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Responses of food web to hypolimnetic aeration in Lake Vesijärvi

dc.contributor.authorRuuhijärvi, Jukka
dc.contributor.authorMalinen, Tommi
dc.contributor.authorKuoppamäki, Kirsi
dc.contributor.authorAla-Opas, Pasi
dc.contributor.authorVinni, Mika
dc.contributor.departmentid4100110910
dc.contributor.departmentid4100110910
dc.contributor.orcidhttps://orcid.org/0000-0001-8275-2190
dc.contributor.organizationLuonnonvarakeskus
dc.date.accessioned2020-07-22T12:54:34Z
dc.date.accessioned2025-05-28T13:04:37Z
dc.date.available2020-07-22T12:54:34Z
dc.date.issued2020
dc.description.abstractWe studied the responses of a food web, especially fish and zooplankton, to summertime aeration, pumping of oxygen-rich epilimnetic water to the hypolimnion in Lake Vesijärvi, southern Finland. The aim of hypolimnetic aeration was to reduce internal loading of phosphorus from sediment. The population of smelt (Osmerus eperlanus L.), the main planktivore of the pelagial area, collapsed during the two 1st years of aeration due to increased temperature and low oxygen concentrations in the hypolimnion. The population recovered after the 4th year of hypolimnetic aeration, when oxygen conditions were improved. Despite elevated hypolimnetic temperature, smelt reached exceptionally high abundance, which led to a significant reduction in cladoceran body size. The density of perch (Perca fluviatilis L.) increased at first, but then decreased when the proportion of smelt and cyprinids increased. Biomasses of Daphnia decreased probably as a result of the disappearance of dark, low-oxygen deep-water refuge against fish predation and low availability of nutritionally high-quality algae. Occasionally filamentous cyanobacteria, such as turbulence tolerant Planktothrix agardhii (Gomont), were abundant, suggesting deteriorated food resources for zooplankton. The responses of food web were controversial with respect to the aim of the management, which was to prevent the occurrence of harmful algal blooms.
dc.description.vuosik2020
dc.format.bitstreamtrue
dc.format.pagerange4503-4523
dc.identifier.olddbid488598
dc.identifier.oldhandle10024/546062
dc.identifier.urihttps://jukuri.luke.fi/handle/11111/23291
dc.identifier.urlhttps://doi.org/10.1007/s10750-020-04319-6
dc.identifier.urnURN:NBN:fi-fe2020072247558
dc.language.isoen
dc.okm.corporatecopublicationei
dc.okm.discipline1172
dc.okm.discipline1181
dc.okm.internationalcopublicationei
dc.okm.openaccess2 = Hybridijulkaisukanavassa ilmestynyt avoin julkaisu
dc.okm.selfarchivedon
dc.publisherSpringer
dc.relation.doi10.1007/s10750-020-04319-6
dc.relation.ispartofseriesHydrobiologia
dc.relation.issn0018-8158
dc.relation.issn1573-5117
dc.relation.numberinseries21
dc.relation.volume847
dc.rightsCC BY 4.0
dc.source.identifierhttps://jukuri.luke.fi/handle/10024/546062
dc.subject.ysoLake restoration
dc.subject.ysohypoxia
dc.subject.ysoArtificial circulation
dc.subject.ysoHydroacoustics
dc.subject.ysoCladocera
dc.teh41005-00005900
dc.titleResponses of food web to hypolimnetic aeration in Lake Vesijärvi
dc.typepublication
dc.type.okmfi=A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä|sv=A1 Originalartikel i en vetenskaplig tidskrift|en=A1 Journal article (refereed), original research|
dc.type.otherHydrobiologia
dc.type.versionfi=Publisher's version|sv=Publisher's version|en=Publisher's version|

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