Scientists say new corals on Great Barrier Reef down by 89 percent

Unprecedented coral-bleaching events in 2016 and 2017 have led to the number of new corals on Australia's Great Barrier Reef dramatically declining by 89 percent, according to research carried out last year.

The cataclysmic events, which were widely reported to have damaged two-thirds of the world's largest reef system, are now being blamed for causing a serious collapse in coral re-growth through 2018.

The research, which has been published in the journal Nature, puts the core reason for the problems on rising sea temperatures. It measured how many adult corals along the length of the reef had survived the bleaching events – and then looked at the number of new corals that had been produced since then. It highlighted the link between coral vulnerability and sea temperatures going up as a result of global warming, and joined the rising number of groups calling for increased action to reduce carbon emissions on a global scale.

Coral bleaching is caused by rising temperatures and occurs when corals under stress drive out the algae – known as zooxanthellae – that give them their vibrant colour. If normal conditions return, the corals can recover, but even then it can take decades – and if the stress continues, the corals can die. As lead author Prof Terry Hughes, from Queensland’s James Cook University, explained: “Quite simply, dead corals don't make babies.”

Co-author Prof Andrew Baird continued: “Across the length of the Great Barrier Reef there was an average 90 percent decline from levels recorded in the 1990s, and we think this is down to the 2016/2017 bleaching events affecting 900 miles of the GBR.

“Baby corals can travel over vast distances, and if one reef is too far gone, there are usually enough adults on other reefs to protect the juveniles, but this monstrous mortality rate – what we think is the GBR’s first regrowth problem on such a massive scale – has meant that there’s nothing left to replenish the reef.

“Coral replenishment could recover over the next five to ten years – if there were no future bleaching events. Unfortunately, given current estimates, this likelihood is almost inconceivable.”

Prof Baird concluded: “We are at the point where localised solutions for the Great Barrier Reef are almost pointless – the only thing that matters now is positive global action on climate change.”

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YouTube Video UEw2X2VCMS1KYWdWbXFQSGV1YW84WVRHb2pFNkl3WlRSZS43RkJGOTAwRDhCOEQ1RjIy

Is This The Best Dive Center Ever? W\@wakatobidiveresort

@sennacher 
#askmark Hi there, regarding DSMBs. I’m no expert whatsoever and normally I deploy it correctly. This weekend we dove on very strong current and I almost lose my breath while deploying it (mouth inflate) as it tangled a bit on my reg. It scared the sh&t out of me so. Is there any “little cylinder” kind of thing in order to keep my reg in my mouth to deploy it safer?  I haven’t tried to do it with my LPI… but asume it would tangle also.
Thanks
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#askmark Hi there, regarding DSMBs. I’m no expert whatsoever and normally I deploy it correctly. This weekend we dove on very strong current and I almost lose my breath while deploying it (mouth inflate) as it tangled a bit on my reg. It scared the sh&t out of me so. Is there any “little cylinder” kind of thing in order to keep my reg in my mouth to deploy it safer? I haven’t tried to do it with my LPI… but asume it would tangle also.
Thanks
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Is There an Easier Way to Deploy a dSMB?

How Twinset Valves Work In Scuba Diving | Shutdown Drills And Isolator Tips Explained #scubadiving #askmark #twinset

Confused about how to use twinset valves or perform a proper valve shutdown drill? You’re not alone.

In this AskMark episode, Mark explains how valves work on twin cylinders, including how to safely open and close them, how isolator valves function, and why valve drills (also known as shutdown drills or V-Drills) are critical for diagnosing leaks during technical and recreational dives. Please visit our website for more Scuba news, underwater photography, hints & advice, and travel reports: https://divernet.com/ 

Mark also shares tips on muscle memory for reaching your left and right posts, isolator-first vs isolator-last logic, and how to prevent over-tightening or unsafe valve positioning. This guide is perfect for divers transitioning to twinsets, sidemount divers curious about manifold setups, or anyone wanting to improve their gas management skills. 

Let us know in the comments how your instructor taught valve drills and don’t forget to leave your questions using #AskMark to get featured in a future video. 

@mostafametwally1

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Disclaimer: The information in this video is not intended nor implied to be a substitute for professional SCUBA Training. This video's content, including text, graphics, images, and information, is for general information purposes only and does not replace training from a qualified Dive Instructor.

🔎 Related Phrases:

How Twinset Valves Work In Scuba Diving, Shutdown Drills And Isolator Tips Explained, How Twinset Valves Work In Diving, Scuba Valve Drill Tutorial, Shutdown Drill For Twin Cylinders, How To Use Twinset Isolator Valve, Twinset Manifold Explained, Best Way To Close Dive Valves, V-Drill For Scuba Divers, Twin Cylinder Gas Management Tips, Scuba Regulator Shutdown Steps, How To Practice Twinset Valve Drills, Muscle Memory For Valve Shutdowns

#scubadiving #askmark #twinset #scubavalves #shutdownskills #divingsafety #scubatraining #scubatech #divetips #manifoldvalve #valvedrill #scubagear #divingtechniques #scubacommunity #technicaldiving

How Do Valves Work on Twin Cylinders? #askmark
@mostafametwally1
#askmark hi Mark. Could you do a video on how to deal with the valves and manifold on twin cylinders. It’s confusing to remember which way to open the valves and it’s easy to get wrong particularly in emergencies. Thanks
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How Twinset Valves Work In Scuba Diving | Shutdown Drills And Isolator Tips Explained

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