Comparative Nutritional Ecology of Two Genera of Vampire Bats: Desmodus Rotundus and Diaemus Youngi
Cornell University, 2002 - 418 páginas
Chemical and amino acid analyses of carcasses and blood diets were conducted for the first time, and significant differences between mammalian and avian blood as a food source were confirmed. Desmodus exhibited physiological constraint to mammalian blood through lower retention efficiencies and reduced fitness on the avian blood diet. Similarly, Diaemus was more efficient on its native avian versus mammalian blood diet. The physiological mechanism of resource partitioning by Desmodus was efficient use of relatively high concentrations of dry matter and crude protein in mammalian blood, and the inability to utilize fat. In contrast, Diaemus met almost half its energy requirement from fat in the dilute avian diet but was less efficient on the bulky mammalian diet. Vampire bats are therefore physiologically adapted to a specific host, selecting not only the package (mammals versus birds), but what is in the package (blood type).
ECONOMIC IMPACT OF VAMPIRE BAT ACTIVITY
DESCRIPTION OF A DIGESTION CHAMBER AND
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adaptations Agriculture amino acids analysis animals assimilation efficiency associated avian blood diet balance behavior bites bitten blood feeders blood-feeding body mass calcium captive carcasses cattle Chapter chicken blood diet collection Colombia Comparative composition concentrations consumption Cornell cow blood cow blood diet daily dairy defibrinated defibrinated chicken designed Desmodus rotundus determine Diaemus differences digestion chambers dry matter economic effect of diet efficiency energy excretion feeding females Figure herd higher host housed increased individuals ingested insects Institute intake interaction Journal laboratory levels loss lower maintenance male mammalian blood diet mammals mean milk production months morphological native nitrogen nutrient nutrition observations partitioning period physiological Press rabies range region requirements resource respectively retained retention Retention efficiency sample Schutt showed significant significant effect significantly specialization species Table trials University urine values vampire bat activity versus vertebrate weight Wimsatt