thursday february 21, 2013 (oceanic feeding relationships)
TRANSCRIPT
ThursdayFebruary 21, 2013
(Oceanic Feeding Relationships)
The Launch PadThursday, 2/21/13
What are the three ways that life can be separated into zones in the ocean?
the amount of sunlight available
the distance from the shore
the water depth
Announcements
Happy Introduce a Girl to Engineering Day!
Announcements
I will not be available after school today.
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
WS – Marine Life Zones and Ocean
ProductivityF17 2/20 2/21 ? 3/1
Recent Events in ScienceJurassic Records Warn of Risk to Marine Life from Global Warming
Read All About It!www.sciencedaily.com/releases/2013/02/130219140508.htm
The risk posed by global warming and rising ocean temperatures to the future health of
the world's marine ecosystem has been highlighted by scientists studying fossil
records.Researchers at Plymouth University believe that findings from fieldwork along the North
Yorkshire coast reveal strong parallels between the Early Jurassic era of 180 million years ago and current climate
predictions over the next century.Through geology and paleontology, they've shown how higher temperatures and lower oxygen levels caused drastic changes to marine communities, and that while the
Jurassic seas eventually recovered from the effects of global warming, the marine
ecosystems that returned were noticeably different from before.
Oceanic Feeding Relationships The main oceanic
producers are marine algae (i.e. seaweed), plants, bacteria, and bacteria-like archaea (chemosynthetic).
Only a small percentage of the energy taken in
at any level is passed on to the next level.
Oceanic Feeding Relationships Chemical energy stored in
the mass of the ocean’s algae is transferred to the animal community mostly
through feeding.Each feeding stage is called a trophic level.
Transfer of energy between trophic levels is very inefficient (about 2
percent.)
Ecosystem Energy Flow and Efficiency
Figure 14.18
Oceanic Feeding Relationships A food chain is a sequence
of organisms through which energy is
transferred. A food web involves
feeding on a number of different animals.
Animals that feed through a food web rather than a food chain are more likely
to survive.
Comparison Between a Food Chain and a Food Web
Figure 14.19
Worksheet
Figure 14.19
Oceanic Feeding Relationships