Direct dietary reconstruction of Pleistocene hominins has long relied upon dental microwear texture analysis and bulk collagen stable isotope ratios ( and ). While bulk collagen isotopic assays primarily register protein intake synthesized over several years, they systematically underrepresent plant carbohydrate consumption due to collagen's preferential uptake of dietary amino acids. Recently, bioarchaeologists have recovered microscopic starch granules and phytoliths trapped within calcified dental calculus (mineralized supragingival plaque) from hominin dental remains. Because dental calculus preserves microremains without metabolic turnover, it provides an unmediated physical record of ingested matter. However, the presence of specific microfossils in calculus establishes only oral exposure, not nutritional absorption. Furthermore, because certain processing behaviors—such as boiling or fermenting—gelatinize starch granules and alter their crystalline birefringence, thermally degraded starches rarely survive the harsh demineralization protocols used to extract microremains. Consequently, calculus microfossil assemblages tend to overrepresent raw or minimally processed fibrous vegetation relative to cooked starch staples.
Based on the passage, which of the following statements are logically supported by the text? (Select all that apply.)
- Bulk collagen stable isotope analysis alone can fail to capture the full extent of a hominin's plant carbohydrate intake.Cevap
- BThe presence of microfossils within calcified plaque confirms that the individual physiologically metabolized the identified plant matter.
- Cooking methods that involve boiling reduce the probability that starch residues from prepared plant foods will be recovered from dental calculus.Cevap
- DCalcified dental plaque undergoes periodic metabolic turnover that erases microfossils embedded earlier in an individual's life.
- EPleistocene hominins derived more of their total caloric intake from raw fibrous vegetation than from cooked plant staples.