Ivanhoe East (Orange County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°33'48", Longitude 81°22'33"

Period of record: 82 sampling dates; March 24, 1992 to December 7, 1999

Surface area (LAKEWATCH): 109 acres / 44 hectacres     Bathymetric Map

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

Geologic formation (Brooks 1981):

The geology is dominated by phosphatic sand, silty sand, and clay of the Hawthorne Formation.

Physiographic region (Brooks 1981):

The water body lies in the Orlando Promontory division of the Central Lake District.
 
 

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 2 months sampled:
 
pH
9.0
 Sulfate (mg/L)
12.0
Total alkalinity (mg/L as CaCO3)
63.0
 Conductance (µS/cm @ 25 °C)
211
Color (Pt-Co units)
12
 Chloride (mg/L)
15.2

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 82 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
18
29
41
Long-term total nitrogen concentrations (µg/L)
480
770
1360
Long-term total chlorophyll concentrations (µg/L)
10.3
33.4
88.7
Long-term Secchi depth (ft)
1.3
3.0
5.0

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-19-99
23
740
34.0
2.8
Feb-09-99
22
800
29.7
2.2
Apr-06-99
30
970
27.7
2.2
May-04-99
27
870
25.7
2.3
May-28-99
30
990
33.0
.
Aug-31-99
23
870
45.0
2.3
Sep-23-99
28
970
47.3
2.5
Oct-05-99
23
800
37.5
2.7
Nov-09-99
33
810
46.3
2.7
Dec-07-99
39
890
.
2.7
         
1999 Average
28
870
36.2
2.5

Ivanhoe (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 28, 1994

Percent area covered with aquatic vegetation (PAC, %)
14
Percent of lake's volume filled with vegetation (PVI, %)
2
Average emergent plant biomass (kg wet wt/m2)
1.7
Average floating-leaved plant biomass (kg wet wt/m2)
0.6
Average submersed plant biomass (kg wet wt/m2)
2.6
Average width of emergent and floating-leaved zone (ft.)
10
Average lake depth (m)
4

Frequency that plant species occur in 15 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
bald cypress Taxodium distichum
67
tapegrass Vallisneria americana
60
elephant-ear Colocasia esculenta
60
alligator-weed Alternanthera philoxeroides
40
pickerelweed Pontederia cordata
40
water-pennywort Hydrocotyle umbellata
40
wax myrtle Myrica cerifera
33
torpedograss Panicum repens
33
willow Salix spp.
27
spatterdock Nuphar luteum
20
water primrose Ludwigia octovalvis
20
giant bulrush Scirpus californicus
20
baby-tears Micranthemum umbrosum
13
maidencane Panicum hemitomon
13
cat-tail Typha spp.
7
soft rush Juncus effusus
7

Ivanhoe East (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 9, 1993

Percent area covered with aquatic vegetation (PAC, %)
28
Percent of lake's volume filled with vegetation (PVI, %)
3
Average emergent plant biomass (kg wet wt/m2)
0.9
Average floating-leaved plant biomass (kg wet wt/m2)
0.0
Average submersed plant biomass (kg wet wt/m2)
3.0
Average width of emergent and floating-leaved zone (ft.)
4
Average lake depth (m)
4

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

Common Name Plant Species
Frequency (%)
bald cypress Taxodium distichum
90
water-pennywort Hydrocotyle umbellata
80
elephant-ear Colocasia esculenta
80
torpedograss Panicum repens
80
tapegrass Vallisneria americana
70
alligator-weed Alternanthera philoxeroides
50
pickerelweed Pontederia cordata
30
giant bulrush Scirpus californicus
30
wax myrtle Myrica cerifera
20
cat-tail Typha spp.
10
water primrose Ludwigia octovalvis
10
willow Salix spp.
10
maidencane Panicum hemitomon
10
elderberry Sambucus canadensis
10
jointed flat sedge Cyperus haspan
10

Ivanhoe East (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 3, 1999


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)
4.6
Average floating-leaved plant biomass (kg wet wt/m2)
0.0
Average submersed plant biomass (kg wet wt/m2)
3.1
Average width of emergent and floating-leaved zone (ft.)
8
Average lake depth (m)
4

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

Common Name Plant Species
Frequency (%)
tapegrass Vallisneria americana
90
bald cypress Taxodium distichum
80
maidencane Panicum hemitomon
70
elephant-ear Colocasia esculenta
50
pickerelweed Pontederia cordata
40
giant bulrush Scirpus californicus
40
wax myrtle Myrica cerifera
30
water primrose Ludwigia octovalvis
30
torpedograss Panicum repens
20
elderberry Sambucus canadensis
20
water-pennywort Hydrocotyle umbellata
10
salt-bush Baccharis spp.
10
willow Salix spp.
10
musk-grass Chara spp.
10

 

Ivanhoe (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)
Blue tilapia
5
4.6
.
.
.
Bluegill
609
4.7
0.3
50.3
447
Brook silverside
1
0
0
0.2
1.4
Bluespotted sunfish
7
0
0
0
0.1
Channel catfish
1
0.8
.
.
.
Florida gar
4
4.1
0.8
50.1
328.6
Golden shiner
4
0.1
0
6.9
65
Largemouth bass
34
19.1
1.1
82
284.6
Eastern mosquitofish
6
0
0
0.14
1.97
Redbreast sunfish
30
1.2
1.3
2.8
4.7
Redear sunfish
40
1.4
0.1
24.3
183.1
Seminole killifish
353
3.3
0
4.2
22.3
Swamp darter
2
0
0
0
0
Tadpole madtom
1
0
0.02
0.02
0.02
Taillight shiner
1
0
0
0.1
0.4
Warmouth
3
0
0
1.5
12
           
Total
1101
39.2
      

 

1 Total # of species = 16.

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 Ivanhoe (Highlands County) electrofishing sampling (o). The lines represent linear regressions for logged values of the 60 Florida lakes.
 
 

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