Upper Midwest Environmental Sciences Center

Table 3. Frequency SAV by Strata
Vegetation Update Title Page
tree_ftree_f Tables

Table 3.   Percent frequency of occurrence and abundance index of submersed aquatic vegetation by year, study reach, and aquatic strata (n = number of sites, Frq = percent frequency of occurrence, SE = standard error, AI = abundance index). In 1998, sites were selected from depths less than or equal to 3 m.  After 1998, the criteria was changed to less than or equal to 2.5 m; therefore, any sites between 2.5 and 3 m were dropped from the 1998 analysis for comparison purposes. A dash (–) indicates stratum was not sampled.

Pool 4
Contiguous backwater,
upper
Contiguous backwater, lower
Isolated backwater
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 74 32.4 5.5 4.3 0.8 157 68.8 3.7 14.2 1.2 31 87.1 6.1 25.7 3.5
1999
 75 29.3 5.3 3.6 0.7 160 66.3 3.8 10.8 0.7 34 76.5 7.4 15.9 2.3
2000
 100 18.0 3.9 2.0 0.5 179 64.2 3.6 10.7 0.8 32 81.3 7.0 26.7 4.9
2001
 100 14.0 3.5 1.3 0.4 176 71.0 3.4 12.0 0.7 50 76.0 6.1 15.1 1.7
2002
 100 16.0 3.7 2.1 0.5 180 67.2 3.5 10.2 0.6 30 83.3 6.9 17.5 2.1
2003a
 92 13.0 3.5 1.8 0.5 165 66.7 3.7 16.2 1.3
–
–
–
–
–
2004
 102 8.8 2.8 0.9 0.3 181 63.5 3.6 11.3 0.8 32 68.8 8.3 15.1 3.0
2005
 90 14.4 3.7 2.2 0.6 108 81.5 3.8 25.2 2.1 20 50.0 11.5 10.6 2.5
2006
 90 11.1 3.3 3.6 1.5 110 85.5 3.4 21.1 1.5 11 81.8 12.2 23.3 5.7
2007 88 26.1 4.7 3.9 0.9 110 84.5 3.5 17.5 1.0 10 70.0 15.3 13.6 3.0
2008 90 34.4 5.0 6.4 1.2 110 90.9 2.8 21.9 1.2 20 90.0 6.9 18.2 1.8
2009 89 49.4 5.3 7.9 1.0 110 90.9 2.8 26.6 1.7 20 85.0 8.2 20.4 3.1
2010 90 53.3 5.3 7.9 0.9 109 91.7 2.6 23.4 1.4 19 84.2 8.6 15.7 2.2
2011 90 62.2 5.1 9.5 1.1 110 92.7 2.5 19.1 0.8 19 94.7 5.3 18.9 1.3
2012 90 31.1 4.9 4.4 0.9 110 83.6 3.5 20.0 1.3 20 85.0 8.2 15.6 1.9
2013 90 32.2 5.0 4.3 0.7 110 83.6 3.5 17.2 0.9 20 90.0 6.9 18.3 2.3
2014 89 34.8 5.1 4.7 0.7 109 89.0 3.0 18.7 1.3 19 94.7 5.3 19.5 2.9
aData were provided by the U.S. Fish and Wildlife Service and the Division of Fisheries, Minnesota Department of Natural Resources.

 

Pool 4
Lake Pepin,
upper
Lake Pepin,
lower
Main channel border, upper
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 57 21.1 5.4 2.3 0.7 29 6.9 4.8 1.0 0.7 9 0.0 0.0 0.0 0.0
1999
 65 16.9 4.7 2.3 0.7 35 8.6 4.8 1.6 0.9 12 16.7 11.2 1.1 0.8
2000
 75 14.7 4.1 1.3 0.4 75 46.7 5.8 6.4 0.9 30 3.3 3.3 0.2 0.2
2001
 75 5.3 2.6 0.4 0.2 75 41.3 5.7 5.9 0.9 30 3.3 3.3 0.4 0.4
2002
 75 8.0 3.2 0.7 0.3 75 25.3 5.1 4.0 0.8 30 3.3 3.3 0.6 0.6
2003a
–
–
–
–
–
–
–
–
–
–
 26 0.0 0.0 0.0 0.0
2004
 77 7.8 3.1 1.2 0.5 77 9.1 3.3 0.8 0.3 31 0.0 0.0 0.0 0.0
2005
 59 10.2 4.0 1.0 0.4 50 8.0 3.9 0.9 0.5 20 0.0 0.0 0.0 0.0
2006
 60 18.3 5.0 2.5 0.7 50 16.0 5.2 1.9 0.6 20 5.0 5.0 0.3 0.3
2007 60 15.0 4.6 1.6 0.5 50 26.0 6.3 3.2 0.9 20 15.0 8.2 1.6 1.0
2008
 60 23.3 5.5 2.7 0.7 50 20.0 5.7 2.8 0.9 20 15.0 8.2 1.7 1.0
2009 60 31.7 6.1 3.4 0.7 50 42.0 7.1 7.2 1.3 20 20.0 9.2 2.7 1.4
2010 60 36.7 6.3 4.1 0.8 50 72.0 6.4 13.8 1.5 20 20.0 9.2 2.5 1.2
2011 60 28.3 5.9 3.8 0.9 50 34.0 6.8 5.4 1.2 20 15.0 8.2 1.4 0.8
2012 60 6.7 3.2 0.8 0.4 50 28.0 6.4 3.6 1.0 20 10.0 6.9 0.7 0.5
2013 59 22.0 5.4 2.1 0.6 50 16.0 5.2 2.3 0.8 20 10.0 6.9 1.2 0.9
2014 60 18.3 5.0 1.6 0.5 50 28.0 6.4 4.4 1.1 20 5.0 5.0 0.5 0.5
aData were provided by the U.S. Fish and Wildlife Service and the Division of Fisheries, Minnesota Department of Natural Resources.

 

Pool 4
Main channel border,
lower
Secondary channel,
upper
Secondary channel,
lower
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 37 10.8 5.2 1.8 0.9 47 4.3 3.0 0.3 0.2 65 35.4 6.0 6.8 1.4
1999
 48 20.8 5.9 2.4 0.8 61 0.0 0.0 0.0 0.0 59 37.3 6.3 5.2 1.0
2000
 40 22.5 6.7 2.4 0.8 40 0.0 0.0 0.0 0.0 60 45.0 6.5 7.2 1.2
2001
 40 22.5 6.7 4.9 1.5 40 0.0 0.0 0.0 0.0 60 31.7 6.1 5.2 1.1
2002
 40 20.0 6.4 2.8 1.0 40 5.0 3.5 0.5 0.4 60 25.0 5.6 3.7 0.9
2003a
 23 26.1 9.4 7.3 3.0 39 0.0 0.0 0.0 0.0 53 32.1 6.5 6.3 1.5
2004
 41 14.6 5.6 1.9 0.8 41 0.0 0.0 0.0 0.0 61 34.4 6.1 5.4 1.0
2005
 30 10.0 5.6 2.0 1.3 30 0.0 0.0 0.0 0.0 39 38.5 7.9 9.0 2.2
2006
 30 10.0 5.6 1.6 1.0 30 3.3 3.3 0.2 0.2 40 55.0 8.0 9.6 1.6
2007 30 43.3 9.2 6.2 1.4 30 10.0 5.6 1.0 0.6 40 55.0 8.0 9.9 1.6
2008
 30 36.7 8.9 6.3 1.8 30 13.3 6.3 1.3 0.7 40 60.0 7.8 11.6 1.7
2009 30 46.7 9.3 8.7 2.4 30 10.0 5.6 1.3 0.8 40 72.5 7.1 17.2 2.6
2010 30 46.7 9.3 12.6 3.0 30 6.7 4.6 1.0 0.7 40 55.0 8.0 10.1 1.8
2011 30 16.7 6.9 2.0 0.9 30 3.3 3.3 0.4 0.4 40 40.0 7.8 7.0 1.5
2012 30 23.3 7.9 6.4 2.8 30 3.3 3.3 0.5 0.5 40 47.5 8.0 8.3 1.6
2013 30 26.7 8.2 5.3 1.7 30 13.3 6.3 0.9 0.4 40 37.5 7.8 6.8 1.5
2014 30 23.3 7.9 2.9 1.1 30 6.7 4.6 0.6 0.4 40 35.0 7.6 5.1 1.5
aData were provided by the U.S. Fish and Wildlife Service and the Division of Fisheries, Minnesota Department of Natural Resources.

