Coral gets its color from algae called zooxanthellae, which it depends on for photosynthesis.
Bleaching is actually due to the coral expelling those algae. Bleached corals are not dead, and remarkably they can not only let the algae in again but can also select a different algae species to cultivate (changing colour in the process)!.
This is thought to be a deliberate survival strategy to optimize the species of algae under different conditions (Adaptive Bleaching Hypothesis).
Bleaching is caused by the same stressors (like high temperature) which kill coral, but bleaching itself is not death of the coral.
Of note: This only occurred for fragments taken from an individual of the same genetic makeup(genet: basic meaning is they are a colony).
I find it strange that the first observance of this was a year ago, especially given how rapidly it occurs. Coral bleaching has probably been studied since the 80s when major events started being noticed. If Stephen Palumbi is reading this, I would love to read why you think it took so long.
edit: I would wager this is only the first published observance.
I remember hearing that the concern with our best techniques for rescuing coral reefs is that they would create a monoculture, and monocultures tend to be very susceptible to specific diseases.
Having been a diver on the Great Barrier Reef numerous times, the scale of bleaching events means that there is often no non-bleached neighbour for vast distances. Healthy propagation rarely occurs before the brown sludge sets in, then its game over.
This kills me. I saw the reef for the first time around 2007. I went back twice, and the last time I was there (2017) I honestly couldn't believe what I saw. Wasteland? An under water desert? I don't have words for it, but I don't really want to go back because it hit me so hard. Our planet is dying and we're sitting here debating why/who and not doing anywhere near enough to fix it.
I'm so glad we have space rockets, flying cars and drone warfare...but I'd trade it all in for the reef to come back.
> I'm so glad we have space rockets, flying cars and drone warfare...but I'd trade it all in for the reef to come back.
It's really just climate change. (Ocean warming is what causes bleaching.) Luckily, since the 80s we've had the technology to generate energy without releasing greenhouse gases. I wish more people knew about the harms caused by climate change because maybe if they were they'd be more interested in preventing them.
I feel like the harms were really drilled into Millennials like myself but then we seem to have assumed that younger Gen Zs and gen Alpha will just receive the climate change wisdom via osmosis or maybe if we're lucky, their parents. I've seen more people worrying about under-population (under population! Remember over-population?) than the environment recently. Maybe we need to bring Captain Planet back.
You don't have to trust a kids' show, that's just to help build general awareness. The proof is clear enough in rising CO2 levels, global average temperatures, ocean heat content etc.
Well, it's not the space rockets etc. that do this. It's the single-family homes with large yards with no apartment buildings nearby, and the ability to not look at wind turbines, and the community that we have managed to cultivate by living in our own detached homes. The things you have to trade to get the reef back are not usually the things you want to trade. Otherwise, we could happily trade those things. It's not like there are that many people making space rockets, after all. The hard part is giving up the things you want, like personal delivery food or a large car with a big road that has no traffic, or a large yard that you water, or living in the forest with two day delivery.
That's horrifying to hear. I also went on a multi day dive trip at gbr and the coral sea in 2007 and it was spectacular; I can't imagine going back and seeing it degraded.
> Our planet is dying and we're sitting here debating why/who and not doing anywhere near enough to fix it.
If only we were just debating why/who! Thanks to Social Media, filter bubbles, and “alternative facts,” we are back to debating whether it is actually even happening or not.
Happy to report the northern and central GBR coral cover is currently higher than any time measured before 2020. Southern is currently below its long-term average, but 2024 was a record high in coral cover.
Not necessarily but they do measure diversity too, and it has not changed dramatically.
Typically the biggest change in diversity is due to cyclones which kill of the delicate and fast-growing corals like staghorns, which are also the fastest to grow back.
Wow, I wasn’t aware of this. I’ve always read climate change as the primary driver for bleaching. If that is the case, do we know why/how they’ve recovered?
Corals are killed en masse by other events, particularly cyclones. These have a much bigger affect on coral coverage, in the short term, than ocean temperatures / bleaching (which is transient and more localized).
Bleaching is not death of the coral, it is the expulsion of algae (typically in high temperatures). The coral can find a different species of algae, or the algae can return once temperatures drop.
There are corals living in regions of the ocean with different temperatures, so it is not that high temperature alone would kill all coral, but populations adapted to a given region (like north vs south GBR) are being affected by the speed of the changes.
How many humans are worth restoring the coral reef?
Because it’s nice to say these things in Sentiment, until you see past the naïveté to see human lives are what cause the wear and extraction on the environment. Humans live, eat, shit in, consume their environment for their lives.
How many humans are worth restoring the reef for you? And would you sacrifice your own friends and family?
You don’t need to sacrifice humans, you need humans to behave different. Do you know the energy requirements that go into war? The chemical, carbon and physical changes to the ocean from all we do?
We don’t need to kill more humans, we just need to stop being fucking idiots for a few hundred years.
High temperatures affect the algae itself. Transferring the algae to another live coral (bleached coral is alive) a) already happens in nature, if conditions return to normal b) does not protect the algae
> Fragments from different species and even different animals of the same species did not fuse together, and so did not nurse the bleached piece back to health.
