Prior Knowledge Questions (Do these BEFORE
using the Gizmo.)
1. Look at the graph to the right. What does it show?
it shows a decrease in coral reefs % over time
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2. Why do you think corals have declined since 1977?
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They have decreased because the conditions, fishing, land use, and invasive species.
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Gizmo Warm-up
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Coral reefs are some of the most diverse habitats on
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Earth, home to over a quarter of all marine species. The
Coral Reefs Gizmo™ provides a simplified model of
interactions among 10 key species in Caribbean reefs. In
the Coral Reefs 1 exploration, you will focus on the effects
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of environmental factors on Caribbean reefs.
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1. Click Advance year 10 times. Look carefully at the composition of the reef over time. Do
you see any major changes?
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no, not reely i see th same fish/turtle.
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2. Select the DATA tab. Check that Staghorn coral, Star coral, Sponges, and Algae are
selected. Populations are given as a percentage of normal populations.
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Click Advance year 15 times. What do you notice about these populations?
They are staying the same
3. On the right side of the Gizmo, select the SUMMARY tab. In a healthy reef, what are the
values for Nutrient load, Water clarity, Coral cover, and the total number of fish species?
4ppt, 94% water clarity, 49% coral cover
This study source was downloaded by 100000823518935 from CourseHero.com on 08-16-2021 20:23:52 GMT -05:00
, Nutrient load: Water clarity: Coral cover: Total fish species:
Get the Gizmo ready:
Activity A:
● On the CONDITIONS tab, click Return to original
The Caribbean
settings. Click Restart.
reef ecosystem
● Select the CORAL REEF tab.
Introduction: A healthy Caribbean reef is home to over 50 species of coral and over 400 fish
species. In this simplified model, we only consider the interactions of ten important species.
Question: How do different species interact in a healthy coral reef?
1. Describe: On the CORAL REEF tab, click on each organism shown in the table below. For
each organism, give its name and what it eats (or how it obtains energy).
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Picture Name What it eats (or how it obtains energy)
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staghorn coral by photosynthesis
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boulder star coral by photosynthesis
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sponges consume plankton
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Algea Photosynthesis
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stop light algea and coral
queen angelfish sponges
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yellowtail snapper young fish, shrimp, crabs, worms.
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Nassua Grouper Reef Fish
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long spined sea urchine alge
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hawksbill sea turtle sponges
This study source was downloaded by 100000823518935 from CourseHero.com on 08-16-2021 20:23:52 GMT -05:00
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