Ecology 5th Edition by Manuel Molles

Exercise 15

Of the three populations pictured in figures 10.19, 10.20, and 10.21, which is most likely to have a stable age distribution?
Figure 10.19 The age distribution of a white oak, Quercus alba, population in Illinois (data from Miller 1923).
Figure 10.20 Age distribution of a population of Rio Grande cottonwoods, Populus deltoides subsp. wislizenii, near Belen, New Mexico (data from Howe and Knopf 1991).
Figure 10.21 Age distribution of a population of large cactus finches, Geospiza conirostris, on the island of Genovesa in the Galápagos Islands during 1983 ( a ) and 1987 ( b ) (data from Grant and Grant 1989).