This site contains a description of the Tropical South American Diatom Database. The database includes diatom (unicelular siliceous algae) data and associated environmental variables of waterbody sites (streams, wetlands and lakes; n=270 sites aprox.), covering an altitudinal gradient from 220 to 5,070 m a.s.l. between 8°N–30°S and 58–79°W.
Diatom samples comprise sediment surface, core tops, periphyton, and plankton, collected in the period 1977–2009 by different investigators for a variety of scientific objectives (e.g. biodiversity, paleoclimatic reconstructions, taxonomic descriptions).
Depending on the study waterbody, three categories of environmental data are available:
Diatom data consist in site-by-species relative abundance matrices in about 90% of the samples, while species data of the remaining 10% of the samples consisted of presence–absence counts.
The database is mostly available on Dryad repository (see 'publications' on the left-hand menu) while here the aim is to provide a georeferenced database to promote biodiversity, biogeographic and palaeoecological studies in tropical South America using diatoms as sentinel organisms.
The database is a collaborative network of multiple researchers. We acknowledge funding received from:
Authors are also grateful to colleagues who submitted samples and unpublished diatom and environmental data for the construction of the database: