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application[1,20,29,33,35,36,41].ResearchersoftenusethemeanTSI’svalueto
estimatethetrophyleveloflakeecosystems[1,2,38].However,itisnotadvisable
tounequivocallydecideonthetrophylevelofalakeonlyonthebasisoftheaverage
valueoftheindicator[6].Thereareoftensignificantdiferencesbetweenthevalues
ofindividualindices[15,21,27].Usually,TSI
TPishigherthanothertrophyindices.This
phenomenonwasreportedbyPykaetal.,(2007),KöklüandAlkiș(2021),Siweketal.,
(2018)andJarosiewiczetal.,(2011).Meanwhile,forthelakeBlidinje[19]orthelake
Burullus[1]theTSI
SDwasmuchhigherthanotherindices.Inthestudiedlakesthere
wasasignificantrelationshipbetweenthevaluesofwatertransparency,concentra-
tionofchlorophyllaandnutrientsconcentration.Thisindicatesthateachoneofthe
fourparameterscouldbeagoodpredictivetoolfortherestoftheparametrs[28],
whichcansuggestthatthestudiedlakescontinuetheirevolutioninaharmonius
manner.Consequently,theTSIindicesofstudiedSouthBalticSeashorelakeswere
rathersimilarandsignificantlycorrelated.
AccordingtoCarlson(1991),substractingTSI
ChlfromanyotherTSIwillequalzero
ornearlyso,withonlyrandomvariationcausingdeviationfromzero.Deviationsof
TSI
ChlfromtheTSI
TP(TSI
TN)indicatedegreesofphosphorus(nitrogen)limitation,de-
viationsofTSI
ChlfromTSI
SDindicatethedegreeoflightpenetrationrelativetothe
numerandsizeofparticle.Inthecase,whenboth:TSI
TP(TSI
TN)andTSI
SDdeviate
fromchlorophyllbutarethemselvescorrelated,thennon-algalturbidityisindicated
[5].Figure4illustratethedeviationsintrophicstateindicesofstudiedlakes.
Fig.4.DiagramsofdeviationsbetweenCarlsonindices;squaresineachdiagramdefinethetype
oflimitingfactor
Source:ownresearch.
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