill patients on verge of respiratory failure 2Using bone marrow stem cells to treat critically ill patients on verge of respiratory failure 3American Chemical Society, Council for Chemical Research to hold R&D symposium Aug. 22 2American Chemical Society, Council for Chemical Research to hold R&D symposium Aug. 22 3NOAA awards grant to investigate impacts of land use and climate change on hypoxia in Green Bay 2
(Date:6/30/2015)... ... 2015 , ... Students and faculty from Beijing City University ... “Integrative Biotechnology,” an applied biotechnology course team-taught by faculty members from both institutions. ... from both universities and is taught on both continents. , “Our alliance with ...
(Date:6/30/2015)... June 30, 2015  Today, Americord Registry, one of the ... Andrew Horne , a partner at Kirkland & Ellis LLP, ... Logo - http://photos.prnewswire.com/prnh/20150630/226958LOGO   "We are ... Board," says Martin Smithmyer , CEO of Americord. "He ... career that will assist Americord,s growth and vision." ...
(Date:6/30/2015)... ... June 30, 2015 , ... Matrix Marketing Group, LLC , ... hired Gem Swartz to head up its account management department as vice president of ... and Amanda bring senior account management and delivery expertise to the growing Matrix Marketing ...
(Date:6/30/2015)... IL (PRWEB) , ... June 30, 2015 , ... ... effective August 14. She has accepted the position of vice president of instruction ... August 17. , “I greatly appreciated the opportunity to lead SIUE during ...
Breaking Biology Technology:Rivier University and Beijing City University Academic and Cultural Exchanges Begin 2Americord Registry Announces Andrew Horne as Advisory Board Member 2Matrix Marketing Group Expands Client Services Team 2SIUE’s Furst-Bowe Accepts VP of Instruction at CVTC 2SIUE’s Furst-Bowe Accepts VP of Instruction at CVTC 3
... A sensitive and simple high performance liquid chromatograph tandem ... of the metabolites of four nitrofuran antibiotics in chicken tissue. ... , The animal ... and derivatization followed by liquid-liquid (L-L) extraction before analysis. The ...
... of nucleotide and nucleoside analogs from Taraxacum mongolicum, a ... using liquid chromatography tandem mass spectrometry (LC/MS/MS). The active ... nucleoside standards with product and precursor scans of tandem ... major active ingredients which have anti-Herpes simplex virus type ...
... are difficult or generally not to analyse by GC/MS, , ... solvent extraction , and fast cleanup ... The drawback of MS/MS methods is laborious parameter optimization for , ... significantly be reduced by the use , ...
Cached Biology Technology:High sensitivity quantitation of metabolites of nitrofuran antibiotics in animal tissue using LC/MS/MS 2High sensitivity quantitation of metabolites of nitrofuran antibiotics in animal tissue using LC/MS/MS 3Isolation and Characterization of Anti-Viral Nucleoside Compounds from the Chinese Herb Taraxacum Mongolicum 2Isolation and Characterization of Anti-Viral Nucleoside Compounds from the Chinese Herb Taraxacum Mongolicum 3Simultaneous Determination of Residues of Approximately 100 Pesticides , and Metabolites in Fruit and Vegetables by LC/MS/MS 2Simultaneous Determination of Residues of Approximately 100 Pesticides , and Metabolites in Fruit and Vegetables by LC/MS/MS 3Simultaneous Determination of Residues of Approximately 100 Pesticides , and Metabolites in Fruit and Vegetables by LC/MS/MS 4Simultaneous Determination of Residues of Approximately 100 Pesticides , and Metabolites in Fruit and Vegetables by LC/MS/MS 5Simultaneous Determination of Residues of Approximately 100 Pesticides , and Metabolites in Fruit and Vegetables by LC/MS/MS 6