- Leprieur, Fabien
- Caleta, Marko
- Olden, Julian D.
- Marr, Sean M.
- Sanda, Radek
- Tarkan, A. Serhan
- Arismendi, Ivan
- Nocita, Annamaria
- Morgan, David L.
- Garcia-Berthou, Emili
|Abstract or Summary
- Mediterranean-climate regions (med-regions) are global hotspots of endemism 40 facing mounting
environmental threats associated with human-related activities, including the ecological impacts associated with
non-native species introductions. We review freshwater fish introductions across med-regions to evaluate the
influences of non-native fishes on the biogeography of taxonomic and functional diversity. Our synthesis
revealed that 136 freshwater fish species (26 families, 13 orders) have been introduced into med-regions
globally. These introductions, and local extirpations, have increased taxonomic and functional faunal similarity
among regions by an average of 7.5% (4.6-11.4%; Jaccard) and 7.2% (1.4-14.0%; Bray-Curtis), respectively.
Faunal homogenization was highest in Chile and the western Med Basin, whereas sw Cape and the Aegean Sea
drainages showed slight differentiation (decrease in faunal similarity) over time. At present, fish faunas of
different med-regions have widespread species in common (e.g. Gambusia holbrooki, Cyprinus carpio,
Oncorhynchus mykiss, Carassius auratus, and Micropterus salmoides) which are typically large-bodied, non
migratory, have higher physiological tolerance, and display fast population growth rates. Our findings suggest
that intentional and accidental introductions of freshwater fish have dissolved dispersal barriers and significantly
changed the present-day biogeography of med-regions across the globe. Conservation challenges in med-regions
include understanding the ecosystem consequences of non-native species at macro-ecological scales.
- Marr, S. M., Olden, J. D., Leprieur, F., Arismendi, I., Ćaleta, M., Morgan, D. L., . . . García-Berthou, E. (2013). A global assessment of freshwater fish introductions in Mediterranean-climate regions. Hydrobiologia, 719(1), 317-329. doi:10.1007/s10750-013-1486-9
|Funding Statement (additional comments about funding)