A2: Microbes in the news

Article Title: Deepest Life on Earth May Be Lurking 6 Miles Beneath Ocean Floor

Author: Thea Ghose

Date: April 11, 2017

Source: Live Science

Link: https://www.livescience.com/58632-deepest-life-on-earth-possibly-found.html

Assignment author: Morgen Southwood

Summary-

There are mud volcanoes under the sea floor and they may be inhabited. Biological signatures in material that has risen to the surface could possibly be coming from microbial life 32,800 feet under the surface of the ocean floor. The organic matter are good indicators of the presence of life, but could also have been produced by abiotic processes.

Connections-

Reading this article reminded me of earlier in the semester when we discussed the origins of life and more recently in the semester when we discussed Bas-Becking’s idea. When we discussed the origins of life near under water vents we discussed the kinds of organic chemicals that could have been precursors for the first life forms, those same compounds were found in these mud deposits. When we discussed that life could/would be everywhere, I considered the presence of life beyond our atmosphere, but not beneath the crust of the earth. This article made me wonder what microbial super power could survive in those conditions.

Critical analysis. —

This article only spends one half of it’s very short article discussing the new discovery. I wish that there had been more details on the discoveries methods. Apparently the compounds came from rocks that were “spewed’ onto the surface, there was no explanation on how the scientists could be sure that any signs of life originated in the mud volcano, and wasn’t the product of contamination as the mud progressed to the surface.

My favorite sentence in this paper isn’t referring to the recent discovery; it’s within a paragraph summarizing other research on deep sub surface microbial life. The sentence reads, “ the deeper that scientists have looked the deeper life has seemed to go.’     I wonder if there is a limit to this, if scientist will one day conclusively say: no more life past this point. The researchers of the under sea mud volcano seem to think so. They made an estimate for the maximum depth that could support life. Considering a maximum temperature of 122 degrees Celsius and 1000x atmospheric pressure, the deepest Achaean environment would be about 32,800 feet below the surface.

This article was presented both scientifically, and in a way that could be digested by an interested member of the general public. Its lack of depth was compensated by links to relevant background information and relevant studies.

Question-

Will scientists ever be able to definitively state that an environment/ location is completely free of life without having to clarify “that we know of’?

 

Canadian bacteria-like fossils called oldest evidence of life

Source: William Dunham of Reuters

Date: 01MAR2017

Link:  https://www.reuters.com/article/us-science-life-idUSKBN16858B

Summary:

Microfossils found at Hudson Bay near Quebec show similarities to the microbes that exist today around hydrothermal vents on the ocean floor.  This discovery adds weight to the Subsurface Hypothesis that life may have originated in  hydrothermal vents.

Connection: This was a very coincidental find as we have recently cover the Subsurface Hypothesis of the origin of life and hyperthermophiles/ extremophiles.

Analysis: While the thought of having “proof” of one hypothesis being correct is appealing, there is no way to be sure that the formations found in the quartz were formed by  ancient microbes.  Even in the article it says, “The researchers expressed confidence the fossils from northeastern Canada were formed by organisms, saying no non-biological explanation was plausible.”  They say plausible, but still possible.  Without more evidence outside of just the shapes they found, it is a hard road to convince the rest of the scientific community of its authenticity.

Question:  What level of evidence would the scientists need to convince the rest of their colleagues of their theory?