John's (Orange County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°31'35", Longitude 81°40'30"

Period of record: 83 sampling dates; October 29, 1989 to December 15, 1999

Surface area (LAKEWATCH): No data available.     Bathymetric Map

Lake Region (Griffith et al. 1997): Apopka Upland

Geologic formation (Brooks 1981):

The geology is dominated by deeply weathered beach and dune sand with some clay lenses of the preglacial Pleistocene.

Physiographic region (Brooks 1981):

The water body lies in the Gap subdivision of the Lake Wales Ridge 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Supplemental, unpublished water chemistry data, University of Florida.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
7.0
 Sulfate (mg/L)
39.8
Total alkalinity (mg/L as CaCO3)
19.4
 Calcium (mg/L)
7.5
Conductance (µS/cm @ 25 °C)
241
 Magnesium (mg/L)
11.0
Color (Pt-Co units)
76
 Sodium (mg/L)
16.3
Chloride (mg/L)
33.6
 Potassium (mg/L)
14.5
Silicon (mg/L)
1.6
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 83 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
13
39
66
Long-term total nitrogen concentrations (µg/L)
720
1050
1260
Long-term total chlorophyll concentrations (µg/L)
2.0
11.2
39.7
Long-term Secchi depth (ft)
2.8
4.3
6.8

1999 Florida LAKEWATCH Data

Numbers reported below are monthly averages calculated from 6 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
Mar-28-99
31
990
13.2
3.7
Apr-25-99
45
1260
20.7
3.3
Jul-24-99
40
1050
23.7
3.0
Aug-15-99
39
1080
23.5
3.6
Sep-23-99
43
1200
30.3
3.0
Oct-18-99
44
1090
18.5
3.4
Nov-18-99
49
1190
19.7
2.9
Dec-15-99
48
1140
17.8
3.4
         
1999 Average
42
1130
20.9
3.3

John’s (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 29, 1992

Percent area covered with aquatic vegetation (PAC, %)
4
Percent of lake's volume filled with vegetation (PVI, %)
2
Average emergent plant biomass (kg wet wt/m2)
4.6
Average floating-leaved plant biomass (kg wet wt/m2)
12.6
Average submersed plant biomass (kg wet wt/m2)
0.8
Average width of emergent and floating-leaved zone (ft.)
202
Average lake depth (m)
2

Frequency that plant species occur in 20 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
cat-tail Typha spp.
95
floating water-hyacinth Eichhornia crassipes
89
water-lettuce Pistia stratiotes
68
fragrant water-lily Nymphaea odorata
63
Baldwin flat sedge Cyperus globulosus
58
common salvinia Salvinia rotundifolia
42
duck-potato Sagittaria lancifolia
42
water primrose Ludwigia octovalvis
42
purple bladderwort Utricularia purpurea
32
torpedograss Panicum repens
32
slender spikerush Eleocharis baldwinii
26
flat-sedge Cyperus odoratus
26
musk-grass Chara spp.
26
water-pennywort Hydrocotyle umbellata
21
alligator-weed Alternanthera philoxeroides
16
banana-lily Nymphoides aquatica
16
pickerelweed Pontederia cordata
16
willow Salix spp.
16
spatterdock Nuphar luteum
11
red root Lachnanthes caroliniana
11
water sprite Ceratopteris thalictroides
5
southern naiad Najas guadalupensis
5
para grass Brachiaria mutica
5
soft rush Juncus effusus
5
jointed flat sedge Cyperus haspan
5

John’s (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 20, 1994

Percent area covered with aquatic vegetation (PAC, %)
22
Percent of lake's volume filled with vegetation (PVI, %)
4
Average emergent plant biomass (kg wet wt/m2)
1.7
Average floating-leaved plant biomass (kg wet wt/m2)
0.5
Average submersed plant biomass (kg wet wt/m2)
0.3
Average width of emergent and floating-leaved zone (ft.)
71
Average lake depth (m)
2

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

Common Name Plant Species
Frequency (%)
cat-tail Typha spp.
100
smartweed Polygonum hydropiperoides
80
duck-potato Sagittaria lancifolia
60
water primrose Ludwigia octovalvis
60
willow Salix spp.
50
slender spikerush Eleocharis baldwinii
40
wax myrtle Myrica cerifera
40
torpedograss Panicum repens
40
red root Lachnanthes caroliniana
40
common salvinia Salvinia rotundifolia
30
alligator-weed Alternanthera philoxeroides
30
fragrant water-lily Nymphaea odorata
30
pickerelweed Pontederia cordata
30
flat-sedge Cyperus odoratus
30
maidencane Panicum hemitomon
30
spatterdock Nuphar luteum
20
respuinata bladderwort Utricularia resupinata
20
water-lettuce Pistia stratiotes
10
common duckweed Lemna minor
10
floating water-hyacinth Eichhornia crassipes
10
red ludwigia Ludwigia repens
10
cone-spur bladderwort Utricularia gibba
10
purple bladderwort Utricularia purpurea
10
para grass Brachiaria mutica
10
yellow-eyed grass Xyris spp.
10
bladderwort Utricularia foliosa
10
jointed flat sedge Cyperus haspan
10

