North (Marion)

Location: Latitude 29°10'3", Longitude 81°52'47"

Period of record: 94 sampling dates; April 18, 1990 to December 28, 1998

Surface area (LAKEWATCH): 223 acres / 90 hectacres     Click here for Bathymetric Map

Lake Region (Griffith et al. 1997): Central Valley

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 lake lies in the Lynne Karst division of the Central Lake District.

Other LAKEWATCH data available: Aquatic plant survey, supplemental water chemistry, and bathymetric map

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average and maximum value for the 94 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
12
20
37
Long-term total nitrogen concentrations (µg/L)
480
620
920
Long-term total chlorophyll concentrations (µg/L)
2.0
6.4
36.3
Long-term Secchi depth (ft)
3.0
5.7
8.9

1998 Florida LAKEWATCH Data

Numbers reported below are monthly averages calculated from 3 mid-lake stations for total phosphorus (TP, µg/L),
total nitrogen (TN, µg/L), chlorophyll (CHL, µg/L) and Secchi depth (SECCHI, ft) during 1998:

Date
TP (µg/L)
TN (µg/L)
CHL (µg/L)
SECCHI (ft)
Jan-14-98
16
710
6.7
6.3
Feb-19-98
20
620
6.3
4.7
Mar-17-98
23
820
9.0
3.9
Apr-14-98
27
880
12.0
3.3
May-14-98
22
740
7.3
4.7
Jun-08-98
34
680
9.0
5.0
Jul-13-98
24
650
8.7
5.0
Sep-24-98
20
640
6.0
5.0
Oct-31-98
18
600
4.3
6.0
Nov-30-98
15
580
4.7
6.8
Dec-28-98
16
590
.
7.7
         
1998 Average
21
680
7.4
5.3

 

Aquatic plant data collected on July 21, 1999

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)
4.7
Average floating-leaved plant biomass (kg wet wt/m2)
6.1
Average submersed plant biomass (kg wet wt/m2)
0
Average width of emergent and floating-leaved zone (ft.)
15.5

 

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

Common Name Plant species
Frequency (%)
sawgrass Cladium jamaicense
100
duck-potato Sagittaria lancifolia
100
wax myrtle Myrica cerifera
90
lizard's-tail Saururus cernuus
80
floating water-hyacinth Eichhornia crassipes
70
spatterdock Nuphar luteum
70
maidencane Panicum hemitomon
70
red maple Acer rubrum
60
buttonbush Cephalanthus occidentalis
40
water primrose Ludwigia octovalvis
30
pickerelweed Pontederia cordata
30
willow Salix spp.
20
alligator-weed Alternanthera philoxeroides
10
elephant-ear Colocasia esculenta
10
red ludwigia Ludwigia repens
10
banana-lily Nymphoides aquatica
10
torpedograss Panicum repens
10
common salvinia Salvinia rotundifolia
10