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Aquatic Hyperspectral Data

Discover the critical need for fine-scale resolution data in aquatic environments to monitor variables such as turbidity, vegetation types, temperature, water elevation, and survey timing for effective ecosystem management. Learn how precise data can impact smelt and salmonid survival, predator-prey relationships, and overall habitat health.

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Aquatic Hyperspectral Data

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  1. Aquatic Hyperspectral Data Needs and desires

  2. Resolution • Need fine scale resolution to get data from small delta channels • Channels range in size, with many less than 20m. • Certain imagery would require meter/sub-meter resolution to be useful (eg. SAV, FAV).

  3. Turbidity • May have impacts on Smelt/Salmonid Survival • Increases Delta Smelt foraging success • Delta Smelt utilize turbid areas more frequently Probability of catching Delta Smelt in FMWT

  4. Salinity (EC) • Cue utilized for salmonidsmolt migration • X2 zone is highly utilized by Delta Smelt and may prove to be important for smelt recovery. Probability of catching Delta Smelt in FMWT

  5. Submerged Aquatic Vegetation • May contribute to non-native predatory fish species composition and success • May be utilized by migrating salmonidsmolts for cover/forage.

  6. Floating Aquatic Vegetation • Blocks sun from penetrating water column, potentially influencing primary productivity • Hyacinth has been shown to reduce O2 levels in the water. • Water loss through transpiration. • Provides ambush sites for non-native predatory fish

  7. Temperature • Higher temperatures (>16.5 °C) lead to • Higher risk for disease • Lower rates of feeding/increased metabolic demand • Reduced food availability • Increased exposure to warm-water tolerant predatory fish • Temperature induced mortality (>20-22 °C) • Large variation in temperature favors native fish assemblages

  8. Water elevation • Could prove useful for determining inundation of available floodplains.

  9. Riparian Vegetation • Contributes to lower water temperatures • Increases invertebrate food production

  10. Survey Timing • Key Migration Periods • Winter for Delta Smelt, Winter-Run Chinook Salmon, and Steelhead Spawning Migration • Spring for Smolt Outmigration, Striped Bass and Spring-Run Chinook Spawning Migration • Summer for Green Sturgeon Spawning Migration • Fall for Fall-Run and Late Fall-Run Chinook Salmon Spawning Migration

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