| Autor: |
Johnston, Brett D., Graham, Jennifer L., Foster, Guy M., Downing, Bryan D. |
| Předmět: |
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| Zdroj: |
Scientific Investigations Report; 2022, preceding pi-36, 44p |
| Abstrakt: |
In 2019, the U.S. Geological Survey evaluated the performance of the Turner Designs, Inc. PhytoFind, an in-place phytoplankton classification tool. The sensor was tested with sample blanks, monoculture and mixed phytoplankton cultures, and turbidity challenges in a laboratory, and was tested on a 120-mile survey of the Caloosahatchee and St. Lucie Rivers in Florida, including Lake Okeechobee. Results include the following: • The mixed phytoplankton group fluorescence channel (green excitation sensor) of the PhytoFind can be sensitive to interference. • The PhytoFind generally overestimated chlorophyll concentration relative to laboratory-measured chlorophyll a concentrations. • Turbidity interference may be less apparent in samples where green algae (chlorophytes) represent a high relative percentage of biovolume. • The dissolved organic matter compensation feature was effective in the environmental waters sampled during this evaluation. • The correlation between percent chlorophyll contribution per phytoplankton group measured by the Phyto-Find and relative percent biovolume per phytoplankton group measured in the laboratory varied and was not explicitly determined to be related to dominant taxa, phytoplankton community composition, or environmental conditions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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