Enter your Name:   Enter your E-mail Address:  Define the following terms: 01a. Intertidal zone 01b. Sessile 01c. Desiccated 01d. Vertical zonation 01e. Ecological succession 02. What are the two major types of substrates in the intertidal zone? 03. Name one difficulty and one benefit of wave action for creatures living in the intertidal zone. 04. Name a strategy that a non-sessile intertidal organism must employ during high tide in order to avoid being thrashed about by the waves. 05. If a sessile organism cannot endure desiccation, how does it avoid desiccation in the upper intertidal area during low tide? 06. On a clear summer day, how will the temperature and salinity change in a tide pool during low tide? 07. Explain why a wave will bend, or refract, toward the shore if it approaches the shore at an angle. 08. If a beach has a canyon or sand bar offshore, will it have weak or strong wave action? 09. Why is space such an important factor to organisms in the intertidal? 10. Would salinity and temperature affect the upper or lower limits of living space for an intertidal organism? 11. In two sifferent intertidal locations, a scientist finds bands of mussels. He notices that one location has sea stars present, while the other does not. In which location would expect the band of mussels to be wider? 12. Once an intertidal area has reached a climax community, does this mean that no other organisms can ever move in? Why or why not? 13. Which zone of the rocky intertidal has the greatest diversity of organisms - the upper, middle, or lower intertidal? 14. What is the limiting resource of each of the three intertidal zones? 15. Which type of sediment allows water to move through more slowly - sand or mud? Why? 16. Why is zonation not noticeable in the muddy intertidal?