Micheal Finnell California Department of Parks and Recreation

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Presentation transcript:

Quantifying Efficacy of Submersed Aquatic Vegetation Management in the Sacramento-San Joaquin Delta Micheal Finnell California Department of Parks and Recreation Division of boating and Waterways Aquatic Invasive species Unit

Purpose Use hydroacoustics to map Submersed Aquatic Vegetation (SAV) in the Sacramento- San Joaquin Delta Use online GIS algorithm to process raw sonar files Create a model that will process hydroacoustic data and produce raster-based map Compare rasters over time and create quantitative metric from data Provide measure of accuracy Use metric for SAV management practices

Background Division of Boating and Waterways designated state lead agency in controlling invasive aquatic plants in the Sacramento-San Joaquin Delta (Harbors & Navigation Code 64 & 64.5) Invasive Submersed Aquatic Vegetation (SAV) clog waterways, eco-engineer environment, and displace native species (become monocultures) Current method of control: Fluridone (herbicide)

Background Three methods of monitoring and mapping SAV Remotely sensed hyperspectral imagery from outside agencies Time intensive, costly Rigorous scheduling for imagery to be collected during low tide Questionable whether funding for Delta-wide project will continue Hydroacoustic (sonar) DBW currently using commercial grade and online GIS platform, BioBase (www.cibiobase.com) Field Surveys Only method that can determine exact species composition

Invasive SAV Species Brazilian waterweed Coontail (Egeria densa) curlyleaf pondweed (Potamogeton crispus). Coontail (Ceratophyllum demersum) Fanwort (Cabomba caroliniana)

Native SAV Species common waterweed (Elodea canadensis) sago pondweed (Stuckenia pectinata) Threadleaf pondweed (Potomogeton diversifoliosus) Photo by Ondřej Zicha American pondweed (Potamogeton nodosus) Potamogeton richardsonii Potamogeton sp.

Methods Study Area and Sites Legal San Joaquin-Sacramento Delta 2424.5 surface acres

Methods Lowrance HDS5 / HDS7 Consumer-grade echosounder Single Beam 20 degree tranducer Field transect design: 10 – 30 meters

Methods: THE DATA

Methods: THE MODEL Egeria Tool

RESULTS

RESULTS 17 Sites Mapped for Pre-Treatment and Post-Treatment 15 Sites showed improvement (decrease in biovolume) 2 Sites showed increase in biovolume even after treatment Overall Mean Percent Biovolume Reduction: -7.65+ 8.44 (t = -1.9209, df = 16, p = 0.07275)

Results Accuracy 22 Geotagged Photos Correspond with areas of high biovolume (>80%)

Conclusions and Considerations First season results seem low, but sets baseline for future mapping and treatments Hydrologic considerations Comparison with recent hyperspectral imagery