Thursday February 21, 2013 (Oceanic Feeding Relationships)

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

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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