Structure and evolution of the Amazonian biota and its environment: an integrative approach

Abstract

We propose a new evolutionary and environmental synthesis of Amazonian biodiversity that will seek to answer 11 key research questions on 4 target-taxa (butterflies, plants, birds, primates): Question 1 asks where biodiversity is distributed in Amazônia. We will develop the most complete georeferenced database to date for Amazonian vascular plants and terrestrial vertebrates and then use that information to address fundamental questions about patterns of biodiversity. With Q2, we ask where species diversity is distributed and what are its biotic and abiotic associations? In Q3 we investigate how species diversity is organized at varying spatial scales into common distributional patterns (endemism). Then, we investigate the history of Amazonian diversity, asking (Q4) what are the large-scale phylogenetic histories for species within our "target" groups and (Q5) what has been their temporal pattern of diversification. We integrate these data in Q6 in order to address the paleobiogeographic history of our four groups across Amazônia. Integrating answers to these questions provides essential knowledge about the evolutionary origin of ecological assemblages at different spatial scales and helps resolve uncertainties about the drivers and patterns of diversification. Next, we ask questions about the history of environmental change. In Q7 we want to know how historical demographic and phylogeographic patterns can be used through genetic analysis, along with environmental raodeling, to infer environmental stability or change from the late Neogene to present at regional scales. In Q8, we turn to geology and ask how new stratigraphic and age studies can narrow the uncertainties about the paleogeography of the Amazonian drainage system and terrestrial tropical Amazônia, particularly in the west, and since the latest Neogene when the world became cooler and drier and the effects of climate forcing more pronounced. In Q9, we ask, integratively, what data from paleobiogeography, genetic-demographic, and geology can jointly tell us about Amazonia's past ecology and environment. From these studies we examine the evolution of structural and functional landscape diversity of Amazonian environments at different spatial scales. In Q10 we use macroecological approaches, remote sensing, and climate-atmospheric modeling to ask how ecosystem function is related to ecosystem diversity over time. We focus on how late Neogene to Recent environments (from the above studies) influenced Amazonian functional diversity in biogeochemical flows, and how these, in turn, shaped the dimensions of biodiversity. Finally, in Q11 we ask how this history of Amazônia itself influenced global-scale changes in biogeochemical cycling. (AU)