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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<ul><li><p>Lecture 7 ROCKY INTERTIDAL</p></li><li><p>RELATIVE TIDE LEVELS</p></li><li><p>RELATIVE TIDE LEVELS-EFFECT OF SLOPEMHWSMHWNMTLMLWNMLWSZONES CAN BE SEVERAL TENS OF METRESWIDEZONES CAN BE LESS THANA METRE WIDE</p></li><li><p>RELATIVE TIDE LEVELS-EFFECT OF SLOPE</p></li><li><p>Slope and SubstrateSSlopeSubstrate Size Wave ActionIf you know any two factors, you can determine the third.</p></li><li><p>Slope and SubstrateSteep slope Strong wave actionCoarse substrateWater drains at low tideGradual slope Weak wave actionFine substrateWater retained at low tide</p></li><li><p>Slope and SubstrateDecreasing sediment size</p></li><li><p>Slope and SubstrateHigh wave/ steep slope</p></li><li><p>Slope and SubstrateLow wave/ gentle slope</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal ShoresEHWSELWSInfralittoral Upper limit - LaminariaMytilusAscophyllumBarnaclesUpper limit - BarnaclesUpper limit - LittorinaInfralittoral fringeMidlittoral Supralittoral fringe Supralittoral After Stephenson &amp; Stephenson (1949)</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresa. Supralittoral ZoneXanthoria</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresb. Supralittoral Fringe CalothrixVerrucariaLittorina</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresb. Supralittoral Fringe Bottom of zone Fucus spiralisSemibalanus balanoides</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. Midlittoral- begins at upper limit of barnacles</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. Midlittoral4 dominant speciesSemibalanusbalanoides-northern rock barnacleAscophyllum nodosum - knotted wrack</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. Midlittoral4 dominant speciesMytilus edulis-blue musselFucus vesiculosus- bladder wrack</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralOther common speciesAcmaea-limpetLittorina littorea-periwinkle</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralOther common speciesThais-whelk</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralOn stalks of AscophyllumSertulariaFlustrellidraPolysiphonia</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresc. MidlittoralLower midlittoralPorphyraPalmaria</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresd. InfralittoralLaminaria- kelp</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresd. InfralittoralStrongylocentrotusdroebachiensisUlva</p></li><li><p>Stephenson and Stephenson Classification of Rocky Intertidal Shoresd. InfralittoralAsterias vulgaris</p></li><li><p>Critical Tide Levels(Doty, 1946. Ecology 27: 315-328 )Length of maximum submergenceTide levelCritical tide levels</p></li><li><p>(Doty, 1946. Ecology 27: 315-328 )Doty Algal distributions</p></li><li><p>Druehl &amp; Green, 1982. Mar.Ecol. Prog Ser. 9: 163 More realistic data on submergence</p></li><li><p>Druehl &amp; Green, 1982. Mar.Ecol. Prog Ser. 9: 163 </p></li><li><p>Next timeIntertidal Zonation Physical Factors</p></li></ul>