Question

1a) annual grasses r introduced into California from Spain, which has a similar Mediterranean climate. The annual grasses populations increased and the perennial bunch grasses all but disappeared from much of their distribution. Which of the following statements about the annual grasses is true?

a) They are a weak competitor. b) Their fundamental niche has been reduced. c) Their fundamental niche has expanded. d) They have expanded their realized niche to be their fundamental niche. e) They have a commensal relationship with bunch grasses.

1b)Which of the following would explain the decline in California's bunch grasses?

a) Competitive exclusion b) Character displacement c) Demographic transition d) Convergent evolution e) Resource partitioning

Answer 1

Answer:

1)a):"d"( They have expanded their realized niche to be their fundamental niche. ):

• Realized niche refers to the niche used by the organism after competition or predation with other species.
• As the introduction of annual grasses lead to extinction of the local perennial grasses, we can infer that the annual grasses have expanded their realized niche to fundamental niche where only they can survive and this change restricted the growth of perennial grasses.

1)b):"a"( competitive exclusion ):

• decline in California native bunch grasses are due competitive exclusion by exotic annual grasses.

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