Name: saving species through population recovery
Uploaded: 2025-10-23T11:48:51.000Z
Duration: 2 min 7 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

North Carolina K-12 Science Standard Course of Study

9-12

Biology

ecosystems-interactions-energy-and-dynamics

Ecosystems- Interactions, Energy, and Dynamics

LS.Bio.5.2

Conservation of Declining Populations

The conservation of declining populations focuses on the ecological causes of the population decline. This approach preserves populations that are still large, but declining, by studying the species history and determining the reasons for decline and species needs for survival.

The rebound of the Eastern Bluebird in the United States is one successful example of this approach. Bluebirds are secondary cavity nesters, meaning they rely on natural cavities, abandoned nesting sites of other species, or artificial cavities, such as old fence posts.&#160;

Eastern Bluebird populations began to dwindle in the 1950s, reaching minimum levels in the 1960s. This decline is attributed to several factors, including pesticides and invasive, non-native species.&#160;

House sparrows, introduced in the 1950s, frequently outcompete bluebirds for nesting cavities, often with deadly consequences. These threats compounded natural pressures, such as harsh winters, predators, and competition with native species.

In the 1960s, designated trails were outfitted with nesting boxes to provide cavities for bluebirds. Scientists and volunteers monitored the boxes, removing invasive competitors and evaluating the breeding success of different nesting box configurations. &#160;

This work identified optimal features for bluebird nesting boxes that reduce the competitive advantages of non-native, invasive species. For example, an entry hole with a maximum width of 3.8 centimeters prevents disturbance by European Starlings.&#160;

These conservation efforts have helped Eastern Bluebird populations recover and actually increase in many areas. This success story demonstrates that, while human activities often contribute to species decline and endangerment, conservation efforts can help these populations recuperate.&#160;

conservation of declining populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Conservation efforts often utilize scientific approaches to identify the reasons, or the agents, causing the population to decline. This approach then devises steps to remove, oppose, or neutralize the agents.

Conservation efforts may also introduce a test group to determine the probable cause of the decline. The translocation of the remaining population to unaffected areas follows if the cause is confirmed. In cases where the remaining population is too low, or at risk of further reduction, a protected stock is bred rapidly and released to bolster the population. Subsequent monitoring confirms the success of population re-establishment.

The conservation approach has successfully restored the population of an endangered Australian bird&#8212;the Lord Howe Woodhen. These flightless birds are endemic to Lord Howe Island off the Australian coast. The population of these birds began dwindling since the beginning of human inhabitation within the island. The population had reached a state of extinction when an ornithologist, Dr. Ben Miller, identified the situation.

Methodical testing and rejection of several hypotheses identified the feral pigs as responsible for the contraction of the population size of these birds. These pigs, introduced into the island with human settlement, killed and ate the incubating birds and also destroyed their nests and eggs.

Miller&#8217;s finding resulted in the elimination of the pigs and instituting a breeding program to rear these endangered birds within an enclosed facility. The progeny from the breeding program was released into the wild in batches and monitored closely. Subsequently, the released birds started breeding, and stabilizing their population and saturating all the suitable habitat on the island.

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent ...

Education

JoVE Core

Ecology

Biodiversity and Conservation

KEY TERMS AND CONCEPTS

saving species through population recovery

Conservation of declining populations focuses on detecting a population drop, finding its cause, and stopping further loss. The goal is to prevent extinction by using scientific methods to identify the agents behind the decline. Once the cause is known, conservation teams can remove, oppose, or neutralize it.

A common step is to test possible causes with a small trial group. If the cause is confirmed, the remaining animals may be moved to an unaffected area. When the population is too small or still at risk, a protected stock is bred quickly and then released to strengthen the wild group.

Careful monitoring follows every recovery effort. This follow-up shows whether the population has been successfully re-established. The method has helped restore the endangered Lord Howe Woodhen, a flightless bird found only on Lord Howe Island off the Australian coast.

The woodhen population started to fall after humans settled on the island. By the time Dr. Ben Miller, an ornithologist, studied the birds, the population had reached the point of extinction. He used repeated tests and ruled out several ideas before finding the real cause.

Miller showed that feral pigs were responsible for the decline. These pigs had been introduced with human settlement. They killed incubating birds and destroyed nests and eggs. After the pigs were removed, a breeding program raised the birds in an enclosed facility, and the young were released in batches. The birds then began breeding in the wild, and the population stabilized across suitable habitat on the island.

Saving Species Through Population Recovery

saving-species-through-population-recovery

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Conservation of declining populations focuses on detecting a population drop, finding its cause, and stopping further loss. The goal is to prevent extinction by using scientific methods to identify the agents behind the decline. Once the cause is known, conservation teams can remove, oppose, or neutralize it. A common step is to test possible causes with a small trial group. If the cause is confirmed, the remaining animals may be moved to an unaffected area. When the population is too small or...

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key terms and concepts

Learn how scientists detect population decline, test causes, breed protected stock, and restore endangered species like the Lord Howe Woodhen.

Saving Species Through Population Recovery | JoVE K12

JoVE Core series brings biology to life through over 300 concise and easy-to-understand animated video lessons that explain key concepts in biology, plus more than 150 scientist-in-action videos that show actual research experiments conducted in today’s laboratories.

biology

Earth and Environmental Science

Earth's Systems

ESS.EES.4.4

Pennsylvania State Academic Standards

Life Science

interdependent-relationships-in-ecosystems

Interdependent Relationships in Ecosystems

3.1.9-12.N

3.1.9-12.V

Louisiana Student Standards for Science

High School

Life Sciences

Ecosystems: Interactions, Energy And Dynamics

HS-LS2-1

HS-LS2-7

Environmental Science

Environmental Awareness And Protection

HS-EVS2-1

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

Diversity And Interdependence Of Life

Loss of diversity

Tennessee Academic Standards

Biological Change: Unity and Diversity

BIO1.LS4.3

Virginia  Standards of Learning

HIgh School

BIO.8

BIO.8.d

LS.9

LS.9.a

Minnesota Academic Standards in Science

Earth and Space Science

3.2.2 9E.3.2.2.1

4.2.2 9L.4.1.1.3

Texas Essential Knowledge and Skills

Earth Systems Science

112.49.c.8.

112.49.c.8.H.

Arizona Science Standards

HS+E.E1

HS+E.E1U3.11

new-jersey-student-learning-standards-for-science

New Jersey Student Learning Standards for Science

Ecosystems: Interactions, Energy, and Dynamics

HS-LS2-2

Biological Evolution: Unity and Diversity

HS-LS4-6

Earth and Human Activity

HS-ESS3-3

engineering-technology-and-applications-of-science

Engineering, Technology and Applications of Science

Engineering Design

HS-ETS1-3

HS+B.L2

HS+B.L2U1.1

Alabama Course of Study Science

Ecosystems: Interactions Energy and Dynamics

9-12.B.2.9.a

9-12.B.2.10

9-12.EVS.4.10

Next Generation Science Standards

heredity-inheritance-and-variation-of-traits

Heredity: Inheritance and Variation of Traits

HS-ESS3-4

Florida Department of Education

SC.912.L.17

SC.912.L.17.8

SC.912.L.17.17

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Georgia Standards of Excellence

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SBO3.

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South Carolina College and Career Ready Science Standards

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B-LS2-7.

B-LS4-6.

Earth and Space Science (ESS)

E-ESS3-2.

E-ESS3-4.

new-york-state-science-learning-standards

New York State Science Learning Standards

HS-LS2-7.

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Human Sustainability

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HS-ESS3-4.

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SEV4.d

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The Water Cycle

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The Carbon Cycle

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The Nitrogen Cycle

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The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, ...

The Sulfur Cycle

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LS.Bio.4.1

What are Populations and Communities?

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Distribution and Dispersion

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Life Histories

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Energy Budgets and Reproductive Strategies

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Population Growth

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Use models to explain the relationship between the flow of energy and cycling of matter among organisms in an ecosystem.

LS.Bio.4.2

Ecological Niches

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Ecological Succession

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Keystone Species

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Symbiosis

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Competition

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Predator-Prey Interactions

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Ecological Disturbance

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Use mathematics and computational thinking to explain how interactions between organisms (predator/prey, competition) affect carrying capacity and maintain stability in an ecosystem.

LS.Bio.5.1

Analyze the relationships between matter and energy within ecosystems.

Saving Species Through Population Recovery

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