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Sampling The Benthos
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Sampling The Benthos

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    Sampling The Benthos Sampling The Benthos Presentation Transcript

    • SAMPLING THE BENTHOS
    • Sampling the Benthos
      • Used to determine:
        • diversity
        • biomass
        • distribution of life
        • historical data
    • Sampling the Benthos
      • Must assume that a small amount of material is representative of the larger area
      • Therefore, must take as many samples as time and money allow
    • Grab Like a crane with jaws to grab sediment & organisms
    • Grab
    • Grab
      • works differently in
      • different seds
      • soft seds – sinks
      • deeper
      • hard seds – does
      • not grab as much
    • Dredge
      • - Collects materials from
      • benthic zone
      • Often used to clear channels
      • for navigation
      • - Sometimes to collect organisms
    • Types of dredges: Dredge clam shell dredge
    • Types of dredges: Dredge suction dredge
    • scallop dredge backhoe dredge Types of dredges: Dredge
    • Trawl
      • net dragged behind boat
      • at various depths or
      • along bottom
    • Trawl
    • trawl tracks can damage benthic habitat Trawl
    • Epibenthic Sled
      • drag along bottom –
      • like dredge
      • can collect samples
      • can house equipment
    • Core drill to collect a long tube of sediment
    • Core good for analyzing historic changes over long periods of time
    • SCUBA
      • s elf- c ontained u nderwater b reathing
      • a pparatus
      • allows person to see and sample
      • limited time on bottom
      • limited depth – about 100 feet
    • Submersible Alvin small research submarine
    • Submersible Johnson Sea Link can go as deep as 4,000 meters
    • R.O.V. r emotely o perated v ehicle
      • small robot operated from boat
      • cables to boat
      • safer and cheaper
    • A.U.V.
      • autonomous underwater vehicle
      • small robot
      • no cables to surface
    • Satellites
      • used for navigation
      • and to map ocean
      • bottom
    • Satellites
      • Global map of ocean floor gravity
      • from Geosat and ERS-1 satellite altimetry
    • Side scan sonar
      • uses sound waves and computer
      • imaging to get an image of the
      • ocean bottom
      • towed behind ship
      • can determine benthic habitats
    • Side scan sonar