John’s (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 23, 1998

Percent area covered with aquatic vegetation (PAC, %)
8
Percent of lake's volume filled with vegetation (PVI, %)
1
Average emergent plant biomass (kg wet wt/m2)
4.7
Average floating-leaved plant biomass (kg wet wt/m2)
2.2
Average submersed plant biomass (kg wet wt/m2)
0.1
Average width of emergent and floating-leaved zone (ft.)
64
Average lake depth (m)
3

Frequency that plant species occur in 30 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
torpedograss Panicum repens
80
alligator-weed Alternanthera philoxeroides
77
duck-potato Sagittaria lancifolia
67
cat-tail Typha spp.
67
water-pennywort Hydrocotyle umbellata
63
water primrose Ludwigia octovalvis
63
willow Salix spp.
47
fragrant water-lily Nymphaea odorata
37
maidencane Panicum hemitomon
37
pickerelweed Pontederia cordata
30
red ludwigia Ludwigia repens
23
smartweed Polygonum hydropiperoides
20
buttonbush Cephalanthus occidentalis
20
leconte sedge Cyperus lecontei
20
elderberry Sambucus canadensis
20
flat-sedge Cyperus odoratus
17
floating water-hyacinth Eichhornia crassipes
13
slender spikerush Eleocharis baldwinii
13
wax myrtle Myrica cerifera
13
common salvinia Salvinia rotundifolia
10
banana-lily Nymphoides aquatica
10
sedge spp. Cyperus spp.
10
fanwort Cabomba caroliniana
7
Australian pine Casuarina equisetifolia
7
common duckweed Lemna minor
3
spatterdock Nuphar luteum
3
bacopa Bacopa monnieri
3
hydrilla Hydrilla verticillata
3
slender naiad Najas minor
3
salt-bush Baccharis spp.
3
southern water-grass Hydrochloa caroliniensis
3
para grass Brachiaria mutica
3
knot grass Paspalum distichum
3
bald cypress Taxodium distichum
3
bulrush spp. Juncus spp.
3

 
 
 

John’s (Orange County)

Electrofishing Data

     
Canfield and Hoyer (1992) Ranges
Species1
#/hr
kg/hr2
min weight (kg/hr)
mean weight (kg/hr)
max weight (kg/hr)
Bluegill
274
5.9
0.3
50.3
447
Bowfin
8
15.3
3
54.5
225
Brook silverside
9
0
0
0.2
1.4
Chain pickerel
2
1.4
0
17.5
57.1
Dollar sunfish
2
0
0
0.3
0.5
Florida gar
27
16.6
0.8
50.1
328.6
Gizzard shad
2
1.2
0
10.3
39.5
Golden shiner
50
1.4
0
6.9
65
Lake chubsucker
10
1.1
0.1
40.7
161.9
Largemouth bass
70
36.8
1.1
82
284.6
Redear sunfish
48
3.8
0.1
24.3
183.1
Seminole killifish
18
0.2
0
4.2
22.3
           
Total
520
83.7
      

 

1 Total # of species = 12.

2 Weights calculated using regressions from Hoyer and Canfield 1994 and from Bill Schaeffer, Florida Fish and Wildlife Conservation Commission (personal communication).
 
 

Catch per unit of effort (kg of fish / hour of sampling) versus total chlorophyll (mg/m3) and number of fish species collected versus surface area of lake for 60 Florida lakes sampled by Canfield and Hoyer (1992) (•) and Lake John’s (Orange County) electrofishing sampling (o). The lines represent linear regressions for logged values of the 60 Florida lakes.


John’s (Orange County)

Trawl Data

Species 
Size Group
Mean CPM
Range of TL (mm)
1998
species other than black crappie were not measured
1999
bluegill
all
4.18
12 - 240
bluegill
318 cm
0.09
-
bowfin
all
0.03
517
brown bullhead
all
0.03
319
channel catfish
all
0.03
478
Florida gar
all
0.09
486 - 722
gizzard shad
all
0.85
114 - 313
largemouth bass
all
0.12
128 - 230
longnose gar
all
0.03
1,110
redear
all
0.51
114 - 262
redear
318 cm
0.33
-
warmouth
all
0.06
11 - 98

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