Featured Research

from universities, journals, and other organizations

How Fish Species Suffer As A Result Of Warmer Waters

Date:
January 9, 2007
Source:
Alfred Wegener Institute for Polar and Marine Research
Summary:
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.

The eelpout (Zoarces vivparus).
Credit: Alfred Wegener Institute

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 oxygen 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.


Story Source:

The above story is based on materials provided by Alfred Wegener Institute for Polar and Marine Research. Note: Materials may be edited for content and length.


Cite This Page:

Alfred Wegener Institute for Polar and Marine Research. "How Fish Species Suffer As A Result Of Warmer Waters." ScienceDaily. ScienceDaily, 9 January 2007. <www.sciencedaily.com/releases/2007/01/070104144845.htm>.
Alfred Wegener Institute for Polar and Marine Research. (2007, January 9). How Fish Species Suffer As A Result Of Warmer Waters. ScienceDaily. Retrieved April 16, 2014 from www.sciencedaily.com/releases/2007/01/070104144845.htm
Alfred Wegener Institute for Polar and Marine Research. "How Fish Species Suffer As A Result Of Warmer Waters." ScienceDaily. www.sciencedaily.com/releases/2007/01/070104144845.htm (accessed April 16, 2014).

Share This



More Plants & Animals News

Wednesday, April 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola Outbreak Now Linked To 121 Deaths

Ebola Outbreak Now Linked To 121 Deaths

Newsy (Apr. 15, 2014) The ebola virus outbreak in West Africa is now linked to 121 deaths. Health officials fear the virus will continue to spread in urban areas. Video provided by Newsy
Powered by NewsLook.com
In Washington, a Push to Sterilize Stray Cats

In Washington, a Push to Sterilize Stray Cats

AFP (Apr. 14, 2014) To curb the growing numbers of feral cats in the US capital, the Washington Humane Society is encouraging residents to set traps and bring the animals to a sterilization clinic, after which they are released.. Duration: 02:29 Video provided by AFP
Powered by NewsLook.com
After Attack, Officials Kill 5 Bears in Florida

After Attack, Officials Kill 5 Bears in Florida

AP (Apr. 14, 2014) Florida wildlife officials say they have killed five bears following an attack on a woman in a suburban subdivision in central Florida. Forty-five year-old Terri Frana was attacked by a large bear in her driveway Saturday. (April 14) Video provided by AP
Powered by NewsLook.com
Uruguay Opens Its First Cannabis Library

Uruguay Opens Its First Cannabis Library

AFP (Apr. 13, 2014) Uruguay opened its first Cannabis Library in Montevideo on Saturday, where people can come and read books on cannabis or take classes on how to grow the plant or even how to cook with it. Duration: 01:20 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins