Talk:Hadal zone

Wiki Education Foundation-supported course assignment
This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Jxxl.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 22:57, 16 January 2022 (UTC)

Food falling from above
What about hydrothermal vent eco-systems. I thought the whole thing about the hadal zone is that it doesn't end up getting any of that food, so any organisms living down there are probably getting energy directly or indirectly from hydrothermal vents. Brentt 20:42, 30 September 2006 (UTC)
 * The pelagic zone article explains this better. In fact, I'm surprised that this article isn't merged into that one.  It's mostly redundant.  Afalbrig 10:54, 10 October 2006 (UTC)
 * I think this article could easily justify it's existance if it were expanded, perhaps by an expert. It should at least be marked as a stub. --Xanthine 10:04, 23 January 2007 (UTC)
 * Sortof. Life in the hadal zone is limited by the extremely poor nutrient availability. This lack of food, _not_ the hostile conditions with extreme pressure and cold, is the reason biomass is so low down there (species diversity is probably high, though poorly explored). Hydrothermal vents are like oases, with rich life due to the abundance of nutrients, but the effect is extremely local. The same is true with other sources of food, e.g. whale falls, and the vast bulk of nutrition for hadal organisms consists of "marine snow", ie copepod poop. The Man On The Street (talk) 19:33, 13 August 2010 (UTC)

Depth off slightly?
'The most accurate measurement on record was taken by a Japanese probe, Kaikō (かいこう), which descended unmanned to the bottom of the trench on March 24, 1995 and recorded a depth of 10,911 meters (35,798 ft).' Mariana Trench But here it says the deepest depth is 35,800 ft, What one is True and could they both be fixed? I think rounding it up is rather messy, I would assume Mariana's Depth is more accurate and correct, But it would need comformation. NekoKiyo (talk) 10:39, 16 July 2008 (UTC)
 * I went ahead and changed it NekoKiyo (talk) 13:18, 21 July 2008 (UTC)

Organisms from this zone will die in the zones where pressure is lower.
A narrative hook. Why do they die? Is the pressure such that chemistry behaves differently, in cell membranes etc? I'm discounting the idea that it is becuase it is very difficult to bring them up and they die of the metaphenomena. Midgley (talk) 09:15, 11 August 2012 (UTC)
 * A very few bacteria from the hadal zone need pressure to function, presumably because the pressure alters the chemical properties of their proteins; I'll add a link. Normally, however, deep-sea organisms die when brought to the surface because they are adapted to a low and extremely stable temperature, and even a very small temperature change can kill them. The Man On The Street (talk) 10:35, 26 October 2013 (UTC)

I've removed the text:  I could have simply changed it to Some organisms.. but the reference seems to be mostly referring to the effects of rapid decompression. In fact it says that some types of bacteria do survive rapid decompression. And many living things can adapt to changing pressure, given time. I think it's probably best to just leave it out altogether. nagualdesign (talk) 05:34, 7 December 2013 (UTC)

Is pressure such a bad thing?!
The article states that, "The intense pressure and the lack of light create hostile living conditions." Lack of light is a fair point, but what has pressure got to do with it? Sure, if you take a land lubber like me down to 20,000m I'll get squished like a bug, but there's nothing intrinsically hostile about pressure, and there are organisms that thrive at these depths. I think it's a silly statement and I'd remove it.. but.. I may be mistaken, and I'd love for somebody to tell me why exactly. nagualdesign (talk) 04:10, 5 December 2013 (UTC)

I would remove it if I were you, because this is bogus. And yes, pressure is a bad thing. -Kate

Hades
Correct me if I am off here, but Hades, in Greek Mythology, is the name of the ruler of the Greek underworld, not the name of the underworld itself.

