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:1/13/2017)... WASHINGTON, N.Y. , Jan. 13, 2017 /PRNewswire/ ... of technology solutions for the homecare industry, including ... of homecare industry expert, Justin Jugs, as Senior ... brings more than 15 years of homecare experience ... team in developing strategic plans to align Sandata,s ...
(Date:1/12/2017)... 12, 2017  New research undertaken by Fit Small ... future.  1,000 participants were simply asked which office technology had ... may consider standard issue.  Insights on what will ... gathered from futurists and industry leaders including Penelope Trunk ... .  Some of these findings ...
(Date:1/11/2017)... , Jan. 11, 2017 Intoxalock, a ... with the release of its patent-pending calibration device. With ... reliably perform calibrations, securely upload data logs and process ... the customer. "Fighting drunk driving through the ... the public at large, but also for the customer ...
Breaking Biology News(10 mins):
(Date:1/20/2017)... -- Stock-Callers.com explores the Biotech industry to ... recent performances of select equities. In this morning,s lineup ... Abeona Therapeutics Inc. (NASDAQ: ABEO ), Theravance ... Therapeutics Inc. (NASDAQ: SAGE ). According to ... market size is expected to reach $604.40 billion by 2020 due to ...
(Date:1/20/2017)... 2017 http://www.Financialbuzz.com - ... leading causes of death worldwide. There were 8.2 million ... cancer related deaths increased gradually over time, the death ... of various cancers continues to drive demand of biological ... Global Market Insights, Inc. cancer biological therapy market size was ...
(Date:1/19/2017)... Jan 19, 2017 Research and Markets has ... Technology, Biomolecules, Cancer Type, Application - Global Opportunity Analysis and Industry ... ... the global market is projected to reach $15,737 million by 2022 ... 2016 to 2022. Omic technologies segment accounted for ...
(Date:1/19/2017)... Ky. and HOUSTON ... Inc. ("NX Prenatal") today announced the formation of ... together leading clinicians and industry veterans who enhance ... company as it accelerates development of its novel ... to provide medical, clinical and strategic guidance for ...
Breaking Biology Technology: