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Rocky Intertidal Zone Community

Rocky Intertidal Zone Community. Intertidal Zone. Area of the shore between the highest high tide and lowest low tide. Mixed Semi-diurnal Tidal Regime. Two tides per day Tidal heights not equal. neap. spring. spring. Half. Full. Half. New. Zero datum. (MLLW). Position on Shore.

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Rocky Intertidal Zone Community

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  1. Rocky Intertidal Zone Community

  2. Intertidal Zone Area of the shore between the highest high tide and lowest low tide

  3. Mixed Semi-diurnal Tidal Regime Two tides per day Tidal heights not equal

  4. neap spring spring Half Full Half New Zero datum (MLLW)

  5. Position on Shore A B C

  6. Physical Factors Affecting DistributionsPhysical Tolerances • Temperature (average and extreme) • Moisture/Desiccation • Light • Gasses (respiration) • Wave shock • Sand scouring

  7. Biological FactorsBiological Interactions • Predation • Grazing • Competition • Symbioses

  8. Summary • Upper distributions of intertidal organisms tend to be determined by physical factors – tolerances • Lower distributions of intertidal organisms tend to be determined by biological interactions

  9. Intertidal Zonation

  10. Factors Affecting Height of the Intertidal Zone • Slope of the shore • Wave exposure • Local geomorphology • Tidal flux

  11. Behavioral Adaptations

  12. Morphological Adaptations • Color • Shells

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