Global biogeographical regions of freshwater fish species

Type Article
Date 2019-11
Language English
Author(s) Leroy Boris1, Dias Murilo S.1, 2, Giraud Emilien1, Hugueny Bernard3, Jézéquel Céline3, Leprieur Fabien4, 5, Oberdorff Thierry3, Tedesco Pablo A3
Affiliation(s) 1 : Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques Muséum National d'Histoire Naturelle, CNRS, IRD, SU, UCN, UA, Paris ,France
2 : Departamento de Ecologia, Instituto de Ciências Biológicas Universidade de Brasília (UnB) ,Brasília‐DF Brazil
3 : UMR5174 EDB (Laboratoire Evolution et Diversité Biologique) CNRS, IRD253, UPS, Université Paul Sabatier, Toulouse, France
4 : UMR MARBEC (CNRS, IRD, IFREMER, UM), Université de Montpellier, Montpellier, France
5 : Institut Universitaire de France Paris, France
Source Journal Of Biogeography (0305-0270) (Wiley), 2019-11 , Vol. 46 , N. 11 , P. 2407-2419
DOI 10.1111/jbi.13674
WOS© Times Cited 41
Keyword(s) actinopterygians, biogeographical regions, biogeography, bioregionalization, bioregions, dispersal, freshwater fish, transition zones, vicariance, zoogeographical regions


To define the major biogeographical regions and transition zones for freshwater fish species.


Strictly freshwater species of actinopterygian fish (i.e. excluding marine and amphidromous fish families).


We based our bioregionalization on a global database of freshwater fish species occurrences in drainage basins, which, after filtering, includes 11,295 species in 2,581 basins. On the basis of this dataset, we generated a bipartite (basin‐species) network upon which we applied a hierarchical clustering algorithm (the Map Equation) to detect regions. We tested the robustness of regions with a sensitivity analysis. We identified transition zones between major regions with the participation coefficient, indicating the degree to which a basin has species from multiple regions.


Our bioregionalization scheme showed two major supercontinental regions (Old World and New World, 50% species of the world and 99.96% endemics each). Nested within these two supercontinental regions lie six major regions (Nearctic, Neotropical, Palearctic, Ethiopian, Sino‐Oriental and Australian) with extremely high degrees of endemism (above 96% except for the Palearctic). Transition zones between regions were of limited extent compared to other groups of organisms. We identified numerous subregions with high diversity and endemism in tropical areas (e.g. Neotropical), and a few large subregions with low diversity and endemism at high latitudes (e.g. Palearctic).

Main conclusions

Our results suggest that regions of freshwater fish species were shaped by events of vicariance and geodispersal which were similar to other groups, but with freshwater‐specific processes of isolation that led to extremely high degrees of endemism (far exceeding endemism rates of other continental vertebrates), specific boundary locations and limited extents of transition zones. The identified bioregions and transition zones of freshwater fish species reflect the strong isolation of freshwater fish faunas for the past 10–20 million years. The extremely high endemism and diversity of freshwater fish fauna raises many questions about the biogeographical consequences of current introductions and extinctions.

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Leroy Boris, Dias Murilo S., Giraud Emilien, Hugueny Bernard, Jézéquel Céline, Leprieur Fabien, Oberdorff Thierry, Tedesco Pablo A (2019). Global biogeographical regions of freshwater fish species. Journal Of Biogeography, 46(11), 2407-2419. Publisher's official version : , Open Access version :