Exploring the Coast with Hannah: The Four Zones of the Rocky Intertidal

Overview

• Focus: The four zones of the rocky intertidal found in Monterey Bay.
• Zones discussed: Splash Zone, High Zone, Mid Zone, Low Zone.
• Importance: Understanding these zones helps in studying rocky intertidal habitats and ecological health.

Zone 1: Splash Zone

• Characteristics:
  • Predominantly bare rock.
  • Highest tides, mostly storm tides, reach this area.
  • Minimal species due to harsh conditions.
• Species and Use:
  • Commonly used by birds for resting, hunting, and nesting.

Zone 2: High Zone

• Characteristics:
  • Exposed during high tides of the day.
  • Species are highly adapted to exposure to elements (sun, air).
• Species:
  • Scouring pad alga (indicator of high zone).
  • Barnacles, limpets, titans.

Zone 3: Mid Zone

• Characteristics:
  • Dominated by mussel beds.
  • Exposed to waves constantly; experience both high and low tides.
  • Shelled organisms adapted to long exposure and low oxygen.
• Species:
  • California mussel, turban snails, pink acorn barnacles.
  • Limpets, shore crabs, sea stars, purple sea urchins.
  • Giant green anemones, sunburst anemones.

Zone 4: Low Zone

• Characteristics:
  • Surf grass beds found here, providing diverse habitats.
  • Least exposed to elements compared to other zones.
• Species:
  • Iridescent algae, coral line algae, rock weeds.
  • Sunburst anemone.
• Note:
  • Rock weeds span mid to low zones and sometimes high zones.

Importance of Studying These Zones

• Distinct species and defined areas allow scientists to track ecosystem health and changes over time.
• Offers insights into the adaptations and survival strategies of species in harsh environments.

Conclusion

• Regular updates on exploring the coast with Hannah can be found every Tuesday on the museum’s website.
• Understanding the intertidal zones enhances appreciation and knowledge of marine biology and ecology.