LIST OF FIGURES AND TABLESBrazilian Elodea

Lake Leland Integrated Aquatic Plant Management Plan

 


LIST OF FIGURES

FIGURE 1 Maps showing the spread of Brazilian elodea in Lake Leland from 1994 to 1997 (1994-1996 maps are from Parsons 1997).

FIGURE 2 Topographic map showing boundary of Lake Leland watershed (from USGS 7.5 minute series quadrangle maps-Uncas, Center, Quilcene, and Mt. Walker).

FIGURE 3 Map showing wetlands in Lake Leland watershed (from Jefferson County’s Critical Areas-Wetland Map, July 8, 1994).

FIGURE 4 Bathymetric map of Lake Leland showing County Park facilities including fishing dock, boat launch, and swimming area (crosshatched).

FIGURE 5 Total phosphorus concentrations in samples collected from the main lake and south end of Lake Leland from 1974 to 1998 (data courtesy of Washington Department of Ecology).

FIGURE 6 Total phosphorus concentrations in samples collected from the main lake and south end of Lake Leland from 1993 to 1998. Data is the same as in Figure 5, but the shorter time frame allows better discernment between main lake and south end concentrations (data courtesy of Washington Department of Ecology).

FIGURE 7 Chlorophyll a concentrations in samples collected from the main lake and south end of Lake Leland from 1993 to 1998 (data courtesy of Washington Department of Ecology).

FIGURE 8 Secchi disk readings taken in Lake Leland (main lake) from 1993 to 1998 (data courtesy of Washington Department of Ecology).

FIGURE 9 Map showing locations of culverts where Lake Leland tributaries and Leland Creek were sampled monthly from January to September 1998.

FIGURE 10 Comparison of combined flows from 10 Lake Leland tributaries to the outflow from Leland Creek by month.

FIGURE 11 Dissolved oxygen levels measured on September 3-4, 1998 every 4 hours at 0.5 meter depth intervals in three habitat types in the south end of Lake Leland.

FIGURE 12 Lake Leland May to October water levels from 1991 to 1998.

FIGURE 13 Map showing staff gage locations on Lake Leland and Leland Creek.

FIGURE 14 Relationship of Lake Leland water level to levels at three locations on Leland Creek from March to October 1998.

FIGURE 15 Lake Leland monitoring sites for plant distribution (lines) and plant abundance (circles). Depth contours are shown in feet.

FIGURE 16 Examples of varying plant quantities representing three indices assigned to samples collected along distribution transects: 1=sparse (top), 2=moderate (middle), and 3=dense (bottom).

FIGURE 17 Frequency of plants occurring in 27 transects (all depths combined) sampled at 150 meter intervals around the shoreline of Lake Leland on September 3-5, 1997.

FIGURE 18 Distribution of Brazilian elodea in Lake Leland surveyed on September 3-5, 1997. Abundance indices show the relative abundance of the plant along transects at 0.5 (closest to shore), 1, 2, and 3 meter depths.

FIGURE 19 Frequency of plants occurring in 27 transects at four different depths sampled at 150 meter intervals around the shoreline of Lake Leland on September 3-5, 1997.

FIGURE 20 Distribution of yellow flag iris in Lake Leland surveyed on September 3-5, 1997. Abundance indices show the relative abundance of the plant along transects at 0.5 (closest to shore), 1, 2, and 3 meter depths.

FIGURE 21 Distribution of reed canary grass in Lake Leland surveyed on September 3-5, 1997. Abundance indices show the relative abundance of the plant along transects at 0.5 (closest to shore), 1, 2, and 3 meter depths.

FIGURE 22 Biomass by site and depth of plants sampled in Lake Leland in August 1997. For sites and depths not listed, biomass was zero.

FIGURE 23 Map of Lake Leland and Leland Creek showing high intensity control zones.

LIST OF TABLES

TABLE 1 Relative abundance of plants sampled at four different depths on 27 transects at 150 meter intervals around the shoreline of Lake Leland on September 3-5, 1997: 1=sparse, 2=moderate, and 3=dense.

TABLE 2 Average dry weight and standard deviation (SD) for plants collected at 1, 2, and 3 meter depths at five sites in Lake Leland in August 1997. If sites and depths are not listed, plant biomass was zero.


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Contact Kathy Hamel by e-mail at kham461@ecy.wa.gov