BC 2272 Ecology

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A collection of flashcards covering key concepts from the BC 2272 Ecology lecture notes.

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1
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What is the estimated population size of terrapins in Doboy Sound if 30 were marked and 5 out of 40 captured were recaptures?

The estimated population size of terrapins is 240.

2
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What is the intrinsic growth rate of cane toads mentioned in the lecture?

The intrinsic growth rate of cane toads is 2 cane toads/year.

3
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How do you calculate the future population size with an intrinsic growth rate of 2 cane toads/year starting from 10 cane toads over 3 years?

Using the formula Nt = N0 * e^(rt), the population becomes 4050 cane toads.

4
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What is the intrinsic growth rate of cane toads in Canada?

The intrinsic growth rate is 0.5.

5
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Will cane toads be able to establish a population in Canada given the intrinsic growth rate of 0.5?

Yes, because r > 0 indicates the population will increase.

6
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What is the carrying capacity of cane toads if the population is growing fastest when N = 400?

The carrying capacity (K) is 800.

7
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Which population exhibits unrestricted growth based on the data provided?

Population 1 exhibits unrestricted growth.

8
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What is the net reproductive rate (Ro) for the species mentioned in the life table?

The net reproductive rate (Ro) is 2.1.

9
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How many eggs will there be next year if 10 frogs each lay 100 eggs?

There will be 1000 eggs next year.

10
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What equation determines the population dynamics involving predator and prey isoclines?

dP/dt = 0 and dN/dt = 0 are the equilibrium equations for predator and prey populations.

11
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What is the competitive exclusion principle?

Two species cannot coexist indefinitely if they are both limited by the same resource.

12
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If two species compete for nitrogen with different R* values, which species will prevail?

Species 2, which has a lower R* value, should win out.

13
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What factors can affect the outcome of competition?

Harsh abiotic conditions, disturbances, and predation/herbivory can affect competition outcomes.

14
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What do we infer about non-native predators' impact on native prey?

Non-native predators can cause devastation because native prey have not evolved defenses against them.

15
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How will the equilibrium point change if a disturbance wipes out prey?

There will be no change in equilibrium but predator populations will cycle around the point; if prey are eliminated, predators will go extinct.

16
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What type of disease transmission does the flu involve?

Direct transmission (or direct horizontal transmission).

17
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What type of life cycle does the studied parasite exhibit?

A complex life cycle with horizontal transmission through multiple hosts.

18
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If an emerging disease has an R0 of 1.5, will it spread or die out?

It will spread.

19
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What is the proportion of the population that needs to be vaccinated to eradicate a disease with R0 = 1.5?

Approximately 32% of the population needs to be vaccinated.