QoD – Notes AllowedIn your science notebook:

1) Freshwater coming in from rivers and precipitation causes slightly ________ salinity in seawater (choose “higher” or “lower”)

2) In the open ocean, _______ is more important in determining density—Near shore the _______is a more important factor in density determination

3) What is a thermocline?

Finishing “Comparing Salinity Lab”Turn to the page in your notebook from the

“Comparing Salinity Lab” (May 2, 2011)Make sure you have written the “Purpose” of

the lab: ‘What is the salinity of Puget Sound at two locations?’

Make sure you have written a hypothesis: “I think that the salinity will be higher in Sample ______ (A or B)”See Google Earth and consider what

factors can affect salinity

Finishing “Comparing Salinity Lab”Measure the mass of your salts and calculate

salinityWrite a several sentence conclusion:

Re-state the purpose of the lab Re-state your hypothesis Summarize the method you used to calculate

salinitySay whether or not your hypothesis was correctSay why you think your hypothesis was correct

or not

Draw salt crystals at 4x, 10x, and 40x using the light microscopes

Finishing “Comparing Salinity Lab”

Cleanup:Please help me clean up after the lab:

Completely rinse your Petri dishes and lay them upside-down to dry near the “Estuaries” poster sink

Wipe down countertops etc.Carefully put away microscopes (two

hands!)

Finishing “Comparing Salinity Lab”

Layers of the OceanIII. Three Major Zones: Shallow Mixed (Surface),

Transition Zone, Deep Zone

A. Shallow Mixed: Surface H2O has a uniform temp and usually extends to 300m.

B. Transition Zone: Temperature falls abruptly creating a thermocline, accounts for 18% of all the sea

C. Deep Zone: Temperature is a few degrees above freezing and initiates deep

ocean currents.

Marine Organisms--15.2IV. Types of Organisms:

A. Plankton: These organisms are drifters* and include phytoplankton and zooplankton.

1. Phytoplankton: Consist mostly of unicellular algae that are photosynthetic.

a. But also includes Diatoms (main primary producers) and

Dinoflagellates (can cause red tide)

*Some are capable of independent movement but not very much!

Diatoms

Marine Organisms--15.22. Zooplankton: Consist of herbivores grazing

on phytoplankton or carnivores eating other zooplankton (e.g. krill, copepods and jellyfish)

B. Nekton: Includes all animals that are capable of moving against the current.

1. Includes all fish, marine mammals & reptiles, squid and shrimp are

only invertebrate nekton.

C. Benthos: Organisms that inhabit the bottom of the ocean.

1. Includes all organisms that live on the bottom both in shallow and deep water.

Life Zone AreasV. Three Factors that Affect Distribution of Life: Light

Penetration, Distance from Shore and DepthA. Light Penetration: Photic Zone - is affected

by sediment (turbidity), plankton, and decaying organic particles.

1. Euphotic: Where photosynthesis occurs up to a max depth of 300ft

2. Aphotic: There is not enough light for photosynthesis, but marine animals use this

area to avoid predators.