Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Thinking 'big' may not be best approach to saving large-river fish

23.05.2013
Large-river specialist fishes — from giant species like paddlefish and blue catfish, to tiny crystal darters and silver chub — are in danger, but researchers say there is greater hope to save them if major tributaries identified in a University of Wisconsin-Madison study become a focus of conservation efforts.

The study says 60 out of 68 U.S. species, or 88 percent of fish species found exclusively in large-river ecosystems like the Mississippi, Missouri and Ohio rivers, are of state, federal or international conservation concern. The report is in the April issue of the journal Frontiers in Ecology and the Environment.


The fate of the blue catfish and more than 60 other species of large-river specialist fishes depends on conservation of suitable habitat and connectivity between the Mississippi River and its tributaries.

Credit: Brenda Pracheil

On the other hand, says lead author Brenda Pracheil, a postdoctoral researcher in the UW's Center for Limnology, the study offers some good news, too.

Traditionally, the conservation emphasis has been on restoring original habitat. This task proves impossible for ecosystems like the main trunk of the Mississippi River — the nation's shipping, power production, and flood control backbone. While the locks, dams and levees that make the Mississippi a mighty economic force have destroyed fish habitat by blocking off migration pathways and changing annual flood cycles species need to spawn, removing them is not a realistic conservation option.

But, says Pracheil, we're underestimating the importance of tributaries. Her study found that, for large-river specialist fish, it's not all or nothing. Some rivers are just big enough to be a haven.

For any river in the Mississippi Basin with a flow rate of less than 166 cubic meters of water per second, virtually no large-river specialist fishes are present. But in any river that even slightly exceeds that rate, 80 percent or more of the large-river species call it home.

That means Mississippi tributaries about the size of the Wisconsin River and larger are providing crucial habitat for large-river fishes. When coupled with current efforts in the large rivers themselves, these rivers may present important opportunities for saving species.

"Talk to any large-river fish biologist, and they will tell you how important tributaries are to big river fish," says Pracheil. "But, until now, we've not really understood which rivers are most important. Our study tackles that and shows which tributaries in the Mississippi River Basin show the most promise for conservation of large-river fishes."

Current policies governing large river restoration projects are funded largely through the U.S. Army Corps of Engineers, which requires that funds be spent on mainstems — or the big rivers themselves. Pracheil's study suggests spending some of that money on tributary restoration projects might do more conservation good for fish, while also letting agencies get more bang for their habitat restoration buck.

"Tributaries may be one of our last chances to preserve large-river fish habitat," Pracheil says. "Even though the dam building era is all but over in this country, it's just starting on rivers like the Mekong and Amazon — places that are hotspots for freshwater fish diversity. While tributaries cannot offer a one-to-one replacement of main river habitats, our work suggests that [they] provide important refuges for large-river fishes and that both main rivers and their tributaries should be considered in conservation plans."

Adam Hinterhuer, 608-890-2187, hinterthuer@wisc.edu

Brenda Pracheil | EurekAlert!
Further information:
http://www.wisc.edu

More articles from Ecology, The Environment and Conservation:

nachricht Scientists team up on study to save endangered African penguins
16.11.2017 | Florida Atlantic University

nachricht Climate change: Urban trees are growing faster worldwide
13.11.2017 | Technische Universität München

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>