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You are an ecologist trying to determine whether a population of rare sea lions…

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Wize University Biology Textbook > Ecology

Introduction to Ecology

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You are an ecologist trying to determine whether a population of rare sea lions will be able to grow and reproduce now that humans have invaded their habitat.
You know the following information:
  • the ambient temperature is consistently at 12 ̊C
  • the sea lions take around an hour each day to find their food
  • sea lions eat around 5 kg of trout per day (trout has 10 kJ of energy per gram)
  • sea lions excrete all waste product in one go (500 g of waste at 10 kJ/g)
  • at rest (23 hours a day) the sea lion consumes 0.1kJ/g/hr while when actively looking for food expends 0.4 kJ/g/hr
  • the sea lion is 100 kg

How much energy would any given sea lion have to allocate to growth and reproduction?

More Introduction to Ecology Questions:
Which of the following explains why there are rarely more than five trophic levels in a food web?
Which of the following explains why there are rarely more than five trophic levels in a food web?
An organism that obtains energy and material from organic molecules is a:
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
An example of a consumer is:
Which of the following regarding secondary consumers is most true?
An organism that obtains energy and material from organic molecules is a:
What is the ultimate source of energy for an ecosystem?
Which of the following is the best explanation as to why the net primary productivity in terrestrial ecosystems tend to increase towards the tropics?
Keystone species have profound effects on the structure and composition of an ecosystem because:
Which of the following does not cycle in an ecosystem?
True or False.
In an ecosystem, the initiation of energy flow is when a producer acquires inorganic nutrients from the environment.
True or False.
Biomass is calculated as the number of organisms multiplied by their weight.
Ecosystems are dependent on which fundamental pathways?
True or False.
Decomposers break down detritus.
An ecosystem possesses:
Which order of the following ecosystems is listed by an increase in primary productivity?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases.
What can be said about the snake in this ecosystem?
Which trophic level has the largest biomass?
Considering what you know about the average transfer of energy between trophic levels, what amount of energy would reach the third trophic level in the primary producers contain 500 units of energy.
You find that while the species can all be connected via different food chains that some of them eat “similar” organisms. Because of this you decide to organize a food map into more discrete groups.
What are these new groups?
Fungi are responsible for breaking down dead organic matter. In an ecosystem, they are called:
An example of a consumer is:
You are interested in understanding how an ecosystem functions with respects to the producers and consumers.
What sort of map should you construct?
Which of the following explains why there are rarely more than five trophic levels in a food web?
The carrying capacity of an ecosystem is the same for all species that exist within it
You find that while the species can all be connected via different food chains that some of them eat "similar" organisms. Because of this you decide to organize the above map into more discrete groups. What are these new groups?
You are interested in understanding how an ecosystem functions with respects to the producers and consumers. What sort of map should you construct?
Which order of the following ecosystems is listed by an increase in primary productivity?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
Which trophic level has the largest biomass?
Which of the following explains why there are rarely more than five trophic levels in a food web?
Considering what you know about the average transfer of energy between trophic levels, what amount of energy would reach the third trophic level in the primary producers contain 500 units of energy.
Ecology Practice Problem 3
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
Levels of Diversity
What is the difference between the following levels of organization?
Community and Ecosystem
Which of the following definitions is incorrect?
How do decomposers fit into the trophic level pyramid?
Which of the following statements is correct?
The least amount of useful energy flowing through a food chain is available to the:
Ecosystems are dependent on which fundamental pathways?
Decomposers break down detritus.
An example of a consumer is:
An ecosystem possesses: