Navigation Links
River flow and temperature limit trout numbers
Date:9/9/2009

Over a 23-year study, Javier Lobn-Cervi has found the mechanism that controls the number of salmonids found each year in Cantabrian rivers. His method has been to monitor population numbers in relation to river flow in March, when the juvenile fish emerge. He concludes that environmental conditions change each year and modify river flow, positively or negatively affecting survival rates. This information throws light on a long debate within ecological theory about the mechanisms that regulate the size of animal populations.

In 2000, populations of trout (Salmo trutta) in the rivers of north East Spain suffered an alarming decline, but fishing was never banned, and fish numbers fell still further. However, these populations recovered "naturally" within a very short time period. Javier Lobn-Cervi, lead author of the research study and a researcher at the National Museum of Natural Sciences (CSIC) has the answer, and has published it in the journal Freshwater Biology.

"If we use a small measurement and calculate the amount of water that was flowing in March (when the fish eggs emerge), we can predict how many trout there will be now, how many there will be in two years, how many should be fished, how many females are going to reproduce in other words, we can monitor the entire population perfectly", the researcher tells SINC.

It has taken him 23 years of study to arrive at this conclusion. Contrary to conventional theories, which hold that populations have endogenous mechanisms to respond to variations, and that these depend upon the density of individuals, Lobn-Cervi says populations "simply respond to the environmental conditions that exist at the time".

Since 1986, the scientist has been studying the Chaballos river in the basin of the Esva river in Asturias, where environmental conditions have varied widely year-on-year up to 2007. "Information as simple as river flow in the month of March is enough to en
'/>"/>

