Sampling The Benthos
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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
• works differently indifferent seds
• soft seds – sinksdeeper
• hard seds – doesnot grab as much
Dredge
- Collects materials from benthic zone
-Often used to clear channelsfor navigation
- Sometimes to collect organisms
SCUBA
• self-contained underwater breathingapparatus
• allows person to see and sample• limited time on bottom• limited depth – about 100 feet
R.O.V. remotely operated
vehicle
• small robot operated from boat• cables to boat• safer and cheaper
Side scan sonar
• uses sound waves and computerimaging to get an image of theocean bottom
• towed behind ship• can determine benthic habitats