Navigation Links
TUM scientists document aquatic species decline at dams and weirs
Date:9/14/2011

reduction in the number, biomass and variety of periphyton, invertebrates, and fish species upstream of the weirs. Compared with downstream areas, the diversity of fish species measured upstream of weirs was 25 percent lower on average; a threefold decline in biomass was also observed.

Current-loving fish species, many of which are on the "Red List" of endangered species, are particularly severely affected. "Brown trout, grayling and Danube salmon are demanding fish species that require oxygen-rich water and spawn in coarse gravel areas. As typical residents of the upper reaches of rivers, they are unable to find suitable habitats in dammed areas," explains Juergen Geist, Professor of Aquatic Systems Biology at TUM. "These river sections are often dominated instead by bream, chub, and even carp generalist species that are actually adapted to stagnant waters. The ecological impoverishment of rivers is particularly dramatic when series of dams prevent the sufficient interlinking of different habitat types," says Geist. According to the Bayerische Landesamt fr Umwelt (Bavarian Environmental Agency) there are more than 10,000 weirs in Bavaria's rivers alone.

According to the researchers, the main reason for the species decline is not the impermeability of the barrier to migrating fish species. Instead, the deciding factor is the chemical and physical alteration of the river itself which leads to a reduction of biodiversity. If the current is decelerated or interrupted, the flow rate upstream of the weir declines, and this is accompanied by increased water depth. In all of the surveyed dammed areas, the TUM scientists also recorded major differences in the oxygen content and temperature of the water and the sediment in the river bed, which hinders reproduction in current-loving fish species. The situation is compounded by differences in the structure of the sediments. The particles in the sediment found downstream of weirs are twice as large on avera
'/>"/>