Sounds like a solution is still well within our reach. Normally I wouldn’t suggest something as extreme as using cloning techniques to restore wild creatures, but of course it was extreme actions that got us here in the first place, so I think this balances it out.
Since you mentioned you’re still finding your way in life: please be aware that the appeal of a lot of new age and „woo“ is that the act of noticing a pattern in nature, that feeling of „aaah NOW it makes sense“ is inherently pleasant and can become something you chase like a drug. These frameworks or schools of thought can provide a steady source of that feeling without necessarily being tethered to reality at all. Kind of like acid - very fun at times but catastrophic if you make it a core part of your identity.
Slightly Related: Beware any community which insists you show "loyalty" by doing things that burn-bridges so that nobody else will be your friend. Trapping you is how cults and abusive-relationships work.
Why would the frequency of the healthy one win over the frequency of the non-healthy one though? I assume both would have their own frequencies, are you implying there's an order or tendency across frequencies?
My interpretation is “Programming in their nature” -> their being, meaning the molecular structure that defines them, is a program, a complex program, one executed by the interpreter that is physics.
Not the person you are replying to. I guess they feel somewhat humiliated. There can sometimes be a fine line between scientific curiosity and the appearance of bullying. Common courtesy suggests we should back off whenever we feel that might be applicable.
You might be interested in Catholic theology + philosophy. It takes a LOT of background, and a lot of time to accumulate it, but you clearly have some already, and once you get comfortable with reframing terms that have a lot of societal baggage attached to simpler, honest understandings (for example, God, as a sky dude vs the universe as a mind), you can go so far.
Bleaching is actually due to the coral expelling those algae. Bleached corals are not dead, and remarkably they can not only let the algae in again but can also select a different algae species to cultivate (changing colour in the process)!.
This is thought to be a deliberate survival strategy to optimize the species of algae under different conditions (Adaptive Bleaching Hypothesis).
Bleaching is caused by the same stressors (like high temperature) which kill coral, but bleaching itself is not death of the coral.
I find it strange that the first observance of this was a year ago, especially given how rapidly it occurs. Coral bleaching has probably been studied since the 80s when major events started being noticed. If Stephen Palumbi is reading this, I would love to read why you think it took so long.
edit: I would wager this is only the first published observance.
Only if you've never talked to anyone remotely involved with propagating coral, including those in the saltwater fish-tank community!
I'm so glad we have space rockets, flying cars and drone warfare...but I'd trade it all in for the reef to come back.
It's really just climate change. (Ocean warming is what causes bleaching.) Luckily, since the 80s we've had the technology to generate energy without releasing greenhouse gases. I wish more people knew about the harms caused by climate change because maybe if they were they'd be more interested in preventing them.
The power is yours.
If only we were just debating why/who! Thanks to Social Media, filter bubbles, and “alternative facts,” we are back to debating whether it is actually even happening or not.
https://www.aims.gov.au/monitoring-great-barrier-reef/gbr-co...
This doesn't mean everything is fine, but it is doing way better than 2017.
Was in central GBR this year, can't say I'm super impressed but not sure how I should set my expectation
Typically the biggest change in diversity is due to cyclones which kill of the delicate and fast-growing corals like staghorns, which are also the fastest to grow back.
Bleaching is not death of the coral, it is the expulsion of algae (typically in high temperatures). The coral can find a different species of algae, or the algae can return once temperatures drop.
There are corals living in regions of the ocean with different temperatures, so it is not that high temperature alone would kill all coral, but populations adapted to a given region (like north vs south GBR) are being affected by the speed of the changes.
Because it’s nice to say these things in Sentiment, until you see past the naïveté to see human lives are what cause the wear and extraction on the environment. Humans live, eat, shit in, consume their environment for their lives.
How many humans are worth restoring the reef for you? And would you sacrifice your own friends and family?
You don’t need to sacrifice humans, you need humans to behave different. Do you know the energy requirements that go into war? The chemical, carbon and physical changes to the ocean from all we do?
We don’t need to kill more humans, we just need to stop being fucking idiots for a few hundred years.
Edit - The article makes Okkef's point, I just missed it.
> Fragments from different species and even different animals of the same species did not fuse together, and so did not nurse the bleached piece back to health.
Conways game of life.
More intelligent individuals should look more into this field.
New age movement, claim everything on earth is actually a hologram of the universe, experiencing itself.
So perhaps, just being in close proximity with another coral, the hologram frequency was now more in tuned.
I am just glad coral can repair themselves.
Thumbs up to the researcher.
Cells are complex organisms and contain programming in their nature so we can more easily trace and understand its reasons
A frequency is something a lot more raw than a cell
"programming in their nature" means they have a range of frequency, like a radio? perharps.
Nevertheless, thumbs up to the researcher. Positive vibes.
Do you believe only experts can contribute to discussions and ideas? Are you afraid of sounding "dumb"?
No question/idea is stupid and it's okay to be wrong or to learn something by putting yourself out there!