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dc.contributor.authorVesterinen, Jussi
dc.date.accessioned2017-04-18T12:49:47Z
dc.date.available2017-04-18T12:49:47Z
dc.date.issued2017
dc.identifier.isbn978-951-39-7038-3
dc.identifier.otheroai:jykdok.linneanet.fi:1694929
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/53615
dc.description.abstractLittoral zones in lakes are among the most productive habitats in the world, but have been seriously understudied, as most limnological studies have concerned only pelagic habitats. The likely importance of littoral zones in clear lakes is widely acknowledged, but in contrast their role in dystrophic humic lakes has generally been assumed to be minor. In this thesis, littoral importance in whole-lake metabolism was studied in small and highly humic lakes in Southern Finland, where Lake Mekkojärvi was the principal study lake. Primary production (PP) measurements revealed that littoral periphyton, growing on surrounding aquatic vegetation, can dominate the whole-lake PP, and the highly autotrophic littoral can help balance the whole-lake metabolism or even shift these lakes to occasional net autotrophy. Measurements of bacterial production (BP) within the littoral epiphytic biofilms and in the pelagic zone revealed overall pelagic dominance of BP in Mekkojärvi. However, epiphytic bacteria made a strong contribution, and their highest production rates were almost equal to those of pelagic bacterioplankton. Stable isotope analysis revealed that periphyton can be an important food resource for the consumers in humic lakes. The naturally fishless Mekkojärvi was divided into two basins by a plastic curtain and perch (Perca fluviatilis) were introduced to one basin while the other remained fishless. The results indicate that the pelagic zooplankton do not appreciably utilize littoral prey under the fishless state, but that fish can promote coupling of the pelagic and littoral food webs by directly utilizing littoral prey or by inducing predation pressure on zooplankton, which drives them to the littoral to seek refuge from predation. This study emphasizes the important role of the littoral in whole-lake processes in humic lakes, and suggests that when the littoral is taken into account many small humic lakes are actually more productive and not as heterotrophic as is commonly supposed.
dc.format.extent1 verkkoaineisto (120 sivua) : kuvitettu, karttoja
dc.language.isoeng
dc.publisherUniversity of Jyväskylä
dc.relation.ispartofseriesJyväskylä studies in biological and environmental science
dc.relation.isversionofYhteenveto-osa ja 4 eripainosta julkaistu myös painettuna.
dc.subject.otherwhole-lake primary production
dc.subject.otherstable isotopes
dc.subject.otherperiphyton
dc.subject.otherheterotrophy
dc.subject.otherbacterial production
dc.subject.otherautotrophy
dc.titleLittoral energy pathways in highly humic boreal lakes
dc.typeDiss.fi
dc.identifier.urnURN:ISBN:978-951-39-7038-3
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Mathematics and Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineAkvaattiset tieteetfi
dc.relation.issn1456-9701
dc.relation.numberinseries329
dc.rights.accesslevelopenAccessfi
dc.subject.ysorantavyöhykkeet
dc.subject.ysojärvet
dc.subject.ysohumusjärvet
dc.subject.ysoboreaalinen vyöhyke
dc.subject.ysoperifyton
dc.subject.ysolevät
dc.subject.ysobakteerit
dc.subject.ysoplankton
dc.subject.ysoperustuotanto
dc.subject.ysoravintoverkot
dc.subject.ysohiilen kierto


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