Read each of the following passages. After each passage, choose the term that be

Question

Read each of the following passages. After each passage, choose the term that best completes the sentence.

2. Species' roles in ecosystems Aa Aa The following two graphs describe the types of prey eaten by two populations of sea otter (Enhydra lutris) in California. Each column corresponds to a different prey type, and the height of a column indicates the portion of the diet represented by that prey type Population A Population B 50 40 30 80 40 10 Data from M. T. Tinker, G. Bentall, . A. Estes. 2008. Food limitation leads to behavioral diversification and dietary specialization in sea otters. PNAS 105 (2): 560-565. Copyright 2008 National Academy of Sciences, U.S.A The two populations are similar, but one is slightly more of a specialist in its diet, whereas the other is more of a generalist. Which population is more of a specialist? O Population A O Population B

Explanation / Answer

In first case, S.vulgaris a Eurasian species is introduced to north America which drastically overpopulated.

Here the bird can be referred to as the non native species.

Option a is the answer

In second case, A.gerardii is used to measure the health and populations of tallgrass prairies.

This means the A.gerardii is used as indicator species.

Option a is the answer.

The species Cynomys ludovicianus is helping in maintaining biodiversity of the species in the special grassland ecosystem.

It is a keystone species.

Option c is the answer

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