Navigation Links
How fish species suffer as a result of warmer waters

Ongoing global climate change causes changes in the species composition of marine ecosystems, especially in shallow coastal oceans. This applies also to fish populations. Previous studies demonstrating a link between global warming and declining fish stocks were based entirely on statistical data. However, in order to estimate future changes, it is essential to develop a deeper understanding of the effect of water temperature on the biology of organisms under question. A new investigation, just published in the scientific journal Science, reveals that a warming induced deficiency in oxygen uptake and supply to tissues is the key factor limiting the stock size of a fish species under heat stress.

Scientists of the Alfred Wegener Institute for Polar and Marine Research in Bremerhaven investigated the relationship between seasonal water temperature and population density using eelpout (Zoarces viviparus), a fish species from the Southern North Sea. The goal of the study was to identify those physiological processes exhibiting the most immediate response to warming in the field. Comparing ecological field data with laboratory investigations of the eelpout's physiology, the authors were able, for the first time, to demonstrate a direct link between temperature dependent oxygen limitation experienced by the eelpouts and warming induced changes in their population density.

During evolution, animals have specialised on environmental conditions and are often very limited in their tolerance to environmental change. In this context, fish species from the North Sea which experience large seasonal temperature fluctuations, are more tolerant to higher temperatures and display wider thermal windows than, for instance, fishes from polar regions living at constant low temperatures. The latter are able to grow and reproduce only within a very limited thermal tolerance window.

Investigations at the Alfred Wegener Institute show the key importance of oxyge n uptake and distribution ?through respiration and blood circulation ?in setting the animals' thermal tolerance range, in that these processes are optimised to only a limited temperature window. With increasing temperature, the organism's oxygen supply is the first to deteriorate, followed by other biochemical stress responses. Finally, oxygen supply fails entirely, leaving the organism to perish. These results represent a significant step forward towards understanding the mechanisms involved in climate-induced alterations in marine ecosystems.

The paper 'Climate change affects marine fishes through the oxygen limitation of thermal tolerance' is published on January 5, 2007 in the scientific journal Science.
'"/>

Source:Alfred Wegener Institute for Polar and Marine Research


Related biology news :

1. New species from old data
2. Same mutation aided evolution in many fish species, Stanford study finds
3. Fibril Shape Is The Basis Of Prion Strains And Cross-species Prion Infection
4. Reservoirs may accelerate the spread of invasive aquatic species, researchers say
5. Small species back-up giant marsupial climate change extinction claim
6. Aggressive aquatic species invading Great Lakes
7. Bush, Cheney and Rumsfeld are now species of slime-mold beetles -- but strictly in homage
8. Internet viruses help ecologists control invasive species
9. An (ecological) origin of species for tropical reef fish
10. Ancient DNA helps clarify the origins of two extinct New World horse species
11. Invasive parasite destroying fish species

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/23/2016)... Massachusetts , March 23, 2016 /PRNewswire/ ... im Interesse erhöhter Sicherheit Gesichts- und Stimmerkennung ... Xura, Inc. (NASDAQ: MESG ), ... bekannt, dass das Unternehmen mit SpeechPro zusammenarbeitet, ... aus der Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, ...
(Date:3/18/2016)... LONDON , March 18, 2016 ... Established Suppliers of Biometrics, ICT, Manned & Unmanned Vehicles, Physical ... & security companies in the border security market and ... and Europe has led ... your companies improved success. --> defence & ...
(Date:3/14/2016)... 2016 NXTD ) ("NXT-ID" or the ... announces the airing of a new series of commercials on ... March 21 st .  The commercials will air on Bloomberg ... on the Street show. --> NXTD ) ("NXT-ID" ... commerce market, announces the airing of a new series of ...
Breaking Biology News(10 mins):
(Date:5/27/2016)... -- At present, the Biotech sphere is in ... that volatility is what makes this industry interesting to consider. ... Corp. (NASDAQ: SNTA ), CTI BioPharma Corp. (NASDAQ: ... ), and Heat Biologics Inc. (NASDAQ: HTBX ). ... for these stocks at: http://www.activewallst.com/register/ ...
(Date:5/26/2016)... ... May 26, 2016 , ... ... Medistem Panama Inc. at the City of Knowledge in Panama, a 6 ... cells in the US earlier this year following FDA approval of a second ...
(Date:5/25/2016)... ... May 25, 2016 , ... ... of fracture-specific plating options designed to address fractures of the distal tibia and ... , The Acumed Ankle Plating System 3 is composed of seven plate families ...
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... Lady had ... she tore her cruciate ligament in her left knee. Lady’s owner Hannah sought the ... central Florida board-certified veterinary surgeon, to repair her cruciate ligament and help with the ...
Breaking Biology Technology: