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Biodiversity Chapter 13 BIODIVERSITY AND SPECIES Biodiversity Types: Genetic Diversity - Measures variety of different versions of same genes. Species Diversity - Measures number of different kinds of organisms within a community.

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Biodiversity

Chapter 13

Graphics © The McGraw-Hill Companies, Inc.


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BIODIVERSITY AND SPECIES

  • Biodiversity Types:

    • Genetic Diversity - Measures variety of different versions of same genes.

    • Species Diversity - Measures number of different kinds of organisms within a community.

    • Ecological Diversity - Measures richness and complexity of a community.

Graphics © The McGraw-Hill Companies, Inc.



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Biodiversity Abundance

Graphics © The McGraw-Hill Companies, Inc.


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BENEFITS OF BIODIVERSITY

  • Food

  • Drugs and Medicines

  • Ecological Benefits

  • Aesthetic and Cultural Benefits

Graphics © The McGraw-Hill Companies, Inc.


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THREATS TO BIODIVERSITY

  • Extinction - Elimination of a species.

Graphics © The McGraw-Hill Companies, Inc.


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Human-Caused Reductions in Biodiversity

  • Habitat Destruction

  • Hunting and Fishing

  • Commercial Products & Live Specimens

Graphics © The McGraw-Hill Companies, Inc.


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Predator and Pest Control

  • Exotic Species Introductions

    • zebra mussels

  • Diseases

    • dutch elm disease

  • Pollution

  • Genetic Assimilation

Graphics © The McGraw-Hill Companies, Inc.


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ENDANGERED SPECIES

  • COSEWIC - Committee on the Status of Endangered Wildlife in Canada

  • Ottawa, November 28, 2003 - At the first meeting of COSEWIC (Committee on the Status of Endangered Wildlife in Canada) since the passage of SARA (Species At Risk Act), the committee members reviewed the conservation status of 23 species.

    There are now 441 species in various COSEWIC risk categories, including 160 Endangered, 108 Threatened, and 140 of Special Concern. In addition, 21 species are Extirpated (no longer found in the wild in Canada), 12 are Extinct, and 32 are Data Deficient.

Graphics © The McGraw-Hill Companies, Inc.


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BIODIVERSITY PROTECTION

  • Diversity Loss in Small Populations

    • Founder Effect

    • Demographic Bottleneck

    • Genetic Drift

    • Inbreeding

  • Habitat Protection

  • International Wildlife Treaties

    • Convention on International Trade In Endangered Species (CITES)

  • Captive Breeding

    • PandaCam at Zoo Atlanta

Graphics © The McGraw-Hill Companies, Inc.


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The "Noah Question"

  • How many species can we or should we save?

  • How much are we willing to invest to protect slimy, smelly, crawly things?

  • Would you favour preserving disease organisms and parasites or should we use our limited resources to protect only beautiful, interesting or seemingly useful organisms?

Graphics © The McGraw-Hill Companies, Inc.


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