Pyramids of biomass help please x

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In a pyramid of biomass: Plankton-Herring-tuna-parasitic worm.

If tuna eats 1 kg of herring, it gains about 65g in mass,  give two reasons why so little of the mass of a herring is converted to mass of the tuna that eats it? please help! and if you could explain it that woudl really help :) x

Posted Thu 2nd May, 2013 @ 12:49 by Dani

2 Answers

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I think one of the answers could be that mass through movement of the herring is lost and so it is not passed on to the tuna. Just like with humans mass is lost through movement/exercise.

Im not sure about a second answer but hope this helps ;)

Answered Thu 2nd May, 2013 @ 17:08 by :) PurpleJaguar (: - Team GR
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The mass is lost through:

  • Egestion
  • Excretion
  • Resiration
  • Parts not eaten (eg bones)

I have uploaded a ppt summing up the pyramids of number and biomass if you'd find that useful :)

Answered Thu 2nd May, 2013 @ 18:20 by CoolKid