Conservation of Biodiversity Notes

Conservation of Biodiversity

Importance of Biodiversity

  • Biodiversity is crucial for ecosystem resilience, human health, and overall environmental stability.
  • Various factors can reduce biodiversity, necessitating conservation efforts.

Approaches to Conservation

  • Two primary approaches:
    • Single-Species Approach: Targets individual species in danger of extinction.
    • Ecosystem Approach: Focuses on maintaining entire ecosystems, recognizing biodiversity hotspots.

Single-Species Approach

  • Emphasizes recovery efforts for one species at a time.
  • Strategies include:
    • Habitat improvement.
    • Reducing harvest levels or contaminants affecting species.
  • Captive Breeding: Example of California Condor
    • Population dropped to 22 individuals in 1987.
    • Through habitat improvements and breeding, population grew to over 400 by 2013.

Key Legislation for Single Species Conservation

  • Marine Mammal Protection Act (1972):

    • Prohibits killing marine mammals in the U.S.
    • Import/export restrictions on marine mammal parts.
    • Aims to protect species such as polar bears and sea otters.

  • Endangered Species Act (1973):

    • Protects species from extinction.
    • Authorizes the U.S. Fish and Wildlife Service to list threatened or endangered species.
    • Prohibits harming listed species or trading their parts.
    • Example: Grizzly bears in the Greater Yellowstone Ecosystem.
    • Population rose from 136 in 1975 to nearly 700 after protection measures.

Challenges and Controversies

  • The implementation of the Endangered Species Act can interfere with human activities (e.g., logging conflicts in the Pacific Northwest).
  • Ongoing debates over balancing economic interests with conservation.
  • Need for adequate funding and resources remains a significant challenge.

International Conservation Efforts

  • Convention on Biological Diversity (1992):
    • Three main objectives:
    • Conserve biodiversity.
    • Use biodiversity sustainably.
    • Share benefits from genetic resources equitably.
    • Evaluated progress in 2014; noted ongoing habitat loss and overharvesting.

Ecosystem Approach to Conservation

  • Recognizes potential sixth mass extinction due to human impact.
  • Focus on preserving entire ecosystems and their habitats.
  • Increase in designated protected areas since 1960, including terrestrial and marine habitats.
    • Example data:
    • 1960: 2% terrestrial land protected → 2010: 14.5%
    • 1960: 0.1% marine area protected → 2010: 2.4%

Considerations for Protected Areas

  • Key factors in designating protected areas:
    • Size (larger areas support more species).
    • Shape and proximity to other protected areas facilitate species movement and reduce extinction risk.
  • Theory of island biogeography applies to protected areas surrounded by human activities.

Conclusion

  • Both approaches to conservation are essential in halting biodiversity loss.
  • Ongoing evaluation and adaptation of conservation strategies are vital as ecosystems face new challenges from human activity.