 

Pool 8
Contiguous backwater
Isolated backwater
Impounded
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 172 82.0 2.9 19.6 1.3 28 96.4 3.6 25.5 3.1 170 33.5 3.6 5.2 0.7
1999
 172 92.4 2.0 19.7 1.0 28 92.9 5.0 19.8 2.3 225 44.9 3.3 6.6 0.6
2000
 175 74.9 3.3 14.4 0.9 30 93.3 4.6 23.2 3.2 225 34.7 3.2 5.3 0.5
2001
 175 76.0 3.2 12.6 0.7 50 92.0 3.9 21.8 1.9 225 36.9 3.2 5.8 0.6
2002
 174 76.4 3.2 14.8 0.8 26 88.5 6.4 23.6 3.4 224 47.3 3.3 9.3 0.8
2003
 174 78.2 3.1 13.2 0.7 30 86.7 6.3 16.5 1.4 225 50.7 3.3 9.6 0.7
2004
 175 80.0 3.0 17.0 1.0 29 86.2 6.5 16.1 1.8 225 56.0 3.3 11.0 0.8
2005
 110 84.5 3.5 20.4 1.1 20 90.0 6.9 22.9 2.5 185 75.7 3.2 18.1 1.0
2006
 108 88.9 3.0 21.0 1.1 16 87.5 8.5 20.9 3.5 185 71.4 3.3 17.5 1.0
2007
 108 82.4 3.7 19.8 1.6 20 85.0 8.2 20.3 2.9 185 74.6 3.2 18.7 1.0
2008
 110 90.0 2.9 17.1 0.8 17 82.4 9.5 14.2 1.9 185 74.1 3.2 14.3 0.7
2009 110 88.2 3.1 20.0 1.2 18 61.1 11.8 15.8 4.2 184 89.1 2.3 18.5 0.8
2010 108 90.7 2.8 20.1 1.1 19 78.9 9.6 15.6 3.9 182 96.7 1.3 32.8 1.1
2011 110 86.4 3.3 17.4 0.8 19 78.9 9.6 16.9 3.3 183 86.3 2.5 16.0 0.6
2012 110 80.9 3.8 17.7 1.1 20 70.0 10.5 15.1 2.7 185 83.8 2.7 24.0 1.2
2013 110 72.7 4.3 14.6 1.3 20 90.0 6.9 24.8 4.2 185 80.5 2.9 16.7 0.7
2014 110 80.9 3.8 15.1 0.8 20 90.0 6.9 17.5 1.5 185 83.2 2.8 15.6 0.6

 

Pool 8
Main channel border
Secondary channel
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 53 18.9 5.4 3.1 1.0 93 35.5 5.0 7.1 1.3
1999
 70 25.7 5.3 3.8 0.9 100 36.0 4.8 5.2 0.8
2000
 99 30.3 4.6 3.7 0.6 120 32.5 4.3 4.5 0.6
2001
 100 24.0 4.3 3.5 0.8 120 22.5 3.8 3.1 0.6
2002
 100 17.0 3.8 2.9 0.7 120 29.2 4.2 4.5 0.7
2003
 100 15.0 3.6 2.7 0.7 120 28.3 4.1 4.8 0.8
2004
 100 21.0 4.1 3.4 0.7 120 30.0 4.2 4.3 0.7
2005
 70 24.3 5.2 4.4 1.1 65 32.3 5.8 6.2 1.2
2006
 70 20.0 4.8 4.1 1.1 65 46.2 6.2 7.9 1.4
2007
 70 18.6 4.7 3.5 0.9 65 43.1 6.2 8.2 1.5
2008
 70 41.4 5.9 6.3 1.0 65 53.8 6.2 8.4 1.1
2009 70 32.9 5.7 4.9 1.0 65 52.3 6.2 9.8 1.5
2010 70 48.6 6.0 11.0 1.7 65 69.2 5.8 17.3 2.0
2011 70 25.7 5.3 4.7 1.0 65 43.1 6.2 7.6 1.1
2012 70 25.7 5.3 5.7 1.2 65 32.3 5.8 6.6 1.3
2013 70 18.6 4.7 3.6 0.9 65 36.9 6.0 6.0 1.0
2014 69 26.1 5.3 4.6 1.0 65 30.8 5.8 4.8 1.0

 

