The Aquatic Macrophyte Community Index (AMCI) was used to define the quality of the aquatic plant community based on seven parameters: the maximum rooting depth, the percentage of the littoral zone vegetated, the relative frequencies of submerged species, sensitive species and exotic species, Simpson’s Diversity Index and the total number of taxa. Each parameter was scaled from with 10 representing the most desirable condition. The scaled values were then summed to obtain the AMCI (Nichols et al., 2000). The AMCI and FQI of Bass Lake were compared to those of all Wisconsin Lakes and Lake in the North Central Hardwood Forest region. Simpson’s Diversity Index (SDI) was used to measure the diversity of the plant communities in each survey. The formula measures the probability that two individuals from the same community will be the same species. Values for SDI range from 0-1 where a value of 0 indicates two individuals will always be the same species and a value of 1 indicates two individuals will always be different species. SDI = 1 - (Sum (frequency of occurrence of one species/sum frequency of all species)) Chi-square analysis was used to determine significant differences between consecutive surveys in the frequency of occurrence of each species. Figure 1. Map – Sampling grid
Potamogeton 2009 Stuckenia richardsonii pectinata Potamogeton 5% 4% illinoensis 6% Nymphaea odorata Other (20spp) 6% 21% Heteranthera Potamogeton dubia Chara sp. zosteriformis 9% 12% Najas 21% flexilis 16% Potamogeton 2013 Schoenoplectus richardsonii tabernaemonta Nymphaea 5% ni odorata 4% 6% Heteranthera dubia Other (19 spp) 6% 21% Potamogeton Chara sp. illinoensis 17% 10% Potamogeton Najas flexilis zosteriformis 16% 15% Ceratophyllum 2014 demersum 6% Potamogeton richardsonii 7% Chara sp. 11% Potamogeton illinoensis 12% sibiricum 5% Other (15 spp) 19% Potamogeton zosteriformis 22% Najas flexilis 18% Myriophyllum 2015 Vallisneria sibiricum americana Potamogeton 5% 4% richardsonii Other (14 spp) 6% 11% Ceratophyllum Potamogeton demersum zosteriformis 7% 22% Potamogeton illinoensis 9% Najas flexilis 19% Chara sp. 17% Figure 10. Dominance values of aquatic plant community 11
VF.gP.tA F.d itP. i:; Littor .I zone site - no vege!tion Site beyono maximum depth of plants ..... . • •· e• • • •I -- • • • • !!I!!l ·..:.:..:1,1,_ 1 ···:.::..::.:.·:.; .. n
HOl C fUl nc:33 1 • R l-<P. f111 :--; ? Ral<.t! ful11t:r:>s 3 ,1..... .... ' Bidens beckii Water marigold 1: "s :.:...... .· \ ........
+ Rake fullness 1 Ral<e ruune 2 r Kc 1urrncs3 3 Ceratophyllum demersum Coontail 7: f.0.:: .1.:.:. .... .?..:... J • • • : :.............. · .=..=.··=.....=.1. .:..:..:...p :::9: :...........9....).. ).
+ Rake fullness 1 Ral<e 2 r Kc 1urrncs3 3 echinatum Spiny hornwort m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... ................. \·...
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: Common waterweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... ................. l
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: Eleocharis pa/ustris Creeping spikerush R: .. .. .· ..:.. .. I/ . 1 :: .:..:.:..)...p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: Small duckweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: ::::: }:..-:u.:...., )I:• :• :• :• :• :• :T.: • •...•.•.•.•• · •.•.•.•. • •.•.•.•.. Najas flexillis Slender naiad ...:.:..::.:....s. •.•..•..•..•..•.•.
RaKe IUllnE> 1 l<C tUll OCSJ a R;:ikt: fullnf:: Spatterdock m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... ................. r
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: aru,dinacea Reed canary grass m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... ................. i
.. RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: amplifolius pondweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:...p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l<C tUll OCSJ a R;:ikt: fullnf:: crispus ..... :.... .· ..:.. .. I/ . 1 :: .:..:.:..)...p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: gramineus Variable pondweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
+ Rake fullness 1 Ral<e ruune 2 r Kc 1urrncs3 3 illinoensis Illinois pondweed 1· fI.:........ \· ;.··: :::::::..7:. .•.•., !.. :-:;fp ..... •.•.•.•.•.....
+ Rake fullness 1 Ral<e ruune 2 Kc 1urrncs3 3 natans Floating-leaf pondweed m1· ..... :.... .. .· :::). .. ......... :::::::::::::)1 ........
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: natans ..... :.... .· ..:.. .. I/ . 1 :: .:..:.:..)...p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUllOCSJ a R;:ikt: fullnf:: praelongis White-stem pondweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:....p ::::::9::::::)1 .. .... .................
+ Rake fullness 1 Ral<e ruune 2 r Kc 1urrncs3 3 pusillis Small pondweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:...p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: robinsii Fern pondweed m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: Potamogeton zosteriformis pondweed 2013 (&r·I.· ,,: : ....'"(_._,--... 1• •·•.•.•.•••••.. .... .........: · .......=..=..=..=.1. ). ·:::::::::::::;)1 ........ :• ••:•:• • ..:..:.r
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: crowfoot ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
+ Rake fullness 1 Ral<e ruune 2 r Kc 1urrncs3 3 graminea Grass-leaved arrowhead m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... ................
+ Rake fullness 1 Ral<e 2 r Kc 1urrncs3 3 latifolia Common arrowhead m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
RaKe IUllnE> 1 l l<C tUll OCSJ a R;:ikt: fullnf:: angustifolia Narrow-leaved cattail R: .. .. .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
+ Rake fullness 1 Ral<e ruune 2 r Kc 1urrncs3 3 sp Catta il 1· m..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................
+ Rake fullness 1 Ral<e ruune 2 r Kc 1urrncs3 3 vulgaris Common bladderwort m1· ..... :.... .· ..:.. .. I/ . 1 :: .:..:..:.....p :::::::::::::)1 .. .... .................