[BIO 1306] Ch57_Lecture

[BIO 1306] Ch57_Lecture - 57 Conservation Biology 57...

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57 Conservation Biology
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57 Conservation Biology 57.1 What Is Conservation Biology? 57.2 How Do Biologists Predict Changes in Biodiversity? 57.3 What Factors Threaten Species Survival? 57.4 What Strategies Do Conservation Biologists Use?
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57.1 What Is Conservation Biology? Conservation biology is an applied science, devoted to preserving the diversity of life. Conservation biology is integrated with other disciplines, using knowledge from genetics, evolution, population ecology, biogeography, wildlife management, economics, and sociology.
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57.1 What Is Conservation Biology? Conservation biology is a normative discipline; it embraces certain values and applies scientific methods to achieve goals related to those values. Conservation biologists are motivated by the belief that loss of biodiversity is negative. Although scientists are supposed to be neutral, most applied sciences are normative. The scientists must still adhere to standard scientific methods.
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57.1 What Is Conservation Biology? Conservation biology is guided by the following three principles: Evolution is the process that unites all of biology. The ecological world is dynamic. Humans are part of ecosystems.
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57.1 What Is Conservation Biology? Human beings have caused extinctions of other species for thousands of years. When humans first arrived in North America 20,000 years ago, they probably caused the extinction of large mammals such as camels, horses, mammoths, and giant sloths. A similar extinction occurred in Australia 40,000 years ago.
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Figure 57.1 Extinct Australian Megafauna
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57.1 What Is Conservation Biology? When Polynesian people settled Hawaii 2,000 years ago, they exterminated at least 39 endemic species of birds (species found nowhere else in the world).
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57.1 What Is Conservation Biology? But the current extinction situation is unique. For the first time, all major environmental changes on Earth are human induced, and we are aware of what we are doing.
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57.1 What Is Conservation Biology? Why do we value biodiversity? We depend on other species for food, fiber, and medicines. Species are necessary for the functioning of ecosystems which provide us with so many goods and services. We derive enormous aesthetic pleasure from watching and interacting with other species.
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57.1 What Is Conservation Biology? Extinctions deprive us of the opportunity for scientific study and understanding ecological interactions. Extinctions raise many ethical concerns; all species are judged to have intrinsic value.
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Scientists cannot accurately predict the number of extinctions in the coming century for four reasons: The number of species currently on Earth is unknown.
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[BIO 1306] Ch57_Lecture - 57 Conservation Biology 57...

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