Navigation Links
North American freshwater fishes race to extinction
Date:8/9/2012

North American freshwater fishes are going extinct at an alarming rate compared with other species, according to an article in the September issue of BioScience. The rate of extinctions increased noticeably after 1950, although it has leveled off in the past decade. The number of extinct species has grown by 25 percent since 1989.

The article, by Noel M. Burkhead of the US Geological Survey, examines North American freshwater fish extinctions from the end of the 19th Century to 2010, when there were 1213 species in the continent, or about 9 percent of the Earth's freshwater fish diversity. At least 57 North American species and subspecies, and 3 unique populations, have gone extinct since 1898, about 3.2 percent of the total. Freshwater species generally are known to suffer higher rates of extinction than terrestrial vertebrates.

Extinctions in fishes are mostly caused by loss of habitat and the introduction of nonindigenous species. In North America, there are more freshwater fish species in a typical drainage to the east of the Great Continental Divide than to the west, where a greater proportion of species have gone extinct or are found nowhere else.

Estimating the number of extinctions relies on scrutiny of historical records and careful estimation procedures, since the last populations of a species are often recognized as such only in hindsightthere is typically a lag of several years from the last observation of a species and its estimated year of extinction. Estimates are complicated by the fact that, on average, 6.7 new species are discovered each year, and occasionally a species thought to have gone extinct is "rediscovered." Nonetheless, Burkhead concludes that between 53 and 86 species of North American freshwater fishes are likely to have gone extinct by 2050, and that the rate of extinction is now at least 877 times the background extinction rate over geological time.


'/>"/>

Contact: Tim Beardsley
tbeardsley@aibs.org
703-674-2500 x326
American Institute of Biological Sciences
Source:Eurekalert

Page: 1

Related biology news :

1. Active forest management to reduce fire could help protect northern spotted owl
2. Hidden secrets in the worlds most northerly rainforests
3. NOAA plankton surveys, second longest in the North Atlantic, add to new global effort
4. Webcast: Public forum with North Americas environment ministers on community, ecosystem resilience
5. A new species of wirerush from the wetlands in northern New Zealand
6. Scientists discover new trigger for immense North Atlantic plankton bloom
7. Eddies, not sunlight, spur annual bloom of tiny plants in North Atlantic
8. Seabirds study shows plastic pollution reaching surprising levels off coast of Pacific Northwest
9. UCSB scientists compile first study of potential for tsunamis in northwestern California
10. University of North Texas Health Science Center Advances Forensic Research by Investing in Semiconductor DNA Sequencing Technology
11. Grants add to Northwestern-Qatar partnership
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/14/2016)... , April 14, 2016 ... and Malware Detection, today announced the appointment of ... the new role. Goldwerger,s leadership appointment comes ... the heels of the deployment of its platform at ... behavioral biometric technology, which discerns unique cognitive and physiological ...
(Date:3/31/2016)... BOCA RATON, Florida , March 31, 2016 /PRNewswire/ ... LEGX ) ("LegacyXChange" or the "Company") ... presentation for potential users of its soon to be ... The video ( https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also ... by the use of DNA technology to an industry ...
(Date:3/29/2016)... March 29, 2016 LegacyXChange, Inc. ... "LEGX" and SelectaDNA/CSI Protect are pleased to announce our ... in a variety of writing instruments, ensuring athletes signatures ... created collectibles from athletes on LegacyXChange will be assured ... the DNA. Bill Bollander , CEO ...
Breaking Biology News(10 mins):
(Date:5/19/2016)... DIEGO , May 19, 2016 ... (OTC PINK: RGBP) and (OTC PINK: RGBPP) announced today ... creating the first cord blood based cancer immunotherapeutic ... provisional patent application, Regen described a generation of ... was potentiated by gene silencing.  The product in ...
(Date:5/18/2016)... ... May 18, 2016 , ... Tech Coast Angels (TCA) ... to Cognition Therapeutics at the annual ACA Summit last week in Philadelphia. ... one of ACA’s member angel groups. It is the highest honor available for an ...
(Date:5/18/2016)... May 18, 2016 The Biotech industry ... not mean that there are no opportunities ahead. Today, ActiveWallSt.com ... (NASDAQ: THLD ), Seattle Genetics Inc. (NASDAQ: ... and Ophthotech Corp. (NASDAQ: OPHT ). Sign up ... http://www.activewallst.com/ Threshold Pharmaceuticals Inc.,s ...
(Date:5/18/2016)... ... May 18, 2016 , ... Every day, ... result of asthma complications.* Costing more than $56 billion in direct costs annually, ... , “For too many, the suffering associated with uncontrolled asthma can be overwhelmingly ...
Breaking Biology Technology: