World distribution, diversity and endemism of aquatic macrophytes
- Murphy, Kevin - Efremov, Andrey - Davidson, Thomas A. - Molina Navarro, Eugenio - Fidanza, Karina - Crivelari Betiol, Tania Camila - Chambers, Patricia - Grimaldo, Julissa Tapia - Martins, Sara Varandas - Springuel, Irina - Kennedy, Michael - Mormul, Roger Paulo - Dibble, Eric - Hofstra, Deborah - Lukacs, Balazs Andras - Gebler, Daniel - Baastrup Spohr, Lars - Urrutia Estrada, Jonathan
- Datos de publicación:
- AQUATIC BOTANY,Vol.158,,2019
- Aquatic plants - Biodiversity hotspots - Latitudinal diversity gradient - World ecozones - Macroecology
- Migración Web of Science 
- To test the hitherto generally-accepted hypothesis that most aquatic macrophytes have broad world distributions, we investigated the global distribution, diversity and endemism patterns of 3457 macrophyte species that occur in permanent, temporary or ephemeral inland freshwater and brackish waterbodies worldwide. At a resolution of 10 x 10 degrees latitude x longitude, most macrophyte species were found to have narrow global distributions: 78% have ranges (measured using an approach broadly following the IUCN-defined concept 'extent of occurrence') that individually occupy <10% of the world area present within the six global ecozones which primarily provide habitat for macrophytes. We found evidence of non-linear relationships between latitude and macrophyte alpha- and gamma-diversity, with diversity highest in sub-tropical to low tropical latitudes, declining slightly towards the Equator, and also declining strongly towards higher latitudes. Landscape aridity and, to a lesser extent, altitude and land area present per gridcell also influence macrophyte diversity and species assemblage worldwide. The Neotropics and Orient have the richest ecozone species-pools for macrophytes, depending on gamma-diversity metric used. The region around Brasilia/Goias (Brazil: gridcell 10-20 degrees S; 40-50 degrees W) is the richest global hotspot for macrophyte a-diversity (total species alpha-diversity, S-T: 625 species/gridcell, 350 of them Neotropical endemics). In contrast, the Sahara/Arabian Deserts, and some Arctic areas, have the lowest macrophyte alpha-diversity (S-T <20 species/gridcell). At ecozone scale, macrophyte species endemism is pronounced, though with a > 5-fold difference between the most species-rich (Neotropics) and species-poor (Palaearctic) ecozones. Our findings strongly support the assertion that small-ranged species constitute most of Earth's species diversity.