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3010Frequencyandspeciesabundance
23
Nitellasyncarpa
Nitellatenuissima
Nitellopsisobtusa
Nis
Nit
Nito
385
21
7
0007
002
3063
88
2
5
3500
4200
3809
350410
390610
2704
5
100
60
90
35
20
30
Explanations:SD–standarddeviation,Me–median;F*–speciesfrequencyintotalsub-
mergedplantsamples(n=10603);F**–speciesfrequencyindepthzones0
Acceptednomenclatureofspecies
Mosses:Calliergongiganteum(Schimp0)Kindb0,Calliergonellacuspidata(Hedw0)Loeske,Chi-
loscyphuspolyanthos(L0)Corda,Cladopodiellafluitans(Nees)H0Buch,Dichelymacapillaceum
(Dicks0)Myrin,Drepanocladusaduncus(Hedw0)Warnst0,DrepanocladussordidusT
0Kop0,Fissi-
densfontanus(Bach0Pyl0)Steudel,FontinalisantipyreticaHedw0,FontinalisdelecarlicaSchimp0,
Leptodictyumriparium(Hedw0)Warnst0,Platyhypnidiumriparioides(Hedw0)Dixon,Riccardia
sp0div0,SphagnumcuspidatumEhrh0exHoffm0,SphagnumdenticulatumBrid0,Sphagnumfal-
lax(H0Klinggr0)H0Klinggr0,SphagnumripariumÅngstr0,Warnstorfiaexannulata(Schimp0)
Loeske,Warnstorfiafluitans(Hedw0)Loeske,Warnstorfiatrichophylla(Warnst0)Tuom0&T
0J0
Kop0
Stoneworts:CharaasperaDethardingexWilldenow,CharacontrariaA0BraunexKützing,
CharadelicatulaAgardh,CharafiliformisHertzach,CharaglobularisJ0L0Thuiller,Charahispida
L0,CharaintermediaA0Braun,CharapolyacanthaA0BrauninBraun,RabenhorstundStizen-
berger,ChararudisA0BrauninLeonhardi,CharatomentosaL0,Nitellaflexilis(L0)Agardh,
Nitellagracilis(Smith)Agardh,Nitellamucronata(A0Braun)Miquel,Nitellaopaca(Bruzelius)
Agardh,Nitellasyncarpa(Thuillier)Chevallier,Nitellatenuissima(Desvaux)Kützing,Nitel-
lopsisobtusa(DesvauxinLoiseleur-Deslongchamps)J0Groves0
Speciesabundance(biomassanddominanceindex),justlikethefrequen-
cyofvascularplants,mossesandstoneworts,wasvaried(Table4andTable
5)0Plantbiomassinthesampleswasgenerallylow(805±1405gd0w0/001m2,
Me=207),but,whichwasjustassignificant,thevariationrangeofthisfeature
wasverybroad(000003–19606gd0w0/001m2)0Itisworthmentioningthatthe
biomassofunderwaterplantsinthesamples(802±1403gd0w0/001m2,Me=205)
wassimilartothatofemergentplants(703±1203gd0w0/001m2;Me=205)0
Stonewortshadthehighestbiomassinthesamples(1004±1909gd0w0/001m2;
Me=104),especiallyCharahispida(2502±3606gd0w0/001m2),C.rudis(1700±2804
gd0w0/001m2),C.aspera(1303±2102gd0w0/001m2),C.contraria(1209±1603g/001m2)
andC.tomentosa(1108±2008gd0w0/001m2)0Locally,Charafiliformis(4009±2709
gd0w0/001m2;Me=3407)couldalsoreachhighbiomasslevels,but,duetoits
rarity,theproportionofthisspeciesinthebiomassofunderwaterplantswas
negligible0
Thebiomassofvascularplantsamountedto500±800gd0w0/001m2(Me=106
gd0w0/001m2)andwasmorethantwiceaslowasthatofstoneworts0The
majorityofvascularplantshadlowbiomass,exceptforPotamogetonlucens
(709±1009gd0w0/001m2),P
.praelongus(606±602gd0w0/001m2),Isoëteslacustris
(702±906gd0w0/001m2),Littorellauniflora(601±609gd0w0/001m2)andStratiotes
aloides(503±602gd0w0/001m2;Table4)0
