IB Environmental systems and societies Topic 4.3C Maximum Sustainable Yield Revision Notes (SL/HL)

IB Environmental systems and societies Topic 4.3C Maximum Sustainable Yield Revision Notes (SL/HL) | RevisionDojo

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Maximum Sustainable Yield: Harvesting Only the Surplus

Definition

Maximum sustainable yield for fishing

The Maximum Sustainable Yield (MSY) is the highest possible annual catch that can be harvested indefinitely without depleting a fish population.

Maximum sustainable yield (MSY) is the largest long-term catch that can be taken from a population without reducing its ability to replenish.
It is a biological reference point for managing renewable resources like fish stocks, forests, and game.
It balances population growth against the harvest rate so the resource lasts indefinitely.

Analogy

Think of MSY like a savings account.
Withdraw only the interest (the growth) and the balance stays stable; withdraw more and the account runs down.

Relationship Between Sustainable Yield and MSY

Sustainable yield (SY) is the increase in natural capital that can be harvested without diminishing the original stock.
MSY is the highest possible sustainable yield, the maximum point before overexploitation begins.

SY = (annual growth + recruitment) − (annual death + emigration)

Example

If 1,000 fish are born each year and 200 die naturally, the sustainable yield is 800 fish per year.
Catching more than 800 would shrink the population.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Maximum Sustainable Yield: Harvesting Only the Surplus

Definition

Maximum sustainable yield for fishing

The Maximum Sustainable Yield (MSY) is the highest possible annual catch that can be harvested indefinitely without depleting a fish population.

Maximum sustainable yield (MSY) is the largest long-term catch that can be taken from a population without reducing its ability to replenish.
It is a biological reference point for managing renewable resources like fish stocks, forests, and game.
It balances population growth against the harvest rate so the resource lasts indefinitely.

Analogy

Think of MSY like a savings account.
Withdraw only the interest (the growth) and the balance stays stable; withdraw more and the account runs down.

Relationship Between Sustainable Yield and MSY

Sustainable yield (SY) is the increase in natural capital that can be harvested without diminishing the original stock.
MSY is the highest possible sustainable yield, the maximum point before overexploitation begins.

SY = (annual growth + recruitment) − (annual death + emigration)

Example

If 1,000 fish are born each year and 200 die naturally, the sustainable yield is 800 fish per year.
Catching more than 800 would shrink the population.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

IB Environmental systems and societies 4.3C Maximum Sustainable Yield Notes

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

Maximum Sustainable Yield: Harvesting Only the Surplus

Relationship Between Sustainable Yield and MSY

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Maximum Sustainable Yield: Harvesting Only the Surplus

Relationship Between Sustainable Yield and MSY

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account