Gillis (Putnam County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 29°34'3", Longitude 81°59'5"

Period of record: 110 sampling dates; May 2, 1990 to November 1, 1999

Surface area (LAKEWATCH): 58 acres / 23 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Trail Ridge

Geologic formation (Brooks 1981):

The geology is dominated by quartz sand and quartzite gravel with sandy clay beds of the Hawthorne Formation.

Physiographic region (Brooks 1981):

The water body lies in the St. John’s Offset division of the Central Lake District.
 
 

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 3 months sampled:
 
pH
4.8
 Sulfate (mg/L)
7.3
Total alkalinity (mg/L as CaCO3)
0.0
 Calcium (mg/L)
1.5
Conductance (µS/cm @ 25 °C)
64
 Magnesium (mg/L)
1.1
Color (Pt-Co units)
8
 Sodium (mg/L)
6.5
Chloride (mg/L)
11.7
 Potassium (mg/L)
0.4
Silicon (mg/L)
0.3
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 110 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
4
9
17
Long-term total nitrogen concentrations (µg/L)
140
410
1260
Long-term total chlorophyll concentrations (µg/L)
1.0
5.8
46.3
Long-term Secchi depth (ft)
1.8
7.2
15.0

1999 Florida LAKEWATCH Data

Numbers reported below are monthly averages calculated from 3 stations for total phosphorus (TP, µg/L), total nitrogen (TN, µg/L), chlorophyll (CHL, µg/L) and Secchi depth (SECCHI, ft) during 1999:

Date
TP (µg/L)
TN (µg/L)
CHL (µg/L)
SECCHI (ft
Jan-08-99
9
760
4.0
4.3
Feb-03-99
9
810
7.3
4.5
Mar-02-99
9
770
7.0
4.2
Apr-05-99
13
800
2.0
5.3
May-03-99
11
860
6.7
4.5
Jul-09-99
8
390
.
8.3
Aug-02-99
10
380
6.3
6.0
Sep-04-99
10
380
5.3
6.8
Oct-07-99
10
380
7.3
6.0
Nov-01-99
10
380
2.7
6.5
         
1999 Average
10
590
5.4
5.7

Gillis (Putnam County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 11, 1991

Percent area covered with aquatic vegetation (PAC, %)
10
Percent of lake's volume filled with vegetation (PVI, %)
1
Average emergent plant biomass (kg wet wt/m2)
5.8
Average floating-leaved plant biomass (kg wet wt/m2)
2.6
Average submersed plant biomass (kg wet wt/m2)
3.9
Average width of emergent and floating-leaved zone (ft.)
26
Average lake depth (m)
3

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
maidencane Panicum hemitomon
100
spatterdock Nuphar luteum
90
slender spikerush Eleocharis baldwinii
80
buttonbush Cephalanthus occidentalis
80
sawgrass Cladium jamaicense
80
red ludwigia Ludwigia repens
40
banana-lily Nymphoides aquatica
20
pickerelweed Pontederia cordata
20
southern cutgrass Leersia hexandra
20
St. John's wort Hypericum spp.
20
water-pennywort Hydrocotyle umbellata
10
water-moss Fontinalis spp.
10
cone-spur bladderwort Utricularia gibba
10
water primrose Ludwigia octovalvis
10
red root Lachnanthes caroliniana
10
respuinata bladderwort Utricularia resupinata
10

Gillis (Putnam County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on August 3, 1993

Percent area covered with aquatic vegetation (PAC, %)
16
Percent of lake's volume filled with vegetation (PVI, %)
1
Average emergent plant biomass (kg wet wt/m2)
4.1
Average floating-leaved plant biomass (kg wet wt/m2)
2.3
Average submersed plant biomass (kg wet wt/m2)
1.7
Average width of emergent and floating-leaved zone (ft.)
27
Average lake depth (m)
2

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
slender spikerush Eleocharis baldwinii
100
spatterdock Nuphar luteum
100
buttonbush Cephalanthus occidentalis
100
maidencane Panicum hemitomon
100
red ludwigia Ludwigia repens
90
wax myrtle Myrica cerifera
70
sawgrass Cladium jamaicense
70
St. John's wort Hypericum spp.
70
pickerelweed Pontederia cordata
40
willow Salix spp.
30
southern cutgrass Leersia hexandra
30
red root Lachnanthes caroliniana
30
rush fuirena Fuirena scirpoidea
20
duck-potato Sagittaria lancifolia
10
banana-lily Nymphoides aquatica
10
cat-tail Typha spp.
10
water-pennywort Hydrocotyle umbellata
10
water-moss Fontinalis spp.
10
para grass Brachiaria mutica
10
yellow-eyed grass Xyris spp.
10

Gillis (Putnam County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 29, 1998

Percent area covered with aquatic vegetation (PAC, %)
14
Percent of lake's volume filled with vegetation (PVI, %)
3
Average emergent plant biomass (kg wet wt/m2)
19.1
Average floating-leaved plant biomass (kg wet wt/m2)
3.1
Average submersed plant biomass (kg wet wt/m2)
0.0
Average width of emergent and floating-leaved zone (ft.)
30
Average lake depth (m)
5

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
pickerelweed Pontederia cordata
100
sawgrass Cladium jamaicense
100
maidencane Panicum hemitomon
100
southern cutgrass Leersia hexandra
90
buttonbush Cephalanthus occidentalis
80
banana-lily Nymphoides aquatica
70
water tupelo Nyssa aquatica
60
red maple Acer rubrum
60
slender spikerush Eleocharis baldwinii
50
Florida bladderwort Utricularia floridana
40
St. John's wort Hypericum spp.
40
spatterdock Nuphar luteum
30
wax myrtle Myrica cerifera
30
red ludwigia Ludwigia repens
20
smartweed Polygonum hydropiperoides
20
sweetbay Magnolia virginiana
20
duck-potato Sagittaria lancifolia
10
red bay Persea borbonia
10

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