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#1372828 - 12/04/2016 11:24 Re: Coral Bleaching [Re: Ronfishes]
desieboy Offline
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Registered: 31/12/2002
Posts: 2966
Loc: Broome

Yes nice spot Pops so colourful and seen lots of sealife including Blue Rings Occis and some beautiful colourful different types of Nudibranchs ...

If wide scale coral bleaching occurring locally should be pretty apparent in these locations first you would think..
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Climate is what we expect, weather is what we get.
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#1372829 - 12/04/2016 11:29 Re: Coral Bleaching [Re: Ronfishes]
desieboy Offline
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Registered: 31/12/2002
Posts: 2966
Loc: Broome


Yes Pops nice reef along that area wish I had a camera like you to get those real you beaut pics especially considering it is so colourful.
Have seen lots Nudibranches in different colours ,blue rings ,and so many tropical fishes etc on the low tide.

You would think if coral bleaching was happening wide scale locally these areas would be the first to show it up.
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Climate is what we expect, weather is what we get.
- Mark Twain

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#1373192 - 16/04/2016 13:15 Re: Coral Bleaching [Re: Ronfishes]
desieboy Offline
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Registered: 31/12/2002
Posts: 2966
Loc: Broome

Interesting article

W.A Coral Bleaching
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Climate is what we expect, weather is what we get.
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#1373221 - 17/04/2016 08:38 Re: Coral Bleaching [Re: Ronfishes]
Locke Offline
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Registered: 27/12/2007
Posts: 4226
Loc: Brisbane
Here's a photo taken at Three Sisters off Cairns on the trip I did with Pro Dive last month.

As posted previously, although I saw some bleaching on this trip, it was a long way from being a wasteland. Doing the far northern reef later in the year and will post some photos after that trip where I expect to see more extensive bleaching than off Cairns.


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#1373276 - 17/04/2016 17:02 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
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Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
Great pic Locke
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MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

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#1373372 - 18/04/2016 20:47 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
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Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
Not much we haven't already heard (warning, may mention the unmentionable):

https://youtu.be/PoO9uWg5p4I

Will be interesting when you head up later in the year Locke, see how much recovery is or isn't occurring.
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

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#1373468 - 20/04/2016 08:18 Re: Coral Bleaching [Re: Ronfishes]
Locke Offline
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Registered: 27/12/2007
Posts: 4226
Loc: Brisbane
Provided the whole reef isn't inexplicable wiped out in 1 go by an extremely unlikely single catastrophic event, then its remarkable ability to recover will always ensure that medimum term climate influences such as the 1 in 15-18 yr strong El Nino like the one we just had will never spell doom for the reef.

Just as the bush always grows back after a bushfire so will the reef grow back after a cyclone, crown of thorns attack or coral bleaching event.

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#1373505 - 20/04/2016 15:55 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
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Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
Yeah. Nah. This is an unprecedented event. The question is whether the areas affected will recover before the next cyclone, crown of thorns outbreak or bleaching event.

http://www.sciencemag.org/news/2016/04/survey-confirms-worst-ever-coral-bleaching-great-barrier-reef
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

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#1373506 - 20/04/2016 16:09 Re: Coral Bleaching [Re: Ronfishes]
Locke Offline
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Registered: 27/12/2007
Posts: 4226
Loc: Brisbane
Unprecedented in an era where we've only had 2 strong El Nino events spaced 17 years apart is a very subjective word.

Sure the Northern section of the reef has been hit very hard and may well take a decade to recover, but your talking about a reef system over 2000km which a large portion of which has not been severely bleached.

Severe tropical cyclones wipe out entire sections of reef which still manage to subsequently recover. The odds of a severe tropical cyclone hitting a particular section of reef are surprisingly small and I'd be very surprised to see a crown of thorns outbreak on a section of reef 95% bleached.

