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Phytoplankton's Vertical Migration UPSC NOTE

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  Many plankton species migrate from the deep ocean to the surface and back . Single-celled phytoplankton , lacking appendages , face diffic...

 

  • Many plankton species migrate from the deep ocean to the surface and back.

  • Single-celled phytoplankton, lacking appendages, face difficulties in this migration.

  • Researchers studied Pyrocystis noctiluca, a bioluminescent phytoplankton.

  • Phytoplankton are generally denser than seawater, requiring strategies to stay afloat.

  • P. noctiluca cells can control their density to adjust their position in the water column.

Inflation Strategy for Buoyancy

  • Researchers discovered two distinct sizes of P. noctiluca cells in a bloom.

  • Videos revealed that the cells undergo significant inflation.

  • The team used a gravity machine to simulate ocean depths and test the effects of inflation.

  • Inflated cells were less dense than seawater, allowing them to float upward.

  • Inflation is a natural part of the phytoplankton's cell cycle.

  • A vacuole in the cell fills with fresh water, causing the cell to swell.

  • Inflated daughter cells float upward due to their reduced density.

  • After reaching the surface and growing, the cells become heavier and sink, repeating the cycle.

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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Phytoplankton's Vertical Migration UPSC NOTE
Phytoplankton's Vertical Migration UPSC NOTE
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