Contact: SINC
info@plataformasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. UC Riverside research on barley genome gets boost from $1 million USDA grant
2. Pesticides -- easier detection of pollution and impact in rivers
3. 2009 Charles River Laboratories Excellence in Refinement Award
4. Shifting baselines confound river restoration
5. UC Riverside student is 1 of only 5 persons selected for challenging Arctic expedition
6. Carnegie Mellons Jean VanBriesen leads research team on Monongahela River
7. Scientists discover Amazon river is 11 million years old
8. Troubled waters: Low Apalachicola River flow may hurt gulf fisheries
9. Public lecture at UC Riverside to discuss origin and fate of universe
10. UC Riverside geneticist receives highest honor from Botanical Society of America
11. River delta areas can provide clue to environmental changes, Texas A&M prof says
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
River flow and temperature limit trout numbers
(Date:12/10/2014)... 2014 You,ve been here before: you desperately need ... your password, site key or the answer to your secret ... teacher? Today, Hoyos Labs , a ... will finally put an end to the frustration that comes ... . 1U leverages a user,s smartphone to acquire his or ...
(Date:12/10/2014)... , Dec. 08, 2014 Research and Markets ... addition of the "Biometrics Market in Japan ... http://photos.prnewswire.com/prnh/20130307/600769 The ... such as rural banking and upgradation of the ... witnessed in the market. Besides the aforementioned projects, ...
(Date:12/4/2014)... , Dec. 3, 2014  Crossmatch™, a ... announced that its DigitalPersona ® Pro Enterprise ... have been deployed throughout First Bank branch locations ... South Carolina and Virginia. First Bank, ... Southern Pines, North Carolina , selected ...
Breaking Biology News(10 mins):The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 3Biometrics Market in Japan 2014-2018: Key Vendors are DDS, Fujitsu, Hitachi and NEC 2First Bank Partners with Crossmatch to Increase Log In Security 2First Bank Partners with Crossmatch to Increase Log In Security 3
... is funding a new Physics Frontiers Center at the University ... Living Cells is one of nine Physics Frontiers Centers in ... biological systems. The $7.5 million award will be supplemented ... the total funding to $8.25 million over five years. ...
... that contains enough essential vitamins and minerals. Analysis ... status has shown that the average child gets the recommended ... more added sugars than recommended. The study published ... at a nationally representative sample of children aged 4-18 years ...
... available in German . , Dessau. Extreme ... more than plants. This is the finding of a study ... TU Berlin, the German Federal Institute of Hydrology (BfG), KON ... before and after the Elbe floods of August 2002. Flow ...
Cached Biology News:NSF funds new 'Center for the Physics of Living Cells' at Illinois 2NSF funds new 'Center for the Physics of Living Cells' at Illinois 3Variety of foods -- the key for child nutrition 2Vegetation hardly affected by extreme flood events 2
(Date:12/24/2014)... 2014  Vermillion, Inc. (Nasdaq:   VRML), a ... today that the Company closed its previously announced ... Jack W. Schuler , Birchview Fund LLC ... million, before offering expenses.  The proceeds will be ... Under the terms of the private ...
(Date:12/24/2014)... Missouri (PRWEB) December 23, 2014 GMO ... Swiss biotechnology company, Syngenta, are in the process of ... proceedings. The consolidated case is In Re: Syngenta AG ... U.S. District Court for the District of Kansas. , ... has been handed over to U.S. District Judge John ...
(Date:12/24/2014)... On Friday, December 19, 2014, President ... and Continuing Resolution Appropriations Act of 2015, which ... eligible to receive funding through the Congressionally Directed ... of Defense (DoD). The Hydrocephalus Association (HA), working ... is celebrating this victory for the over 1 ...
(Date:12/24/2014)... Nashville Fertility Center announced that ... the American Society for Reproductive Medicine (ASRM), a leading ... reproductive medicine. In his new role as treasurer, ... board and will have a voice in furthering the ... supported ASRM since 1984 when he joined while conducting ...
Breaking Biology Technology:Vermillion Announces Closing of Equity Financing 2Vermillion Announces Closing of Equity Financing 3Carey Danis & Lowe Reports on Syngenta GMO Corn Transfer Order 2Rare Brain Condition Now Eligible for Department of Defense Research Dollars 2Nashville Fertility Center Announces Dr. George A. Hill Selected to Serve as ASRM Treasurer for 2014-15 2Nashville Fertility Center Announces Dr. George A. Hill Selected to Serve as ASRM Treasurer for 2014-15 3
... Placing the lower case "i" next to a word as a ... fame and glory may be possible, the chances of creating a ... icon is the exclusive longevity of its unique name, and for ... iWatch, Panasonic and not iTV. , ,Terms like interactive ...
... annual outlook for the year in a renovated Grand Ballroom of ... Froehlich of Deutsche Asset Management , Allan Murray of the ... Financial . , , Chicago Sun-Times columnist Terry Savage moderated ... spotlight on. , , Comparing last year to this year ...
... - The Medical College of Wisconsin , in ... been awarded a five-year, $8.1 million federal grant to develop ... and the majority of potential bioterrorism agents. , ,The grant, ... Institute of Allergy and Infectious Diseases , will be used ...
Cached Biology Technology:The I of the storm: iPhones, iPains, and iProblems 2The I of the storm: iPhones, iPains, and iProblems 3The I of the storm: iPhones, iPains, and iProblems 4Economic outlook for 2007, and still clueless on Apple 2Economic outlook for 2007, and still clueless on Apple 3Economic outlook for 2007, and still clueless on Apple 4Economic outlook for 2007, and still clueless on Apple 5Medical College lands $8.1M grant to detect bird flu, bioterror agents 2
UltraPure DNase/RNase-Free Distilled Water is designed for use in all molecular biology applications. It is 0.1-m membrane-filtered and tested for DNase and RNase activity....
...
The S. cerevisiae Hansen strains are the parental yeast strains from which the deletions were derived....
The DNA DipStick Kit is ideal for estimating nucleic acid concentrations and approximate yields. Works with ss- and ds-DNA, RNA, and oligonucleotides at concentrations as low as 0.1 ng/l....
Biology Products: