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Monday 2-10-2014. Starter: The Intertidal Zone is one of the oceanic zones we discussed last week. Where is it located and what are some of its properties?. Between the Tides 2/10/14. Intertidal Zones.

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monday 2 10 2014
Monday 2-10-2014
  • Starter: The Intertidal Zone is one of the oceanic zones we discussed last week. Where is it located and what are some of its properties?
intertidal zones
Intertidal Zones

Intertidal zone – narrow fringe along the shoreline that lies between the highest high tides and lowest low tides

intertidal zones1
Intertidal Zones

unique to marine environments because it is regularly exposed to air

animals in this zone must cope with both exposure to air and submersion in water

types of bottoms
Types of Bottoms
  • the nature of the community depends on the type of bottom of the intertidal zone

2 different types of habitat:

    • rocky shore
    • soft bottoms
rocky shore communities
Rocky Shore Communities

rocky shores generally occur in steep coasts without large amounts of sediment

rocky shore communities1
Rocky Shore Communities

more stable

living things in this area have places to attach

soft bottom communities
Soft Bottom Communities
  • any bottom that is composed of sediment, not rock
  • Occur where sediments accumulate
    • ex. near river mouths
soft bottom communities1
Soft bottom Communities
  • Unstable and constantly shift in response to waves, tides, and currents
  • No solid place for attachment

Water Loss

  • run and hide
    • ex. shore crabs, snails, hermit crabs
  • “clam up”
    • Ex. Barnacles, mussels
    • use mucus to get a better seal


  • run and hide
  • pronounced ridges on shells
    • help animal lose excess heat
  • color of shells
    • white, brown


  • “clam up”
    • during rain to keep out fresh water
  • Burrowing
    • reduce activity

Restriction of Feeding

  • hardest in rocky intertidal because little or no sediment
  • most in this zone are filter feeders
  • easier in soft bottom areas because lots of sediment
  • deposit feeders

Wave Shock

  • easier to cope with in soft bottom because sediment provides shelter
  • holdfasts to attach to rocks
  • byssal threads
  • suction cups
  • no swim bladders
    • help animals stick to bottom

Getting around

  • soft bottom animals usually burrow
    • muscular “foot” like mussels
    • segmented/soft body animals
  • rocky bottom animals
    • no soft bodied animals
    • hard outer shells
    • legs or swim using shell