Study Notes on Wild Species and Biodiversity

Chapter 6: Wild Species and Biodiversity

The Value of Wild Species and Biodiversity

  • Ecosystem Capital: Refers to all the goods and services provided to humans by natural systems.
    • Financial Impact:
    • 2008 financial crisis led to a capital loss of $1–1.5 trillion.
    • Ecosystem degradation has resulted in a capital loss estimated at $2–4.5 trillion.
  • The foundation of ecosystem capital is based on ecosystems, which rely on wild species.
  • Ecosystem Integrity and Sustainability:
    • To maintain ecosystem sustainability, it is crucial to conserve ecosystem integrity, resilience, processes, and biodiversity.

Attitudes Toward Wildlife and Values

  • Diversity of Opinions:
    • People hold varying views on wildlife protection; consensus exists on the need for protection but diverges on methods.
    • Some advocate for wildlife protection for hunting purposes, while others oppose hunting entirely.
    • The loss of biodiversity is often seen as a tragedy, especially affecting those in developing countries who utilize wildlife for sustenance and income.
  • Reconciliation of Values:
    • Key question: How can differing values be reconciled to manage wildlife sustainably?

Biological Wealth

  • Out of an estimated 5–30 million species, two million species have been described and classified.
  • Biota: Refers to the natural species of living things.
  • Biological Wealth: Encompasses both biota and their ecosystems, forming the bulk of ecosystem capital that supports human existence.
  • Biodiversity: Defined as the richness of living species.

Historical Context of Human Interaction with Wild Species

  • Humans have utilized wild species for over 12,000 years, transforming natural landscapes into agricultural lands.
  • This has led to the extinction and displacement of numerous species as habitats were altered.
  • From 1642 to 2001, 631 North American species and subspecies were documented extinct, signifying a notable depletion of biological wealth.

Continued Dependence on Biological Wealth

  • Many individuals, particularly in developing countries, rely on natural resources for daily survival.
  • Withdrawing resources from biological wealth poses long-term sustainability issues, driven by societal perceptions and valuation of nature.

Types of Values

  • Instrumental Value:
    • Refers to the benefits derived from a species’ existence (e.g., food, shelter, income).
    • Typically anthropocentric, with human beneficiaries depending on this value for survival.
  • Intrinsic Value:
    • The inherent worth of a species regardless of its utility to humans.
    • Raises ethical questions regarding animal rights and the perception of species as property.

Value of Wildlife in Agriculture

  • Cultivated Varieties vs. Wild Populations:
    • Most food sources are derived from agriculture that lacks genetic diversity found in wild populations.
    • Wild species possess traits essential for competition with pests and resilience under adverse conditions.
  • Cultivars: Highly selected strains of wild species, which have minimal genetic variation and limited adaptability.

Utilizing Wild Genes

  • Plant breeders utilize wild relatives of cultivated crops to integrate advantageous traits through crossbreeding or biotechnology.
  • The loss of wild populations diminishes options for agricultural improvement and the potential for new food crop development.

Demand for Resources

  • The demand for wood is rising; three billion individuals rely on wood for heating and cooking.
  • Predictions suggest a looming timber famine or fuelwood crisis.
  • Forests provide valuable resources such as rubber, oils, fruits, and nuts critical for human consumption.

Banking Genetic Diversity

  • Genetic Banks:
    • Living organisms represent gene pools vital for preserving biodiversity.
    • Examples: England's Millennium Seed Bank (1 billion seeds) and Norway's Svalbard Global Seed Vault (seed backup).
    • Zoos also serve as genetic banks for endangered animal species.
  • Beyond Preservation: The emphasis is also placed on slowing down the extinction process.

Medicinal Value of Species

  • Specific plant species have contributed significantly to modern medicine:
    • Madagascar's Rosy Periwinkle: Key in treating childhood leukemia.
    • Chinese Star Anise: Essential component of Tamiflu.
    • Paclitaxel from Pacific Yew: Important for various cancer treatments.
  • Ethnobotany: This field studies the relationships between people and plants, revealing potential medicinal uses.
  • Bioprospecting: Investigating how indigenous populations utilize plants.

Recreational, Aesthetic, and Scientific Value

  • Wild species provide recreational and aesthetic enjoyment through various activities (e.g., hunting, bird-watching).
    • 2024 statistics indicated 181 million Americans engaged in outdoor recreation highlighting public concern for the environment.
  • Scientific interest in biodiversity drives research into basic natural laws and ecosystem functions, leading to practical benefits.

