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:3/22/2017)... LIVERMORE, Calif. , March 21, 2017 ... recognition analytics company serving law enforcement agencies, announced today ... Sheridan as director of public safety business development. ... of diversified law enforcement experience, including a focus on ... Vigilant. In his most recent position, Mr. Sheridan served ...
(Date:3/13/2017)... Future of security: Biometric Face Matching software  ... ... DERMALOGs Face Matching enables to match face pictures against each other or against ... (PRNewsFoto/Dermalog Identification Systems) ... Matching" is the fastest software for biometric Face Matching on the market. The ...
(Date:3/7/2017)... 7, 2017   HireVue , the leading provider ... identify the best talent, faster, today announced the additions ... (CSO) and Diana Kucer as Chief Marketing ... executive team poised to drive continued growth in the ... year of record bookings in 2017. "Companies ...
Breaking Biology News(10 mins):
(Date:4/26/2017)... ... ... LABS, Inc. (LABS) announced in December 2016 that two new Zika Virus ... (NAT) for ZIKV; and Enzyme Immunoassays (EIAs) specific for IgM and IgG ZIKV antibodies. ... under an Investigational New Drug (IND) study protocol. , Now, as part of ...
(Date:4/26/2017)... ... April 26, 2017 , ... ... EMEA and North America this May on the following dates: ... Donald H. Taylor, Chairman of the Learning and Performance Institute will be the ...
(Date:4/26/2017)... April 26, 2017  Genisphere LLC, provider of ... signed a collaborative and sponsored research agreement with ... Muro . The overall goal of the partnership ... various 3DNA designs and formulations after in ... of the vasculature as well as inflammatory responses, ...
(Date:4/25/2017)... , ... April 25, 2017 , ... ... leading supplier of Common Lisp (CL) development tools, and market leader for ... includes key performance enhancements now available within the most effective system for developing ...
Breaking Biology Technology: