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Lone Star College, CyFair *

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1409

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Geography

Date

Jan 9, 2024

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pdf

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2

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Lab RepoRt 17: ecoLogicaL communities: Keystone pRedatoR Group Names: ________________________ __________________________ ________________________ __________________________ Section 1: Rocky Intertidal Community Dynamics 1. This lab is based on a series of experiments conducted in what decade? ________ 2. This lab is based on a series of experiments conducted along the rocky shore of which U.S. state? _____________ 3. Fill in the following table from the “Who’s Who” information page. ORGANISM TYPE PRODUCER OR CONSUMER? FILTER FEEDER (Y/N) SESSILE OR MOBILE? Nori Seaweed Algae Black Pine Algae Coral Weed Algae Mussel Mollusk Acorn Barnacle Crustacean Gooseneck Barnacle Crustacean Whelk Mollusk Chiton Mollusk Starfish Echinoderm 4. A. Which species in the simulation has the largest population? ________________ B. What is the size of the population? __________________________ 5. A. Which species in the simulation has the smallest population? _______________ B. What is the size of the population? __________________________ 6. In competitive dominance hierarchies, the arrows point from a ___________ competitor to a ___________ competitor. Section 2: Ruling the Rock 7. Complete the following competitive dominance hierarchy by adding all of the correct arrows.
8. Which species of algae is the strongest competitor? ___________________________ 9. Which species overall is the strongest competitor? ____________________________ 10. List the prey items for the Whelk: _____________________________________________ 11. List the prey items for the Chiton: ____________________________________________ 12. List the prey items for the Starfish: ____________________________________________ 13. A food web uses arrows that point from ____________ species to ____________ species. 14. Complete the following food web by adding in the correct arrows. 15. Which removal had the greatest impact? _________________________________ 16. Who is the keystone species? _____________________________ 17. Why did almost all the species disappear (except mussels) after starfish were removed? ____________________________________________________________________________________________ __________________________________________________________________
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