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dc.date.accessioned2018-07-05T14:25:02Z
dc.date.available2018-07-05T14:25:02Z
dc.date.created2017-12-06T14:43:57Z
dc.date.issued2017
dc.identifier.citationWærvågen, Svein Birger Andersen, Tom . Seasonal quantitative dynamics and ecology of pelagic rotifers in an acidified boreal lake. Journal of limnology. 2017
dc.identifier.urihttp://hdl.handle.net/10852/62027
dc.description.abstractLake Gjerstadvann is a dimictic, oligotrophic, slightly acidified boreal lake in southern Norway (northwest Europe). The planktonic rotifer community of this lake was studied quantitatively during one year in order to investigate the impacts of the local environment and biotic interactions on seasonal succession and habitat selection. Pure suspension feeders (mainly Keratella spp., Conochilus spp., and Kellicottia longispina) together with raptorial graspers or specialised feeders (mainly Polyarthra spp. and Collotheca spp.) dominated the rotifer community over prolonged periods, whereas carnivorous/omnivorous species (mainly Asplanchna priodonta) were extremely uncommon. Low bicarbonate buffering capacity resulted in a distinctive seasonal oscillating pH between 5.0 and 5.6, defining a special acid-transition lake category. The pH values were highest in the productive period during summer, and lowest during ice break-up coinciding with the peak reactive aluminium concentrations of 250-300 µg L–1. As in typical Norwegian boreal perch lakes, the most abundant cladoceran was Bosmina longispina due to perch predation on the genus Daphnia. Rotifer community structure was significantly related to temperature and oxygen (P=0.001 and P=0.022), illustrating the important effects of the seasonal cycle and vertical density stratification. The most significant competition indicator species were B. longispina and Eudiaptomus gracilis (both with P=0.001). A variance partitioning indicated that 14% of the total community composition variance could only be explained by biotic interactions, while 19% of the variance could be attributed to environmental gradients. Of the variance, 23% could not be resolved between biotic interactions and environmental gradients, while a residual of 44% was not explainable by any of the variables. Acid conditions alone cannot account for all the observed changes in the rotifer community of this lake with low humic content, since resource limitation and food competition are also important factors shaping rotifer population dynamics and the community structure.en_US
dc.languageEN
dc.rightsAttribution-NonCommercial 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.titleSeasonal quantitative dynamics and ecology of pelagic rotifers in an acidified boreal lakeen_US
dc.typeJournal articleen_US
dc.creator.authorWærvågen, Svein Birger
dc.creator.authorAndersen, Tom
cristin.unitcode185,15,29,70
cristin.unitnameSeksjon for akvatisk biologi og toksikologi
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin1523662
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of limnology&rft.volume=&rft.spage=&rft.date=2017
dc.identifier.jtitleJournal of limnology
dc.identifier.volume77
dc.identifier.issue1
dc.identifier.startpage147
dc.identifier.endpage163
dc.identifier.pagecount30
dc.identifier.doihttp://dx.doi.org/10.4081/jlimnol.2017.1685
dc.identifier.urnURN:NBN:no-64629
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn1129-5767
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/62027/4/1685-11197-3-PB.pdf
dc.type.versionPublishedVersion


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