Most of Meggers's research was concentrated in South America, particularly in Ecuador, Peru, Venezuela, Chile, Brazil, and Guyana. She also conducted research in the Lesser Antilles and Micronesia. She first worked in
anthropology at the age of 16, volunteering at the
Smithsonian Institution and helping to reconstruct pots excavated from
Pueblo Bonito, an
Ancestral Pueblo village in New Mexico. At the University of Michigan, Meggers was introduced to ancient ceramics from
Marajó Island, in the
Amazon Basin of Brazil. She published her first scientific article on the
Marajoara culture in 1945. In 1954, Meggers proposed her environmental limitation theory, relating the idea of productivity of environment to complexity of society. She suggested that environmental and agricultural resources acted as a limit on cultural complexity. In the 1960s, Meggers and Evans proposed a controversial
diffusionist theory to explain similarities between the pottery of the
Valdivia culture in Ecuador, dated to 2700 BC, and the pottery of the Early and Middle
Jōmon on the island of
Kyushu, Japan. During Meggers and Evans's initial period of work in Ecuador, "Ceramic Phase A" of Valdivia was believed to be the oldest pottery produced in South America. Meggers bolstered her argument that trans-Pacific migrants from Japan were responsible for this pottery by noting that plants, pathogens, and parasites of Japanese origin are found among Andean populations. Her theory was challenged by other archaeologists due to the distance between Ecuador and Japan, and a lack of evidence for complex Jōmon sailing technologies. Excavations in the early 1970s by other researchers found pottery at Valdivia and related sites pre-dating Phase A. Archeologists thus generally now believe that pottery rose independently in the Valdivia and preceding cultures. Meggers and Evans also developed a system by which pottery fragments could be analyzed. In addition, Meggers was among the first to examine environmental influences on ancient societies and to frame culture as an adaptation by humans to the environment. ==Publications==