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Marine Ecology 3-18 - Marine Ecology Notes Intertidal...

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3/18/08 Marine Ecology Notes Intertidal Ecology I. Intertidal zone – where marine ecology really began o Happened because of the ease of access o Can observe and run experiments easily II. What defines this environment? What makes it unique? (i.e. why does it get its own chapter?) III. What challenges or constraints do the environmental conditions pose for the organisms living there? IV. How have they adapted? V. How do the environmental conditions affect interactions between organisms? VI. Two categories o Rocky and Sandy zones VII. Abiotic factors o What defines this environment? Tides Chance of desiccation o What makes it unique? o (i.e. why does it get its own chapter?) VIII. What is the intertidal zone? o The intertidal: between high & low water o Inhabited almost exclusively by marine organisms o Small in area, but well-studied IX. Environmental conditions o Environmental gradients: Wetness/dryness (tidal) Temperature Wave action Salinity X. Tides o The relative strength of gravitational vs. centrifugal forces between the eart and moon causes water on the earth to bulge outward o When the sun & moon are aligned, their gravitational forces augment one another XI. Tide frequency and magnitude o Influenced by:
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Latitude Moon’s position in orbit (apogee/perigee) Sun & moon alignment Basin morphology o Influences: Duration of air exposure Timing of exposure
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