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If Cyanobacteria or Lichens can survive on Mars could other small organisms like the Tardigrade then survive & flourish among them?

Due to the thicker atmosphere to be found the bottom of the Hellas Planitia & Valles Marineris (both around 7 km deep) those are the particular areas I'm thinking of.

So to word the question more explicitly I'm asking if.

Oxygen aside are there any other obvious contraindications for the ability of tardigrades & similar organisms to survive & thrive on Mars (most particularly in the Hellas Planitia & Valles Marineris)?

We know from answers to this question atmospheric pressure at the bottom of Hellas Planitia is 1.16 kPa : well below the Armstrong limit's 6.3 kPa I know but Tardisgrades aren't endothermic.

Some other tardigrade links. American Scientist BBC ResearchGate

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  • $\begingroup$ Let us continue this discussion in chat. $\endgroup$ – Pelinore Dec 20 '18 at 11:37
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    $\begingroup$ Consider first checking if tardigrades "survive & thrive" at the atmospheric pressure, nearly pure CO2, and lack of oxygen present on Mars, or if they only can remain in a near lifeless state of cryptobiosis if they are placed at that pressure artificially by some contrived scenario. If your question is about the range of environments at which tardigrades can live and reproduce, then Biology SE would be the place for that question. I see 28 posts: biology.stackexchange.com/search?q=tardigrades $\endgroup$ – uhoh Dec 20 '18 at 12:25
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    $\begingroup$ @uhoh : ^ the CO2 levels won't be a problem & lack of oxygen isn't relevant to the question (which is specifically worded to ask what other than oxygen might be a problem), the atmospheric pressure I'm sure is relevant & has prompted this question to biology SE biology.stackexchange.com/questions/79956/… $\endgroup$ – Pelinore Dec 20 '18 at 14:38
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    $\begingroup$ my goodness why won't CO2 levels be a problem? Essentially pure CO2 is pretty toxic to most organisms. If it's not for tardigrades, can you provide a link or some argument why not? CO2 is soluble in water and will dissolve into living things that exchange gasses with the air (breathe, respirate, etc.) palaeos.com/metazoa/ecdysozoa/tardigrada/tardigrada.html $\endgroup$ – uhoh Dec 20 '18 at 15:41
  • $\begingroup$ @uhoh : ^ CO2 is toxic to animals that require oxygen in the atmosphere, as such it's totally to do with the lack of oxygen, hence not relevant as the question is specifically ignoring that aspect (the lack of oxygen), the toxicity of excess CO2 simply can't be divorced from the expressly ignored oxygen angle which I'm sure you appreciate :) thoughtco.com/carbon-dioxide-poisonous-607545 $\endgroup$ – Pelinore Dec 20 '18 at 18:33

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