Chapter 3: Conservation of Endangered Species

Chapter 3: Conservation of Endangered Species

Threatened and Endangered Species

Central Question

3.1-3.5 Science

populations All the

endangered species

population ecology

genetic diversity

genes Stretches of DNA

3.1 Genetic diversity is essential to the evolution and survival of populations

VARIATION IN FACIAL MARKINGS

Genetic Diversity and Selective Breeding

IMPACT OF HEAT WAVE ON TWO FISH POPULATIONS

Genetic Diversity and Natural Selection

Think About It

3.2 Distribution and abundance are key indicators of population security

a. WIDE RANGING and EXPANDING DISTRIBUTION

c. SHRINKING DISTRIBUTION

b. LIMITED DISTRIBUTION

population density

J-shaped (exponential) population growth

Rare to Abundant

Think About It

3.3 Populations change

Rates of Reproduction

Population Growth

J- AND S-SHAPED POPULATION GROWTH

S-shaped (logistic) growth

Controls on Population Size

Think About It

3.4 The life history of a species influences its capacity to recover from disturbance

density-dependent factors

density-independentf actors

K-selected species

Think About It

r-selected species

K-SELECTED VERSUS r-SELECTED TREE SPECIES

3.5 Species interactions define biological communities

Environmental Requirements and the Niche

The Competitive Exclusion Principle

INTERACTIONS BETWEEN SPECIES IN COMMUNITIES

intraspecific competition

interspecific competition

competitive exclusion

resource partitioning

CONTRASTING APPROACHES TO DIET

COMPETITION WITHIN AND BETWEEN SPECIES

INTRASPECIFIC COMPETITION

INTERSPECIFIC COMPETITION

PARTITIONING OF RESOURCES

Think About It

3.1-3.5 Science: Summary

3.6–3.9 Issues

background extinction

3.6 Habitat destruction and alteration are the most serious threats to biodiversity

A SYMBOL OF OLD GROWTH TEMPERATE RAIN FOREST

Think About It

3.7 Invasive species threaten native species

INVASIVE COMPETITORS

Think About It

3.8 Plant and wildlife trafficking are growing dangers to species

CARVED IVORY CONFISCATED BY CUSTOMS AGENTS

Think About It

3.9 Pest and predator control have pushed species to the brink of extinction

BACK FROM THE BRINK OF EXTINCTION

Think About It

3.6–3.9 Issues: Summary

3.10-3.14 Solutions

3.10 National laws and international treaties protect endangered species

CONSERVATION SUCCESS

The CITES Treaty

Think About It

3.11 Banning of a toxin and captive breeding brought peregrine falcons back from the brink of extinction

Think About It

3.12 Population ecology provides a conceptual foundation for wolf restoration

Promoting Genetic Diversity

Logistic Population Growth in a K-selected Species

⚠ Think About It

3.13 Restoration of North American gray wolves has required working through conflict

Think About It

3.14 Wild populations are sources of significant economic benefits

Think About It

3.10-3.14 Solutions: Summary

Central Question: How can we protect species in an increasingly human-dominated world?

3.1–3.5 Science

3.6–3.9 Issues

Endangered Species and You

☐ Get involved with endangered species and wildlife conservation.

☐ Support predator-friendly products and organizations.

☐ Help control invasive species.

☐ Do not encourage wildlife trafficking.

3.10-3.14 Solutions

Answer the Central Question:

Chapter 3

Review Questions

Critical Analysis

Central Question: How can we protect Earth’s diverse ecosystems?

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