HOME >> BIOLOGY >> NEWS
Overfishing may diminish genetic diversity even when millions of fish remain

Populations of marine fish may lose genetic diversity even if fishing stops while there are still several million individuals a number previously assumed to be enough to preserve a diverse gene pool.

Losing the diversity of key genes can render a population less productive and unable to adapt when faced with challenges such as global warming, pollution or changes in predators or prey. Rare genetic variation of little importance today might be the key to adaptability in the future, according to Lorenz Hauser, University of Washington assistant professor with the School of Aquatic and Fishery Sciences and lead author of a report recently published as part of the Proceedings of the National Academy of Sciences.

It could be that genetic diversity in a population needs to be considered when determining sustainable harvests for marine fish fish such as snappers, rockfish and cod that spend their entire lives in the ocean. For some animals studied by conservation biologists, such as pandas and elephants, as few as 500 individuals appear to be enough to maintain rare variances.

For reasons not yet understood, however, it appears that in marine fishes only a small proportion of individuals produce large numbers of offspring that survive. Therefore as a fish population declines the number of such capable breeders may reach levels that cannot sustain genetic diversity.

What Hauser and his co-authors found is that the number of capable breeders is several magnitudes smaller than they expected: In their work with a population of New Zealand snapper that was fished down to about 3 million, only one in 10,000 fish was a capable breeder. That means the genetic diversity for a population of a few million fish could be depending on as little as a few hundred fish.

If such low ratios are commonplace in marine species, many other kinds of marine fish stocks may be in danger of losing genetic variability, the paper says. Fish scales collected and ar
'"/>

Contact: Sandra Hines
shines@u.washington.edu
206-543-2580
University of Washington
1-Nov-2002


Page: 1 2

Related biology news :

1. Overfishing sets the stage for other problems in marine ecosystems
2. Aquaculture: Not An Easy Answer To Overfishing
3. Researchers determine genetic cause of Timothy syndrome
4. Rare childhood genetic syndrome identified
5. New research shows plants can shuffle and paste gene pieces to generate genetic diversity
6. Scientists decipher genetic code of biothreat pathogen
7. Chemical genetics identifies SARS inhibitors
8. 22nd amino acid synthesized and added to genetic code of e. coli bacteria
9. The impact of genetic variations on the treatment of early rheumatoid arthritis
10. Adaptive changes in the genome may provide insight into the genetics of complex disease
11. New genetic hypothesis for the cause of autism

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/7/2020)... ... 2020 , ... Nine middle school teachers from eight states ... unique professional development program that provides advanced STEM (science, technology, engineering and math) ... , Created in partnership between the National Stem Cell Foundation and The Gatton ...
(Date:7/31/2020)... , ... July 30, 2020 , ... ... (SBIR) Phase II contract awarded by the Joint Science & Technology Office—Chemical and ... project is to develop, optimize, and scale-up a highly efficient mammalian cell culture-based ...
(Date:7/18/2020)... ... July 16, 2020 , ... A study ... the Invictus Medical Neoasis™ active noise control device to attenuate typical noises in ... Neoasis™ device attenuated the alarm sounds from patient monitors, ventilators and other bedside ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... ... “We are thrilled to deliver this new technology to the industry” said Matt Hundt, ... market and we were pleased that the IFT jury recognized that.” reFRESH™ couples the ... natural way to extend the shelf life and improve the safety of perishable foods ...
(Date:7/10/2020)... (PRWEB) , ... July 08, 2020 , ... ... services and products, announces a significant expansion of laboratory operations through its ... for agencies implementing testing programs. , Bode-CARES provides a turnkey ...
(Date:7/10/2020)... ... 09, 2020 , ... Sentien Biotechnologies, Inc., a clinical-stage biotechnology ... R. Nissenson, M.D., F.A.C.P., as its Chief Medical Officer. Dr. Nissenson will ... SBI-101. Dr. Nissenson serves as an Emeritus Professor of Medicine at the ...
(Date:7/1/2020)... ... June 29, 2020 , ... MedShift ... 40% in 2020, despite many obstacles created as a result of COVID-19. As ... for its partnered medical practices and medical manufacturers by expanding access to device ...
Breaking Biology Technology:
Cached News: