1. Continuing your studies, you perform a transplant experiment. You chisel up m
ID: 48004 • Letter: 1
Question
1. Continuing your studies, you perform a transplant experiment. You chisel up multiple rocks from the upper intertidal zone, each holding 10 individuals of Species A, and move them to the lower intertidal zone among individuals of Species C. You count the number of individuals of all species on the rocks every day for 30 days. Based on your findings, what can you conclude? (Remember that all 3 species settle in this zone at equal rates.)
Answer.... A
a. Species A and B lack the necessary adaptations to survive in the lower intertidal zone.
b. Species C likely outcompetes Species A and B in the lower intertidal zone.
c. Species A and B compete with one another for space in the lower intertidal zone, reducing the number of individuals of both species.
d. Species A outcompetes Species B in the lower intertidal zone.
2. Remember that Species B is more abundant than the other two species in the middle intertidal. Both Species A and B settle in that range at the same rate and both survive in that zone equally well when the other is excluded. You conduct a transplant experiment similar to that in question 8, transplanting multiple rocks, each with 10 individuals of Species A, into the middle intertidal zone. You count the number of individuals of each species present at the end of 30 days. Based on your findings below, what can you conclude?
Answer.... D
a. Species B outcompetes species A in the middle intertidal zone.
b. Species B has better adaptations to the physical environment of the middle intertidal zone than does Species A.
c. The presence of Species C in the samples means that no conclusions can be drawn.
d. Neither competition nor differences in adaptation to the physical environment alone explain the distributions of Species A and B.
Explanation / Answer
1. a. Species A and B lack the necessary adaptations to survive in the lower intertidal zone. Option a is correct.
2. b. Species B has better adaptations to the physical environment of the middle intertidal zone than does Species A.
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