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3.VEGETATIONSTRUCTURE
3.1.Frequencyandspeciesabundance
Inthe161lakes,122waterplantspecieswerefound,including84submerged
ones,3floatingones(pleustophytes)and35emergentones,whichoccurred
veryrarely(frequency<2%)0ThemostcommonemergentspecieswasEle-
ocharispalustris(L0)Roem0&Schult0(279samples;108%)0EquisetumfluviatileL0
(97;006%),Phragmitesaustralis(Cav0)Trin0exSteud0(40;003%)andSparganium
angustifoliumF
0Michx0(39;003%)werecommon,whileAgrostiscaninaL0,Alis-
maplantago-aquaticaL0,CardaminepratensisL0,ComarumpalustreL0,Sparganium
emersumRehmann,IuncuseffususL0,I.filiformisL0,Eriophorumangustifolium
Honck0,Glyceriafluitans(L0)R0Br0andG.maxima(Hartm0)Holmb0wererare0
Vascularplantswerethemostnumerousgroupamongmacrophytes(Cor-
mophyta;47species)0Theyoccurredin5831samples,thatis,inmorethan
halfofthecollectedsamples(55%)0Myriophyllumalterniflorum(1537samples;
1405%)andIsoëteslacustris(1532;1404%)werethemostcommon,whereas
Elodeacanadensis(1049;909%),Lobeliadortmanna(898;805%)Myriophyllumspi-
catum(762;702%),Ceratophyllumdemersum(625;509%)andLittorellauniflora
(572;504%)weretheleastfrequentlyfound0Table2showsthelistofspecies,
theadoptedabbreviationsoftheirnamesandthefrequencyinthetotalofthe
plantsamplesandinthedepthzones0
Mosses(Bryophyta)werequiteanumerousspeciesgroupandencom-
passed3Hepaticopsida,13Bryalesand4Sphagnales0Mosseswerefoundin
4528samples(4207%)0Sphagnumdenticulatum(2157samples;2003%)wasthe
mostfrequent0Fontinalisantipyretica(1208%),Warnstorfiaexannulata(1101%),
Drepanocladussordidus(501%),Sphagnumcuspidatum(400%),Fontinalisdelecar-
lica(203%),Drepanocladusaduncus(202%),Sphagnumfallax(100%)andWarnstor-
fiafluitans(100%)werelessoftenobserved0Thefrequencyoftheremaining
mossesdidnotexceed1%(Table3)0
