Stone-boiling maize with limestone: experimental results and implications for nutrition among SE Utah preceramic groups

Groups living on Cedar Mesa, SE Utah in the late Basketmaker II period (Grand Gulch phase, AD 200–400) were heavily maize-dependent, but lacked beans as a supplemental plant protein, and pottery vessels for cooking. Common occurrence of limestone fragments in their household middens suggests 1) limestone may have been used as the heating element for stone-boiling maize and 2) this practice might have made some maize proteins more available for human nutrition. Experiments examined these possibilities; results indicate that stone-boiling with Cedar Mesa limestone creates an alkaline cooking environment suitable for nixtamalization of maize kernels, and that maize cooked in this fashion shows significant increases in availability of lysine, tryptophan, and methionine. Archaeological limestone fragments from a Grand Gulch phase site show amounts of fragmentation and changes in density consistent with repeated heating. While not conclusive, these data indicate that further research (e.g., examination of archaeological limestone fragments for maize starch grains or phytoliths) is warranted. It is suggested that greater attention be paid to archaeological indications of stone-boiling with limestone among maize-dependent but pre-pottery societies.     

Following the caterpillar fungus: nature,commodity chains,and the place of Tibet in China's uneven geographies

Following caterpillar fungus as it travels from the Tibetan Plateau to wealthy Chinese consumers, this article makes several interventions into geographical studies of commodity chains. First, it argues for an expansion beyond the usual call to connect the political economy of production with cultures of consumption; the cultural politics of production and political economies of consumption must also be considered. Second, it argues for bringing together political economy and more-than-human analytical approaches to commodity chains, showing how nature and the nonhuman play a key role in an assemblage that has allowed Tibetans to navigate livelihoods in a rapidly changing economy. This challenges a tendency to assume a universal figure of ‘the human’ in more-than-human geographies. Third, by connecting the erasure of Tibetans from representations of various natures used to sell caterpillar fungus with the broader politics of Tibetans within the People's Republic of China, we show that commodity fetishism can conceal not just labor relations, but also political struggles not reducible to class. Finally, we show that following a small fungus can shed light on the unevenness of China's capitalist development obscured in monolithic narratives of China's rise, demonstrating the value of expanding commodity chain studies beyond those that end with Western consumers.     

Compound-specific amino acid isotopic proxies for distinguishing between terrestrial and aquatic resource consumption

Compound-specific amino acid carbon-isotope compositions have shown particular promise for elucidating dietary behaviors in complex environmental contexts, and may also be able to mitigate the effect of many of the limitations inherent to palaeodietary reconstructions. Here, we investigate the efficacy of compound-specific amino acid isotopic proxies in characterizing the consumption of different dietary protein sources using amino acid carbon-isotope compositions for humans and fauna from Rössberga (Early to Middle Neolithic), Köpingsvik (Mesolithic and Middle Neolithic), and Visby (Medieval Period), Sweden. We also assess the explanatory capabilities of an isotopic mixing model when used with essential amino acid carbon-isotope compositions of humans and local fauna. All three isotopic proxies distinguished among humans from the three sites consistently and informatively, and were able to enhance the broad interpretations made using bulk isotopic compositions. The mixing model palaeodietary reconstruction revealed considerable diversity in relative protein source contributions among individuals at both Köpingsvik and Visby. Comparing the mixing model for bulk carbon- and nitrogen-isotope compositions to the model for essential amino acid isotopic compositions further demonstrated the likelihood of underestimation and overestimation of marine protein consumption for both aquatic-dominant and mixed marine-terrestrial diets when using bulk isotopic compositions.