Research Topics
| Otto SeppäläSummaryAffiliation: Swiss Federal Institute of Aquatic Science and Technology Country: Switzerland Publications
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Detail Information
Publications
Reciprocal interaction matrix reveals complex genetic and dose-dependent specificity among coinfecting parasitesOtto Seppälä
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland
Am Nat 180:306-15. 2012..gasterostei. The relative magnitude of these effects, however, depended on the exposure dose, suggesting that ecological factors can modify genetic interactions between parasites...- Food makes you a target: disentangling genetic, physiological, and behavioral effects determining susceptibility to infectionOtto Seppälä
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland ETH Zürich, Institute of Integrative Biology, 8092 Zurich, Switzerland
Evolution 65:1367-75. 2011..Feeding treatments also affected the family-level variation in snail susceptibility, suggesting that the relative susceptibility of host genotypes was context dependent... - Eye fluke-induced cataracts in natural fish populations: is there potential for host manipulation?O Seppälä
Eawag, Swiss Federal Institute of Aquatic Science and Technology, and ETH Zurich, Institute of Integrative Biology, Uberlandstrasse 133, PO Box 611, CH 8600 Dubendorf, Switzerland
Parasitology 138:209-14. 2011..However, we observed such cataracts only in species with the highest parasite abundances, which suggests that only certain hosts may be strongly affected by the infection... 
Immune defence under extreme ambient temperatureOtto Seppälä
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland
Biol Lett 7:119-22. 2011..This suggests that the effect of high temperature on snail susceptibility to infections may vary across different pathogens because different components of invertebrate immune defence have different roles in resistance...- Maintenance of genetic variation in immune defense of a freshwater snail: role of environmental heterogeneityOtto Seppälä
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland, and ETH Zurich, Institute of Integrative Biology IBZ, 8092 Zurich, Switzerland
Evolution 64:2397-407. 2010..Thus, our findings support the idea that environmental heterogeneity may promote maintenance of genetic variation in immune defense, but also suggest that different immune traits might not respond similarly to environmental variation... - Interactions among co-infecting parasite species: a mechanism maintaining genetic variation in parasites?Otto Seppälä
Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland
Proc Biol Sci 276:691-7. 2009..gasterostei strains was independent of exposure type. These results suggest that interactions among parasite species may be strain specific and potentially promote maintenance of genetic polymorphism in parasite populations... - Host manipulation as a parasite transmission strategy when manipulation is exploited by non-host predatorsOtto Seppälä
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland
Biol Lett 4:663-6. 2008..Therefore, nonspecific host manipulation may evolve in nature, but the adaptive value of a certain manipulation strategy can vary among different parasite populations depending on the variation in initial predation risk... - Host manipulation by parasites in the world of dead-end predators: adaptation to enhance transmission?Otto Seppälä
Department of Aquatic Ecology ECO, Eawag, Uberlandstrasse 133, PO Box 611, 8600 Dubendorf, Switzerland
Proc Biol Sci 275:1611-5. 2008..However, the increased predation vulnerability of the infected isopods was higher towards perch. This suggests that, despite the costs due to non-host predation, host manipulation may still be advantageous for the parasite... - Phenotypic variation in infectivity of Diplostomum spathaceum cercariae within a populationO Seppälä
Department of Biological and Environmental Science, University of Jyvaskyla, Finland
J Parasitol 93:1244-6. 2007..5% and 87.5%. Depending on the source of variation, this may have important ecological and evolutionary implications for both natural parasite populations and those occurring in aquaculture... - Eye fluke infection and lens size reduction in fish: a quantitative analysisAnssi Karvonen
Department of Biological and Environmental Science, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
Dis Aquat Organ 80:21-6. 2008..It may also directly affect the overall optical performance of the lens and already impair host vision at low intensities of infection... 
Resistance against eye flukes: naïve versus previously infected fishAnssi Karvonen
Department of Biological and Environmental Science, University of Jyvaskyla, P O Box 35, 40014, Jyvaskyla, Finland
Parasitol Res 95:55-9. 2005..0-89.1%. Parasite establishment was also affected by fish host density as fewer parasites were found in fish in higher densities. The implications of these results for the fish-farming industry and fish-stocking protocols are discussed...- Host immunization shapes interspecific associations in trematode parasitesAnssi Karvonen
Department of Biological and Environmental Science, Centre of Excellence in Evolutionary Research, University of Jyvaskyla, Jyvaskyla, Finland
J Anim Ecol 78:945-52. 2009..This implies that correlative results suggesting non-interactive community structure in general may be obscured by the sequence of previous parasite exposure and corresponding dynamics of host immunization... - Dynamics of Diplostomum spathaceum infection in snail hosts at a fish farmAnssi Karvonen
Department of Biological and Environmental Science, University of Jyvaskyla, P O Box 35, 40014, Jyvaskyla, Finland
Parasitol Res 99:341-5. 2006..spathaceum, but also that snail prevention at farms could be conducted more efficiently by considering both size-dependent infection and the timing of cercarial release... - Transmission dynamics of a trematode parasite: exposure, acquired resistance and parasite aggregationAnssi Karvonen
Department of Biological and Environmental Science, P O Box 35, 40014 University of Jyväskylä, Finland
Parasitol Res 92:183-8. 2004..This is one of the few studies to demonstrate the development of resistance in fish against the parasite under natural conditions, and to attempt to separate exposure and susceptibility as causative agents of parasite aggregation...