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Sunday, March 15, 2015

TAAF 2015 Stamp Issue
Antarctic Krill (Euphausia superba)



    


:: TAAF (Terres Australes et Antarctiques Françaises)
 :: THEME: Krill (Euphausia superba)
  :: NOMINAL VALUE: 1.71€ 
   :: ISSUE DATE: 1 January 2015
    :: STAMP DESIGN: Yves Beaujard
     
    

FILTER FEEDING
Antarctic krill (Euphausia superba) directly use the minute phytoplankton cells, which no other animal of krill size can do. This is accomplished through filter feeding, using the krill's highly developed front legs, providing for an efficient filtering apparatus: the six thoracopods (legs attached to the thorax) form a very effective "feeding basket" used to collect phytoplankton from the open water.

In the finest areas the openings in this basket are only 1 μm in diameter. In lower food concentrations, the feeding basket is pushed through the water for over half a metre in an opened position, and then the algae are combed to the mouth opening with special setae (bristles) on the inner side of the thoracopods.