lecture 7 rocky intertidal

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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. - PowerPoint PPT Presentation

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  • Lecture 7 ROCKY INTERTIDAL

  • RELATIVE TIDE LEVELS

  • RELATIVE TIDE LEVELS-EFFECT OF SLOPEMHWSMHWNMTLMLWNMLWSZONES CAN BE SEVERAL TENS OF METRESWIDEZONES CAN BE LESS THANA METRE WIDE

  • RELATIVE TIDE LEVELS-EFFECT OF SLOPE

  • Slope and SubstrateSSlopeSubstrate Size Wave ActionIf you know any two factors, you can determine the third.

  • Slope and SubstrateSteep slope Strong wave actionCoarse substrateWater drains at low tideGradual slope Weak wave actionFine substrateWater retained at low tide

  • Slope and SubstrateDecreasing sediment size

  • Slope and SubstrateHigh wave/ steep slope

  • Slope and SubstrateLow wave/ gentle slope

  • Stephenson and Stephenson Classification of Rocky Intertidal ShoresEHWSELWSInfralittoral Upper limit - LaminariaMytilusAscophyllumBarnaclesUpper limit - BarnaclesUpper limit - LittorinaInfralittoral fringeMidlittoral Supralittoral fringe Supralittoral After Stephenson & Stephenson (1949)

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresa. Supralittoral ZoneXanthoria

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresb. Supralittoral Fringe CalothrixVerrucariaLittorina

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresb. Supralittoral Fringe Bottom of zone Fucus spiralisSemibalanus balanoides

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. Midlittoral- begins at upper limit of barnacles

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. Midlittoral4 dominant speciesSemibalanusbalanoides-northern rock barnacleAscophyllum nodosum - knotted wrack

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. Midlittoral4 dominant speciesMytilus edulis-blue musselFucus vesiculosus- bladder wrack

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralOther common speciesAcmaea-limpetLittorina littorea-periwinkle

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralOther common speciesThais-whelk

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralOn stalks of AscophyllumSertulariaFlustrellidraPolysiphonia

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralLower midlittoralPorphyraPalmaria

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresd. InfralittoralLaminaria- kelp

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresd. InfralittoralStrongylocentrotusdroebachiensisUlva

  • Stephenson and Stephenson Classification of Rocky Intertidal Shoresd. InfralittoralAsterias vulgaris

  • Critical Tide Levels(Doty, 1946. Ecology 27: 315-328 )Length of maximum submergenceTide levelCritical tide levels

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

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

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

  • Next timeIntertidal Zonation Physical Factors

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