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Geodiversity in the Amazon drainage basin
Cécile M E Alsbach1, Arie C Seijmonsbergen1, Carina Hoorn1
1Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, PO Box 94240, 1090GE, Amsterdam, The Netherlands.
Summary
This study objectively evaluates Amazon geodiversity, revealing geology and hydrology as key drivers. The Amazon drainage basin is divided into three distinct regions based on these geodiversity characteristics.
Area of Science:
- Earth Science
- Geoscience
- Ecology
Background:
- The Amazon drainage basin (ADB) is Earth's largest, rich in abiotic landscape features.
- Geodiversity within the ADB remains objectively unevaluated, representing a significant knowledge gap.
Purpose of the Study:
- To objectively evaluate geodiversity in the Amazon drainage basin.
- To identify key geodiversity characteristics and refine existing global geodiversity maps for the ADB.
- To inform conservation strategies through enhanced understanding of geodiversity.
Main Methods:
- Meta-analysis of a global geodiversity map and its components.
- Systematic literature review to identify geodiversity determinants in the ADB.
- Evaluation of geology, geomorphology, soils, and hydrology components for map refinement.
Main Results:
- Geology (lithological diversity, structures) and hydrology (processes influencing geomorphology, soils) are primary geodiversity determinants.
- The ADB is delineated into three main regions: Andean/western, Cratonic/eastern, and the Solimões-Amazon river system.
- Methods for mapping geomorphological and hydrological diversity were identified.
Conclusions:
- Geology and hydrology are the main drivers of geodiversity in the Amazon drainage basin.
- The identified regional subdivisions provide a framework for understanding ADB geodiversity.
- Future research should link geodiversity components with biodiversity for improved conservation planning.
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