Dorr (Lake County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 29°0'5", Longitude 81°37'16"

Period of record: 103 sampling dates; January 30, 1990 to December 7, 1999

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

Lake Region (Griffith et al. 1997): Eastern Flatlands

Geologic formation (Brooks 1981):

The geology is dominated by dune sand and shell with silty sand, silt, and clay of the Princess Ann Formation.

Physiographic region (Brooks 1981):

The water body lies in the St. John’s Offset division and the Mount Dora Ridge subdivision of the Apopka Upland division of the Central Lake District.
 
 

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 5 months sampled:
 
pH
5.3
 Sulfate (mg/L)
7.6
Total alkalinity (mg/L as CaCO3)
1.6
 Calcium (mg/L)
2.1
Conductance (µS/cm @ 25 °C)
53
 Magnesium (mg/L)
3.2
Color (Pt-Co units)
91
 Sodium (mg/L)
5.1
Chloride (mg/L)
9.9
 Potassium (mg/L)
0.3
Silicon (mg/L)
1.3
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 103 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
11
17
28
Long-term total nitrogen concentrations (µg/L)
310
430
640
Long-term total chlorophyll concentrations (µg/L)
3.7
12.5
29.3
Long-term Secchi depth (ft)
1.0
2.8
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
Aug-09-99
15
380
10.3
3.2
Dec-07-99
13
460
16.0
3.5
         
1999 Average
14
420
13.2
3.4

Dorr (Lake County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 9, 1992

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)
1.8
Average floating-leaved plant biomass (kg wet wt/m2)
0.5
Average submersed plant biomass (kg wet wt/m2)
0.0
Average width of emergent and floating-leaved zone (ft.)
46
Average lake depth (m)
4

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

Common Name Plant Species
Frequency (%)
maidencane Panicum hemitomon
70
buttonbush Cephalanthus occidentalis
60
spatterdock Nuphar luteum
40
pickerelweed Pontederia cordata
30
bald cypress Taxodium distichum
30
water-moss Fontinalis spp.
20
water primrose Ludwigia octovalvis
20
giant bulrush Scirpus californicus
20
slender spikerush Eleocharis baldwinii
10
cat-tail Typha spp.
10
water-pennywort Hydrocotyle umbellata
10
southern cutgrass Leersia hexandra
10

Dorr (Lake County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 4, 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)
4.5
Average floating-leaved plant biomass (kg wet wt/m2)
1.9
Average submersed plant biomass (kg wet wt/m2)
0.0
Average width of emergent and floating-leaved zone (ft.)
45
Average lake depth (m)
4

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

Common Name Plant Species
Frequency (%)
maidencane Panicum hemitomon
80
spatterdock Nuphar luteum
60
wax myrtle Myrica cerifera
60
pickerelweed Pontederia cordata
50
buttonbush Cephalanthus occidentalis
50
slender spikerush Eleocharis baldwinii
30
water tupelo Nyssa aquatica
30
cat-tail Typha spp.
20
tapegrass Vallisneria americana
20
elephant-ear Colocasia esculenta
20
giant bulrush Scirpus californicus
20
umbrella sedge Cyperus alternifolius
20
common salvinia Salvinia rotundifolia
10
water-pennywort Hydrocotyle umbellata
10
hydrilla Hydrilla verticillata
10
water primrose Ludwigia octovalvis
10
flat-sedge Cyperus odoratus
10
southern water-grass Hydrochloa caroliniensis
10

Dorr (Lake 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
332
10
0.3
50.3
447
Brook silverside
43
0.1
0
0.2
1.4
Chain pickerel
5
3.7
0
17.5
57.1
Eastern mosquitofish
1
0
0.14
1.97
  
Golden shiner
56
1.2
0
6.9
65
Lake chubsucker
8
2
0.1
40.7
161.9
Largemouth bass
21
9.9
1.1
82
284.6
Redear sunfish
17
0.8
0.1
24.3
183.1
Spotted gar
9
8.8
.
.
.
Spotted sunfish
3
0.1
0
0.9
3.2
Warmouth
1
0
0
1.5
12
White catfish
1
0.2
1.9
4
8.7
Yellow bullhead
1
0.3
0
2.2
7.2
           
Total
498
37.1
      

 

1 Total # of species = 13.
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 Dorr (Lake County) electrofishing sampling (o). The lines represent linear regressions for logged values of the 60 Florida lakes.
 
 

Dorr (Lake County)

Trawl Data

Species Size Group Mean CPM Range of TL (mm)
1998
species other than black crappie were not measured
1999
bluegill
all
1.03
10 - 181
bluegill
_18 cm
0.03
-
gizzard shad
all
0.27
114 - 279
redear
all
0.20
95 - 118
redear
_18 cm
0
-

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