wednesday february 20, 2013 (marine life zones and ocean productivity)
TRANSCRIPT
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WednesdayFebruary 20, 2013
(Marine Life Zones and Ocean
Productivity)
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The Launch PadWednesday, 3/20/13
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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AnnouncementsHappy National Love Your
Pet Day!
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AnnouncementsI will be available after
school today until 5:15.
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Assignment Currently Open
Summative or
Formative?Date Issued Date Due Date Into
GradeSpeedFinal Day
Quiz 18 S3 2/8 2/8 2/11 2/25
WS – Ocean Temperature and
DensityF15 2/13 2/15 ? FRIDAY
Quiz 19 S4 2/15 2/15 ? 3/1
WS – Ocean Life F16 2/19 2/20 ? FRIDAY
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Science on the International Space Station – Gateway to the Universe
Recent Events in Science
Read All About It!www.nasa.gov/connect/social/social_ISSscience_feb2013.html
On Wednesday Feb. 20, 150 of NASA's social media followers and their guests will have the unique
opportunity to talk to three of the six crew members aboard the International Space Station, and speak with agency scientists and engineers about the ground-breaking research taking place daily on the orbiting laboratory, some 240 miles above Earth. The space station is the gateway to
the rest of the universe, enabling important discoveries that benefit humanity and vastly
increase our understanding of how humans can safely work, live and thrive in space for long
periods. The day-long event will take place in two parts, with the morning at NASA Headquarters, 300 E St. SW in
Washington. A portion of the morning will be broadcast on NASA TV from 10:00 a.m. to noon
EST.In the afternoon, NASA has partnered with the
Smithsonian’s National Air and Space Museum (@airandspace) so participants will take
part in a special tour of the museum and have opportunities to interact with museum experts.
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Science on the International Space Station – Gateway to the Universe
Recent Events in Science
Read All About It!www.nasa.gov/connect/social/social_ISSscience_feb2013.html
Participants will have the opportunity to:Engage in a live chat with NASA astronauts Kevin Ford and
Tom Marshburn, and Canadian Space Agency astronaut Chris Hadfield, currently aboard the space station. Speak
with NASA astronaut Don Pettit, @Astro_Pettit, and agency scientists and engineers. Tour the NASA Headquarters
Space Operations Center with live views from the International Space Station. Learn about:
Current scientific experiments underway aboard the space station and new experiments planned to launch on the next SpaceX cargo resupply mission in March.Commercial and educational research opportunities enabled by the station's microgravity environment.How researchers study the effects of a weightless environment on the human body to help protect
astronauts for long-duration spaceflight missions in the future.
How the space station is being used to test groundbreaking, new technologies that will help
astronauts safely reach new deep space destinations, including an asteroid and eventually Mars.
Registration for the event will open from
9:00 a.m. EDT, Tuesday, Feb. 5 until 5:00 p.m.
EST on Thursday, Feb. 7. NASA will randomly select 150 participants from the registrants. Additional applicants
will be placed on a waiting list.
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Marine Life Zones
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Basis: Available Light – The Photic Zone
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Basis: Available Light – The Euphotic Subdivision
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Basis: Available Light – The Aphotic Zone
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Basis: Distance From Shore – The Intertidal Zone
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Basis: Distance From Shore – The Neritic Zone
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Basis: Distance From Shore – The Oceanic Zone
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Basis: Depth – The Pelagic Zone
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Basis: Depth – The Benthic Zone
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Basis: Depth – The Abyssal Subdivision
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Marine Life Zones
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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.)
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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.
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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.
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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.
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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.
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An Example of Productivity in Polar Oceans (the Barents Sea)
Figure 14.13
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Oceanic ProductivityProductivity in Tropical Oceans
Productivity is low in tropical open oceans, because the thermocline eliminates the
supply of nutrients from deeper waters below.
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Productivity in Tropical Oceans
Figure 14.14
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Oceanic ProductivityProductivity in Temperate Oceans
Productivity in temperate oceans is seasonal.
In Winter, productivity is low because days are short and the sun angle is low.
In Spring, the “bloom” of phytoplankton is quickly depleted and productivity is
limited.In Summer, a strong thermocline
develops so surface nutrients are not replaced from below. The phytoplankton
population remains relatively low In Fall, the thermocline breaks down and
nutrients return to the surface. There is a short-lived Fall bloom of
phytoplankton. Generally speaking the highest overall
productivity occurs in temperate regions.
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Productivity in temperate oceans – Northern Hemisphere
Figure 14.15
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Worksheet
Figure 14.15
Marine Life Zones and Ocean Productivity