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dc.contributor.authorKnudsen, Rune
dc.contributor.authorEloranta, Antti
dc.contributor.authorSiwertsson, Anna
dc.contributor.authorPaterson, Rachel A.
dc.contributor.authorPower, Michael
dc.contributor.authorSandlund, Odd Terje
dc.date.accessioned2020-02-12T13:24:17Z
dc.date.available2020-02-12T13:24:17Z
dc.date.issued2019-04-26
dc.description.abstractNiche diversification of polymorphic Arctic charr can be altered by multiple anthropogenic stressors. The opossum-shrimp (<i>Mysis relicta</i>) was introduced to compensate for reduced food resources for fish following hydropower operations in Lake Limingen, central Norway. Based on habitat use, stomach contents, stable isotopes (δ<sup>13</sup>C, δ<sup>15</sup>N) and trophically transmitted parasites, the zooplanktivorous upper water-column dwelling ‘normal’ morph was clearly trophically separated from two sympatric deep-water morphs (the ‘dwarf’ and the ‘grey’) that became more abundant with depth (> 30 m). Mysis dominated (50–60%) charr diets in deeper waters (> 30 m), irrespective of morph. <i>Mysis</i> and/or zooplankton prey groups caused high dietary overlap (> 54%) between the ‘dwarf’ morph and the two other ‘normal’ and ‘grey’ morphs. After excluding <i>Mysis</i>, the dietary overlap dropped to 34% between the two profundal morphs, as the ‘dwarf’ fed largely on deep-water zoobenthos (39%), while the ‘grey’ morph fed on fish (59%). The time-integrated trophic niche tracers (trophically transmitted parasites and stable isotopes) demonstrated only partial dietary segregation between the two deep-water morphs. The high importance of <i>Mysis</i> in Arctic charr diets may have reduced the ancestral niche segregation between the deep-water morphs and thereby increased their resource competition and potential risk of hybridization.en_US
dc.descriptionThis is a post-peer-review, pre-copyedit version of an article published in <i>Hydrobiologia</i>. The final authenticated version is available online at <a href=https://doi.org/10.1007/s10750-019-3953-4>https://doi.org/10.1007/s10750-019-3953-4</a>.en_US
dc.identifier.citationKnudsen R, Eloranta A, Siwertsson A, Paterson RA, Power MJ, Sandlund OT. Introduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphs. Hydrobiologia. 2019;840(1):245-260en_US
dc.identifier.cristinIDFRIDAID 1694450
dc.identifier.doi10.1007/s10750-019-3953-4
dc.identifier.issn0018-8158
dc.identifier.issn1573-5117
dc.identifier.urihttps://hdl.handle.net/10037/17378
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.relation.journalHydrobiologia
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/663830/EU/Strengthening International Research Capacity in Wales/SIRCIW/en_US
dc.relation.urihttp://hdl.handle.net/11250/2596607
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright Springer Nature Switzerland AG 2019en_US
dc.subjectVDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.subjectVDP::Mathematics and natural scienses: 400::Zoology and botany: 480en_US
dc.titleIntroduction of Mysis relicta (Mysida) reduces niche segregation between deep-water Arctic charr morphsen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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