Answers to Figure Legend Questions

FIGURE 14.6 It is likely that Asterionella would drive the third diatom species to extinction. Asterionella reduces the concentration of silica to about 1 μmol∕L when grown alone (see part B of this figure).

FIGURE 14.7 All of the interactions shown should be circled except the two on the ends (which represent amensalism, not competition) and the one in the middle (in which each competitor has an equal effect on the other).

FIGURE 14.9 Paramecium aurelia feeds mainly on floating bacteria, while P. bursaria feeds mainly on yeast cells. Because they rely on different food sources, it is likely that both species would persist if they were grown together.

FIGURE 14.14 The population size of species 2 would decrease to 1,000 because its abundance would be above its carrying capacity.

FIGURE 14.18 Two years. The observed replacement curve indicates that if a population begins with 100 individuals (in “year 0”), it will have about 22 individuals in the next year (year 1). A population that has 22 individuals in year 1 will have fewer than 10 individuals in year 2.