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Dinosaurs=Endo or Ecto, the age old question

  • 18-11-2006 1:10am
    #1
    GWolf
    Closed Accounts Posts: 412 ✭✭


    Simple question, were dinosaurs "hot" or "cold" blooded.


Comments

  • #2
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,591 Mod ✭✭✭✭Capt'n Midnight


    any 10 tonne animal is warm blooded due to surface to volume ration so it's an academic question for the largest ones

    the flying reptiles would have been warm blooded because of the heat generated when flying - but they weren't dinosaurs

    fish like tuna and great white sharks are warm blooded in adulthood - I doubt they are warm blooded when young, and dinosaurs are more closely related to teh latter than the former.

    wide variety of animals and I reckon some were both at different stages of life - based on bone structure

    then again moschops and the lads would also have benefitted from large size later in life but I haven't heard anyone suggest they were warm blooded`

    moschsize.jpg


  • #3
    GWolf
    Closed Accounts Posts: 412 ✭✭GWolf


    tuna..right...actually their closest relatives are birds, not fish. And as far as I know BW Sharks are born warm blooded.

    Also, that's a pretty bad pic of a moschops


  • #4
    delos
    Registered Users, Registered Users 2 Posts: 404 ✭✭delos


    IIRC the bone structure in large dinosaurs sometimes shows a change from that typical of endothermic creatures when they are juvenile to that typical of ectothermic creatures when they reach adulthood. The evidence is disputed but if it is correct it could indicate a change in metabolic rates with increasing maturity.
    With such a large and diverse group it would come as no surprise if there were several metabolic strategies used.


  • #5
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,591 Mod ✭✭✭✭Capt'n Midnight


    GWolf wrote:
    tuna..right...actually their closest relatives are birds, not fish. And as far as I know BW Sharks are born warm blooded.
    Sharks are more closely related to us than to tuna, just showing that warm bloodedness has developed more than once and even closely related species may differ in internal heat production.
    GWolf wrote:
    Also, that's a pretty bad pic of a moschops
    Right oh , I'll get me camera
    BRB


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