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Tnclopyr for selective whole -bay milfoil management <br />160 <br />,�..� 140 <br />120 <br />N ` d � 100 <br />h r i . [ . <br />! � -flat • . s_w 79 1 <br />OD <br />60 <br />40 <br />egrJun,Z812 �rw , �i+0" ZO <br />wn spFumfulu <br />FFmqueny ONJMW p—ts �- t 0 <br />Nome 862% t93) 16o <br />! 143%(42) �. 140 <br />O Dena, 4. 1 <br />120 <br />•r.r <br />rrrr4� * ti 100 <br />• •r,0 �r � �r 40 <br />• �r` r <br />kw <br />•-w•••• •�, r! 160 <br />idems Bay � AU t 2 ,.• •irr <br />•-,r...rr <br />iophygm spieatrnn " s r .: 140 <br />F'Y A�lw� po■Ha .�� <br />rbM9 r ` sy <br />42-t% #283) - "' 120 <br />spares tas Me) 106 <br />! VQbWa* 206%ies1 � <br />. I'MOi 84 <br />Figure 5. Point -intercept grids on Gideons Bay in Lake Minnetonka, <br />MN, showing frequency of occurrence, spatial distribution, and rake <br />density ratings for Myriophyllum apkatum in June (top panel) and 44 <br />August 2012 (bottom panel). Contour lines represent 3 m <br />intervals. 20 <br />0 <br />St Albans n=30 <br />noted earlier, the reduction in dense EWM coverage follow- <br />Jun f 1 Aug i i Jun'12 Aug 12 Jun 1S Aug 13 <br />the triclopyr treatment in Grays Bay likely explained the <br />Monthing Sampled <br />43% reduction in biovolume• In contrast, the 21% reduction <br />Figure S. Submersed plant biomass for 3 bays on Lake <br />in biovolume observed between June and August 2012 in <br />Minnetonka, MN over a 3 -year period Bars represent the mean <br />St. Albans Bay was not readily explained. Overall, these by- <br />biomass (g dry wt) for 30 samples X95% Cl 5t. Albans Bay <br />droacoustic data were in general agreement with the trends <br />received whole -bay management in May 2011 and June 2013, <br />Greys in 2012, and Gideon in June 2011 <br />observed in total biomass data. Interestingly, both meth- <br />ods suggested total biomass changes between early June <br />and late August were generally modest in nature. Despite <br />used in combination with point -intercept data, the resource <br />highly favorable conditions for continued growth between <br />meager can obtain an improved assessment for overall im- <br />June and August, the data suggested the plants in the Mui- <br />pacts on biovolume as well as individual species impacts. <br />netonka Bays largely occupied their maximum space and <br />biomass early in the growing season. The hydroacoustic data <br />provided further evidence to refute claims of a large-scale <br />D[ ■ 5ClISSIE011 <br />depression in native plant abundance following large-scale <br />management with triclopyr at low use rates. Although the .. <br />The bay -wide treatments were monitored as part of a demon - <br />acoustic data do not allow for discriminating species, when <br />stration program that targeted EWM in selected bays. We <br />319 <br />