Supplement 1. Data from the 83 South American lakes sampled.
South_American_Lakes_data.txt -- data file
The "South American Lakes data file" contains data on 83 shallow lakes sampled in South America between November 2004 and March 2006. The following data is presented: X coordinate (Decimal degrees); Y coordinate (Decimal degrees); name (Name of the lake. Not all lakes have a name and some lakes are referred to by multiple names); climate zone (The lakes were grouped in five different categories based on the prevailing climate characteristics following the Köppen climate system (1936) digitized by Leemans and Cramer (1991): tropicali, tropical, subtropical, maritime temperate and tundra zone. The Köppen classification is based on monthly rainfall and temperature. Tropicali is an isothermal subzone in the tropics, which has a smaller annual temperature range than the tropical zone, source:-- TABLE: Please see in attached file. --
http://www.fao.org/WAICENT/FAOINFO/SUSTDEV/EIdirect/climate/EIsp0002.htm); average air temperature in warmest month (Celcius, source: M. New, D. Lister, M. Hulme, and I. Makin. 2002. A high-resolution data set of surface climate over global land areas. Climate Research 21. The complete paper can be freely downloaded via:
http://www.cru.uea.ac.uk/cru/data/tmc.htm); average air temperature in coldest month (Celcius, source: M. New, D. Lister, M. Hulme, and I. Makin. 2002: A high-resolution data set of surface climate over global land areas. Climate Research 21. The complete paper can be freely downloaded via:
http://www.cru.uea.ac.uk/cru/data/tmc.htm); soil type (Source: SOTERLAC "Soil and terrain database for Latin America and the Caribbean ", FAO: Land and Water Digital Media Series #5, scale: 1:5 million scale. Type of top soil and descriptions of the different types can be found at:
http://www.fao.org/AG/agl/agll/key2soil.stm); lake area (m2, determined using landsat Orthorectified Landsat Thematic Mapper Mosaics of the year 2000. If image was cloudy images of 1990 were used. In rare cases when image deviated much from area observed in the field, all waypoints measured in the field were plotted on top of the image and a "best matching" polygon was drawn around it, of which the area was determined); average depth (Meter, the average depth of the lake was determined using depth measurements from 20 random points and 20 points along transects perpendicular to the longest axis of the lake); altitude (Meter above sea level, based on DEM from gtopo30, converted to an Arcview grid using the procedure published on herpnet.org GTOPT_DEM); conductivity (µS/cm); Total nitrogen (mg/L); Total phosphorus (mg/L); chlorophyll a (µg/L)