Exam 43: Ecological and Evolutionary Consequences of Interactions Within and Among Species

Tree sloths feed on leaves and buds,which are digested by bacteria that inhabit the sloth's large stomach.While in a tree,the sloth is difficult for predators to find because it is tinted green from the cyanobacteria that live in its fur.A variety of nonbiting insects also live in the fur,but they appear to have no effect on the sloth.Based on this information,one can say that the sloth has mutualistic interactions with the _______ and the _______.

Which activity could be an example of restoration ecology?

Which of the following is a primary consumer?

In a food web with energy flowing up,a(n)_______ is one trophic level above a primary consumer.

Use the following to answer questions : Below are results from a hypothetical study of intraspecific and interspecific competition of two species of yeast.In the intraspecific treatment,populations of a single species at different densities are assayed for their growth rates.In the interspecific treatment,a small number of one species (the focal species)is exposed to varying densities of the other species,and the growth rates of the focal species are surveyed. -Using the data presented in these graphs,estimate the effect of intraspecific and interspecific competition on both species.Note that the scales for each graph may be different.Based on this information,briefly explain why or why not these species can coexist.

The passionflower plant has developed leaf structures that look like a butterfly's egg because these structures

The reintroduction of _______ into Yellowstone in 1995 caused a decrease in the population of elk,which in turn enabled aspen and willow seedlings to become reestablished.

Which statement about interspecific competition is false?

The field of ________ ecology provides scientific guidance for bringing back lost elements or functions of an ecosystem.

Which of the following is most likely to be eaten by a secondary consumer?

Which relationship is not a consumer-resource interaction?

Use the following to answer questions : In Joseph Connell's experiments with barnacles in the intertidal zone,he removed two species from their usual zones (stellate barnacles on the upper levels,rock barnacles on the lower levels)and observed the response of the other species.The results showed that stellate barnacles thrived on both levels in the absence of rock barnacles,whereas the rock barnacles remained only on the lower levels. -The distribution of stellate barnacles is restricted by

Where or when would you most likely see mutualistic relationships between plants and mycorrhizal fungi?

Which statement about mutualisms is true?