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Chlorophyll - nutrients - Secchi disc relationships
Creator: Contributor:Polish Academy of Sciences. Institute of Ecology
Publisher:Polish Academy of Sciences. Institute of Ecology. Publishing Office
Place of publishing: Date issued/created: Description:Strony 327-337 : ilustracje ; 27 cm ; Bibliografia na stronach 335-337
Type of object: Subject and Keywords:in - lake phosphorus ; nitrogen ; lake trophic type ; mixing ; chlorophyll : PP ratio ; non-linear regression
Abstract:The relationships between SD, chlorophyll, total phosphorus and total nitrogen were analysed basing on data from 25 sites in 21 Great Mazurian Lakes collected during 12 years. Best fit for the data were reached when piecewise linear regression was used to approximate the relationship between chlorophyll and nutrient concentrations. The regression line divided the whole data set into two regions: lower, mesotrophic (chlorophyll < 20 mg m-3) where the response of chlorophyll to N and P was insignificant and higher, eutrophic (chlorophyll > 20 mg m-3) within which chlorophyll yield was proportional to nutrient increments. Except for trophic type, the relationship between chlorophyll and nutrients was affected by mixing type of lakes. No significant relationships between chlorophyll, nutrient concentrations and Secchi disc visibility were found in the shallow, polymictic lakes. Possible explanations for the observed effects including resuspension and grazing pressure on algae are proposed.
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Digitizing institution:Muzeum i Instytut Zoologii Polskiej Akademii Nauk
Original in:Biblioteka Muzeum i Instytutu Zoologii PAN
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