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ROCKY INTERTIDAL

ROCKY INTERTIDAL. RELATIVE TIDE LEVELS. RELATIVE TIDE LEVELS. -EFFECT OF SLOPE. MHWS. MHWN. ZONES CAN BE LESS THAN A METRE WIDE. MTL. ZONES CAN BE SEVERAL TENS OF METRES WIDE. MLWN. MLWS. RELATIVE TIDE LEVELS. -EFFECT OF SLOPE. Slope and Substrate. S Slope. Substrate Size.

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ROCKY INTERTIDAL

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  1. ROCKY INTERTIDAL

  2. RELATIVE TIDE LEVELS

  3. RELATIVE TIDE LEVELS -EFFECT OF SLOPE MHWS MHWN ZONES CAN BE LESS THAN A METRE WIDE MTL ZONES CAN BE SEVERAL TENS OF METRES WIDE MLWN MLWS

  4. RELATIVE TIDE LEVELS -EFFECT OF SLOPE

  5. Slope and Substrate SSlope Substrate Size Wave Action

  6. Slope and Substrate Coarse substrate Strong wave action Water drains at low tide Steep slope Fine substrate Weak wave action Water retained at low tide Gradual slope

  7. Slope and Substrate

  8. Stephenson and Stephenson Classification of Rocky Intertidal Shores

  9. Stephenson and Stephenson Classification of Rocky Intertidal Shores a. Supralittoral Zone Xanthoria

  10. Stephenson and Stephenson Classification of Rocky Intertidal Shores b. Supralittoral Fringe Calothrix Verrucaria Littorina

  11. Stephenson and Stephenson Classification of Rocky Intertidal Shores b. Supralittoral Fringe Bottom of zone Fucus spiralis Semibalanus balanoides

  12. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral - begins at upper limit of barnacles

  13. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral 4 dominant species Semibalanus balanoides -northern rock barnacle Ascophyllum nodosum - knotted wrack

  14. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral 4 dominant species Mytilus edulis -blue mussel Fucus vesiculosus - bladder wrack

  15. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral Other common species Littorina littorea -periwinkle Acmaea -limpet

  16. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral Other common species Thais -whelk

  17. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral On stalks of Ascophyllum Sertularia Flustrellidra Polysiphonia

  18. Stephenson and Stephenson Classification of Rocky Intertidal Shores c. Midlittoral Lower midlittoral Porphyra Palmaria

  19. Stephenson and Stephenson Classification of Rocky Intertidal Shores d. Infralittoral Laminaria - kelp

  20. Stephenson and Stephenson Classification of Rocky Intertidal Shores d. Infralittoral Strongylocentrotus droebachiensis Ulva

  21. Stephenson and Stephenson Classification of Rocky Intertidal Shores d. Infralittoral Asterias vulgaris

  22. Critical Tide Levels (Doty, 1946)

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