PinothyJ (talk) 04:14, 4 February 2015 (UTC)…

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Hades Part II
I'm fairly sure people do not think there is a colony of Greeks 6 kilometers below sea level, the country couldn't afford it. And Hades is not the only realm in the deeps; there is also the Abyss. And, not to interrupt your reverting contributions, maybe if you editors  actually read the article you could make sure there isn't another typo like "from a depth of to the bottom of the ocean" that sat in the lede for 9 months. 50.64.119.38 (talk) 15:31, 16 November 2017 (UTC)


 * Haha.. Nobody mentioned a colony of Greeks! My thought was that "the underworld in Greek mythology" is less likely to confuse than "the Greek underworld" (with no mention of mythology). While you and I wouldn't find either phrase confusing, a child doing her homework about the ocean trenches might. A deep ocean trench in the Aegean, perhaps? Who knows.
 * As for the "maybe if you editors actually read the article", we're all editors here including you. And as I'm sure you're aware it's very easy to make typos (like 'poilicy' or 'kilomateres') and/or fail to spot them. I apologise on behalf of Wikipedia for any errors and thank you for correcting them.   nagual  design   19:02, 16 November 2017 (UTC)

Grammar
A small English lesson; to demarcate means to draw a line; a demarcation is a boundary or frontier or border. To tell you the truth I forgot to mention Abyssopelagic, so it was bad grammar on my part. It was better than delineate which it replaced. 50.64.119.38 (talk) 17:58, 16 November 2017 (UTC)


 * Thank you for the lesson. "Demarcation" can also mean the drawing of such a line, but that's beside the point really. As I explained on my talk page neither "delineate" nor "demarcation" were appropriate. If in doubt always use plane English. I know the word should be "plain", I just wanted to give you the opportunity to mansplain something else. (Just kidding!)  nagual  design   19:02, 16 November 2017 (UTC)

Added to exploration, and a question...
Hi editors, I noticed the exploration section was looking kind of sad, so I've added a bit on the nature of exploration and different dives by submersibles. My question is, would you consider information on litter found in the Ryuku trench to be relevant for this page? I thought that it could be relevant based on the methods used to discover this fact (they used trawls) but I see why it might be debated over since the hadal zone refers specifically to the water column rather than things on the benthos. Jxxl (talk) 20:31, 6 April 2018 (UTC)

quotation marks?
Hi editors, In the following section, I feel that it's strange to directly quote from the source, even if it is properly cited. As such, I'm going to paraphrase it more, but here is the section for reference/reverts. "In total there are 33 trenches (27 subduction trenches and 6 trench faults) and 13 troughs around the world—46 individual hadal habitats in total."[3] All the trenches together occupy an area less than one-quarter of one percent of the entire seafloor, with 84% of the hadal habitat found in the Pacific Ocean.[3] Jxxl (talk) 19:10, 11 April 2018 (UTC)

List?
As there are fewer than fifty of these discrete environments at extreme depths, I think it would be practical and useful to list them all. J S Ayer (talk) 01:08, 4 June 2019 (UTC)

There is a list of the 47 deeps at https://www.sciencedirect.com/science/article/pii/S0079661117302768 but it is too late for me to do anything now. J S Ayer (talk) 03:57, 13 June 2019 (UTC)

"below which teleosts would be hyperosmotic, assuming TMAO requirements follow the observed approximate linear relationship with depth"
can someone translate that to actually understandable english?

Article terribly out of date.
Cameron no longer holds the record as of the 2019 Five Deeps Expedition. — Preceding unsigned comment added by 74.194.194.176 (talk) 02:54, 19 May 2022 (UTC)

Deepest missions contradictions
The "Deepest missions" section states that "[I]n March 2012...[t]he descent of the Deepsea Challenger reached a depth of 10,908 metres (35,787 ft)". However, the article also states that "[i]n June 2012, the Chinese manned submersible Jiaolong was able to reach 7,020 m (23,030 ft) deep in the Mariana Trench, making it the deepest diving manned research submersible." These two statements seem to contradict each other, although the claim about Jiaolong is paraphrased from source [31], which states that "the depth that Jiaolong reached is not the deepest place humans have ever been. But it is the deepest point achieved by any scientifically designed manned submersible". Aevynn314 (talk) 00:37, 7 August 2023 (UTC)