Unprecedented Diversity of Marine Bacteria Discovered

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Discussion Overview

The discussion centers around the discovery of a greater diversity of marine bacteria in seawater than previously estimated, as reported in a recent study. Participants explore the implications of these findings, including the distinctions between bacteria and archaea, and the educational frameworks surrounding these classifications.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants highlight that one litre of seawater can contain over 20,000 different types of bacteria, suggesting a much greater microbial biodiversity than previously thought.
  • One participant questions the relevance of a related article that discusses the prevalence of archaea over bacteria in sediments, noting a lack of mention of archaea in the original BBC article.
  • Another participant reflects on their educational experience, stating that they were taught that all eukaryotes were essentially classified as bacteria and mentions the term "archaebacteria," indicating confusion over the distinctions between these groups.
  • Concerns are raised about the persistence of outdated educational frameworks, with one participant noting that many textbooks and professors have not adopted the newer classification systems based on DNA sequencing, leading to ongoing debates about the classification of life.
  • References to external articles and discussions about the historical context of microbial classification are provided, indicating that the topic is still subject to debate and differing opinions.

Areas of Agreement / Disagreement

Participants express differing views on the classification of microbial life, particularly regarding the distinction between bacteria and archaea. There is no consensus on the educational implications or the acceptance of newer classification systems.

Contextual Notes

Some participants note that educational materials may not reflect recent scientific advancements, leading to confusion about microbial classifications. The discussion also highlights the ongoing debate surrounding the classification systems based on morphology versus genetic sequencing.

Gokul43201
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New finds from (aquatic) microbial cataloguing studies show that there's way more kinds of bacterial life in seawater than previously estimated.

http://news.bbc.co.uk/2/hi/science/nature/5232928.stm

One litre of seawater can contain more than 20,000 different types of bacteria, scientists have found.

The extraordinary number has been established by an international project attempting to catalogue all ocean life.

It suggests microbial biodiversity is much greater than previously thought, say Mitchell Sogin and colleagues.
Couldn't easily find the original source. Maybe it's not made it's way out yet?

Related article :
https://darchive.mblwhoilibrary.org/bitstream/1912/867/1/3846.pdf
 
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Great information gokul!
 
Cool article! I just want to make sure, if I'm missing something, how is that related article, well, related? :smile:

It says that the researchers found more archaea than bacteria in sediments, which I find interesting, because in intro-biology I wasn't taught that there was a difference. I remember learning that all eukaryotes were basically called bacteria and that there were some called "archaebacteria," but that's it. We focused on the eukaryotic/prokaryotic distinction.

The BBC article on the other hand doesn't mention archaea.

Also, here's an interesting Wiki article I found while trying to learn more. It looked like this distinction was controversial for a little while.

http://en.wikipedia.org/wiki/Three-domain_system
 
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Mickey said:
It says that the researchers found more archaea than bacteria in sediments, which I find interesting, because in intro-biology I wasn't taught that there was a difference. I remember learning that all eukaryotes were basically called bacteria and that there were some called "archaebacteria," but that's it. We focused on the eukaryotic/prokaryotic distinction.

Most textbook don't change and a lot of Prof don't want to change. My intro the micro prof did not like the new classification system because it uses DNA sequence rather than morphology and physiology of organism.

The eukaryotes and prokaryotes is still used because most people are ignorant of the work by Woese et al. or argue for the dichonomy system (i.e. Ford Doolittle) and there still is argument about it

http://scienceblogs.com/aetiology/2006/05/are_we_teaching_a_wrong_idea.php

I made a review of Woese theory
http://www.physicspost.com/articles.php?articleId=175
 
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