Lake Hortonia 2008 - Eagle Lake Property Owner's Inc.

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Species Name Common Name Burr Pond Lake Hortonia Lake Wetland Lake Wetland Nymphaea odorata Ait. white waterlily X X X X Polygonum sp. smartweed X X Pontederia cordata L. pickerelweed X X X X Potamogeton amplifolius Tuckerm. largeleaf pondweed X X Potamogeton crispus L. curlyleaf pondweed X X Potamogeton epihydrus Raf. ribbon-leaf pondweed X X X Potamogeton gramineus L. variable-leaf pondweed X X Potamogeton illinoensis Morong. Illinois pondweed X X X X Potamogeton natans L. floating-leaf pondweed X X Potamogeton (Stukenia) pectinatus L. sago pondweed X Potamogeton praelongus Wulfen white-stem pondweed X Potamogeton pusillus L. small pondweed X X X Potamogeton robbinsii Oakes Robbins’ pondweed X X Potamogeton zosteriformis Fern. flat-stem pondweed X X X Ranunculus longirostris Godron white watercrowfoot X X Scirpus sp. bulrush X X X Sparganium sp. burreed X X X Sphagnum sp. sphagnum X X Typha sp. cattail X X X X Utricularia gibba L. humped bladderwort X X X Utricularia minor L. small bladderwort X X X Utricularia vulgaris L. great bladderwort X X X X Vallisneria americana L. wild celery X X X X 6
Maximum Depth of Colonization Maximum depth of rooted aquatic plant growth was similar for the two lakes, with the littoral zone extending to a maximum depth of 4 m. Depth distribution of sampling points (Figure 3) and maximum depth of colonization by aquatic plants in Burr Pond was comparable to that reported for earlier studies (Getsinger et al. 2002). A bladderwort, Utricularia gibba, was reported for a single sample in a depth of 4.5 m in 2003. This weakly rooted species may have drifted to this location and may not be able to survive. Specimens of Chara sp. were observed in a single sample from 4.7 m depth in Burr Pond in 2004 thru 2007. Numerous dead stems of Chara sp. were collected in water depths of 4.0 to 4.5 m. These results suggest the presence of an anaerobic hypolimnion in Burr Pond during summer stratification, after plant propagules have produced mature plants. Chara sp. was able to survive and grow in hypolimnetic depths during the Spring and early Summer, prior to anaerobic conditions developing. As the period of summer stratification progresses, anaerobic conditions generally move higher in the water column, resulting in the death of the Chara sp. growing there. Figure 3. Depth Distribution of Burr Pond Sampling Points in 1 meter depth classes. Percentage of Points 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Individual Cumulative 1 2 3 4 5 Depth (m) Species Lists Maps of the distribution of aquatic plant species and groups of species (i.e. Broad-leaf Pondweeds) for Burr Pond are included in Appendix A, Figures A1 – A10. Charophytes were the most abundant native species, present in 44% of all samples collected. Myriophyllum spicatum was the most abundant aquatic plant species occurring in Burr Pond, reported in 55% of samples collected. Common native species for Burr Pond included Utricularia gibba (32%), Vallisneria americana (28%), Potamogeton illinoensis (26%), Najas flexilis (19%), Elodea canadensis (19%), Potamogeton gramineus (9%), Nuphar advena (9%), Potamogeton pusillus (8%), and Nymphaea odorata (8%). 7
Page 1 and 2: Aquatic Vegetation of Burr Pond and
Page 3 and 4: List of Tables Table 1 Species list
Page 5 and 6: Background. Quantitative aquatic pl
Page 7 and 8: collected as reference specimens fo
Page 9: Results and Discussion Burr Pond Op
Page 13 and 14: (
Page 15 and 16: declined rapidly between 1999 (69%)
Page 17 and 18: Frequency of occurrence of Eurasian
Page 19 and 20: Lake Hortonia Open-Lake Survey Resu
Page 21 and 22: Species Name Table 5. Lake Hortonia
Page 23 and 24: declined rapidly between 1999 (54%)
Page 25 and 26: Number of Species 8 6 4 2 0 1999 20
Page 27 and 28: Species August Surveys 1999 2000 20
Page 29 and 30: Summary Quantitative aquatic plant
Page 31 and 32: In September of 2008, the aquatic p
Page 33 and 34: Figure 14. Distribution of Eurasian
Page 35 and 36: Appendix A Burr Pond Aquatic Plant
Page 37 and 38: BlIrr Burr Pond 2008 Disf,.ibllfiol
Page 39 and 40: Burr Pond 2008 Disfl'iblltioll D,:"
Page 41 and 42: Burr Pond 2008 Disfl'ibllfioll Disf
Page 43 and 44: BlIrr Burr Pond 2008 Disf,.ibllfiol
Page 45 and 46: BII,.,. POlld Pond 2008 D,:
Page 47 and 48: Appendix A. Burr Pond Plant Distrib
Page 49 and 50: Lake Hortonia 2008 Distributioll 0/
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Lake Hortonia 2008 DisfributioTl Di
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