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ISCI 1001 (36)
Lecture

ICSInote13

3 Pages
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Department
Interdisciplinary Science
Course Code
ISCI 1001
Professor
John Buschek

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ISCI 1001  Nov 21 2013 Ocean Structure  Photic zone: 80% of incoming solar E is absorbed  Most of the 1­degree productivity of the ocean takes place here Pelagic Zone: between surface and ocean floor  Plankton: things that "float" around rather than swim Microscopic organism Phytoplankton­ plant­like, producers Zooplankton­ animal like, consumers Nekton­ Marine animals that swim around  Fishing ­Good example of IPAT, Impact=Population, Affluence (more demand on fish), and  Technology  Technology Ways of fishing Higher speeds for trawlers (80 km/h) Advanced solar Satellite navigation Thermal sensing Aerial spotting Whole fish­processing facilities on trawlers Methods ­Driftnets ­Long­line ­Trawling By­catch: catching things you do not want ­Certain fish, sharks, birds, marine, marine mammals, turtles  Driftnets Dolphins, seals, sea turtles Est. (1986) 133,000/dolphins (tuna by catch) Est. (2000) 2,000 year  Long­line: sea turtles, sharks, and sea birds (3,000/year) Trawling­ocean destruction (bottom) Result: Large scale depletion of fish  Changes in catch rates Dropped by 90% Oceans now contain about 10% of animals  Why don't we see this 
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