Navigation Links
Whale sharks may produce many litters from 1 mating, paternity test shows
Date:8/24/2010

How do female whale sharks meet their perfect mates and go on to produce offspring? While little is known about the reproductive behavior of these ocean-roaming giants, a newly published analysis led by University of Illinois at Chicago biologist Jennifer Schmidt reveals new details about the mating habits of this elusive, difficult-to-study fish.

Schmidt, a UIC associate professor of biological sciences, determined paternity of 29 frozen embryos saved from a female whale shark caught off the coast of Taiwan in 1995. The embryos, studied in collaboration with Professor Shoou-Jeng Joung at the National Taiwan Ocean University, are extremely rare.

The pregnant shark carried a surprisingly large number of embryos -- 304 -- still in the uterus and representing a spectrum of age and development stages ranging from being still egg-encased to developed, near-term animals.

Schmidt and her colleagues spent several years developing DNA genetic markers to study whale sharks, initially for population genetics, but in this study the tool was used to determine paternity.

Shark reproduction is still an emerging science, but what is known suggests that most broods are sired by more than one male. That is not what Schmidt found with this particular female whale shark.

"These differently aged embryos -- itself unusual across animal species -- had the same father," Schmidt said. "We have to be very cautious in drawing conclusions from a single litter, but the data suggest female whale sharks store sperm after a single mating event, and subsequently fertilize their own eggs as they are produced."

If the finding can be supported from analysis of other whale shark litters, Schmidt said, "it would suggest that there is no whale shark breeding ground where large numbers of animals meet to mate, but rather that mating occurs as an isolated event."

Follow-up studies may be serendipity. International protocols protect whale s
'/>"/>

Contact: Paul Francuch
francuch@uic.edu
312-996-3457
University of Illinois at Chicago
Source:Eurekalert

Page: 1 2

Related biology news :