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#1373510 - 20/04/2016 16:52 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
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Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
200 year old corals do not recover in a decade or two.
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

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#1373513 - 20/04/2016 16:58 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
[uhn-pres-i-den-tid]
adjective
1.
without previous instance; never before known or experienced; unexampled or unparalleled:
an unprecedented event.
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

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#1373517 - 20/04/2016 17:28 Re: Coral Bleaching [Re: Ronfishes]
Locke Offline
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Registered: 27/12/2007
Posts: 4226
Loc: Brisbane
I would suspect multiple trees of age greater than 200 years are destroyed by weather events each year.

In Brisbane in 2011, the floods had destroyed a 200 year old tree at a camping ground I visited afterwards as well as a number of others along the river bank. I don't recall anyone suggesting at that point that the camp grounds would never recover.

Recovery of the reefs is not dependent on the replacement of a single 200 year old piece of coral. The great barrier reef has been present for over 10,000 years. In its history coral formations of a variety of ages have no doubt come and gone destroyed by cyclones and previous bleaching events. Very old pieces of coral have been destroyed by natural events previously and yet they still exist on the reef aas evidenced by the presence of a 200 year old piece of coral destroyed by the current El Nino.

I'm not downplaying the magnitude of the current event. I've been diving the reef since 2002 and the extent of the bleaching off cairns was certainly greater than I've previously seen. But when trying to establish how it will recover in the years to come I think some of the reports have been far too pessimistic and underestimate the capacity of the reef to restore itself.

One of the most laughable things was this morning on Channel 9 news, Karl Stefanovic showing a piece of footage of what must have been a severely bleached far northern section of the reef and suggesting that this is what visitors to Cairns would see now when they went out to the reef. Utter BS and certainly not representative of what I saw on my trip in late March.

Anyways, I'll have a better idea of where things really stand when I see the Northern reefs for myself at the end of the year.

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#1373538 - 20/04/2016 22:13 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
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Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
You are generalizing and comparing apples with echidnas mate. We'd be fairly lucky if in the northern 1000km of reportedly severely bleached coral had one single 200 yr old lump of coral die. Nothing like a native forest that has evolved with fire for at least 50,000 years.

Admittedly we have not got much of a history for these events.
http://www.aims.gov.au/docs/research/climate-change/coral-bleaching/bleaching-events.html

Yes these areas may recover, but with faster growing corals. As these events inevitably become more severe and frequent it may result in decreased biodiversity as slower growing corals lose out to these faster growing species. Just my thoughts. Modern day evolution..

And for the love of whatever man, never speak of Karl Stefanovic again!
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

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#1373549 - 21/04/2016 08:11 Re: Coral Bleaching [Re: Ronfishes]
Locke Offline
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Registered: 27/12/2007
Posts: 4226
Loc: Brisbane
Originally Posted By: Ronfishes
You are generalizing and comparing apples with echidnas mate. We'd be fairly lucky if in the northern 1000km of reportedly severely bleached coral had one single 200 yr old lump of coral die. Nothing like a native forest that has evolved with fire for at least 50,000 years.

Admittedly we have not got much of a history for these events.
http://www.aims.gov.au/docs/research/climate-change/coral-bleaching/bleaching-events.html

Yes these areas may recover, but with faster growing corals. As these events inevitably become more severe and frequent it may result in decreased biodiversity as slower growing corals lose out to these faster growing species. Just my thoughts. Modern day evolution..

And for the love of whatever man, never speak of Karl Stefanovic again!


If these events become more severe then the reefs will have less time to recover. But that's a very big if without getting further into forbidden topics.

The point I was trying to make was natural events take out long lived natural flora and fauna on a regular basis somewhere on this planet but where conditions remain conducive regrowth always occurs. The wreck of Yongala is a classic example of this. Put some structure in favorable conditions in tropical or sub-tropical waters and you'll get coral growth.

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#1373586 - 21/04/2016 15:26 Re: Coral Bleaching [Re: Ronfishes]
desieboy Offline
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Registered: 31/12/2002
Posts: 2966
Loc: Broome

Not saying I totally believe all of this but the author has some pretty good credentials ."Professor Ove Hoegh-Guldberg of the University of Queensland, who has studied coral for over three decades."

