Little Weir (Marion County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 29°1'5", Longitude 81°58'39"

Period of record: 89 sampling dates; July 29, 1989 to March 22, 1999

Surface area (LAKEWATCH): 320 acres / 130 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Lake Weir/Leesburg Upland

Geologic formation (Brooks 1981):

The geology is dominated by deeply weathered clayey sand and granular sand of the Hawthorne Formation.

Physiographic region (Brooks 1981):

The water body lies in the Central Lakes 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Supplemental, unpublished water chemistry data, University of Florida.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
6.6
 Sulfate (mg/L)
6.7
Total alkalinity (mg/L as CaCO3)
4.3
 Calcium (mg/L)
2.0
Conductance (µS/cm @ 25 °C)
153
 Magnesium (mg/L)
3.0
Color (Pt-Co units)
9
 Sodium (mg/L)
20.0
Chloride (mg/L)
36.8
 Potassium (mg/L)
2.2
Silicon (mg/L)
0.1
    

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)
4
12
22
Long-term total nitrogen concentrations (µg/L)
630
870
1070
Long-term total chlorophyll concentrations (µg/L)
1.0
8.8
18.3
Long-term Secchi depth (ft)
3.6
6.3
8.8

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-13-99
5
720
4.0
8.0
Feb-15-99
9
760
7.3
7.3
Mar-22-99
8
690
5.7
7.8
         
1999 Average
7
730
5.7
7.7

Little Weir (Marion County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on May 19, 1992

Percent area covered with aquatic vegetation (PAC, %)
70
Percent of lake's volume filled with vegetation (PVI, %)
6
Average emergent plant biomass (kg wet wt/m2)
2.0
Average floating-leaved plant biomass (kg wet wt/m2)
1.9
Average submersed plant biomass (kg wet wt/m2)
1.2
Average width of emergent and floating-leaved zone (ft.)
71
Average lake depth (m)
3

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

Common Name Plant Species
Frequency (%)
rush fuirena Fuirena scirpoidea
80
fragrant water-lily Nymphaea odorata
70
bladderwort Utricularia foliosa
70
lemon bacopa Bacopa caroliniana
60
maidencane Panicum hemitomon
60
slender spikerush Eleocharis baldwinii
50
banana-lily Nymphoides aquatica
50
water-pennywort Hydrocotyle umbellata
50
Florida bladderwort Utricularia floridana
40
smartweed Polygonum hydropiperoides
30
cat-tail Typha spp.
30
spatterdock Nuphar luteum
20
red ludwigia Ludwigia repens
20
bog-moss Mayaca fluviatilis
20
variableleaf pondweed Potamogeton diversifolius
20
willow Salix spp.
20
sawgrass Cladium jamaicense
20
torpedograss Panicum repens
20
red root Lachnanthes caroliniana
20
respuinata bladderwort Utricularia resupinata
20
duck-potato Sagittaria lancifolia
10
pickerelweed Pontederia cordata
10
dwarf arrowhead Sagittaria subulata
10
purple bladderwort Utricularia purpurea
10
elephant-ear Colocasia esculenta
10
water spikerush Eleocharis elongata
10

Little Weir (Marion County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 14, 1998

Percent area covered with aquatic vegetation (PAC, %)
22
Percent of lake's volume filled with vegetation (PVI, %)
3
Average emergent plant biomass (kg wet wt/m2)
2.7
Average floating-leaved plant biomass (kg wet wt/m2)
2.5
Average submersed plant biomass (kg wet wt/m2)
0.9
Average width of emergent and floating-leaved zone (ft.)
78
Average lake depth (m)
3

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

Common Name Plant Species
Frequency (%)
rush fuirena Fuirena scirpoidea
90
banana-lily Nymphoides aquatica
80
fragrant water-lily Nymphaea odorata
80
Florida bladderwort Utricularia floridana
80
wax myrtle Myrica cerifera
70
pickerelweed Pontederia cordata
60
sawgrass Cladium jamaicense
60
maidencane Panicum hemitomon
60
red root Lachnanthes caroliniana
60
duck-potato Sagittaria lancifolia
50
slender spikerush Eleocharis baldwinii
50
lemon bacopa Bacopa caroliniana
50
stonewort Nitella spp.
50
respuinata bladderwort Utricularia resupinata
50
bladderwort Utricularia foliosa
30
spatterdock Nuphar luteum
20
cat-tail Typha spp.
20
water-pennywort Hydrocotyle umbellata
20
variable-leaf milfoil Myriophyllum heterophyllum
20
salt-bush Baccharis spp.
20
water primrose Ludwigia octovalvis
20
red ludwigia Ludwigia repens
10
elephant-ear Colocasia esculenta
10
buttonbush Cephalanthus occidentalis
10
willow Salix spp.
10
torpedograss Panicum repens
10
yellow-eyed grass Xyris spp.
10
knot grass Paspalum distichum
10
leconte sedge Cyperus lecontei
10
bald cypress Taxodium distichum
10
elderberry Sambucus canadensis
10
rush spp. Juncus dichotomus
10

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