A 90,000-yr record of environmental change before 18,000 cal yr B.P. has been constructed using pollen analyses from a sediment core obtained from Salar de Uyuni (3653 m above sea level) on the Bolivian Altiplano. The sequence consists of alternating mud and salt, which reflect shifts between wet and dry periods. Low abundances of aquatic species between 108,000 and 50,000 yr ago (such as Myriophyllum and Isoëtes) and marked fluctuations in Pediastrum suggest generally dry conditions dominated by saltpans. Between 50,000 yr ago and 36,000 cal yr B.P., lacustrine sediments become increasingly dominant. The transition to the formation of paleolake “Minchin” begins with marked rises in Isoëtes and Myriophyllum, suggesting a lake of moderate depth. Similarly, between 36,000 and 26,000 cal yr B.P., the transition to paleolake Tauca is also initiated by rises in Isoëtes and Myriophyllum; the sustained presence of Isoëtes indicates the development of flooded littoral communities associated with a lake maintained at a higher water level. Polylepis tarapacana-dominated communities were probably an important component of the Altiplano terrestrial vegetation during much of the Last Glacial Maximum (LGM) and previous wet phases.

The Turkic language Sakha (Yakut) uses a copular verb with predicate nominals but not with predicate adjectives or verbs in certain environments, including relative clauses, nominalized clauses, and complements to nouns. Previous work takes this as evidence that adjectives but not nouns are true one-place predicates. However, unaccusativity diagnostics show that adjectives pattern with nouns in Sakha, as in other languages: neither is inherently predicative without a predicative functional head. The need for a copula with predicate nominais in certain environments can be explained using Richards’s distinctiveness condition. Relative clauses, noun complements, and nominalization structures all bring a nominal head in close contact with the predicate. If the predicate itself is nominal, a verbal copula must intervene to separate the predicate from the embedding head of the same category.