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Euryhalinity of Ponto-Caspian invaders in their native and introduced regions
Pauli, N.-C.; Briski, E. (2018). Euryhalinity of Ponto-Caspian invaders in their native and introduced regions. Aquat. Invasions 13(Spec. Iss. 4): 439-447. https://doi.org/10.3391/ai.2018.13.4.02
In: Aquatic Invasions. Regional Euro-Asian Biological Invasions Centre (REABIC): Helsinki. ISSN 1798-6540; e-ISSN 1818-5487
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| Author keywords |
salinity tolerance; Ponto-Caspian non-indigenous species; salinity barrier; salinity of native region; alinity of introduced region |
| Abstract |
In the past several decades, Ponto-Caspian species have established in freshwater and brackish habitats of the North and Baltic Seaand Great Lakes-St. Lawrence River region in much higher numbers than expected based on introduction effort (i.e. shipping frequency) and environmental conditions between these regions. Several studies have suggested that Ponto-Caspian taxa are euryhaline and mightbe able to adapt rapidly to changing salinity conditions, and therefore may be more successful colonizers than species from other regions.To determine the realized niche in the native and introduced habitats of Ponto-Caspian invaders and to assess whether they have expandedtheir salinity tolerance during the invasion process, we conducted a literature search to assess the salinity ranges of 55 Ponto-Caspianspecies in their native and introduced ranges. Our results confirmed that the majority of those species occupied a wide range of salinityin their native and introduced habitats. Approximately 50% of species were reported from both freshwater and brackish habitats (0–18 PSU) in their native region, occupying a salinity range of at least 10 PSU difference. In general, the number of species tended to declineas salinity increased in both native and introduced habitats. More than 90% of Ponto-Caspian invaders occupied freshwater (< 0–0.5 PSU) habitats, while 18% did not occur above 18 PSU. Overall, 46% of species were reported from a narrower salinity range in their introducedcompared to their native region. Consequently, our study revealed significantly broader salinity ranges in native compared to introducedhabitats. As our results suggest that the majority of Ponto-Caspian invaders occupy freshwater and brackish habitats in their native region, the recent numerous invasions of freshwater and brackish areas by these species should not be a surprise. Therefore, managers and policymakers should take into account that the majority of Ponto-Caspian invaders originate from fresh water or low salinities and develop newregulations to prevent future invasions from the Ponto-Caspian region, as well as from areas highly invaded by Ponto-Caspian taxa suchas Northern Europe. |
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