Ussel defenses induced by the presence of crabs? Hypothesis: Mussels increase investment in defense in the presence of crabs Null hypothesis: Mussels do not increase investment in defense in the presence of crabs Experimental setup: Seawater No crab Crab (fed fish, not mussels) Mussels Mussels Prediction: Mussels downstream of the crab tank will have thicker shells than mussels downstream of the empty tank. Prediction of null hypothesis: Mussels in the two tanks will have shells of equal thickness Results: 0.6 04- 02 00 No crab Crab What conclusion can you draw from the figure above? O Without direct contact, mussels can sense the presence of crabs. O Mussels can sense the presence of crabs only visually. O Mussels are increasing their shell thickness O Shell thickness is a non-inducible defense. O Crabs hunt for mussels by focusing on the chemicals they emit into the water. response to water current. Shell thickness Imm)

Biology Today and Tomorrow without Physiology (MindTap Course List)
5th Edition
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Author:Cecie Starr, Christine Evers, Lisa Starr
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Chapter15: Animal Evolution
Section: Chapter Questions
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mussel defenses induced by the presence of
crabs?
Hypothesis: Mussels increase investment in defense in the presence of
crabs
Null hypothesis: Mussels do not increase investment in defense in
the presence of crabs
Experimental setup:
Seawater
No crab
Crab
(fed fish, not mussels)
Mussels
Mussels
Prediction: Mussels downstream of the crab tank will have thicker
shells than mussels downstream of the empty tank.
Prediction of null hypothesis: Mussels in the two tanks
will have shells of equal thickness
Results:
0.6-
0.4-
0.2
00
No crab
Crab
What conclusion can you draw from the figure above?
Without direct contact, mussels can sense the presence of crabs.
O Mussels can sense the presence of crabs only visually.
O Mussels are increasing their shell thickness in response to water current.
Shell thickness is a non-inducible defense.
O Crabs hunt for mussels by focusing on the chemicals they emit into the water.
Shell thickness lmm)
Transcribed Image Text:mussel defenses induced by the presence of crabs? Hypothesis: Mussels increase investment in defense in the presence of crabs Null hypothesis: Mussels do not increase investment in defense in the presence of crabs Experimental setup: Seawater No crab Crab (fed fish, not mussels) Mussels Mussels Prediction: Mussels downstream of the crab tank will have thicker shells than mussels downstream of the empty tank. Prediction of null hypothesis: Mussels in the two tanks will have shells of equal thickness Results: 0.6- 0.4- 0.2 00 No crab Crab What conclusion can you draw from the figure above? Without direct contact, mussels can sense the presence of crabs. O Mussels can sense the presence of crabs only visually. O Mussels are increasing their shell thickness in response to water current. Shell thickness is a non-inducible defense. O Crabs hunt for mussels by focusing on the chemicals they emit into the water. Shell thickness lmm)
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