Genetic takeover threatens crayfish

grows faster, is larger and has more offspring than the northern clearwater crayfish.

Biologists have feared that besides outcompeting local crayfish, the rusty crayfish also hybridizes with them. However, so far this assessment has been based on morphological studies, which can be ambiguous.

To determine definitively whether introduced rusty crayfish have been hybridizing with local species, Perry and his colleagues compared the DNA of crayfish from 30 sites in the midwestern U.S. The researchers found that hybridization is common. One of the worst cases is Birch Lake, Wisconsin, where only a fourth of the crayfish still have northern clearwater crayfish genes and the entire population already looks exactly like rusty crayfish.

"Wherever the two taxa meet, [the rusty crayfish] ecologically displaces and, through hybridization, genetically assimilates and morphologically extirpates [northern clearwater crayfish] populations," say Perry and his colleagues.

Several states have restricted using the rusty crayfish for fish bait and there are calls for banning the use of live crayfish as bait. This can't come too soon. "We are rarely if ever able to get rid of an exotic species and thus introduced species like the rusty crayfish represent a permanent alteration to the system," says Perry.


Contact: William Perry
Society for Conservation Biology

Page: 1 2

Related biology news :

1. Genetic mutations linked to the practice of burning coal in homes in China
2. Genetic differences might help distinguish thyroid cancers
3. Genetic modification of linseed produces healthier omega 3 and 6 fatty acids
4. Wiley publishes Welcome to the Genome: A Users Guide to the Genetic Past, Present, and Future
5. Genetically modified bacterium as remedy for intestinal diseases
6. Genetic analysis rewrites salamanders evolutionary history
7. Genetic map of important tree genes outlined
8. Genetically-engineered marathon mouse keeps on running
9. Genetic clues found for common congenital brain disorder
10. Genetic mutation linked to more aggressive breast cancer found more often in African-Americans
11. Genetic discovery could dramatically reduce need for liver transplants in children

Post Your Comments:

(Date:6/21/2016)... British Columbia , June 21, 2016 /PRNewswire/ ... appointed to the new role of principal product ... been named the director of customer development. Both ... NuData,s chief technical officer. The moves reflect NuData,s ... teams in response to high customer demand and ...
(Date:6/16/2016)... FRANCISCO , June 16, 2016 ... size is expected to reach USD 1.83 ... by Grand View Research, Inc. Technological proliferation and ... banking applications are expected to drive the market ... ) , The development of advanced ...
(Date:6/9/2016)... attendance control systems is proud to announce the introduction of fingerprint attendance control software, ... employees are actually signing in, and to even control the opening of doors. ... ... ... Photo - http://photos.prnewswire.com/prnh/20160609/377487 ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... TOKYO , June 24, 2016  Regular discussions on ... to take place between the two entities said Poloz. ... in Ottawa , he pointed to the ... and the federal government. ... Poloz said, "Both institutions have common economic goals, why not ...
(Date:6/23/2016)... ... June 23, 2016 , ... UAS LifeSciences, ... launch of their brand, UP4™ Probiotics, into Target stores nationwide. The company, which ... to add Target to its list of well-respected retailers. This list includes such ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... and Mold) microbial test has received AOAC Research Institute approval 061601. , “This ... introduced last year,” stated Bob Salter, Vice President of Regulatory and Industrial Affairs. ...
(Date:6/23/2016)... ... 2016 , ... STACS DNA Inc., the sample tracking software company, today announced ... has joined STACS DNA as a Field Application Specialist. , “I am thrilled ... COO of STACS DNA. “In further expanding our capacity as a scientific integrator, Hays ...
Breaking Biology Technology:
Cached News: