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Examen

Week 5 Online HW - IB 150 With Complete Solutions Latest Update

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Week 5 Online HW - IB 150 With Complete Solutions Latest Update

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  • 27 de octubre de 2024
  • 5
  • 2024/2025
  • Examen
  • Preguntas y respuestas
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Schoolflix
Solution 2024/2025
Pepper

Week 5 Online HW - IB 150 With Complete
Solutions Latest Update

Which of these are possible reasons why the impact of the outdoor cat
population on the longterm viability of songbird populations is likely worse
than the impact of native, wild predators of birds? ANS✔✔ Native predator
populations will fluctuate with prey abundance, reducing predation pressure
when prey populations become smaller; outdoor house cats maintain a
much larger population size than if they relied solely on birds as prey, and
their population does not decline regardless of the size of their prey
populations due to feeding by owners.



Elk and bison are both herbivores and engage in exploitation resource
competition. Which of the following could be explanations (reason
hypotheses) as to why both species persist in Yellowstone rather than one
of the two species being extirpated due to competitive exclusion? ANS✔✔ -
Their fundamental niches do not completely overlap.



- Both species are kept well below their carrying capacities by predators.



Which of the following observations would be consistent with the hypothesis
that badgers engage in prey switching between mice and voles? ANS✔✔ -
Mice have a more stable population size (N) through time when they coexist
with voles than in the absence of voles.



- Voles have a more stable population size (N) through time when they
coexist with mice than in the absence of mice.

, Solution 2024/2025
Pepper
- Badgers have a more stable population size (N) through time when they
coexist with both mice and voles, rather than with only one of the two
species.



Look at graph for population growth data for elk and wolves in Yellowstone
national park between 1983 and 2015.



→ carrying capacity of elk in absence of predation:

→ years with highest r for wolves:

→ years with negative r for wolves:

→ years with lowest K for wolves:

→ years with r= for wolves:

→ years with d>b for wolves:

→ years with d = b for wolves:

→ years with b > d for wolves:

→ best time period to estimate rmax for wolves: ANS✔✔ → carrying
capacity of elk in absence of predation: ~15,000

→ years with highest r for wolves: 1995-2000

→ years with negative r for wolves: 2005-2010

→ years with lowest K for wolves: 2010-2015

→ years with r= for wolves: 2010-2015

→ years with d>b for wolves: 2005-2010

→ years with d = b for wolves: 2010-2015

→ years with b > d for wolves: 1995-2005

→ best time period to estimate rmax for wolves: 1995-2000

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