Contact: Undine Ziller
ziller@zv.tum.de
49-816-171-5403
Technische Universitaet Muenchen
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Scientists concerned about pesticide education funding
2. Scientists utilise breath and sweat to detect trapped humans
3. USC scientists generate first detailed map of human neuroreceptor
4. USC scientists probe connection between sight and touch in the brain
5. Biomedical/health informatics scientists to present cutting-edge science, health IT
6. Scientists offer way to address age-old questions
7. USC scientists identify key protein linked to acute liver failure
8. Scientists make turfgrass safer for animals, deadly for insects
9. Scripps Research scientists pinpoint shape-shifting mechanism critical to protein signaling
10. New cellular surprise may help scientists better understand human mitochondrial diseases
11. Scripps Research scientists establish new class of anti-diabetic compound
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/29/2014)... wrong food at a restaurant, don,t blame yourself; blame the ... with what you want and more to do with a ... the selections of over 300 diners, the Cornell study published ... showed that when it comes to what you order ... the menu and how you imagine it will taste. , ...
(Date:7/29/2014)... debilitating effects of a stroke is an immensely ... as well as effective therapy. Advancing such knowledge ... the primary focus of research by Sergei Adamovich, ... the NJIT faculty more than a decade ago. ... substantial funding from sources such as the National ...
(Date:7/29/2014)... developed an easier method to create DNAprotein conjugates. ... in diagnosing diseases. , DNA linked to proteins ... that can be used in diagnostic techniques, nanotechnology ... proteins with DNA can be used for ... of biological material. The method also provides easier ...
Breaking Biology News(10 mins):Menu secrets that can make you slim by design 2Continuing the quest for better stroke therapies 2Continuing the quest for better stroke therapies 3New method provides researchers with efficient tool for tagging proteins 2
... February 20, 2012A team of researchers has found a ... will continue to be available, despite the potential attack ... Disease and poses a significant threat to the California ... Alamos National Laboratory (LANL), University of California at Davis ...
... PA, February 21, 2012 Using a noninvasive test on ... new algorithm for analysis, scientists can detect, with a high ... chromosomal abnormalities that cause Down syndrome and a genetic disorder ... scalable than other recently developed genetic screening tests and has ...
... has awarded The University of Texas at Austin and ... Dynamics Collaboratory (DDC), a network of researchers working to ... reliably predict the physical and ecological evolution of river ... the project, including Paola Passalacqua, assistant professor in Civil, ...
Cached Biology News:More grapes, less wrath: Hybrid antimicrobial protein protects grapevines from pathogen 2Noninvasive method accurately and efficiently detects risk of Down syndrome 2Noninvasive method accurately and efficiently detects risk of Down syndrome 3Engineering, geoscience faculty help lead $3 million NSF Delta research collaboration 2
(Date:7/29/2014)... , July 29, 2014   Sequenom, Inc. ... company that provides innovative genetic analysis solutions, and ... esoteric laboratory services in the United States ... prenatal testing patents and applications. "We have ... and patient care, and we welcome the opportunity to ...
(Date:7/29/2014)... separated from its properties? On July 29, the prestigious ... the first Cheshire Cat experiment, separating a neutron from ... CA, and Vienna University of Technology. , Chesire Cat"Well! ... Alice in Wonderland, "but a grin without a cat! ... my life!" Alice,s surprise stems from her experience that ...
(Date:7/29/2014)... created a new way of manufacturing microstructured surfaces ... by self-assembly of carbon nanotubes, could exhibit a ... stiffness and strength, or the ability to repel ... demonstrated that mechanical forces can be used to ... that we can independently control the mechanical ...
(Date:7/29/2014)... 2014  Pomerantz LLP is investigating claims on behalf ... "Company") (NASDAQ: IPXL).  Such investors are advised to contact ... or 888-476-6529, ext. 237. The investigation concerns ... have violated Sections 10(b) and 20(a) of the Securities ... 29, 2014, Impax Laboratories, Inc. (the "Company") issued a ...
Breaking Biology Technology:Sequenom Enters Into License Agreement With Mayo Medical Laboratories 2Sequenom Enters Into License Agreement With Mayo Medical Laboratories 3Sequenom Enters Into License Agreement With Mayo Medical Laboratories 4The quantum Cheshire cat: Scientists separate a particle from its properties 2The quantum Cheshire cat: Scientists separate a particle from its properties 3The quantum Cheshire cat: Scientists separate a particle from its properties 4A new way to make microstructured surfaces 2SHAREHOLDER ALERT: Pomerantz Law Firm Investigates Claims On Behalf of Investors of Impax Laboratories, Inc. - IPXL 2
... 30 VEGA PROMOTIONAL SYSTEMS, INC. (Pink Sheets: VGPR) today ... Power Company, Inc. to assist the Company in building a ... Vega recently announced its intention to build a biomass plant ... materials in the State,s Bioenergy Corridor. Georgia ranks third ...
... Novavax, Inc. (Nasdaq: NVAX ) announced today ... (VLP) vaccine technology to ROVI Pharmaceuticals (Madrid: ROVI) of ... create a comprehensive influenza vaccine solution for the Spanish ... led by the Spanish Ministry of Health and other ...
... Bion Environmental Technologies, Inc. (OTC Bulletin Board: BNET) ... Patent application 11/592,513 entitled "Low Oxygen Biologically Mediated Nutrient ... on November 6, 2006; upon publication and issuance, the ... force until November 5, 2024. This new patent strengthens ...
Cached Biology Technology:Vega Picks Tennessee Firm to Assist with Construction of Biomass Plant in Georgia 2Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 2Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 3Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 4Spanish Government Selects Novavax's VLP Technology for Comprehensive Flu Vaccine Solution in Spain 5Bion Announces Approval of New U.S. Patent that Broadens Protection for the Company's Livestock Waste Environmental Treatment Processes 2
... The HEEBO (Human Exonic Evidence Based ... Evidence Based Oligonucleotide ) Genome Set contain ... largely derived from constitutively expressed exons, allowing ... collaboration with leading researchers at Stanford University ...
odz, odd Oz/ten-m homolog 1 [Source:RefSeq_peptide;Acc:NP_055068] Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
Rabbit polyclonal to FANCE ( Abpromise for all tested applications). entrezGeneID: 2178 SwissProtID: Q9HB96...
Rabbit polyclonal to NIRF ( Abpromise for all tested applications). Antigen: Synthetic peptide derived from residues 186-235 of human NIRF. Entrez Gene ID: 115426 Swiss Protein ID: Q96PU...
Biology Products: