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Scientists Confirm Life Under Antarctic Ice
MikeChino writes A new paper by a group of researchers from Montana State University confirms that life can survive under antarctic ice. Researchers led by John Priscu drilled down into the West Antarctic Ice Sheet and pulled up organisms called Archaea. These organisms survive by converting methane into energy, enabling them to survive where there is no wind or sunlight, buried deep under the ice.
Slashdot office?
They better not stir them up
putting the 'B' in LGBTQ+
What surprises me is the "the source of the ammonium and methane is most likely from the breakdown of organic matter that was deposited in the area hundreds of thousands of years ago when Antarctica was warmer and the sea inundated West Antarctica." part.
If the methane was already readily available, why didn't the organisms multiply to use up the methane faster?
I guess some organism breaks down the organic matter to methane and thereby limits the availability for the methane eating organism. But over the course of a hundred thousand years I feel that such a limited ecosystem should have exhausted the resources long ago.
What is the limiting factor that prevents this?
Ob H.P. Lovecraft
What surprises me is the "the source of the ammonium and methane is most likely from the breakdown of organic matter that was deposited in the area hundreds of thousands of years ago when Antarctica was warmer and the sea inundated West Antarctica." part. If the methane was already readily available, why didn't the organisms multiply to use up the methane faster? I guess some organism breaks down the organic matter to methane and thereby limits the availability for the methane eating organism. But over the course of a hundred thousand years I feel that such a limited ecosystem should have exhausted the resources long ago. What is the limiting factor that prevents this?
I guess everything is really slow because of the cold temperature. It would be nice to have a comment from someone that knows about this type of ecosystem.
"These organisms survive by converting methane into energy, enabling them to survive where there is no wind or sunlight..."
I convert methane into something...worse.
I've calculated my velocity with such exquisite precision that I have no idea where I am.
Researchers led by John Priscu drilled down into the West Antarctic Ice Sheet and pulled up organisms called Archaea
Were they called this before we pulled them up?
Did they tell us they were called Archaea?
I wonder if similar critters could survive in the liquid methane lakes and rivers of Titan ?
Maybe we deserve this world ?
Life is created under ideal conditions then it evolves to survive in harsh environments. Certainly I would prefer to believe that the opposite is true, but the evidence presented so far does not support that.
Time is what keeps everything from happening all at once.
I wonder if similar critters could survive in the liquid methane lakes and rivers of Titan ?
So far there is nothing to stop organism to form under the methane sea of Titan to take advantage of the vast quantity of ready-made energy supply over there
Thick ice sheet. Abundance of methane.
This recalls me some Saturn and Jupiter moon.
As well as a few comets and asteroids...
These organisms survive by converting methane into energy, enabling them to survive where there is no wind or sunlight, buried deep under the ice.
Whats producing the methane?
Finally a pet that can survive on farts!
The "butterfly collectors" are surprised again ... well some are. The others are getting used to the idea that they really have no clue about where and how life can exist.
"Consensus" in science is _always_ a political construct.
The case for life in the oceans which appear to exist below the ice crust of Europa just got a little stronger.
I see that nobody has asked the really important question.
How do they taste?
"The price good men pay for indifference to public affairs is to be ruled by evil men." ~Plato (427-347 BC)
probably not as open an ecosystem, as one would think, the organisisms eat the methane, they don't trasnmute it, therefore they die, and probably the methane is broken back down and released back, hence, methane may not be the catalyst, not sure what is, and if methane is the catalist, maybe the rocks are what their eating, and theres tons of rock under the ice
These organisms survive by converting methane into energy, enabling them to survive where there is no wind or sunlight,
The missed the part that makes this case unique. The organism could live with no wind, no sunlight and no cheetos!
Sure you could use store brand cheese puffs.........if you call that living.
... And then, how do we know who's who? I mean, if any of those researchers had been replaced by an imitation, how could we tell?
I'm a biogeochemist (haven't worked on this project or in the arctic, but I know about microbial communities and organic matter decay) and while this is certainly interesting, it is not very strange.
What you have to remember is that organic matter decays very quickly (and some types decay faster than others, e.g. DNA seems to decay faster than lignin), but only if it has plenty of oxygen. For this same reason we still find oil after millions of years, it is anaerobically decayed organic matter. Furthermore, if you look closely at the chemical composition of the oil, you can determine how old it is by looking at how far it has decayed rather than looking at the overall mass which will barely have changed essentially (so rather than seeing C30H60 + 45O2 -> 30CO2 + 30H2O it would look more like C30H60 -> 2C15H30 followed by C15H30 -> C7H14 + C8H16, which are very slow steps)
In Antarctica, we have a very similar environment, except now our low oxygen concentration isn't because the organic matter was buried under sediment but under ice. Add to this that we have subzero temperatures (low temperatures reduce the rate of organic matter decay) and the case is starting to add up for long term preservation of organic matter. So while this system will certainly run out of organic matter (and thus ammonia and methane), it will do so very slowly.
Since I don't know the exact individual species involved in this ecosystem it becomes very hard to say which step exactly is limiting the growth. However, I can tell you that ammonia is converted into other more oxidized nitrogen species (such as nitrite and nitrate) relatively easily compared to the rate of methane conversion. So my guess would be that either the limiting step is the methane production, the system lacks enough other nutrients like phosphate (which, interestingly, is generally a limiting factor in marine systems), or there is not enough sulfate (methane is generally broken down by microbes by using sulfate as an oxidizer, if you get a sediment sample with a lot of methane in it, you will generally find not much sulfate remains).
I hope this helps to clarify a few things, but without knowing the actual microbial community and depositional environment etc. I can't say much for certain about the actual limiting factor.
I almost thought that was a Haiku:
Methane and ice sheets - Just like one of the space moons; As well as comets.
Archaea icebergs
Loves Betty,Veronica
"Just the Tip", he begs...
Additionally, we have van t'Hoff's rule, stating that increasing the temperature will result in 2-3 times the speed of the reaction. Reversely it means that organisms living close to the freezing point of water have their reaction speed reduced to about one tenth to one hundredth.
Researchers need to at least check whether organisms living on this diet can generate code in a caffeine-free ecosystem.
yep, knew it all along
Remember kids, if you're not paying for the service, YOU ARE THE PRODUCT THAT IS BEING SOLD.
The average surface temperature on Titan is about -180 C. On Titan water is a rock, and since these (and all other Terran) organisms are mostly water I think it unlikely. Any critter that lives on Titan will not be at all similar to anything on Earth, no matter how extreme its environment.
"Think about how stupid the average person is. Now, realise that half of them are dumber than that." - George Carlin
Water is important here on Earth as communicating fluid, a medium for transportation of molecules in cytoplasm. It also happens to be important solvent, due to its polarity. In a way, abundance of water shapes the way we think about chemistry and how we classify chemical compounds. In the world where water doesn't form highly corrosive liquids, e.g. pH is largely nonsensical. Water molecule in liquid phase easily breaks down and emits a free proton, but does liquid methane do as well? Does it have some other trick instead? Chemistry of solid water temperatures has to be reinvented first (or chemistry as a whole massively generalized), and only then we can understand what we may find in such worlds.