Istokpoga (Highlands County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 27°23'15", Longitude 81°18'18"

Period of record: 47 sampling dates; February 24, 1996 to December 21, 1999

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

Lake Region (Griffith et al. 1997): Kissimmee/Okeechobee Lowland

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 Istokpoga Paririe division of the Eastern Flatwoods District.

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 4 months sampled:
 
pH
7.1
 Sulfate (mg/L)
18.2
Total alkalinity (mg/L as CaCO3)
10.5
 Calcium (mg/L)
8.7
Conductance (µS/cm @ 25 °C)
105
 Magnesium (mg/L)
8.5
Color (Pt-Co units)
117
 Sodium (mg/L)
7.7
Chloride (mg/L)
16.2
 Potassium (mg/L)
2.5
Silicon (mg/L)
2.5
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 47 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
16
46
83
Long-term total nitrogen concentrations (µg/L)
750
1120
1710
Long-term total chlorophyll concentrations (µg/L)
5.0
30.4
73.0
Long-term Secchi depth (ft)
1.6
3.2
6.7

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-26-99
33
870
16.0
3.8
Feb-26-99
26
800
5.3
6.7
Mar-25-99
26
880
5.0
5.0
Apr-30-99
33
960
17.3
3.8
May-25-99
36
800
11.3
4.2
Jun-21-99
49
1010
24.3
3.4
Jul-27-99
38
1210
30.7
3.2
Aug-19-99
60
1340
61.3
2.3
Sep-23-99
72
1620
66.3
1.6
Oct-25-99
80
1710
73.0
2.1
Nov-23-99
61
1530
49.3
2.0
Dec-21-99
58
1410
44.0
2.3
         
1999 Average
48
1180
33.7
3.4

Istokpoga (Highlands County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 8, 1999

Percent area covered with aquatic vegetation (PAC, %)
50
Percent of lake's volume filled with vegetation (PVI, %)
37
Average emergent plant biomass (kg wet wt/m2)
6.0
Average floating-leaved plant biomass (kg wet wt/m2)
6.3
Average submersed plant biomass (kg wet wt/m2)
2.3
Average width of emergent and floating-leaved zone (ft.)
443
Average lake depth (m)
2

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

Common Name Plant Species
Frequency (%)
cat-tail Typha spp.
90
spatterdock Nuphar luteum
77
water primrose Ludwigia octovalvis
77
hydrilla Hydrilla verticillata
70
water-pennywort Hydrocotyle umbellata
60
common salvinia Salvinia rotundifolia
53
bald cypress Taxodium distichum
50
water-lettuce Pistia stratiotes
47
big rose mallow Hibiscus grandiflorus
47
floating water-hyacinth Eichhornia crassipes
43
duck-potato Sagittaria lancifolia
43
alligator-weed Alternanthera philoxeroides
40
coontail Ceratophyllum demersum
40
wax myrtle Myrica cerifera
40
giant bulrush Scirpus californicus
40
para grass Brachiaria mutica
37
willow Salix spp.
33
azolla Azolla caroliniana
30
common duckweed Lemna minor
23
maidencane Panicum hemitomon
23
green algae Chlorphyta
23
baby-tears Micranthemum umbrosum
20
tapegrass Vallisneria americana
20
slender spikerush Eleocharis baldwinii
17
frog's-bit Limnobium spongia
17
purple bladderwort Utricularia purpurea
17
flat-sedge Cyperus odoratus
17
sedge spp. Cyperus spp.
17
pickerelweed Pontederia cordata
13
cone-spur bladderwort Utricularia gibba
13
giant reed Phragmites australis
13
red maple Acer rubrum
13
melaleuca Melaleuca quinquenervia
10
torpedograss Panicum repens
10
American lotus Nelumbo lutea
7
smartweed Polygonum hydropiperoides
7
African elodea Lagarosiphon spp.
7
elephant-ear Colocasia esculenta
7
. Scirpus cubensis
7
Istokpoga (Highlands County)

Florida LAKEWATCH Aquatic Plant Summary (continued)

Aquatic plant data collected on July 8, 1999
Common Name Plant Species
Frequency (%)
common arrowhead Sagittaria latifolia
3
Eurasian watermilfoil Myriophyllum spicatum
3
big floating bladderwort Utricularia inflata
3
purple fanwort Cabomba pulcherrima
3
Illinois pondweed Potamogeton illinoensis
3
buttonbush Cephalanthus occidentalis
3
southern water-grass Hydrochloa caroliniensis
3
. Lyngbya spp.
3
red root Lachnanthes caroliniana
3
knot grass Paspalum distichum
3
three-square Scirpus americanus
3
elderberry Sambucus canadensis
3
climbing hempvine Mikania scandens
3

Istokpoga (Highlands County)

Electrofishing Data

     
Canfield and Hoyer (1992) Ranges
Species1
#/hr
kg/hr2
min weight (kg/hr)
mean weight (kg/hr)
max weight (kg/hr)
Black crappie
2
0
0.1
6.4
28.7
Bluegill
132
21.6
0.3
50.3
447
Bluespotted sunfish
1
0
0
0
0.1
Bowfin
1
3.9
3
54.5
225
Brook silverside
34
0.1
0
0.2
1.4
Brown bullhead
3
2.1
0.1
14.5
72.1
Chain pickerel
6
0.9
0
17.5
57.1
Dollar sunfish
13
0.1
0
0.3
0.5
Eastern mosquitofish
11
0
0
0.14
1.97
Florida gar
6
4
0.8
50.1
328.6
Gizzard shad
1
0.3
0
10.3
39.5
Golden shiner
39
0.1
0
6.9
65
Inland silverside
29
0
.
.
.
Lake chubsucker
8
2.8
0.1
40.7
161.9
Largemouth bass
42
3.7
1.1
82
284.6
Pugnose minnow
114
0.1
.
.
.
Redear sunfish
26
1.2
0.1
24.3
183.1
Seminole killifish
33
0.3
0
4.2
22.3
Spotted sunfish
7
0.1
0
0.9
3.2
Taillight shiner
43
0
0
0.1
0.4
Threadfin shad
2
0
0
2.7
10.9
Warmouth
25
1.7
0
1.5
12
Yellow bullhead
2
0.3
0
2.2
7.2
           
Total
580
43.3
      

1 Total # of species = 23.
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 Istokpoga (Highlands County) electrofishing sampling (o). The lines represent linear regressions for logged values of the 60 Florida lakes.

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