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dc.contributor.authorDupont, Nicolaseng
dc.contributor.authorAksnes, Dag Lorentseng
dc.description.abstractSecchi depth is a valuable proxy for detecting long term changes in the water clarity of oceanic and coastal ecosystems. We analyse approximately 40 000 observations, which are available from ICES, from the Baltic Sea and the North Sea in the 20th century. Our results suggest pronounced effects of bottom depth and distance to coast on Secchi depth, and we account for this topographical effect in an assessment of the long term change in water clarity. Our results suggest a centennial Secchi depth shoaling of 3.2 ± 0.2 and 5.8 ± 0.6 m in areas that are shallower and deeper than 100 m in the Baltic Sea. For the North Sea the corresponding numbers were 1.8 ± 0.3 and 5.2 ± 0.9 m. We discuss potential ecosystem effects involving pronounced reductions in photic habitats and reduced visibility for visual predators. We suggest that the role of long term variations in colour dissolved organic matter (CDOM) on the transparency in the Baltic Sea and North Sea deserves future attention.en_US
dc.rightsAttribution-NonCommercial-ShareAlike CC BY-NC-SAeng
dc.subjectBaltic Seaeng
dc.subjectNorth Seaeng
dc.subjectSecchi deptheng
dc.subjectwater clarityeng
dc.titleCentennial changes in water clarity of the Baltic Sea and the North Seaen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2013 The Authorsen_US
dc.source.journalEstuarine, Coastal and Shelf Science
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Zoology and botany: 480::Ecology: 488en_US
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488nob

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