Tuesday, August 25, 2015

Tioman Island & Snorkeling : Bleaching & Weather!

We have always been led to believe that bleaching of the world's coral reefs is final proof of global warming. Not quite according to the NOAA:
When corals are stressed by changes in conditions such as temperature, light, or nutrients, they expel the symbiotic algae living in their tissues, causing them to turn completely white.

Warmer water temperatures can result in coral bleaching. When water is too warm, corals will expel the algae (zooxanthellae) living in their tissues causing the coral to turn completely white. This is called coral bleaching. When a coral bleaches, it is not dead. Corals can survive a bleaching event, but they are under more stress and are subject to mortality.

In 2005, the U.S. lost half of its coral reefs in the Caribbean in one year due to a massive bleaching event. The warm waters centered around the northern Antilles near the Virgin Islands and Puerto Rico expanded southward. Comparison of satellite data from the previous 20 years confirmed that thermal stress from the 2005 event was greater than the previous 20 years combined.

Not all bleaching events are due to warm water.

In January 2010, cold water temperatures in the Florida Keys caused a coral bleaching event that resulted in some coral death. Water temperatures dropped 12.06 degrees Fahrenheit lower than the typical temperatures observed at this time of year. Researchers will evaluate if this cold-stress event will make corals more susceptible to disease in the same way that warmer waters impact corals.

These are doing fine at Tioman Island,  2.8167°N

All photos©2014 Am Ang Zhang

Medicine and Snorkelling: Think outside the box!

The first modern snorkel was invented by none other than Leonardo da Vinci, apparently at the request of the Venetian senate. It consisted of a hollow breathing tube attached to a diver's helmet of leather.

You may wonder why I wrote about snorkels in my book The Cockroach Catcher. The evolution of the snorkel tube makes me think about progress in medicine.

“... In those days we had snorkels that had a Ping Pong ball at the top end – a sort of umbrella handle at the top with the Ping PongBall inside a little cage so that it floated up to stop water coming in. ….

Imagine the shock when we went to the Great Barrier Reef and were given snorkels that bore no resemblance to the ones I used in my childhood. There was no Ping Pong ball in a cage and there was a drain at the bottom. The top was slightly curved with a clever design so that water from waves could not get in. Any water that managed to get in was drained away at the bottom. I looked at it and smiled. One must always question traditional beliefs. We can be blinded by what looks like a most sensible and reasonable approach – Ping Pong ball in a cage. ...

Medical Schools should remember to teach future doctors that without breaking rules and old dogma, no progress would ever be made in medicine....”
My Point is that doctors sometimes need to “think outside the box”.

Snorkelling is one of my favourite hobbies. I find it so relaxing and therapeutic. Slow breathing, say for 15 minutes a day, is now proven to help reduce blood pressure by a clinically significant amount. What better way to do it than in the sea, surrounded by fish and corals?                                                                                                                                                                       

Ideas without precedent are generally looked upon with disfavour
and men are shocked if their conceptions of an orderly world are challenged.
Bretz, J Harlen 1928.

The Cockroach Catcher on Amazon Kindle UKAmazon Kindle US                    

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