Volumes of the Respiratory and Circulatory Systems in Tufted and Mallard Ducks
نویسنده
چکیده
Tufted ducks habitually dive for their food and may remain submerged for up to 40 s. Mallards, on the other hand, merely upend themselves for_ a few seconds when dabbling. It was decided, therefore, to determine the size of the oxygen storage compartments in these two aquatic birds. Haemoglobin concentration, blood volume, and volume of the respiratory system are all significantly larger in the tufted duck than in the mallard. Myoglobin concentration in the pectoral and leg muscles of the tufted duck is similar to that in the locomotory muscles of terrestrial birds and mammals. Amounts of usable oxygen (at STPD) stored in the body were calculated to be 41-5 ml kgfor tufted ducks and 29-0 ml kgfor mallards.
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