Heavy loads of parasitic freshwater pearl mussel (Margaritifera margaritifera L.) larvae impair foraging, activity and dominance performance in juvenile brown trout (Salmo trutta L.)

2016 ◽  
Vol 27 (1) ◽  
pp. 70-77 ◽  
Author(s):  
Karl Filipsson ◽  
Tina Petersson ◽  
Johan Höjesjö ◽  
John J. Piccolo ◽  
Joacim Näslund ◽  
...  
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Margaritifera Margaritifera ◽  
Foraging Activity ◽  
Pearl Mussel ◽  
Freshwater Pearl Mussel ◽  
Brown Trout Salmo Trutta ◽  
Juvenile Brown Trout ◽  
Heavy Loads

Do individual Activity Patterns of Brown Trout (Salmo trutta) alter the Exposure to Parasitic Freshwater Pearl Mussel (Margaritifera margaritifera) Larvae?

Ethology ◽  
2016 ◽  
Vol 122 (9) ◽  
pp. 769-778 ◽  
Author(s):  
Niklas Wengström ◽  
Fredrik Wahlqvist ◽  
Joacim Näslund ◽  
David Aldvén ◽  
Libor Závorka ◽  
...  
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Activity Patterns ◽  
Margaritifera Margaritifera ◽  
Pearl Mussel ◽  
Individual Activity ◽  
Freshwater Pearl Mussel ◽  
Brown Trout Salmo Trutta

scholarly journals Higher mortality of the less suitable brown trout host compared to the principal Atlantic salmon host when infested with freshwater pearl mussel (Margaritifera margaritifera) glochidia

2021 ◽  
Author(s):  
Janhavi Marwaha ◽  
Per Johan Jakobsen ◽  
Sten Karlsson ◽  
Bjørn Mejdell Larsen ◽  
Sebastian Wacker
Keyword(s):  
Atlantic Salmon ◽  
Brown Trout ◽  
Host Species ◽  
Salmo Trutta ◽  
The Other ◽  
Margaritifera Margaritifera ◽  
Pearl Mussel ◽  
Suitable Host ◽  
Freshwater Pearl Mussel ◽  
Host Interaction

AbstractThe freshwater pearl mussel (Margaritifera margaritifera) is a highly host-specific parasite, with an obligate parasitic stage on salmonid fish. Atlantic salmon (Salmo salar) and brown trout (Salmo trutta f. trutta and Salmo trutta f. fario) are the only hosts in their European distribution. Some M. margaritifera populations exclusively infest either Atlantic salmon or brown trout, while others infest both hosts with one salmonid species typically being the principal host and the other a less suitable host. Glochidial abundance, prevalence and growth are often used as parameters to measure host suitability, with the most suitable host species displaying the highest parameters. However, it is not known if the degree of host specialisation will negatively influence host fitness (virulence) among different host species. In this study we examined the hypothesis that glochidial infestation would result in differential virulence in two salmonid host species and that lower virulence would be observed on the most suitable host. Atlantic salmon and brown trout were infested with glochidia from two M. margaritifera populations that use Atlantic salmon as their principal host, and the difference in host mortality among infested and control (sham infested) fish was examined. Higher mortality was observed in infested brown trout (the less suitable host) groups, compared to the other test groups. Genetic assignment was used to identify offspring from individual mother mussels. We found that glochidia from individual mothers can infest both the salmonid hosts; however, some mothers displayed a bias towards either salmon or trout. We believe that the differences in host-dependent virulence and the host bias displayed by individual mothers were a result of genotype × genotype interactions between the glochidia and their hosts, indicating that there is an underlying genetic component for this parasite-host interaction.

scholarly journals Assessing Evolutionary Significant Units (ESU) of the Endangered Freshwater Pearl Mussel (Margaritifera margaritifera) in Southeast Norway on the Basis of Genetic Analysis

Genes ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 1061
Author(s):  
Arne N. Linløkken ◽  
Silje Garlie ◽  
Wenche Johansen ◽  
Robert C. Wilson
Keyword(s):  
Genetic Diversity ◽  
Salmo Trutta ◽  
Margaritifera Margaritifera ◽  
River Systems ◽  
Pearl Mussel ◽  
Freshwater Pearl Mussel ◽  
Recruitment Failure ◽  
Low Genetic Diversity ◽  
Brown Trout Salmo Trutta ◽  
Hardy Weinberg Equilibrium

A total of 312 specimens of freshwater pearl mussel (Margaritifera margaritifera) were sampled from 11 populations, located in four different river systems in Southeast Norway, and analyzed for 11 simple sequence repeat (SSR) (microsatellite) markers. All study populations have landlocked brown trout (Salmo trutta) as the only possible host. Several populations had experienced recruitment failure, probably due to low pH (about 6.0) and calcium concentration. STRUCTURE clustering analysis revealed two genetic clusters, of which one cluster occurred mainly in the western river systems, and totally dominated in one population (Fallselva (A-FAL)) that had higher genetic diversity than the others. Cluster 2 completely dominated in the populations of the eastern river systems, and all of them had low genetic diversity. Bottleneck events were indicated in all populations and the inbreeding coefficient FIS was significant in all populations, except for the southernmost population (Sørkedalselva (B-SØR)), which was the only population with genotypes in Hardy–Weinberg equilibrium. FIS were especially high in the populations of the eastern river systems, and maximum shell length was negatively correlated to FIS. If artificially breeding and stocking should become necessary for future preservation, it should be based on single populations; alternatively, the eastern populations should be based on cross-breeding of populations within the cluster to increase their genetic diversity.

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