6 in 60: Number 39 – Trenches


Hello! Today we’re going to go really deep down, to the bottom of the ocean.

  1. Ocean trenches are long, narrow depressions on the sea floor. These chasms are the deepest parts of the ocean – and some of the deepest natural spots on Earth.
  2. Trenches are very hostile environments, pressure is more than 1000 times on the surface and water temperatures are only just above freezing. No sunlight penetrates through to the trenches this makes photosynthesis impossible.
  3. The Mariana trench is a crescent shaped trench and is the deepest point of the ocean in the Western Pacific ocean.
  4. The three most common organisms at the bottom of the Mariana Trench are xenophyophores, amphipods and small sea cucumbers.
  5. Sea cucumbers have even been found living in the challenger deep (the deepest point of the mariana trench). Sea cucumbers are echinoderms like star fish, and they harvest food from the sediment with their feeding appendages
  6. Many life forms use bioluminescence (a chemical reaction to create light) in order to attract prey or find a mate when in the trench.


The Sources

The first two come from national geographic page on trenches – if you’re interested in finding out more go and give this page a read it’s full of stuff! The third comes from a previous 6 in 60, the big old blue. The fourth comes from livescience. The fifth comes from a blog on scientific american. The sixth comes from marinebio.

Want more 6 in 60 – click here!

ThatBiologist Everywhere!




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