TAILIEUCHUNG - Lecture Biology (7th edition) - Chapter 55: Conservation biology and restoration ecology

This chapter distinguish between conservation biology and restoration biology, list the three major threats to biodiversity and give an example of each, define and compare the small-population approach and the declining-population approach, distinguish between the total population size and the effective population size,. | Chapter 55 Conservation Biology and Restoration Ecology Overview: The Biodiversity Crisis Conservation biology integrates the following fields to conserve biological diversity at all levels Ecology Evolutionary biology Physiology Molecular biology Genetics Behavioral ecology Restoration ecology applies ecological principles In an effort to return degraded ecosystems to conditions as similar as possible to their natural state Tropical forests Contain some of the greatest concentrations of species Are being destroyed at an alarming rate Figure Throughout the biosphere, human activities Are altering ecosystem processes on which we and other species depend Concept : Human activities threaten Earth’s biodiversity Rates of species extinction Are difficult to determine under natural conditions The current rate of species extinction is high And is largely a result of ecosystem degradation by humans Humans are threatening Earth’s biodiversity The Three Levels of Biodiversity Biodiversity has three main components Genetic diversity Species diversity Ecosystem diversity Genetic diversity in a vole population Species diversity in a coastal redwood ecosystem Community and ecosystem diversity across the landscape of an entire region Figure Genetic Diversity Genetic diversity comprises The genetic variation within a population The genetic variation between populations Species Diversity Species diversity Is the variety of species in an ecosystem or throughout the biosphere An endangered species Is one that is in danger of becoming extinct throughout its range Threatened species Are those that are considered likely to become endangered in the foreseeable future Conservation biologists are concerned about species loss Because of a number of alarming statistics regarding extinction and biodiversity Harvard biologist E. O. Wilson has identified the Hundred Heartbeat Club Species that number fewer than 100 individuals and are only that many heartbeats from extinction (a)

• Sinh học
• Campbells Biology
• Lecture Biology
• Biological sciences
• Biological organization
• Restoration ecology
• Conservation biology
• Systems biology
• Ecosystem dynamics
• The chemical context of life
• Water molecules
• The molecular diversity of life
• Function of macromolecules
• Membrane structure
• Metabolism transforms matter
• Cellular respiration
• Chemical energy of food
• Cell communication
• The cell cycle
• Sexual life cycles
• The gene idea
• Locating genes
• The molecular basis of inheritance
• Genetic information
• Microbial model systems
• Eukaryotic genomes
• DNA technology
• The genetic basis of development
• Darwin’s theory
• The evolution of populations
• The origin of species