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B.Galdiks (47)
Lecture

Expensive Tissue.docx

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Department
Anthropology
Course
ANTH 2231
Professor
B.Galdiks
Semester
Summer

Description
“Expensive Tissue” Hypothesis  Meat-eating and Encephalization  L. Aiello and P. Wheeler 1995)  An organism’s body produces only a finite amount of energy to run all various components (11 systems)  Body size  Environment  Metabolism  Source of nutrition  Maintaining an organ/system requires energy from the body’s reserves and so it must be worth it in terms of some adaptive advantage it provides  E.g., eyesight when inside caves  System has to be worth the energy to be maintain in organism  The brain and the gut are both metabolically expensive organs  To increase the size of either one would require some cost to other organs  Therefore, in order to evolve a larger brain either the digestive system (or other organs) will suffer…
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