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TuesdayMarch 6, 2012
(Marine Life Zones; Ocean Productivity)
The Launch PadTuesday, 3/6/12
Name and briefly describe the three classifications of marine organisms.
Plankton (floaters) include all marine organisms that drift with ocean currents.
Nekton (swimmers) include all animals capable of moving independently of the ocean currents, by swimming or other means
of propulsion.
Benthos (bottom dwellers) describe organisms living on or in the ocean bottom.
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WS – Igneous Rocks (Part 1) F 2/9 2/13
WS – Sedimentary Rocks (Part 1) F 2/15 2/17
Quiz 20 S1 2/17 2/17 2/24 3/9Lab – Metamorphic
RocksF 2/22 2/22
Video Quiz - Oceans – Earth’s
Last Frontier F 2/23 2/23
Quiz 21 S2 2/24 2/24 2/24 3/9
TELPAS Writing Sample F 2/28 2/28 3/1 3/7
Quiz 22 S3 3/2 3/2
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Marine Life Zones
Marine Life Zones
Oceanic ProductivitySome regions of the oceans are teeming with life, while other
areas seem barren.The reason for this is related to
the amount of primary productivity in various parts of
the oceans.Primary productivity is the amount of carbon fixed by
organisms through the synthesis of organic matter using energy
derived from solar radiation (photosynthesis) or chemical reactions (chemosynthesis.)
Oceanic ProductivityTwo factors influence a region’s photosynthetic
productivity:the availability of
nutrients the amount of solar
radiation The most abundant
marine life exists where there is a plentiful supply of nutrients and sunlight.
Oceanic ProductivityPrimary ocean productivity is the
production of organic compounds from atmospheric or aquatic carbon dioxide,
principally through the process of photosynthesis.
Almost all life on earth is directly or indirectly reliant on primary production.
The organisms responsible for primary production are known as primary
producers or autotrophs, and form the base of the food chain.
In the oceans, photosynthetic phytoplankton are primarily
responsible for primary production.
At the base of the ocean food web are single-celled algae and other plant-like organisms known as phytoplankton. Like plants on land, phytoplankton use chlorophyll and other light-harvesting pigments to carry out photosynthesis, absorbing atmospheric carbon dioxide to
produce sugars for fuel. Chlorophyll in the water changes the way it reflects and absorbs sunlight, allowing scientists to map the amount and location of phytoplankton. These
measurements give scientists valuable insights into the health of the ocean environment, and help scientists study the ocean carbon cycle.
Oceanic ProductivityProductivity in Polar Oceans
Because of nutrients rising from deeper water, high-latitude surface waters
have high nutrient concentrations.
However, low solar energy limits photosynthetic
productivity.
Report on Jacques Cousteau and the Calypso