Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Midge bones in lake sediments reveal fish history

12.05.2009
The mouth parts of the phantom midge are microscopic. But in the hands of scientists from the Department of Zoology at the University of Gothenburg these midge bones become a time machine that can document 200 years of acidification and fish elimination in Swedish lakes.

Acidification of land and water is one of the greatest environmental problems of modern time. Many European lakes still show obvious signs of acidification, and have lead to extensive fish elimination and severely reduced biological diversity.

arlier research has shown a clear connection between fish elimination and larvae of the phantom midge, where a reduction in the fish population can lead to an explosion of phantom midge larvae in acidified lakes.

This invasion of midges forms the basis of a unique research project at the University of Gothenburg. Researchers can now reconstruct the development of fish population in acidified lakes and learn how the population has changed in past centuries by investigating mouth parts of phantom midges that have been preserved in lake sediments.

"What we do can, in fact, be viewed as a journey through time, in which we reconstruct the history of a lake from the early 19th century onwards. We analyse the occurrence of the phantom midge mouth parts and determine which species are present in the sediments. This allow us to determine whether the number of fish has increased or decreased through history, whether fish have been eliminated completely and disappeared from the lake, and we can also give a rough description of when different fish species have been eliminated during periods of severe acidification", says Fredrik Palm, doctoral student and researcher in the Department of Zoology at the University of Gothenburg.

This method of investigation makes it possible to study the effects of acidification in lakes in which samples have not previously been taken, and where historical information about the fish population is not available.

"Such studies, in turn, make it possible to decide how the biological restoration of an acid lake should be carried out, since it reveals the structure of a fish population that should be the restoration target, in order for the lake to be considered fully restored", says Fredrik Palm.

The historical perspective of the method also makes it possible to survey natural variations in lake ecosystems. In this way, scientists can estimate human impact on lake ecosystems and relate this to climate change, eutrophication and acidification. Fredrik Palm is carrying out his studies in Västra Götaland and Bohuslän, with a special focus on the Gårdsjön area in Ucklum. This region has been an important centre of Swedish acidification research for decades.

Contact:
Fredrik Palm, Department of Zoology, University of Gothenburg
Tel: 46 (0)31 786 3668
Mobile: 46 (0)703 756668
fredrik.palm@zool.gu.se
BY: Krister Svahn
46 (0)31 786 49 12
krister.svahn@scinece.gu.se

Helena Aaberg | idw
Further information:
http://www.gu.se/
http://www.science.gu.se/english/News/News_detail?contentId=878399

More articles from Ecology, The Environment and Conservation:

nachricht Joint research project on wastewater for reuse examines pond system in Namibia
19.12.2016 | Technische Universität Darmstadt

nachricht Scientists produce a new roadmap for guiding development & conservation in the Amazon
09.12.2016 | Wildlife Conservation Society

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: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Water - as the underlying driver of the Earth’s carbon cycle

17.01.2017 | Earth Sciences

Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

17.01.2017 | Materials Sciences

Smart homes will “LISTEN” to your voice

17.01.2017 | Architecture and Construction

VideoLinks
B2B-VideoLinks
More VideoLinks >>>