Communities of Rocky Shores

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Communities of Rocky Shores

  1. 1. © 2011 Pearson Education, Inc.Communities on Rocky Shores Epifauna Attached to substrate (e.g., marinealgae) Move over seafloor (e.g., crabs, snails) Moderate diversity of species Greatest animal diversity at tropicallatitudes Greatest algae diversity at mid-latitudes
  2. 2. © 2011 Pearson Education, Inc.I. Intertidal Zonation (SprayZone & Tidal Zones) Rocky shore: Spray zone – abovespring tide zone Intertidal zone High tide zone Middle tide zone Low tide zone
  3. 3. © 2011 Pearson Education, Inc.a) Spray Zone Supratidal zone Organisms Avoid drying out Many animalshave shells Few species ofmarine algae
  4. 4. © 2011 Pearson Education, Inc.b) Intertidal Zone Organisms(Tidal Zones)1. High tide zone Animals have shells to avoiddrying out Marine algae—rock weedswith thick cell walls
  5. 5. © 2011 Pearson Education, Inc.Intertidal Zone Organisms2. Middle tide zone More types of marinealgae Soft-bodied animals(Barnacles)
  6. 6. © 2011 Pearson Education, Inc.Intertidal Zone Organisms3. Low tide zone Abundant algae Many animals hiddenby sea weed and seagrass Crabs abundant in allintertidal zones
  7. 7. © 2011 Pearson Education, Inc.2. Sandy Beach Organisms andAdaptations Burrowing animals No stable, fixed surface Burrowing provides morestable environment Less risk of temperatureextremes and drying out
  8. 8. © 2011 Pearson Education, Inc.Sandy Beach Organisms andAdaptations Bivalve mollusks Soft body, hard shell Example: clams andmussels Greatest number in lowtide regions
  9. 9. © 2011 Pearson Education, Inc.Sandy Beach Organisms andAdaptations Crustaceans Segmented body, hardexoskeleton, pairedjointed limbs Example: crabs,lobsters
  10. 10. © 2011 Pearson Education, Inc.Sandy Beach Organisms andAdaptations Echinoderms Spiny skin Five tapered legs Example: starfishand heart urchin
  11. 11. © 2011 Pearson Education, Inc.3. Mud Flats Eelgrass and turtlegrass common Bivalves and othermollusks Fiddler crabs
  12. 12. © 2011 Pearson Education, Inc.4. Shallow Offshore Ocean FloorCommunities Rocky bottoms(subtidal) Kelp and kelpforests Attaches to rockybottoms Can grow up to 0.6meters (2 feet) perday Productiveecosystems Provides shelter forother organisms
  13. 13. © 2011 Pearson Education, Inc.Kelp Distribution
  14. 14. © 2011 Pearson Education, Inc.5. Rocky Bottom Shallow OffshoreOcean Floor Communities Lobsters Large, spiny antennae Live in water deeperthan 20 meters(65 feet) Scavengers Also feed on liveanimals
  15. 15. © 2011 Pearson Education, Inc.Rocky Bottom Shallow Offshore OceanFloor Communities Oysters Sessile bivalvemollusks Thick shell Start life as plankton

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