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radanta mmoved odunta not amoved 40 20- Oct 74 May 75 Sep 75 May 76 Samping Purtods Aug 76 Jul 77 Ants Rodants (-) Large soods Small soods -(+) Indract posiva aftact . Figure 56.22 Diroct and Indiroct offects in an ocological community. a. In the enclosums in which rodents had been emoved, ants inilially increaed in populalion sire elative lo the ants in the control enciosures, but then thege ant populations declined. 6. Rodents and ants both eat seeds, so the pesence ol rodents has a direct negative ellect on ants, and vice versa. However, the pesence of rodents has a negative effect on large seeds. In turm, the number of plants with large seds has a negalive efect on plants that produce small seds, which the ants eat. Hence, the presence of rodents should incease the number of small seeds. In turn, the number of small seeds has a posilive efect on ant populations. Thus, indinectly, the presence of rodents has a postive efect on ant population size Number of AntCobnie

radanta mmoved odunta not amoved 40 20- Oct 74 May 75 Sep 75 May 76 Samping Purtods Aug 76 Jul 77 Ants Rodants (-) Large soods Small soods -(+) Indract posiva aftact . Figure 56.22 Diroct and Indiroct offects in an ocological community. a. In the enclosums in which rodents had been emoved, ants inilially increaed in populalion sire elative lo the ants in the control enciosures, but then thege ant populations declined. 6. Rodents and ants both eat seeds, so the pesence ol rodents has a direct negative ellect on ants, and vice versa. However, the pesence of rodents has a negative effect on large seeds. In turm, the number of plants with large seds has a negalive efect on plants that produce small seds, which the ants eat. Hence, the presence of rodents should incease the number of small seeds. In turn, the number of small seeds has a posilive efect on ant populations. Thus, indinectly, the presence of rodents has a postive efect on ant population size Number of AntCobnie

Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN:9781305073951
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter21: Protists- The Simplest Eukaryotes
Section: Chapter Questions
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Refer to figure 56.22. Are there alternative hypotheses that might explain the increase followed by the decrease in ant colony numbers subsequent to rodent removal in the experiment described in figure 56.22? If so, how would you test the mechanism hypothesized in the figure?

radanta mmoved odunta not amoved 40 20- Oct 74 May 75 Sep 75 May 76 Samping Purtods Aug 76 Jul 77 Ants Rodants (-) Large soods Small soods -(+) Indract posiva aftact . Figure 56.22 Diroct and Indiroct offects in an ocological community. a. In the enclosums in which rodents had been emoved, ants inilially increaed in populalion sire elative lo the ants in the control enciosures, but then thege ant populations declined. 6. Rodents and ants both eat seeds, so the pesence ol rodents has a direct negative ellect on ants, and vice versa. However, the pesence of rodents has a negative effect on large seeds. In turm, the number of plants with large seds has a negalive efect on plants that produce small seds, which the ants eat. Hence, the presence of rodents should incease the number of small seeds. In turn, the number of small seeds has a posilive efect on ant populations. Thus, indinectly, the presence of rodents has a postive efect on ant population size Number of AntCobnie
Transcribed Image Text:radanta mmoved odunta not amoved 40 20- Oct 74 May 75 Sep 75 May 76 Samping Purtods Aug 76 Jul 77 Ants Rodants (-) Large soods Small soods -(+) Indract posiva aftact . Figure 56.22 Diroct and Indiroct offects in an ocological community. a. In the enclosums in which rodents had been emoved, ants inilially increaed in populalion sire elative lo the ants in the control enciosures, but then thege ant populations declined. 6. Rodents and ants both eat seeds, so the pesence ol rodents has a direct negative ellect on ants, and vice versa. However, the pesence of rodents has a negative effect on large seeds. In turm, the number of plants with large seds has a negalive efect on plants that produce small seds, which the ants eat. Hence, the presence of rodents should incease the number of small seeds. In turn, the number of small seeds has a posilive efect on ant populations. Thus, indinectly, the presence of rodents has a postive efect on ant population size Number of AntCobnie
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