1. Blue whales align the pitch of their songs with extreme accuracy, study finds
2. Lone whales shout to overcome noise
3. UCLA biologists report how whales have changed over 35 million years
4. DNA analysis suggests whale meat from sushi restaurants in L.A., Seoul originated from Japan
5. Experts gather to solve mystery of largest recorded die-off of great whales
6. MMS and NOAA scientists study prey of Gulf of Mexico sperm whales
7. New study finds link between marine algae and whale diversity over time
8. New study suggests minke whales are not preventing recovery of larger whales
9. Zoning the ocean may help endangered whales to recover
10. Story of 4.5 million-year-old whale unveiled in Huelva
11. The pitch of blue whale songs is declining around the world, scientists discover
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/18/2014)... predicted to reach 9 billion by 2050 will ... human-altered landscapes such as farmland, according to Stanford ... supports it might be an increasingly scarce commodity ... the land surface is directly affected by humans ... such as climate change. But what if altered ...
(Date:4/18/2014)... comet impacts can cause widespread ecological havoc, killing off ... But new research from Brown University shows that impacts ... the time of an impact. , A research team ... of leaves and preserved organic compounds lodged inside glass ... material could provide a snapshot of environmental conditions at ...
(Date:4/17/2014)... , Respiratory syncytial virus (RSV) is a ... life-threating illness in very young and elderly populations. ... enters host cells through the fusion protein RSV ... interfering peptides that prevent bundle formation limit RSV ... susceptible to degradation. In this issue of the ...
Breaking Biology News(10 mins):Stanford researchers rethink 'natural' habitat for wildlife 2Stanford researchers rethink 'natural' habitat for wildlife 3Stanford researchers rethink 'natural' habitat for wildlife 4Impact glass stores biodata for millions of years 2Impact glass stores biodata for millions of years 3JCI online ahead of print table of contents for April 17, 2014 2JCI online ahead of print table of contents for April 17, 2014 3JCI online ahead of print table of contents for April 17, 2014 4JCI online ahead of print table of contents for April 17, 2014 5JCI online ahead of print table of contents for April 17, 2014 6
... and Wireless ... Solutions for Emergency Responders, WALL, N.J., Oct. 15 ... biometric,identification and wireless public safety solutions, today announced that,it will ... of Chiefs of Police (IACP) Conference and,Exposition, October 15-17 at ...
... early in adulthood, aging begins to slow the mind,s growth ... suggests a Princeton University study on the brains of adult ... soon after marmoset monkeys reach adulthood, the rate at which ... animals, brains begins to decline. The hippocampus is associated with ...
... (AD) is a progressive neurodegenerative disorder characterized by ... amyloid plaques and neurofibrillary tangles. Neuronal and synaptic ... occur in specific brain areas involved in memory ... cerebral deposition of A" plays a seminal role ...
Cached Biology News:BIO-key International Showcasing Innovative Public Safety Solutions at 2007 IACP Conference 2BIO-key International Showcasing Innovative Public Safety Solutions at 2007 IACP Conference 3Brain cell growth diminishes long before old age strikes, animal study shows 2Paradigm shift in Alzheimers's research: new treatments 2Paradigm shift in Alzheimers's research: new treatments 3Paradigm shift in Alzheimers's research: new treatments 4
(Date:1/15/2014)... 15, 2014 AudioNotch is the internet's ... for the treatment of tinnitus. Patients listen to sound ... over a period of weeks to months, their tinnitus volume ... two forms: Notched Music and Notched White Noise. Now, AudioNotch ...
(Date:1/14/2014)... , Jan. 14, 2014  3D Communications, a leading provider of ... regulatory, business, and media events in the United States ... former associate Virginia Cox , JD, is returning to the ... Virginia Cox re-joins 3D after more than two years of ...
(Date:1/14/2014)... iLab Solutions, the leader in core facility management ... Product Strategy. In this role, Michelle will work with current ... in the development of iLab products. Her main goal will ... to the scientific community by offering the most advanced, user-friendly, ...
(Date:1/14/2014)... 13, 2014 Bob Hainsey, a semiconductor ... 20 years in the industry, has joined SPIE, ... will serve as the society’s Science and Technology Strategist. ... SPIE as our Technology Strategist, further strengthening the technical ...
Breaking Biology Technology:Former FDA Associate Commissioner Returns To 3D Communications 2iLab Solutions Announces Michelle Detwiler as the New Director of Product Strategy 2Photonics R&D Leader Bob Hainsey Joins SPIE Technical Staff 2
... In a video interview, new CEO,Andrew Witty comments on ... strategic vision for the business., The ... diversified global business - Deliver more products of value ... and vodcast are available now on, http://www.cantos.com . It,s free ...
... 23 Duska Therapeutics,Inc. (OTC Bulletin Board: DSKA) ... a synopsis of a proposed Phase 3 clinical ... Food and Drug Administration,s (the,"FDA") Division of Cardiovascular ... with the FDA, including a face-to-face,meeting held on ...
... Next generation design reduces the amount of retraction needed for surgical ... ... July 23 Pioneer Surgical Technology,today announces the market availability of ... optimize,anterior cervical fusion procedures while addressing the clinical needs of,anterior cervical ...
Cached Biology Technology:Duska Therapeutics Submits Phase 3 ATPace(TM) Protocol to FDA for Comment 2Duska Therapeutics Submits Phase 3 ATPace(TM) Protocol to FDA for Comment 3Duska Therapeutics Submits Phase 3 ATPace(TM) Protocol to FDA for Comment 4Pioneer(R) Surgical Technology, Inc. Announces the Market Launch of the SlimFuse(TM) Anterior Cervical Plate System 2
Human HVEM/TNFRSF14 Allophycocyanin MAb (Clone 94801)...
Enodgenous alkaline phosphotase inhibitor. Levamisole solution is supplied in concentrated form (20x). The final concentration of levamisole in the substrate solution will be 1 mM....
X-gal,1g...
...
Biology Products: