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Coastal Ranges Coastline

Coastal Ranges Coastline. Chapter 12. California Coastline 1100 miles long!. Upwelling Brings Nutrients to Photic Zone. Coastline. Moderate maritime temperatures. Tides. Tidal cycle varies over day Extremes vary according to relative position of moon sun & earth Neap tide= puny

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Coastal Ranges Coastline

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  1. Coastal RangesCoastline Chapter 12

  2. California Coastline 1100 miles long!

  3. Upwelling Brings Nutrients to Photic Zone

  4. Coastline • Moderate maritime temperatures

  5. Tides • Tidal cycle varies over day • Extremes vary according to relative position of moon sun & earth • Neap tide= puny • Spring tide= excellent

  6. Tides • Influence of gravitational pull from Sun and Moon. Moon’s pull is stronger because it is closer. • Centrifugal force also important. • Spring tides (Upwelling) every two weeks or so • Sun’s pull adds to moon’s pull • Neap tides (Scarce) every two weeks or so. • Moon’s pull partially counteracts sun’s pull. • Sun’s influence changes with season, • closer in June and December stronger tides.

  7. Tides Result from Pull of moon and Centrifugal force

  8. Tidal Cycle • Approximately Every “day” (24 hrs. 48 mins.) has two high tides and two low tides. • One high tide is higher than the other: Hi-Hi • One low tide is lower: Lo-Lo • Daily Tidal cycle: • Hi-Hi; Lo-Lo; Hi-Lo; Lo-Hi repeat……. • tides change every 6 hrs. 12 mins. • full cycle in 24 hrs. 48 mins. (one Lunar orbit) • offset by about an hour per day

  9. Tidal Sequence Hi-Hi Lo-Hi Sea level Hi-Lo Lo-Lo

  10. Coastal Habitats • Rocky coastlines • Sandy beaches • Estuaries

  11. Hostile Environment Shifting substrate Changing water level Salinity Low productivity Sandy Beaches

  12. Particle Size

  13. Particle Size

  14. Pacific Mole Crab

  15. Sand Lice

  16. Rocky Intertidal • Hard coastal rock • Little weathering & erosion • High species richness • Harsh living conditions • High competition

  17. Rocky Intertidal

  18. Intertidal Community

  19. Intertidal life • Dessication • Salinity • Waveshock • Real estate • Light

  20. Dessication

  21. Salinity

  22. Waveshock

  23. Waveshock

  24. Real Estate

  25. “clone zone”

  26. Real Estate

  27. Light

  28. Light

  29. Spray Zone (1) • Aka spray zone, littoral zone, lichen zone • Dryest zone- “desert of intertidal” • Wet only during high tides • Semi-terrestrial animals • Isopod • Periwinkle Littorina sp • black lichen

  30. Spray Zone

  31. Littorina spp Periwinkle

  32. High Intertidal- Zone 2 Aka upper intertidal Covered during high tide Dry periods every day Characteristic species Brown turban snail Limpets Gooseneck barnacle

  33. High Intertidal- Zone 2

  34. Gooseneck Barnacle

  35. Tegula funebralis

  36. California Mussels Mytilus californianus

  37. Midtide Zone 3 • Regularly covered by water • Uncovered at low tides, covered at high tides • Chitons • Brown algae • Some pelvetia, lots more fucus, Egregia • Red Algae • Gigartina, Porphyra,

  38. Aggregating Anenome- Anthopleura elagantissima

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