Module 9: Intertidal Zone Part 2

Last week we looked at rocky intertidal zones.  This week we will examine the sandy and Muddy intertidal zones.  They have no Rocks! These soft-bottom areas are in protected stretches of coastline or in areas where loose sediments have accumulated over time.

Soft bottom ecosystems are  identified when the sediments are so loose that organisms can burrow into them. When the excess sediments accumulate, the wave action is usually not too severe; therefore different organisms inhabit these communities as compared to the organisms of the rocky intertidal. A community such as this is influenced by two major parameters:

  1.  Water movement
  2.  Sediment size and type

The substrate of a soft-bottom ecosystem is often unstable and is deposited based upon the amount of waves and currents that push it around.  Grains of quartz, volcanic sand and tiny bits of animal skeletons can all make up a soft-bottom community.

PowerPoint  Honors Marine Biology Module 9 Intertidal Zone Part 2 January 24, 2013


  1. Take Module 9 Test
  2. Read Module 10 to page 247
  3. OYO questions 10.1 to 10.4
  4. Study Guide a-d   and 2 – 15
  5. Quiz on Sandy Bottom Intertidal Zone
  6. Class Challenge:  Share your favorite Magic Trick

Have a good week! -Mrs. S


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