2010
DOI: 10.1007/s11270-010-0618-3
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Inferring Reference Conditions of Hypolimnetic Oxygen for Deteriorated Lake Mallusjärvi in the Cultural Landscape of Mallusjoki, Southern Finland Using Fossil Midge Assemblages

Abstract: Lake Mallusjärvi in the cultural landscape of Mallusjoki, southern Finland, suffers from algal blooms during summers and oxygen depletions during winters due to increased nutrient input resulting from extensive agricultural activities in the catchment. In this study, a sediment profile from the lake was studied using fossil midge (Diptera: Nematocera) analysis and a hypolimnetic oxygen transfer function was applied to establish baseline conditions of hypolimnetic oxygen. In addition, physical properties of the… Show more

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Cited by 19 publications
(7 citation statements)
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“…For example, changes in planktonic productivity during extreme cold and warm climate episodes influence the food availability in water column and hypolimnetic oxygen conditions during both winter and summer causing extirpation of certain cladoceran taxa (Nevalainen et al, 2016). In macrobenthic chironomids the indirect temperature mechanisms, such as the influence of temperature-driven ice cover development on winter hypolimnetic oxygen availability (Quinlan and Smol, 2002;Luoto and Nevalainen, 2011), are complemented by the direct influence of air temperature on the flying adults (Eggermont and Heiri, 2012). Increase in air and water temperature is predicted to result in an eutrophication-like pattern in lakes, with increased plankton biomass resulting from enhanced physiological rates and direct ecological processes (Visconti et al, 2008).…”
Section: Discussionmentioning
confidence: 99%
“…For example, changes in planktonic productivity during extreme cold and warm climate episodes influence the food availability in water column and hypolimnetic oxygen conditions during both winter and summer causing extirpation of certain cladoceran taxa (Nevalainen et al, 2016). In macrobenthic chironomids the indirect temperature mechanisms, such as the influence of temperature-driven ice cover development on winter hypolimnetic oxygen availability (Quinlan and Smol, 2002;Luoto and Nevalainen, 2011), are complemented by the direct influence of air temperature on the flying adults (Eggermont and Heiri, 2012). Increase in air and water temperature is predicted to result in an eutrophication-like pattern in lakes, with increased plankton biomass resulting from enhanced physiological rates and direct ecological processes (Visconti et al, 2008).…”
Section: Discussionmentioning
confidence: 99%
“…Both cores were split into 1‐cm slices in the field and then stored in plastic bags in a cold room. The Mallusjärvi core has been previously examined for fossil Chironomidae to quantitatively infer eutrophication (Luoto & Nevalainen ; Luoto & Raunio ) and Cladocera for investigating community and phenotypic (sexual reproduction, body size) responses during the eutrophication (Nevalainen & Luoto ). The Tiiläänjärvi core has been previously examined for fossil Chironomidae and to infer total phosphorus (TP) (Luoto & Ojala ).…”
Section: Methodsmentioning
confidence: 99%
“…Both the reconstructed and observed conditions at the present (O 2 ~6 mg l -1 ) suggest that there has been improvement in the oxygen state since the poor conditions of the 1990's. The current oxygen concentrations are rather typical for a baseline condition of a clay-turbid lake with intermediate human influence in the catchment (Luoto and Nevalainen 2011). The overall large variability in DO throughout the record and the apparent lack of a connection with the variations in the pelagic nutrient concentrations underscores the importance of other environmental controls, such as yearly variation in water column mixing, on hypolimnetic oxygen status.…”
Section: Limnological Developmentmentioning
confidence: 91%