Tomahawk (Marion County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 29°7'57", Longitude 81°54'23"
Period of record: 21 sampling dates; May 3, 1990 to October 29, 1995
Surface area (Shafer et al. 1986): 39 acres / 16 hectacres
Lake Region (Griffith et al. 1997): Ocala Scrub
Geologic formation (Brooks 1981):
The geology is dominated by undifferentiated sand, shell, clay, marl, and peat of the Holocene.
Physiographic region (Brooks 1981):
The water body lies in the Central Lakes division of the Central Lake District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 5 months sampled:
|
pH |
4.8 |
Sulfate (mg/L) |
6.6 |
|
Total alkalinity (mg/L as CaCO3) |
0.8 |
Calcium (mg/L) |
0.8 |
|
Conductance (µS/cm @ 25 °C) |
39 |
Magnesium (mg/L) |
0.7 |
|
Color (Pt-Co units) |
2 |
Sodium (mg/L) |
3.8 |
|
Chloride (mg/L) |
6.7 |
Potassium (mg/L) |
0.2 |
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 21 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
3 |
7 |
12 |
|
Long-term total nitrogen concentrations (µg/L) |
40 |
180 |
390 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.3 |
5.0 |
23.0 |
|
Long-term Secchi depth (ft) |
3.0 |
7.4 |
10.2 |
Florida LAKEWATCH data were not collected in 1999.
Tomahawk (Marion County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on July 29, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
30 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
5 |
|
Average emergent plant biomass (kg wet wt/m2) |
2.4 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.2 |
|
Average submersed plant biomass (kg wet wt/m2) |
0.2 |
|
Average width of emergent and floating-leaved zone (ft.) |
9 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
water-pennywort |
Hydrocotyle umbellata |
100 |
|
southern cutgrass |
Leersia hexandra |
100 |
|
yellow-eyed grass |
Xyris spp. |
100 |
|
slender spikerush |
Eleocharis baldwinii |
90 |
|
bog button |
Lachnocaulon spp. |
80 |
|
maidencane |
Panicum hemitomon |
70 |
|
spatterdock |
Nuphar luteum |
60 |
|
bacopa |
Bacopa monnieri |
50 |
|
Tracy's beak-rush |
Rhynchospora tracyi |
50 |
|
banana-lily |
Nymphoides aquatica |
30 |
|
red root |
Lachnanthes caroliniana |
30 |
|
St. John's wort |
Hypericum spp. |
20 |
|
rush spp. |
Juncus dichotomus |
20 |
|
jointed flat sedge |
Cyperus haspan |
20 |
|
lemon bacopa |
Bacopa caroliniana |
10 |