Pool 13
Contiguous backwater
Isolated backwater
Impounded
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 169 52.7 3.9 9.0 0.8 27 70.4 9.0 15.1 2.4 209 42.6 3.4 8.2 0.8
1999
 170 51.8 3.8 9.0 0.8 29 58.6 9.3 18.7 4.5 210 42.4 3.4 8.0 0.8
2000
 198 58.1 3.5 11.0 0.9 27 59.3 9.6 12.9 2.5 210 40.5 3.4 8.1 0.7
2001
 198 55.6 3.5 12.2 1.1 52 61.5 6.8 12.4 1.9 209 38.3 3.4 9.4 1.0
2002
 200 51.5 3.5 12.0 1.1 29 69.0 8.7 12.0 1.7 209 44.5 3.4 12.7 1.2
2003
 200 56.0 3.5 13.3 1.0 29 55.2 9.4 20.2 4.8 210 36.7 3.3 8.6 0.8
2004
 219 61.2 3.3 12.5 0.9 31 54.8 9.1 12.2 3.3 236 46.2 3.3 11.0 1.0
2005
 118 68.6 4.3 16.0 1.4 24 75.0 9.0 23.5 3.8 175 59.4 3.7 14.8 1.2
2006
 119 66.4 4.3 14.1 1.2 23 73.9 9.4 16.4 2.2 175 69.7 3.5 14.8 0.9
2007
 118 68.6 4.3 16.9 1.5 22 36.4 10.5 7.9 2.6 172 67.4 3.6 18.6 1.3
2008
 115 80.9 3.7 14.2 0.9 23 60.9 10.4 11.2 2.3 175 61.1 3.7 11.2 0.8
2009 119 73.1 4.1 17.9 1.4 24 91.7 5.8 25.7 4.0 175 67.4 3.6 17.6 1.3
2010 120 75.0 4.0 17.6 1.3 23 87.0 7.2 23.4 4.1 175 64.6 3.6 16.7 1.1
2011 120 65.0 4.4 13.4 1.2 25 80.0 8.2 16.4 1.8 175 61.7 3.7 13.4 0.9
2012 120 58.3 4.5 14.9 1.6 23 73.9 9.4 20.7 4.1 175 61.7 3.7 19.7 1.6
2013 120 60.8 4.5 10.2 1.0 25 68.0 9.5 21.7 5.6 175 60.6 3.7 15.1 1.2
2014 120 56.7 4.5 10.0 0.9 24 58.3 10.3 13.5 3.4 175 60.0 3.7 13.8 1.1

 

Pool 13
Main channel border
Secondary channel
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 62 8.1 3.5 0.9 0.4 62 14.5 4.5 1.7 0.6
1999
 70 11.4 3.8 1.7 0.6 70 10.0 3.6 1.1 0.4
2000
 70 14.3 4.2 2.3 0.8 70 4.3 2.4 0.3 0.2
2001
 70 10.0 3.6 1.9 0.8 70 14.3 4.2 1.5 0.5
2002
 70 7.1 3.1 1.0 0.5 70 10.0 3.6 1.1 0.4
2003
 70 7.1 3.1 1.4 0.7 70 11.4 3.8 1.4 0.5
2004
 79 12.7 3.8 1.3 0.4 79 10.1 3.4 1.3 0.5
2005
 80 12.5 3.7 2.5 0.8 50 14.0 5.0 1.7 0.6
2006
 80 20.0 4.5 3.0 0.7 50 18.0 5.5 3.2 1.3
2007
 80 23.8 4.8 4.7 1.0 50 24.0 6.1 5.3 1.7
2008
 80 12.5 3.7 1.5 0.5 50 18.0 5.5 2.4 0.8
2009 77 19.5 4.5 4.2 1.2 48 14.6 5.1 2.3 0.8
2010 80 20.0 4.5 3.9 1.0 50 18.0 5.5 3.1 1.0
2011 80 16.3 4.2 3.3 0.9 50 20.0 5.7 3.1 0.9
2012 80 21.3 4.6 6.6 1.7 50 14.0 5.0 1.9 0.7
2013 79 5.1 2.5 0.8 0.4 48 8.3 4.0 1.0 0.5
2014 80 7.5 3.0 2.4 1.2 50 6.0 3.4 0.9 0.5

 

