sail-world.com
 
 
News Home Video Gallery Photo Gallery

 

Sail-World.com : Full moon sparks remarkable mass coral spawning

Full moon sparks remarkable mass coral spawning

One of the most spectacular natural events in Western Australia, the annual mass autumn spawning of corals, is predicted to occur off parts of the coast next week, between 27 and 30 March.

Department of Environment and Conservation Marine Science Program Leader Dr Chris Simpson said the event occurred in the Dampier Archipelago, Ningaloo Marine Park and Abrolhos Islands, over the period of the lowest tidal range, seven to ten nights after the full moon.

'This fascinating event in the coral reproductive cycle looks something like a pink, underwater snow storm and it attracts many divers and photographers each year,' Dr Simpson said.

'The coral spawning occurs at night, usually on an ebbing tide, beginning about an hour after sunset and continuing for two to three hours.

'Although most corals in WA spawn in autumn, a few species also spawn during spring, contrasting with the Great Barrier Reef where most corals spawn in spring/early summer.'

Dr Simpson said water temperatures along WA's coastline over the past few months had been unusually high, causing coral stress that results in coral bleaching and mortality if it persists.

'Bleaching has been recorded on many WA coral reefs in the past month, from the tropical north to the temperate coral reefs off Shark Bay and the Abrolhos Islands where it had not been previously observed,' he said.

'The higher than usual ocean temperatures are mainly due to the La Nina weather pattern which causes the Leeuwin Current to flow strongly along WA's coast bringing warm water further south than usual.

'La Nina is often also associated with calmer weather in WA, which reduces flushing of lagoon waters causing further warming of shallow, coastal waters by the sun.

'If calm conditions occur during the coral spawning period this year it will increase the risk of coral spawn slicks forming on the ocean surface reducing oxygen and causing mortality in coral, fish and other reef biota.'

Dr Simpson said these events had occurred several times on WA coral reefs in the past and were important natural disturbances on our reefs. He said coral spawn slicks were often confused with large algal blooms.

'These blooms are usually a reddish-brown in colour, earning them the name ‘red tide', and are often confused with the pink coral spawn which also floats on the sea surface.'

DEC is calling for people who see coral slicks, distressed, floating or washed up fish or bleached corals, to take photographs and record the time, date and location of these observations and pass this information onto their local DEC office.

'Public assistance will help us to better understand where these natural disturbances are occurring, which is likely to be in vulnerable areas like shallow, protected or semi-enclosed parts of bays and lagoons.'

Department of Environment and Conservation website




by Department of Environment and Conservation

  

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

http://www.sail-world.com/index.cfm?nid=81672

2:08 PM Thu 24 Mar 2011 GMT






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


News - USA and the World







HUD Vision: An interview with Afterguard Marine’s Alex Moret by David Schmidt, Sail-World USA Editor, Seattle














America's Cup: Expected de Ridder penalty should be reduced by Richard Gladwell/Sail-World.com/nz, Auckland, NZ


















Congressional Cup - Victory for Taylor Canfield and crew by Rich Roberts (As Amended by ISAF),




2014 Halifax – Saint-Pierre Ocean Race by Patricia Nelder, Nova Scotia














Image Gallery: Stratis SL33 flies on the Waitemata by Richard Gladwell,Sail-world.com/nz,


Audi Melges 20- Sperry Topsider Charleston Race Week - Light final day by International Audi Melges 20 Class Association,








Int 14 World Championships 2015 launch new event website
International Optimist Regatta Clinic and Team Race - Register now!
Congressional Cup: World top rankers finish that way in Long Beach
Sperry Top-Sider Charleston Race Week Day 3 finale
America's Cup: Gino Morrelli outlines the new AC62 design
Doyle Sails New Zealand signs Andrew Brown as One Design Manager
America's Cup: Dean Barker's Blog - A sail with the Duke and Duchess
29er World Youth Sailing Week Easter regatta - Day 1 and 2 overall
C Thomas Clagett Jr Memorial Clinic/Regatta - Entries start to roll in
50th Congressional Cup: See the delayed coverage and media conferences
Clipper Race 10 Day 27: Closing stages - Qingdao to San Francisco
Canfield, Williams, Bruni, Swinton in Congressional Cup final four
Sperry Top-Sider Charleston Race Week - Day 2
Audi Melges 20 Charleston Race Week - Perfect conditions in Charleston
Oyster Regatta Antigua - Full on ocean conditions for day 3
PWA World Tour - A taste of things to come at La Torche + Video
Women's International Match Racing Series kicks off in June
Melges 32 Audi Tron Sailing Series - Action shots by Max Ranchi
Clipper Round the World Yacht Race - Frustrating conditions
Man rescued after falling overboard in Pacific taken to hospital
Sperry Top-Sider Charleston Race Week 2014 - Youth leading Melges 20   
Congressional Cup - Canfield leads toward Congressional Cup sailoffs   
Sperry Top-Sider Charleston Race Week 2014 - Perfection for Day 1   
America's Cup: Coutts claims ISAF Jury on a crusade, backs Kiwi report   
Clipper Round the World Yacht Race - Will light winds hamper progress?   
Les Voiles de St. Barth - Preparing to rock Saint Barthélemy waters   
Clipper Round the World Race - OneDLL and Qingdao now in San Francisco   
America's Cup: Emirates Team NZ up against funding hurdle for year   
Melges 32 Sailing Series Napoli - Day 1 images by Stefano Gattini   
50th Congressional Cup: View the Live racing here   
Melges 32 Sailing Series - Napoli action shots by Max Ranchi   
Volvo Ocean Race - Team Alvimedica launch new boat   
Emirates Team NZ: Royals duke it out on the Waitemata   
2014 Charleston Race Week - Thousands of sailors descend on Charleston   
The Congressional Cup 2014 - Williams hangs on with a classy crowd   
50th Congressional Cup: View the Live racing here   
RORC Transatlantic Race - Notice of Race now available   
Oyster Regatta Antigua - Sunshine and smiles on day 2   
Rolex China Sea Race on the horizon   
What can a boat name tell you about the person behind the helm?   


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.
XL WAS US