50% of reef dead...
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Climate is what we expect, weather is what we get.
- Mark Twain

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#1373590 - 21/04/2016 16:48 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale

I read somewhere that its possible that 50% of the badly affected Northern 1000km may die. They may have decided to clickbait the heading a little lol.

Still, 50% of almost 50% of the reef...
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

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#1373600 - 21/04/2016 18:21 Re: Coral Bleaching [Re: Ronfishes]
scott12 Offline
Weather Freak

Registered: 10/11/2015
Posts: 628
Loc: maadi Tully area
RF,When I was in High school in the 80's "they" also told me that the Amazon would be cleared by the year 2000..when I spent 6 months exploring the place in '95 I found that I'd probably need a few more lifetimes to actually see a fraction of what was remaining..

What I've learnt is that "they" have their own agendas and that often has very little basis in reality..

I've got half a dozen tanks filled and cant wait to get out get in the water and take a look, if these horrible winds ever stop...I'll try and take some footage as well..

Just remember that bleached coral is not dead coral.

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#1373610 - 21/04/2016 20:24 Re: Coral Bleaching [Re: Ronfishes]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3108
Loc: Gordonvale
These 'they' you speak of Pogo, I'm guessing they're the ones that post facebook memes with not a reference or statistic in sight? Different to a scientist with aerial, underwater surveys and historical data? I'm not sure what their agenda may be they are already getting paid.

Just because the Amazon is massive does not mean it isn't getting smaller. I am not a pessimist, just a realist. Just because the most popular dive spots around Cairns are marginally affected does not mean the northern section is not in a bad way. I could make up a statistic like: 99% of people will never see it, so I'll just say most people won't get to see it. So it is good that people like Locke will get a look and be able to pass on real info a bit further on.

These horrible winds and cloud cover are probably the best thing that could of happened lol.
_________________________
MTD: 60.6mm
2016-2017 wet season: 1187.6mm
YTD: 1071.2mm

Opinion is not fact.

Top
#1373616 - 21/04/2016 21:22 Re: Coral Bleaching [Re: Ronfishes]
scott12 Offline
Weather Freak

Registered: 10/11/2015
Posts: 628
Loc: maadi Tully area
Unfortunately Ron all the planets resources will continue to dwindle and die as the worlds population and rampant worship of consumerism increases.. even people who think they are nature lovers are part of the problem...

http://news.nationalgeographic.com/news/2008/01/080129-sunscreen-coral.html

The best solution may be an event that wipes away 90% of the worlds population...

I'll get back to you on this coral bleaching once I've had a chance to check it out for myself..I've seen a pretty amazing recovery after the 2 big cyclones in the last 10 years and the incredible damage from those cant be compared to bleaching..

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#1373623 - 21/04/2016 23:32 Re: Coral Bleaching [Re: Ronfishes]
Locke Offline
Weatherzone Addict

Registered: 27/12/2007
Posts: 4226
Loc: Brisbane
Only the Northern part of the reef upwards has a 50% coral mortality rate I dived off Cairns very recently and would estimate no more than 20% of that section bleached.

Professor Ove Hoegh-Guldberg is absolutely full of crap or being misquoted. (I'm inclined to think full of crap given his track record of outlandish predictions of doom for the reef over the past decade).

When he says

“Dive teams have been looking at sample locations and are seeing well over 50 percent coral deaths.”

What he means is "dive teams have looked at a hand picked sample of the worst sections of the reef".

Currently at worst only a 500km section of the reef from Lizard Island upwards (repesenting less than a quarter of the reefs entire length of 2,300km) is severely bleached in the manner he has suggested. But then he's been quoting sensational headlines for over a decade and has never been called out on it.

Here is a NOAA site that presents data from Virtual stations on the reef. I'd pay more attention to that than Professor Ove.

http://coralreefwatch.noaa.gov/satellite/vs/greatbarrierreef.php#SassieReef_GBR

Anyway, the pictures I post here at the end taken from the Northern end of the reef year will give you a true indication of just how bad the situation is.

If they show total devastation in the manner Professor Ove has described I will be the first to admit I was wrong but I doubt that will be the case.



Edited by Locke (21/04/2016 23:34)

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