>
 
> FishingBoating-World.com
 
 
News Home Newsletters Photo Gallery Powerboat-World Australian Cruising World Cruising MarineBusiness-World Animated Knots
Video Gallery MarineBusiness-World
Sail-World.com : Missing link of how fishes triumphed over toxic oceans revealed
Missing link of how fishes triumphed over toxic oceans revealed


'How fish won the oxygen war'    Jodie Rummer
An international team of scientists have revealed a missing link in the story of how the fishes triumphed over toxic oceans and past climate changes.

The key to the evolutionary success of fish – and their possible survival in future – may lie with a molecule that they ultimately bequeathed to humans: hemoglobin, the precious carrier of oxygen into our brain, heart, muscles and other organs.

In a paper in the latest edition of the journal Science, Dr Jodie Rummer of the ARC Centre of Excellence for Coral Reef Studies and colleagues from the University of British Columbia report a groundbreaking discovery about how fish manage to survive in hostile water conditions.

'Four hundred million years ago the oceans were not what they are today. They were low in oxygen, high in CO2 and acidic,' says Dr Rummer. 'Yet the fishes not only survived in these unpromising circumstances, they managed to thrive. Their secret weapon was a system for unloading huge amounts of oxygen from the hemoglobin in their blood, whenever the going got really tough.

'Hemoglobin in the blood takes up oxygen in the gills of fish and the lungs of humans. It then carries it round the body to the heart, muscles and organs until it encounters tissues that are highly active and producing a lot of CO2.' 'The acid is a signal to the hemoglobin to unload as much of its oxygen as possible into the tissues,' she explains.

'These early fish managed to develop a way to maximize the delivery of oxygen, even when the water they lived in was low in it. They had a phenomenal capacity for releasing oxygen just when needed: it was one of the big secrets of their evolutionary success, to the extent they now make up half the vertebrates on the planet.'

The fishes’ oxygen release system became even more efficient over the ensuing 150-270 million years, when it was necessary to deliver large amounts to organs such as the eye – which requires very large O2 loads to function well and avoid vision cell death – and which was essential to seeing clearly under water, to hunt or avoid predators.

The researchers made their discovery by deciphering the biochemistry of how rainbow trout manage to rapidly double oxygen release in certain tissues, when they swim in waters that cause them stress.

The fish system is many times more efficient than the one inherited by humans (as our amphibian ancestors branched away from higher fishes around 350-400my ago when the hemoglobin system was still in its early stages of development), but its discovery may lead to new ways of understanding and tackling conditions influenced by oxygen levels in the body.

'Also, we feel that if we can understand how fish coped with low-oxygen, high CO2, acidic waters in the past, it will give us some insight into how they might cope with man-made climate change which appears to be giving rise to such conditions again,' Dr Rummer says.


by ARC Centre of Excellence

  

Click on the FB Like link to post this story to your FB wall

http://www.fishingboating-world.com/index.cfm?nid=110995

9:20 AM Wed 19 Jun 2013GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.







FishingBoating-World

A Mooring in Iceberg Alley by Rebecca Jackson,






Predictwind helps you pick the best time to depart by Richard Gladwell Sail-World.com/nz,
































Dispersant from Deepwater Horizon Spill persist in environment by Woods Hole Oceanographic Institution,






Understanding the Ocean's role in Greenland Glacier melt by Woods Hole Oceanographic Institution (WHOI),


Dangerous conditions for boating on entire NSW Coast by Transport Roads and Maritme Services,
















Baby Nemos finding their way home by ARC Centre of Excellence Coral Reef Studies,




Dangerous conditions forecast for NSW boaters
New fishing pontoons for Warrnambool’s Merri river
Whale freed from rope at Byron Bay
Tidal current installations will increase boating hazards
Dangerous conditions for NSW coastal boaters from Thursday
Bar Crusher's fully-enclosed fishing weapons
World premieres and national debuts for Sydney International Boat Show
Marine Auctions experiencing rising tide of interest *Feature
Man fined $2000 for hawking abalone from an East Gippsland reef
New catfish species ‘hooked’ in North Qld
Emperor penguins in danger of dramatic declines
Tags reveal Chilean devil rays are among ocean's deepest divers
Auckland On Water Boat Show to hold world record attempt
Alvin's Animals - Previously unknown species discovered
Zodiac at Sydney International Boat Show 2014 – Australian
Gold Coast International Marine Expo - Exhibitor space filling fast
Lessons from the West: Great Barrier Reef in danger
If we stop killing parrotfish we can bring back Caribbean coral reefs
Decade of benefits for the Great Barrier Reef
Climate change could stop fish finding their friends
Ceramic coated exhaust manifolds reduce engine bay temps on superboat   
Reminder of safe distance requirements for whales   
Changes to Australian bass closed season   
Commercial fishers on shore for mullet season   
Management measures implemented to reduce large whale entanglements   
Scientists use JeDI to create world’s first global jellyfish database   
Sanctuary Classic off to a great start!   
New Murray cod limits proposed to improve fishery   
Up close and personal with whales on the Gold Coast   
SA Marina Day encourages South Australians to enjoy their marinas   
Southport Yacht Club raffle: Dusit Thani, BRIG Falcon, Marriott stay   
Fish stocks Northeast Atlantic recover, overfishing in Mediterranean   
Enjoy the whale spectacle, just keep your distance   
Satellite images reveals emperor penguins are more willing to relocate   
Whale research - new techniques expand for non-lethal methods   
The Dinghy Nav Light Solution- a brilliantly dumb idea   
Extension granted for salvage of a paddle steamer on the Murray River   
Spike in water temperatures evidence of ‘irreversible’ El Nino *Feature   
Third CYCA Solas Trusts grant to Australian Volunteer Coast Guard   
Severe weather warnings prompt reminder to boat owners   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL WAS FBW
LocalAds   DE  ES  FR  IT