Ivanhoe Middle (Orange County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°33'48", Longitude 81°22'49"

Period of record: 89 sampling dates; April 20, 1992 to November 23, 1999

Surface area (LAKEWATCH): 69 acres / 28 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Supplemental, unpublished water chemistry data, University of Florida.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
8.0
 Sulfate (mg/L)
13.0
Total alkalinity (mg/L as CaCO3)
54.5
 Conductance (µS/cm @ 25 °C)
199
Color (Pt-Co units)
13
 Chloride (mg/L)
15.7

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 89 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
21
31
48
Long-term total nitrogen concentrations (µg/L)
410
630
850
Long-term total chlorophyll concentrations (µg/L)
8.7
26.9
55.7
Long-term Secchi depth (ft)
2.6
4.2
6.9

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-29-99
25
570
17.3
5.0
Feb-15-99
28
520
19.3
5.5
Mar-11-99
25
560
14.7
5.2
Apr-30-99
31
540
23.3
4.3
Jun-30-99
36
710
34.7
4.0
Jul-21-99
27
670
23.7
4.0
Aug-23-99
30
840
36.0
3.7
Sep-20-99
36
850
55.7
3.5
Oct-21-99
29
660
34.0
4.0
Nov-23-99
34
680
44.3
3.5
         
1999 Average
30
660
30.3
4.3

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 Middle (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 9, 1993


Percent area covered with aquatic vegetation (PAC, %)
50
Percent of lake's volume filled with vegetation (PVI, %)
8
Average emergent plant biomass (kg wet wt/m2)
4.0
Average floating-leaved plant biomass (kg wet wt/m2)
0.4
Average submersed plant biomass (kg wet wt/m2)
1.6
Average width of emergent and floating-leaved zone (ft.)
11
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
70
alligator-weed Alternanthera philoxeroides
50
tapegrass Vallisneria americana
50
wax myrtle Myrica cerifera
50
torpedograss Panicum repens
50
elephant-ear Colocasia esculenta
40
spatterdock Nuphar luteum
20
pickerelweed Pontederia cordata
20
cat-tail Typha spp.
20
water-pennywort Hydrocotyle umbellata
20
willow Salix spp.
20
giant bulrush Scirpus californicus
20
yellow nut-grass Cyperus esculentus
20
water primrose Ludwigia octovalvis
10
para grass Brachiaria mutica
10
elderberry Sambucus canadensis
10
Baldwin flat sedge Cyperus globulosus
10

Ivanhoe Middle (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 3, 1999

Percent area covered with aquatic vegetation (PAC, %)
26
Percent of lake's volume filled with vegetation (PVI, %)
7
Average emergent plant biomass (kg wet wt/m2)
2.1
Average floating-leaved plant biomass (kg wet wt/m2)
1.9
Average submersed plant biomass (kg wet wt/m2)
0.3
Average width of emergent and floating-leaved zone (ft.)
25
Average lake depth (m)
3

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

Common Name Plant Species
Frequency (%)
giant bulrush Scirpus californicus
70
bald cypress Taxodium distichum
70
spatterdock Nuphar luteum
50
wax myrtle Myrica cerifera
50
willow Salix spp.
30
torpedograss Panicum repens
30
pickerelweed Pontederia cordata
20
water-pennywort Hydrocotyle umbellata
20
elephant-ear Colocasia esculenta
20
American lotus Nelumbo lutea
10
cat-tail Typha spp.
10
tapegrass Vallisneria americana
10
water primrose Ludwigia octovalvis
10
knot grass Paspalum distichum
10
giant spikerush Eleocharis interstincta
10
red maple Acer rubrum
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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