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dc.contributor.authorHenriksen, Eirik Haugstvedt
dc.contributor.authorFrainer, André
dc.contributor.authorPoulin, Robert
dc.contributor.authorKnudsen, Rune
dc.contributor.authorAmundsen, Per-Arne
dc.date.accessioned2022-12-08T07:26:45Z
dc.date.available2022-12-08T07:26:45Z
dc.date.issued2022-11-22
dc.description.abstractHost density, host body size and ambient temperature have all been positively associated with increases in parasite infection. However, the relative importance of these factors in shaping long-term parasite population dynamics in wild host populations is unknown due to the absence of long-term studies. Here, we examine long-term drivers of gill lice (Copepoda) infections in Arctic charr (Salmonidae) over 32 years. We predicted that host density and body size and water temperature would all positively affect parasite population size and population growth rate. Our results show that fish size was the main driver of gill lice infections in Arctic charr. In addition, Arctic charr became infected at smaller sizes and with more parasites in years of higher brown trout population size. Negative intraguild interactions between brown trout and Arctic charr appear to drive smaller Arctic charr to seek refuge in deeper areas of the lake, thus increasing infection risk. There was no effect of host density on the force of infection, and the relationship between Arctic charr density and parasite mean abundance was negative, possibly due to an encounter-dilution effect. The population densities of host and parasite fluctuated independently of one another. Water temperature had negligible effects on the temporal dynamics of the gill lice population. Understanding long-term drivers of parasite population dynamics is key for research and management. In fish farms, artificially high densities of hosts lead to vast increases in the transmission of parasitic copepods. However, in wild fish populations fluctuating at natural densities, the surface area available for copepodid attachment might be more important than the density of available hosts.en_US
dc.identifier.citationHenriksen, Frainer, Poulin, Knudsen, Amundsen. Ectoparasites population dynamics are affected by host body size but not host density or water temperature in a 32-year long time series. Oikos. 2022en_US
dc.identifier.cristinIDFRIDAID 2089977
dc.identifier.doi10.1111/oik.09328
dc.identifier.issn0030-1299
dc.identifier.issn1600-0706
dc.identifier.urihttps://hdl.handle.net/10037/27726
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalOikos
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleEctoparasites population dynamics are affected by host body size but not host density or water temperature in a 32-year long time seriesen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)