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Analysis of Energy Flow Between Moose and Wolves

Based on the information in Table 1.2, here's a summary of the energy flow between moose and wolves, as investigated by Paul Colinvaux in the 1970s:

This table shows the energy consumed and respired by both moose and wolves in the ecosystem. The energy is measured in megajoules (MJ).

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Задание 1: Calculate the percentage of the energy obtained by the moose that is consumed by the wolves.

To calculate the percentage of energy obtained by the moose that is consumed by the wolves, we will use the following formula:

$\text{Percentage} = \frac{\text{Energy consumed by wolves}}{\text{Energy consumed by moose}} \times 100$

From the table:
- Energy consumed by moose = 4,320,000 MJ
- Energy consumed by wolves = 56,000 MJ

Plugging in the values:
$\text{Percentage} = \frac{56,000}{4,320,000} \times 100$

$\text{Percentage} = 0.01296 \times 100$

$\text{Percentage} \approx 1.30\%$

Answer: Approximately 1.30% of the energy obtained by the moose is consumed by the wolves.

Задание 2: Explain why the number of wolves on Isle Royale has never risen above 50 while the number of moose recorded is 2450.

The number of wolves on Isle Royale has never risen above 50 while the number of moose recorded is 2450 due to the energy flow and ecological dynamics between the two populations. Here's why:

1. Energy Transfer Efficiency: Only a small fraction of the energy consumed by moose is transferred to the wolves (as calculated in the previous question, approximately 1.30%). This is due to energy losses at each trophic level through respiration, heat, and waste.

2. Carrying Capacity: The carrying capacity of an environment is the maximum number of individuals of a species that the environment can support. The moose population is limited by the availability of vegetation, while the wolf population is limited by the availability of moose.

3. Predator-Prey Dynamics: The number of wolves is directly dependent on the number of moose available as prey. If the wolf population increases too much, they would deplete the moose population, leading to a crash in both populations.

4. Other Limiting Factors: Besides food availability, other factors such as disease, territory size, and social structure within the wolf packs can also limit the wolf population.

In summary, the energy transfer between trophic levels is inefficient, and the wolf population is limited by the availability of moose, leading to a relatively small wolf population compared to the moose population on Isle Royale.

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Задание 2: Explain why the number of wolves on Isle Royale has never risen above 50 while the number of moose recorded is 2450.

The wolf population is much smaller than the moose population on Isle Royale due to:

1. Inefficient Energy Transfer: Wolves receive only a small fraction (around 1.30%) of the energy initially consumed by moose.

2. Limited Resources: The number of wolves is limited by the availability of moose as prey.

3. Carrying Capacity: The environment can only support a certain number of wolves based on available resources.

Thus, energy loss at each trophic level and the limited availability of prey keep the wolf population much lower than the moose population.