Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Strong impact of wintering waterbirds on zebra mussel populations at Lake Constance, Germany

20.07.2005


The numbers of overwintering waterbirds at Lake Constance, a large lake on the borders of Germany, Austria and Switzerland, have increased fourfold since the early 1960s, with a daily average of 162 500 waterbirds from September to April as shown by a study published in the august issue of Freshwater Biology. This massive increase coincides with the major expansion of zebra mussels in the lake, originating in the Caspian-Aral basin, and a major pest in Europe and North America.



The main avian population changes concerned the mussel-eating tufted duck, pochard and coot; which currently make up some 80% of all wintering waterbirds at Lake Constance. Stefan Werner, Martin Mörtl and Karl-Otto Rothhaupt from the Limnological Institute at the University of Konstanz; and Hans-Günther Bauer from the Max-Planck Institute for Ornithology in Radolfzell found that the diving ducks and coots deplete mussel populations by more than 90% in water as deep as 11 m each winter. Each bird consumes about 1.4 kg of mussels (fresh mass) per day. At one study site, a shallow lake at Konstanz, the birds removed a total of about 750 tons of mussels per km2 in the course of winter. It is apparent that wintering waterbirds exert a strong top-down effect on the littoral community, but the mussel stocks recover every summer during the absence of their main predators.

Emily Davis | EurekAlert!
Further information:
http://www.blackwellpublishing.com

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

DGIST develops 20 times faster biosensor

24.04.2017 | Physics and Astronomy

Nanoimprinted hyperlens array: Paving the way for practical super-resolution imaging

24.04.2017 | Materials Sciences

Atomic-level motion may drive bacteria's ability to evade immune system defenses

24.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>