Causes and consequences of invasions of aquatic ecosystems by non-native salmonids

Applicant Professor Dr. Robert Arlinghaus
Subject Area Ecology and Biodiversity of Plants and Ecosystems
Ecology and Biodiversity of Animals and Ecosystems, Organismic Interactions
Term from 2013 to 2017
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 243865477
 

Final Report

Final Report Year 2017

Final Report Abstract

Salmonids (salmon and trout family) are highly valuable and have been translocated widely outside their native range since the 19th century. Ecological conditions, as well as history and culture, vary considerably within Europe, which has affected the current invasion potential for non-native salmonids. SalmoInvade is a research project within the BiodivERsA-network including scientists and stakeholders from Sweden, Norway, Germany, France and Canada. The project uses a multidisciplinary approach to evaluate the consequences of salmonid invasions in Europe and provide recommendations for their management. Biological studies: Global meta-analyses and experiments show that native salmonids can be adversely affected both by non-native populations and non-native species, sometimes with cascading effects on stream ecosystems. Furthermore, angling can be targeted to remove bold individuals in an invasive population. Social studies: Analyses of the governance systems for fisheries in the five countries showed considerable cross-national differences in how the establishment of non-native salmonids through stocking is managed. Furthermore, surveys on the public perception of biological invasions in Europe, as well as among stocking decisions makers in France and Germany, revealed considerable cross-national differences in how non-native and native salmonids are valued, and how contextual factors influence local stocking decisions. Policy implications: (1) Strict guidelines for stocking and transfer of non-native salmonids should be implemented. (2) Monitoring and reporting should be improved. (3) Local decision-makers and authorities should be empowered to enforce regulations and to evaluate practices for salmonid stocking. (4) In order to conserve Salmonid biodiversity in Europe, it is important to consider the variation in public perception of native salmonids, and to (5) improve science - policy - public cooperation and dialogue.

Publications

DFG Programme Research Grants
International Connection France, Norway, Sweden
Participating Persons Dr. Julien Cucherousset; Kjetil Hindar; Professor Dr. Jörgen Johnsson