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dc.contributor.authorKeva, Ossi
dc.contributor.authorTang, Patrik
dc.contributor.authorKäkelä, Reijo
dc.contributor.authorHayden, Brian
dc.contributor.authorTaipale, Sami J.
dc.contributor.authorHarrod, Chris
dc.contributor.authorKahilainen, Kimmo K.
dc.date.accessioned2019-08-29T09:48:57Z
dc.date.available2019-08-29T09:48:57Z
dc.date.issued2019
dc.identifier.citationKeva, O., Tang, P., Käkelä, R., Hayden, B., Taipale, S. J., Harrod, C., & Kahilainen, K. K. (2019). Seasonal changes in European whitefish muscle and invertebrate prey fatty acid composition in a subarctic lake. <i>Freshwater Biology</i>, <i>64</i>(11), 1908-1920. <a href="https://doi.org/10.1111/fwb.13381" target="_blank">https://doi.org/10.1111/fwb.13381</a>
dc.identifier.otherCONVID_32518405
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/65365
dc.description.abstractAmbient light and temperature show extreme seasonal variation in subarctic lakes due to the midnight sun period in summer and cold polar night period in winter. These changes have clear impacts on fish feeding and reproduction cycles, potentially affecting the fatty acid (FA) composition of muscle. Despite extensive research into fish FA over recent decades, we know little about intra‐annual changes of fish FA profile and content. We studied intra‐annual changes in the FA profile (mol%) and content (mg g‐1 dry weight) of sexually mature European whitefish (Coregonus lavaretus) muscle in a large and deep subarctic lake located in northern Fennoscandia. We collected fish, zooplankton, and benthic macroinvertebrate samples during 3 ice‐covered months, including December (during whitefish spawning), and 3 open‐water months. Fish size, age, sex, stomach content and fullness, and gonadosomatic index were also assessed as co‐variates. Whitefish changed diet from benthic macroinvertebrates in winter to zooplankton in summer. Generally, whitefish somatic growth was slow and most energy was used for gonad growth. Zooplankton had higher total content and different profile of FA compared to benthic macroinvertebrates. Increased zooplanktivory in summer was detected with higher α‐linolenic acid (ALA, 18:3n‐3) and stearidonic acid (SDA, 18:4n‐3) percentage and content as well as increased the ratio of polyunsaturated FAs (PUFAs) of n‐3 and n‐6 family (n‐3/n‐6 ratio) in fish muscle. Whitefish gonadal growth and development occur during the summer growing season and continue until the initiation of spawning in early winter. We found that the content of physiologically crucial PUFA, eicosapentaenoic acid (EPA, 20:5n‐3), docosahexaenoic acid (DHA, 22:6n‐3), and arachidonic acid (ARA, 20:4n‐6) decreased by c. 60% between late summer and the spawning period in early winter. After spawning, total FA content of whitefish muscle increased rapidly, reaching the maximum recorded level in mid‐summer. Intra‐annual changes in whitefish muscle FA profiles and contents were modified both by available diet and reproductive phase; however, reproductive physiology was clearly a stronger driver of the changes in muscle FA composition. Results suggest marked changes in intra‐annual FA composition of fish muscle, an important factor that should be considered in future studies and especially in long term monitoring programs. Future studies are needed to determine whether these inter‐annual FA patterns revealed in this study can be extended to different regions and to e.g. adipose or spring spawning species.en
dc.format.mimetypeapplication/pdf
dc.languageeng
dc.language.isoeng
dc.publisherWiley-Blackwell Publishing Ltd.
dc.relation.ispartofseriesFreshwater Biology
dc.rightsIn Copyright
dc.subject.otherannual
dc.subject.otherdiet shift
dc.subject.otherhighly unsaturated fatty acids
dc.subject.othern‐3/n‐6
dc.subject.otherspawning
dc.subject.otherwinter ecology
dc.titleSeasonal changes in European whitefish muscle and invertebrate prey fatty acid composition in a subarctic lake
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201908293971
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.contributor.oppiaineAkvaattiset tieteetfi
dc.contributor.oppiaineAquatic Sciencesen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.format.pagerange1908-1920
dc.relation.issn0046-5070
dc.relation.numberinseries11
dc.relation.volume64
dc.type.versionacceptedVersion
dc.rights.copyright© 2019 John Wiley & Sons Ltd.
dc.rights.accesslevelopenAccessfi
dc.subject.ysokutu
dc.subject.ysovaihtelu
dc.subject.ysosiika
dc.subject.ysorasvahapot
dc.subject.ysovuodenajat
dc.subject.ysoravinto
dc.subject.ysotalvehtiminen
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p16469
jyx.subject.urihttp://www.yso.fi/onto/yso/p8653
jyx.subject.urihttp://www.yso.fi/onto/yso/p18578
jyx.subject.urihttp://www.yso.fi/onto/yso/p4800
jyx.subject.urihttp://www.yso.fi/onto/yso/p1199
jyx.subject.urihttp://www.yso.fi/onto/yso/p3671
jyx.subject.urihttp://www.yso.fi/onto/yso/p3061
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.relation.doi10.1111/fwb.13381
jyx.fundinginformationK.K.K. was supported by Academy of Finland (projects 1140903, 1268566) and European Regional Developmental Fund (A30205). C.H. was supported by Núcleo Milenio INVASAL funded by Chile's Government Program, Iniciativa Cientifica Milenio from Ministerio de Economia, Fomento y Turismo and B.H. was supported by small grants of Fisheries Society of British Isles. University of Jyväskylä kindly provided a graduate fund to O.K.


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