This archive contains information for *F2.4 Freeze-thaw freshwater lakes*, a ecosystem functional group (EFG, level 3) of the IUCN Global Ecosystem Typology (https://global-ecosystems.org/).

General notes on maps:
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The maps show areas of the world containing major or minor occurrences of *F2.4 Freeze-thaw freshwater lakes*. Minor occurrences are areas where an EFG is scattered in patches within matrices of others or where they occur in substantial areas but only within a segment of a larger region.

The maps were designed to be indicative of global distribution patterns and are not intended to represent fine-scale patterns. Given bounds of resolution and accuracy of source data, the maps should be used to query which EFG are likely to occur within areas, rather than which occur at particular point locations.

Methods for this map:
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Location of small and large natural lakes was taken from the HydroLAKES database (types 1 an 3 in Messager et al. 2016). We included all lakes with minimum temperature below 0°C (Linke et al. 2019). Occurrences were aggregated to ten minute spatial resolution.

For online visualization and navigation:
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https://global-ecosystems.org/explore/groups/F2.4

Citation:
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David A. Keith, José R. Ferrer-Paris, Emily Nicholson and Richard T. Kingsford (eds.) (2020) The IUCN Global Ecosystem Typology 2.0: Descriptive profiles for biomes and ecosystem functional groups. Gland, Switzerland: IUCN. ISBN: 978-2-8317-2077-7. DOI:10.2305/IUCN.CH.2020.13.en

Data set citation:
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Keith, David A., Ferrer-Paris, Jose R., Nicholson, Emily, ..., Kingsford, Richard T. (2020). Indicative distribution maps for Ecological Functional Groups - Level 3 of IUCN Global Ecosystem Typology [Data set]. Zenodo. http://doi.org/10.5281/zenodo.3546513

Content of the archive:
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F2_4_Freeze-thaw_lakes.xml      Profile text for the funcional group (XML format)
F2.4.web.mix_v1.0.tif      Indicative map (raster layer, GeoTIFF format)
F2.4.web.mix_v1.0.json      Indicative map (vector layer, GeoJSON format)
