Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cod has a key role in the whole Baltic Sea

19.04.2012
A new investigation put in evidence the key role of cod as regulator of the whole Baltic Sea ecosystem.
The study shows that when the cod population in the central Baltic increases, it spreads into larger areas and spills over into adjacent marginal systems where it usually does not occur, as for example the Gulf of Riga.

On the other hand, when the cod population size in the central Baltic decreases, it concentrates into the southern Baltic Sea and disappears from the other systems where it cannot reproduce. Cod population size and spatial expansions/contractions in the Baltic landscape depend on fishing pressure and hydro-climatic conditions in the central Baltic that acts as source of cod for the more coastal and northern areas.

The presence/absence of cod in the Gulf of Riga impacts the whole local ecosystem, from the main pelagic fish, the herring, to the zooplankton and phytoplankton through a “trophic cascade”. The presence of cod in the Gulf of Riga can therefore decrease the intensity of the local algal blooms. However, other local factors also affect the Gulf of Riga ecosystem, as local fishing on cod and herring, temperature and river runoff transporting nutrients into the Gulf.

This study increases our knowledge on the predators’ effects on ecosystem structure, and stresses the importance of linking both local and regional processes for a full understanding of ecosystem functioning on a broader landscape scale. Investigations on the functional implications of cross-system fluxes of organisms are central in the management of exploited resources and ecosystem conservation.

SLU-researcher Michele Casini was the leader of the study in collaboration with other scientists from Sweden, Denmark, Latvia, Germany and Norway. The analysis is based on biological and hydrological data collected in the Baltic Sea during a 35-year period.

A new investigation put in evidence the key role of cod as regulator of the whole Baltic Sea ecosystem. Photo: Roger Jansson

The results of the study have been published early edition online in the scientific journal Proceedings of the National Academy of Sciences of the USA, 13 April 2012, with the title Predator transitory spillover induces trophic cascades in ecological sinks.

Contacts and more information:
Researcher Michele Casini: link to my SLU personal website:
http://www.slu.se/sv/fakulteter/akvatiska-resurser/organisation/personliga-sidor/michele-casini/
SLU, Department of Aquatic Resources, Institute of Marine Research, Lysekil.

Phone: +46 010-478 40 16, e-mail: michele.casini@slu.se

Mikael Propst | idw
Further information:
http://www.vr.se

Further reports about: Baltic Sea Gulf of Maine region SLU algal bloom cod stock population size sea snails

More articles from Ecology, The Environment and Conservation:

nachricht Dune ecosystem modelling
23.06.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau

nachricht Understanding animal social networks can aid wildlife conservation
23.06.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)

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: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Quantum thermometer or optical refrigerator?

23.06.2017 | Physics and Astronomy

A 100-year-old physics problem has been solved at EPFL

23.06.2017 | Physics and Astronomy

Equipping form with function

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>