Pool 26
Contiguous backwater
Isolated backwater,
Illinois River
Isolated backwater, Mississippi River
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 50 2.0 2.0 0.1 0.1 160 16.9 3.0 4.7 0.9 30 3.3 3.3 0.5 0.5
1999
 80 0.0 0.0 0.0 0.0 160 1.3 0.9 0.1 0.1 50 0.0 0.0 0.0 0.0
2000
 79 0.0 0.0 0.0 0.0 95 14.7 3.7 3.5 1.0 42 2.4 2.4 0.2 0.2
2001
 80 0.0 0.0 0.0 0.0 94 6.4 2.5 0.8 0.3 60 0.0 0.0 0.0 0.0
2002
 80 0.0 0.0 0.0 0.0 100 6.0 2.4 1.0 0.4 57 1.8 1.8 0.1 0.1
2003a
 80 0.0 0.0 0.0 0.0 100 25.0 4.4 8.8 2.0 60 0.0 0.0 0.0 0.0
2004
 110 0.0 0.0 0.0 0.0 132 1.5 1.1 0.2 0.2 58 0.0 0.0 0.0 0.0
aData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

 

Pool 26
Impounded
Main channel border,
Illinois River
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 27 0.0 0.0 0.0 0.0 47 0.0 0.0 0.0 0.0
1999
 80 1.3 1.3 0.1 0.1 50 2.0 2.0 0.1 0.1
2000
 39 0.0 0.0 0.0 0.0 40 0.0 0.0 0.0 0.0
2001
 40 0.0 0.0 0.0 0.0 40 0.0 0.0 0.0 0.0
2002
 40 0.0 0.0 0.0 0.0 40 0.0 0.0 0.0 0.0
2003a
 40 0.0 0.0 0.0 0.0 40 0.0 0.0 0.0 0.0
2004
 56 0.0 0.0 0.0 0.0 56 0.0 0.0 0.0 0.0
aData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

 

Pool 26
Main channel border,
Mississippi River
Secondary channel
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 121 0.0 0.0 0.0 0.0 84 0.0 0.0 0.0 0.0
1999
 137 0.0 0.0 0.0 0.0 90 0.0 0.0 0.0 0.0
2000
 47 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2001
 49 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2002
 50 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2003a
 50 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2004
 69 0.0 0.0 0.0 0.0 69 0.0 0.0 0.0 0.0
aData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

 

La Grange Pool
Contiguous backwater
Isolated backwater
Lakesa
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 173 0.0 0.0 0.0 0.0 179 0.0 0.0 0.0 0.0
–
–
–
–
–
1999
 190 0.0 0.0 0.0 0.0 188 0.0 0.0 0.0 0.0
–
–
–
–
–
2000
 100 0.0 0.0 0.0 0.0 138 0.0 0.0 0.0 0.0 57 80.7 5.3 26.8 3.4
2001
 100 0.0 0.0 0.0 0.0 129 0.0 0.0 0.0 0.0 57 77.2 5.6 21.9 2.8
2002
 100 0.0 0.0 0.0 0.0 139 0.0 0.0 0.0 0.0 59 79.7 5.3 21.5 2.7
2003b
 100 0.0 0.0 0.0 0.0 117 0.0 0.0 0.0 0.0 60 93.3 3.2 45.2 3.5
2004
 128 0.0 0.0 0.0 0.0 175 0.0 0.0 0.0 0.0 74 71.6 5.3 25.2 2.9
aThe lakes stratum was added to sampling in 2000.
bData were provided by the Illinois Natural History Survey based on a grant from the Illinois Department of Natural Resources.

 

La Grange Pool
Main channel border
Secondary channel
Year
n
Frq
±SE
AI
±SE
n
Frq
±SE
AI
±SE
1998
 83 0.0 0.0 0.0 0.0 29 0.0 0.0 0.0 0.0
1999
 120 0.0 0.0 0.0 0.0 40 0.0 0.0 0.0 0.0
2000
 80 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2001
 78 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2002
 80 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2003a
 80 0.0 0.0 0.0 0.0 50 0.0 0.0 0.0 0.0
2004
 103 0.0 0.0 0.0 0.0 65 0.0 0.0 0.0 0.0
aData were provided by the Illinois Natural History Survey based on a grant from the Illinois Department of Natural Resources.


Content manager: Danelle Larson


Page Last Modified: April 17, 2018