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Lecture 7 ROCKY INTERTIDAL

Lecture 7 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.

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Lecture 7 ROCKY INTERTIDAL

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  1. Lecture 7 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 If you know any two factors, you can determine the third.

  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 Decreasing sediment size

  8. Slope and Substrate High wave/ steep slope

  9. Slope and Substrate Low wave/ gentle slope

  10. Stephenson and Stephenson Classification of Rocky Intertidal Shores Supralittoral Upper limit - Littorina EHWS Supralittoral fringe Upper limit - Barnacles Barnacles Ascophyllum Midlittoral Mytilus Upper limit - Laminaria Infralittoral fringe ELWS Infralittoral After Stephenson & Stephenson (1949)

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

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

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

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

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

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

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

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

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

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

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

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

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

  24. Critical Tide Levels Critical tide levels Tide level Length of maximum submergence (Doty, 1946. Ecology 27: 315-328 )

  25. Doty – Algal distributions (Doty, 1946. Ecology 27: 315-328 )

  26. More realistic data on submergence Druehl & Green, 1982. Mar.Ecol. Prog Ser. 9: 163

  27. Druehl & Green, 1982. Mar.Ecol. Prog Ser. 9: 163

  28. Next time Intertidal Zonation – Physical Factors

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