Percent frequency of species by year (July/August sampling period) in a backwater near Stoddard, Wisconsin, Pool 8, Mississippi River.
|
1992 |
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000 |
|||
|
number of sites sampled |
47 |
46 |
47 |
47 |
48 |
51 |
50 |
50 |
50 |
||
|
all submersed vegetation |
68.1 |
78.3 |
93.6 |
97.9 |
89.6 |
98.0 |
84.0 |
92.0 |
78.0 |
||
|
coontail |
Ceratophyllum demersum |
66.0 |
73.9 |
87.2 |
91.5 |
85.4 |
90.2 |
84.0 |
86.0 |
70.0 |
|
|
Canadian waterweed |
Elodea canadensis |
- |
19.6 |
61.7 |
78.7 |
43.8 |
54.9 |
62.0 |
64.0 |
64.0 |
|
|
curly pondweed |
Potamogeton crispus |
2.1 |
23.9 |
21.3 |
6.4 |
20.8 |
51.0 |
6.0 |
16.0 |
44.0 |
|
|
leafy/small pondweed |
P. foliosus/P. pusillus |
- |
30.4 |
4.3 |
8.5 |
16.7 |
7.8 |
- |
- |
- |
|
|
sago pondweed |
P. pectinatus |
23.4 |
52.2 |
40.4 |
10.6 |
39.6 |
39.2 |
10.0 |
38.0 |
24.0 |
|
|
all rooted floating leaf vegetation |
46.8 |
39.1 |
36.2 |
38.3 |
45.8 |
27.5 |
16.0 |
8.0 |
- |
||
|
yellow pond-lily |
Nuphar variegata |
- |
- |
4.3 |
2.1 |
- |
- |
- |
- |
- |
|
|
white water-lily |
Nymphaea odorata |
46.8 |
39.1 |
31.9 |
36.2 |
45.8 |
27.5 |
16.0 |
8.0 |
- |
|
|
Total number of species recorded |
4 |
6 |
7 |
7 |
6 |
6 |
5 |
5 |
4 |
||