Commercial Interests Supported by Values

  • The economic value of recreational pursuits (e.g., wildlife-related recreation) generates significant employment and revenue.
  • Ecotourism: Involves tourism centered around observing wildlife and natural sites, crucial for developing countries yet affected by environmental degradation.

Challenges and Ethical Considerations

  • Usage of wild species raises ethical concerns:
    • Limited benefit to Madagascar from the success of the rosy periwinkle, with large corporations often profiting from traditional knowledge without compensation to indigenous communities.
    • Potential negative impacts of ecotourism (e.g., pollution, habitat disruption, cultural change).

Economic Impact of Biodiversity Loss

  • Biodiversity loss is estimated to cost $78 billion per year, disproportionately affecting the world's poorest populations.
  • Losses in biodiversity and ecosystem services are morally objectionable and have far-reaching implications.

Emphasizing Intrinsic Value

  • Distinction between instrumental and intrinsic value is critical for species protection:
    • Many species lack clear instrumental benefits but possess intrinsic worth.
    • Analogies (e.g., “destroying species is like tearing pages out of an unread book”) highlight the importance of species existence as a moral duty.

Religious and Cultural Perspectives on Biodiversity

  • Several religious traditions promote the protection of wildlife based on intrinsic value:
    • Jewish and Christian beliefs emphasize care for God's creation.
    • Islamic teachings regard the environment as a divine responsibility, and Indigenous and Hindu philosophies often embody strong environmental ethics.

Definition and Measurement of Biodiversity

  • Biodiversity includes genetic diversity within species and diversity among species, communities, and ecosystems.
  • Two primary measures for assessing biodiversity: 1) Number of species present; 2) Evenness of species distribution (lower biodiversity if dominated by one species).

Global Biodiversity Status

  • Biodiversity is declining globally, affecting endemic species particularly vulnerable to extinction.
  • Despite extensive studies in North America, many species remain poorly understood; at least 500 species have gone extinct, with one-third of species deemed vulnerable or imperiled.

Current Extinction Rate and Context

  • The current extinction rate is estimated to be 100–1,000 times greater than historical rates, with 20–25 mammal and bird species going extinct per century.
  • 23% of mammals and 12% of bird species are currently threatened.

Biodiversity in Tropical Regions

  • The tropics boast a staggering biodiversity, with unique ecosystems suffering high rates of deforestation, making species inventories incomplete.
  • Examples of biodiversity within the tropics include:
    • 43 species of ants on one tree in Peru.
    • 300 tree species within a single hectare.
    • 1,000 beetle species on a single tree species in Panama.

Root Causes for Biodiversity Decline

  • Historical extinctions stem from climate changes and catastrophic events; current biodiversity threats are encapsulated by the acronym HIPPO:
    • Habitat destruction
    • Invasive species
    • Pollution
    • Population growth
    • Overexploitation.

Biodiversity Loss in Developing Nations

  • Developing countries are likely to face heightened biodiversity losses due to high human population growth and habitat loss with growing demands for resources.

Habitat Changes Leading to Biodiversity Loss

  • Conversion: Major contributor to biodiversity loss (36%).
    • Involves changing natural landscapes to urban or agricultural uses, leading to habitat fragmentation and reduced species viability.
  • Forest cover has declined by 40%, dramatically affecting species reliant on specific habitats.

Effects of Habitat Fragmentation

  • Fragmented habitats consist of smaller, isolated patches that struggle to support stable populations, making species vulnerable to extinction.

Habitat Simplification and Intrusion

  • Simplification: Human practices that strip habitats of complexity (e.g., removing logs) affect the microhabitat, degrading the ecological integrity of ecosystems.
  • Intrusion: Human structures (e.g., telecommunication towers) pose threats to migratory species and contribute to significant avian mortality.

Invasive Species

  • Invasive Species: Non-native species that proliferate and threaten native populations through competition and predation.
    • Example: The brown tree snake in Guam led to the extinction of multiple indigenous bird species.
  • Trophic Levels: Invasive species alter energy flow and disrupt traditional food chains, thereby weakening ecosystem functions.

Pollution and Its Impacts

  • Agricultural runoff creates