IB Biology Topic C4.1.4 Capture–mark–release–recapture and the Lincoln Index Revision Notes (SL/HL)

IB Biology Topic C4.1.4 Capture–mark–release–recapture and the Lincoln Index Revision Notes (SL/HL) | RevisionDojo

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Capture-Mark-Release-Recapture Estimates Populations of Moving Animals

Motile animals such as birds, fish, insects, and mammals move constantly, so they cannot be counted in place.
Ecologists instead use the capture-mark-release-recapture (CMR) method to estimate population size.
It gives a reliable estimate from a sample and lets researchers track a species over time.

Analogy

Imagine trying to count every butterfly in a forest by eye.
They never stay still, so a direct count is hopeless.
CMR and the Lincoln index give a workable answer instead.

The Four Steps of the Method

Capture
1. Catch a first sample using traps, nets, or similar techniques.
2. Record the number caught and marked, called n1.
Mark
1. Mark each individual in a harmless, recognisable way, such as leg bands, non-toxic dye, or tags.
2. The mark must not affect survival, behaviour, or the chance of being caught again.
3. It must also last until the second capture.
Release

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Capture-Mark-Release-Recapture Estimates Populations of Moving Animals

Motile animals such as birds, fish, insects, and mammals move constantly, so they cannot be counted in place.
Ecologists instead use the capture-mark-release-recapture (CMR) method to estimate population size.
It gives a reliable estimate from a sample and lets researchers track a species over time.

Analogy

Imagine trying to count every butterfly in a forest by eye.
They never stay still, so a direct count is hopeless.
CMR and the Lincoln index give a workable answer instead.

The Four Steps of the Method

Capture
1. Catch a first sample using traps, nets, or similar techniques.
2. Record the number caught and marked, called n1.
Mark
1. Mark each individual in a harmless, recognisable way, such as leg bands, non-toxic dye, or tags.
2. The mark must not affect survival, behaviour, or the chance of being caught again.
3. It must also last until the second capture.
Release

Definition

Paywall

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

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Duis aute irure dolor in reprehenderit

Note

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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.

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C4.1.4: Capture–mark–release–recapture and the Lincoln Index Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Capture-Mark-Release-Recapture Estimates Populations of Moving Animals

The Four Steps of the Method

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Duis aute irure dolor in reprehenderit

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Capture-Mark-Release-Recapture Estimates Populations of Moving Animals

The Four Steps of the Method

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