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Salinity tolerance of rudd (Scardinius erythropthalmus) and risk for range expansion via brackish water

Solberg, Birgit
Master thesis
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URI
http://hdl.handle.net/11250/186975
Date
2013-03-22
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  • Master's theses (INA) [593]
Abstract
Rudd (Scardinius erythropthalmus) is a naturally occurring species in Norway which over the

last four decades has expanded its distribution far beyond its natural range. This invasion

represents a threat to local ecosystems and biodiversity. In order to find the most efficient

measures to prevent further spreading, it is crucial to find the spreading mechanism for this

species. It is assumed that anglers are responsible for introducing rudd to new water bodies,

but in this study I explore whether along-coast migration via brackish water may serve as an

additional route. Rudd from Storelva water system in southern Norway regularly performs

seawards migrations entering brackish water. In periods of high input of freshwater to the

fjord system, the brackish surface layer expands outwards, and salinities along the coast

decrease. To test whether brackish water represents a possible route for range expansion, the

salinity tolerance of rudd was tested in a laboratory experiment, and was found to be between

12 and 15 ppt. These results were applied in a risk model to determine the potential

distribution of rudd in relation to observed and simulated salinities in the Storelva-

Sandnesfjorden system. According to this model, there is high chance (given salinity

tolerance at 24 hrs) that rudd may spread all the way through the Storelva-Sandnesfjorden

system at medium (8 m3/sec) to high (100 m3/sec) Storelva discharges. Similar assessments

can be made for other water systems to predict the risk of range expansion along the Skagerak

coast of Norway.
Publisher
Norwegian University of Life Sciences, Ås

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