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10
10Introduction
30Showtheenvironmentalfactorswhichdifferentiatetheenvironmental
conditionsofmosses(Bryophyta),stoneworts(Charophyta)andvascular
plants(Cormophyta)asthemajormacrophytegroupsinthelakes0Itwas
hypothesisedthattheenvironmentalconditionshaveasimilarimpact
onspeciesrichness,frequency,abundanceandtoposequencyofthede-
scribedplantgroupsandtheircommunities0
40Examinetheeffectofabioticfactorsontheco-occurrenceofspeciesand
theirfrequency,aswellasabundanceanddiversityofcommunities0
50Determinethefactorsdecisiveinthedifferentiationofcommunitiesand
theirtoposequencewithinthelakesandamongthem0
Thesignificanceofenvironmentalregulatorswastestedinthecommunities
selectedbymeansoftheanalysisofsimilaritiesanddissimilaritiesofvegeta-
tionstructure(ANOSIM),whichisrarelyusedinaquaticplantecology0The
resultsofthisstudywillbroadentheknowledgeofthecausesandmech-
anismsbehindtheformationofmacrophytecommunitiesinlakesandthe
functioningoflakeecosystems0Moreover,theymightbeusedinpractice,es-
peciallyintheprotectionoftheenvironment,moreeffectivemanagement
ofitsresourcesaswellasrevitalisationofbiocenosesandrenaturalisationof
waterbodies0
Acknowledgements
IwouldliketothankProfessorJózefSzmejaforteachingmetheropesof
scientificresearchintolakefloraandvegetationandforhisinvaluablehelp
andkindnessshowntomewhilethisworkwasinprogress0Iamalsograte-
fultomycolleaguesDrKatarzynaBociąg,DrRafałChmara,DrKrzysztof
Gos,DrRyszardMarkowskiandMarekMerdalski,MSforourdiscussions
andtheirassistanceinthefieldwork0AllthestaffoftheDepartmentofPlant
EcologyattheUniversityofGdańskdeservetobethankedfortheirhelpand
kindness0IwouldalsoliketothankEmiliaBochenekandHazelAnnPearson
forthetranslationandproofreadingofthistext0Iamimmenselygratefulto
mywifeHalinaandsonPiotrfortheirhelpandsupport0Idedicatethisbook
tomyParents0
Thisworkwasfinancedfromthefollowinggrants:6PO4G02715,
6PO4G09918,3P04G06224,2PO4G00127,2PO4G06627,NN304411333andN
N304411638,andpartlyalsofromfivegrantsprovidedbytheUniversityof
GdańskandtheresourcesoftheDepartmentofPlantEcologyofthesame
university0
