Alligators excavate holes in the bottom of bodies of water. During times of severe drought these holes act as refugia for various aquatic organisms that might perish if there were no water available. Thus, alligators in this system can be classified as a(n)
A. symbiotic species.
B. refugistic species.
C. sympatric species.
D. keystone species.
E. allopatric species.
Answer: D
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Realized niches are larger than fundamental niches
Indicate whether the statement is true or false.
A J-shaped growth curve is converted to an Sshaped
one
a. when the parents are past reproductive age. b. if the data is plotted in reverse. c. when the carrying capacity is reached. d. if reproduction is stopped. e. only for fast-growing populations such as bacteria.
Secondary succession occurs
a. after a fire. b. on a new sand dune. c. on bare rock. d. immediately after the formation of a man-made lake. e. on a newly-formed volcanic island.
The elaborate courtship rituals of many bird species help to preserve their genetic isolation through
A) behavioral isolation. B) hybrid inviability. C) allopatric separation. D) temporal isolation. E) mechanical incompatibility.